New version of 1sided chapter (sent the old way, as the server at

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%%Page: 1 1
bop 75 361 a Ft(Chapter)31 b(5)75 568 y Fs(One-Sided)37 b(Comm)m(unications)
75 809 y Fr(5.1)59 b(Intro)r(duction)75 910 y Fu(Remote)11
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1080 y(This)g(mo)q(de)f(of)g(comm)o(unication)h(facilitates)h(the)e(co)q
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(access)h(or)f(up)q(date)i(at)e(other)75 1249 y(pro)q(cesses.)35
b(Ho)o(w)o(ev)o(er,)21 b(pro)q(cesses)f(ma)o(y)g(not)g(kno)o(w)f(whic)o(h)i
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(they)h(kno)o(w)f(the)g(iden)o(tit)o(y)h(of)f(these)h(pro)q(cesses.)75
1362 y(Regular)h(send/receiv)o(e)h(comm)o(unication)g(requires)f(matc)o(hing)
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(to)e(distribute)j(this)e(information.)26 b(This)18 b(requires)g(all)g(pro)q
(cesses)75 1531 y(to)c(participate)h(in)g(a)f(time)h(consuming)g(global)g
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g(up)q(on.)32 b(The)19 b(use)g(of)g(put)g(or)g(get)f(calls)i(a)o(v)o(oids)f
(the)p Fq(?)d Fp(\(Oct\))75 1644 y Fu(need)f(for)f(the)g(global)i
(computation)e(or)g(the)g(explicit)j(p)q(olling.)k(A)15 b(generic)g(example)g
(of)f(this)h(nature)f(is)75 1701 y(the)f(execution)h(of)f(an)g(assignmen)o(t)
g(of)f(the)h(form)f Fo(A)24 b(=)g(B\(map\))p Fu(,)12 b(where)h
Fo(map)g Fu(is)g(a)g(p)q(erm)o(utation)g(v)o(ector,)75 1757
y(and)i Fo(A,)24 b(B)15 b Fu(and)g Fo(map)g Fu(are)g(distributed)i(in)f(the)f
(same)g(manner.)166 1814 y(Message-passing)23 b(comm)o(unication)h(ac)o(hiev)
o(es)h(t)o(w)o(o)d(e\013ects:)36 b Fn(c)n(ommunic)n(ation)23
b Fu(of)g(data)g(from)75 1870 y(sender)f(to)f(receiv)o(er;)k(and)d
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b(The)22 b(RMA)g(design)g(sep-)75 1927 y(arates)d(these)h(t)o(w)o(o)f
(functions.)34 b(Three)21 b(comm)o(unication)f(calls)h(are)f(pro)o(vided:)30
b Fm(MPI)p 1597 1927 14 2 v 16 w(PUT)20 b Fu(\(remote)75 1983
y(write\),)d Fm(MPI)p 309 1983 V 16 w(GET)h Fu(\(remote)e(read\))h(and)h
Fm(MPI)p 896 1983 V 15 w(A)o(CCUMULA)l(TE)g Fu(\(remote)f(up)q(date\).)26
b(A)18 b(larger)f(n)o(um-)75 2039 y(b)q(er)g(of)f(sync)o(hronization)h(calls)
h(are)e(pro)o(vided,)h(to)f(supp)q(ort)g(di\013eren)o(t)h(sync)o(hronization)
g(st)o(yles.)24 b(The)75 2096 y(design)18 b(is)f(similar)h(to)e(that)g(of)g
(w)o(eakly)h(coheren)o(t)f(memory)h(systems:)22 b(correct)16
b(ordering)h(of)g(memory)75 2152 y(accesses)c(has)g(to)f(b)q(e)h(imp)q(osed)h
(b)o(y)f(the)g(user,)g(using)h(sync)o(hronization)f(calls;)i(the)e(implemen)o
(tation)h(can)75 2209 y(dela)o(y)i(comm)o(unication)g(op)q(erations)f(un)o
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(y)f(cases,)75 2322 y(of)d(fast)h(comm)o(unication)g(mec)o(hanisms)h(pro)o
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(non-)75 2378 y(coheren)o(t)f(shared)g(memory)l(,)f(DMA)g(engines,)i(hardw)o
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2435 y(cation)k(copro)q(cessors,)f(etc.)23 b(The)17 b(most)f(frequen)o(tly)h
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y(b)q(e)g(la)o(y)o(ered)g(on)g(top)f(of)g(message)g(passing.)25
b(Ho)o(w)o(ev)o(er,)15 b(supp)q(ort)i(for)f(async)o(hronous)g(comm)o
(unication)75 2548 y(agen)o(ts)k(\(handlers,)k(threads,)e(etc.\))38
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2660 y Fu(W)l(e)e(shall)h(denote)f(b)o(y)g Fl(origin)h Fu(the)f(pro)q(cess)g
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%%Page: 2 2
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(is)h(accessed.)36 b(Th)o(us,)21 b(in)h(a)e(put)g(op)q(eration,)i
(source=origin)g(and)75 106 y(destination=target;)15 b(in)h(a)f(get)g(op)q
(eration,)g(source=target)f(and)h(destination=origin.)75 249
y Fr(5.2)59 b(Initialization)75 350 y Fu(In)15 b(some)f(systems,)g
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(accessing)g(sp)q(e-)75 406 y(cially)20 b(allo)q(cated)g(memory)e(\(e.g.,)g
(memory)g(that)g(is)h(shared)g(b)o(y)g(the)f(other)h(pro)q(cesses)g(in)g(the)
g(com-)75 463 y(m)o(unicating)d(group,)e(on)h(an)g(SMP\).)f(MPI)g(pro)o
(vides)i(a)e(mec)o(hanism)i(for)e(allo)q(cating)i(and)f(freeing)h(suc)o(h)75
519 y(sp)q(ecial)h(memory)l(.)j(The)15 b(use)h(of)e(suc)o(h)i(memory)f(for)f
(RMA)i(is)f(not)g(mandatory)l(,)f(except)i(for)e(RMA)i(op-)-1992
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Fq(?)15 b Fp(\(Oct\))75 783 y Fm(MPI)p 160 783 V 16 w(MEM)p
283 783 V 16 w(ALLOC\(size,)g(comm)m(,)d(base\))117 860 y Fj(IN)155
b Fm(size)519 b Fj(size)11 b(of)e(memory)e(segmen)o(t)i(in)g(b)o(ytes)h
(\(non)g(negativ)o(e)f(in)o(teger\))-117 917 y Fq(>)15 b Fp(\(Oct\))117
992 y Fj(IN)155 b Fm(comm)466 b Fj(comm)o(unicator)13 b(for)j(group)g(where)h
(comm)o(unicati)o(on)c(is)j(ex-)-1994 b Fi(?)13 b Fp(\(Oct\))905
1048 y Fj(p)q(ected)j(to)e(o)q(ccur)h(\(handle\))117 1123 y(OUT)108
b Fm(base)505 b Fj(initial)12 b(address)j(of)f(memory)d(allo)q(cated)i(\(in)o
(teger\))75 1247 y Fo(int)23 b(MPI)p 245 1247 15 2 v 17 w(Mem)p
334 1247 V 17 w(alloc\(int)g(size,)g(MPI)p 805 1247 V 17 w(Comm)g(comm,)g
(void)g(*base\))-117 1284 y Fq(>)15 b Fp(\(Oct\))75 1334 y
Fo(MPI)p 150 1334 V 17 w(MEM)p 239 1334 V 17 w(ALLOC\()23 b(SIZE,)g(COMM,)g
(BASE,)g(IERROR\))170 1390 y(INTEGER)g(SIZE,)h(COMM,)f(IERROR)170
1447 y(INTEGER\(KIND=MPI)p 557 1447 V 15 w(ADDRESS)p 740 1447
V 17 w(SIZE\))g(BASE)75 1533 y(static)g(int)g(MPI::Mem)p 532
1533 V 17 w(alloc\(int)f(size,)h(const)h(MPI::Comm&)e(comm,)h(void*)g(base\))
-117 1569 y Fq(?)15 b Fp(\(Oct\))75 1714 y Fm(MPI)p 160 1714
14 2 v 16 w(MEM)p 283 1714 V 16 w(FREE\(base\))117 1791 y Fj(IN)155
b Fm(base)505 b Fj(initial)12 b(address)j(of)f(memory)d(segmen)o(t)i(allo)q
(cated)h(b)o(y)905 1848 y Fh(MPI)p 982 1848 13 2 v 15 w(MEM)p
1094 1848 V 15 w(MALLOC)75 1972 y Fo(static)23 b(int)g(MPI::Mem)p
532 1972 15 2 v 17 w(alloc\(int)f(size,)h(const)h(MPI::Comm&)e(comm,)h(void*)
g(base\))75 2059 y(int)g(MPI)p 245 2059 V 17 w(Mem)p 334 2059
V 17 w(free\(void)g(*base\))-117 2092 y Fq(>)15 b Fp(\(Oct\))75
2145 y Fo(MPI)p 150 2145 V 17 w(MEM)p 239 2145 V 17 w(FREE\()23
b(BASE,)g(IERROR\))170 2201 y(INTEGER\(KIND=MPI)p 557 2201
V 15 w(ADDRESS)p 740 2201 V 17 w(SIZE\))g(BASE)75 2288 y(static)g(int)g
(MPI::Mem)p 532 2288 V 17 w(free\(void)f(*base\))166 2374 y
Fu(The)16 b(F)l(ortran)e(90)h(t)o(yp)q(e)g Fh(INTEGER\(KIND)e(=)i(MPI)p
1015 2374 13 2 v 14 w(ADDRESS)p 1215 2374 V 14 w(SIZE\))h Fu(is)g(an)f
(address)h(sized)g(in)o(teger,)75 2431 y(as)11 b(describ)q(ed)j(in)e(Section)
h Fl(??)p Fu(,)e(on)h(page)f Fl(??)p Fu(.)18 b(The)12 b(functions)g(are)f
(useful,)j(in)e(F)l(ortran,)f(only)h(on)f(systems)75 2487 y(that)j(supp)q
(ort)i(\\true")e(\(C-lik)o(e,)i(Cra)o(y-lik)o(e\))f(p)q(oin)o(ters.)-1146
b Fq(?)15 b Fp(\(Oct\))189 2591 y Fn(A)n(dvic)n(e)c(to)h(users.)37
b Fu(The)10 b(comm)o(unicator)g(argumen)o(t)g(in)h(the)g(call)h(is)f(only)g
(a)f(\\p)q(erformance)g(hin)o(t":)189 2647 y(the)17 b(allo)q(cated)h(memory)e
(ma)o(y)h(b)q(e)h(used)f(for)g(comm)o(unication)h(with)f(an)o(y)g(comm)o
(unicator,)g(lik)o(e)189 2704 y(an)o(y)d(other)h(memory)l(.)1967
46 y Fp(1)1967 103 y(2)1967 159 y(3)1967 215 y(4)1967 272 y(5)1967
328 y(6)1967 385 y(7)1967 441 y(8)1967 498 y(9)1959 554 y(10)1959
611 y(11)1959 667 y(12)1959 724 y(13)1959 780 y(14)1959 836
y(15)1959 893 y(16)1959 949 y(17)1959 1006 y(18)1959 1062 y(19)1959
1119 y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959
1345 y(24)1959 1401 y(25)1959 1457 y(26)1959 1514 y(27)1959
1570 y(28)1959 1627 y(29)1959 1683 y(30)1959 1740 y(31)1959
1796 y(32)1959 1853 y(33)1959 1909 y(34)1959 1966 y(35)1959
2022 y(36)1959 2078 y(37)1959 2135 y(38)1959 2191 y(39)1959
2248 y(40)1959 2304 y(41)1959 2361 y(42)1959 2417 y(43)1959
2474 y(44)1959 2530 y(45)1959 2587 y(46)1959 2643 y(47)1959
2699 y(48)p eop
%%Page: 3 3
bop 75 -100 a Fk(5.2.)34 b(INITIALIZA)l(TION)1302 b Fu(3)189
49 y(In)17 b(the)f(C)h(binding,)h(the)f Fm(base)g Fu(argumen)o(ts)f(of)g(the)
g(calls)i Fm(MPI)p 1276 49 14 2 v 16 w(Mem)p 1390 49 V 13 w(allo)q(c)e
Fu(and)h Fm(MPI)p 1680 49 V 16 w(Mem)p 1795 49 V 13 w(free)189
106 y Fu(are)g(not)g(the)h(same)g(v)m(ariable:)26 b(a)17 b(call)i(to)e
Fm(MPI)p 1010 106 V 16 w(Mem)p 1125 106 V 13 w(allo)q(c\(&base\))i
Fu(should)f(b)q(e)h(paired)f(with)g(a)189 162 y(call)d(to)e
Fm(MPI)p 410 162 V 16 w(Mem)p 524 162 V 13 w(free\(base\))h
Fu(\(one)f(less)i(dereference\).)20 b(Both)14 b(argumen)o(ts)f(are)g
(declared)i(to)e(b)q(e)189 219 y(of)h(same)h(t)o(yp)q(e)h Fh(void*)p
Fu(,)e(so)h(as)g(to)g(facilitate)h(t)o(yp)q(e)f(casting.)20
b(\()p Fn(End)15 b(of)i(advic)n(e)f(to)h(users.)p Fu(\))189
321 y Fn(A)n(dvic)n(e)11 b(to)h(implementors.)37 b Fu(If)11
b Fm(MPI)p 824 321 V 16 w(MEM)p 947 321 V 16 w(ALLOC)g Fu(allo)q(cates)g(sp)q
(ecial)i(memory)l(,)e(then)g(a)f(design)189 378 y(similar)18
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h(b)q(e)g(used,)h(in)f(order)g(to)f(\014nd)189 434 y(out)d(the)h(size)g(of)f
(a)h(memory)f(segmen)o(t,)g(when)h(the)g(segmen)o(t)f(is)h(freed.)20
b(If)13 b(no)h(sp)q(ecial)h(memory)e(is)189 491 y(used,)i Fm(MPI)p
390 491 V 16 w(MEM)p 513 491 V 16 w(MALLOC)g Fu(simply)h(in)o(v)o(ok)o(es)f
Fm(mallo)q(c)p Fu(,)d(and)j Fm(MPI)p 1351 491 V 16 w(MEM)p
1474 491 V 16 w(FREE)h Fu(in)o(v)o(ok)o(es)f Fm(free)p Fu(.)189
565 y(A)j(call)i(to)e Fm(MPI)p 472 565 V 15 w(MEM)p 594 565
V 17 w(ALLOC)g Fu(can)h(b)q(e)g(used)g(in)g(shared)g(memory)f(systems)g(to)g
(allo)q(cate)h(the)189 622 y(windo)o(w)c(in)h(a)f(shared)g(memory)g(segmen)o
(t.)k(\()p Fn(End)d(of)g(advic)n(e)g(to)h(implementors.)p Fu(\))166
771 y Fg(Missing:)35 b Fj(Need)15 b(new)f(error)h(co)q(des.)166
922 y Fg(Discussion:)g Fj(These)h(t)o(w)o(o)d(functions)h(should)g(mo)o(v)o
(e)e(to)i(misc)e(c)o(hapter)75 1072 y Fl(Example)18 b(5.1)k
Fu(Example)17 b(of)e(use)h(of)f Fm(MPI)p 838 1072 V 16 w(MEM)p
961 1072 V 16 w(ALLOC)p Fu(,)g(in)i(F)l(ortran)d(with)i(p)q(oin)o(ter)g(supp)
q(ort.)22 b(W)l(e)75 1129 y(assume)15 b(4)g(b)o(yte)g Fh(REAL)p
Fu(s.)75 1220 y Fo(REAL)23 b(A)75 1276 y(POINTER)g(\(P,)g(A\(100,100\)\))70
b(!)24 b(no)g(memory)f(is)g(allocated)75 1333 y(CALL)g
(MPI_MEM_MALLOC\(4*100*100,)e(COMM,)i(P,)h(IERR\))695 1389
y(!)g(memory)f(is)h(allocated)1875 1434 y Fq(>)16 b Fp(\(Oct\))166
1480 y Fu(Since)h(standard)d(F)l(ortran)g(do)q(es)i(not)f(supp)q(ort)g
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(77)75 1537 y(or)f(F)l(ortran)g(90)g(co)q(de.)20 b(It)14 b(is)g(exp)q(ected)h
(that)e(most)g(\(all?\))21 b(F)l(ortran)12 b(compilers)j(o\013er)e(similar)i
(facilities.)r Fq(?)h Fp(\(Oct\))166 1639 y Fu(The)g(initialization)j(op)q
(eration)d(allo)o(ws)g(eac)o(h)g(pro)q(cess)h(to)e(sp)q(ecify)l(,)i(in)g(a)f
(collectiv)o(e)h(op)q(eration,)f(a)75 1696 y(\\memory)11 b(windo)o(w")h(that)
f(is)h(made)g(accessible)h(to)f(accesses)g(b)o(y)f(remote)h(pro)q(cesses.)19
b(The)12 b(information)75 1752 y(is)18 b(attac)o(hed)e(to)g(an)h(opaque)g(ob)
s(ject)g(returned)g(b)o(y)g(the)g(call.)27 b(This)17 b(ob)s(ject)g(represen)o
(ts)g(the)g(group)f(of)75 1809 y(pro)q(cesses)i(that)f(o)o(wn)h(and)g(access)
g(the)g(set)f(of)h(windo)o(ws,)g(and)g(the)g(attributes)g(of)f(eac)o(h)h
(windo)o(w,)g(as)75 1865 y(sp)q(eci\014ed)f(b)o(y)e(the)h(init)g(call.)75
2016 y Fm(MPI)p 160 2016 V 16 w(WIN)p 264 2016 V 16 w(INIT)e(\(base,)i(size,)
f(disp)p 682 2016 V 18 w(unit,)h(info,)e(comm)m(,)e(win\))117
2093 y Fj(IN)155 b Fm(base)505 b Fj(initial)12 b(address)j(of)f(windo)o(w)f
(\(c)o(hoice\))117 2168 y(IN)155 b Fm(size)519 b Fj(size)15
b(of)e(windo)o(w)g(in)h(b)o(ytes)g(\(nonnegativ)o(e)g(in)o(teger\))117
2242 y(IN)155 b Fm(disp)p 395 2242 V 18 w(unit)422 b Fj(lo)q(cal)17
b(unit)h(size)g(for)g(displacemen)o(ts)f(in)g(RMA)h(op)q(erations)905
2299 y(\(p)q(ositiv)o(e)c(in)o(teger\))117 2373 y(IN)155 b
Fm(info)516 b Fj(info)13 b(argumen)o(t)117 2448 y(IN)155 b
Fm(comm)466 b Fj(comm)o(unicator)11 b(\(handle\))117 2523 y(OUT)108
b Fm(win)522 b Fj(windo)o(w)13 b(ob)r(ject)i(returned)h(b)o(y)d(the)i(call)e
(\(handle\))75 2647 y Fo(int)23 b(MPI)p 245 2647 15 2 v 17
w(Win)p 334 2647 V 17 w(init\(void*)f(base,)i(int)f(size,)g(int)h(disp)p
1187 2647 V 16 w(unit,)g(MPI)p 1419 2647 V 16 w(Info)g(info,)393
2704 y(MPI)p 468 2704 V 17 w(Comm)f(comm,)g(MPI)p 819 2704
V 17 w(Win)h(*win\))-32 46 y Fp(1)-32 103 y(2)-32 159 y(3)-32
215 y(4)-32 272 y(5)-32 328 y(6)-32 385 y(7)-32 441 y(8)-32
498 y(9)-40 554 y(10)-40 611 y(11)-40 667 y(12)-40 724 y(13)-40
780 y(14)-40 836 y(15)-40 893 y(16)-40 949 y(17)-40 1006 y(18)-40
1062 y(19)-40 1119 y(20)-40 1175 y(21)-40 1232 y(22)-40 1288
y(23)-40 1345 y(24)-40 1401 y(25)-40 1457 y(26)-40 1514 y(27)-40
1570 y(28)-40 1627 y(29)-40 1683 y(30)-40 1740 y(31)-40 1796
y(32)-40 1853 y(33)-40 1909 y(34)-40 1966 y(35)-40 2022 y(36)-40
2078 y(37)-40 2135 y(38)-40 2191 y(39)-40 2248 y(40)-40 2304
y(41)-40 2361 y(42)-40 2417 y(43)-40 2474 y(44)-40 2530 y(45)-40
2587 y(46)-40 2643 y(47)-40 2699 y(48)p eop
%%Page: 4 4
bop 75 -100 a Fu(4)746 b Fk(CHAPTER)15 b(5.)35 b(ONE-SIDED)16
b(COMMUNICA)l(TIONS)75 49 y Fo(MPI)p 150 49 15 2 v 17 w(WIN)p
239 49 V 17 w(INIT\(BASE,)22 b(SIZE,)h(DISP)p 757 49 V 17 w(UNIT,)g(INFO,)g
(COMM,)g(WIN,)h(IERROR\))170 106 y(<type>)f(BASE\(*\))170 162
y(INTEGER)g(SIZE,)h(DISP)p 604 162 V 16 w(UNIT,)f(INFO,)h(COMM,)f(WIN,)g
(IERROR)-117 198 y Fq(>)15 b Fp(\(Oct\))75 249 y Fo(int)23
b(MPI::Win::init\(void)f(*base,)h(int)g(size,)g(int)h(disp)p
1248 249 V 16 w(unit,)g(const)f(MPI::Info&)393 305 y(info,)g(const)h
(MPI::Comm&)e(comm\))-117 341 y Fq(?)15 b Fp(\(Oct\))166 392
y Fu(This)20 b(is)h(a)e(collectiv)o(e)j(call)f(executed)g(b)o(y)e(all)i(pro)q
(cesses)g(in)f(the)g(group)g(of)f Fm(comm)m Fu(.)31 b(It)20
b(returns)75 448 y(a)e(windo)o(w)g(ob)s(ject)g(that)f(can)h(b)q(e)h(used)g(b)
o(y)f(these)g(pro)q(cesses)h(to)e(p)q(erform)h(RMA)g(op)q(erations.)29
b(Eac)o(h)75 504 y(pro)q(cess)21 b(sp)q(eci\014es)i(a)d(windo)o(w)h(of)g
(existing)h(memory)e(that)g(it)h(exp)q(oses)h(to)e(RMA)h(accesses)g(b)o(y)g
(the)75 561 y(pro)q(cesses)13 b(in)h(the)f(group)g(of)f Fm(comm)m
Fu(.)k(The)d(windo)o(w)h(consists)f(of)f Fm(size)h Fu(b)o(ytes,)g(starting)f

--0__=TucTGjCOn4ZqsHRcAl3Bw9NrWN7qGrf7XCYhPPuZgY9CRBXT6iq1IGCP
(at)g(address)h Fm(base)p Fu(.)75 617 y(A)i(pro)q(cess)h(ma)o(y)e(elect)i(to)
f(exp)q(ose)h(no)f(memory)f(b)o(y)h(sp)q(ecifying)j Fm(size)d(=)g(0)p
Fu(.)166 674 y(The)h(displacemen)o(t)h(unit)g(argumen)o(t)e(is)h(pro)o(vided)
g(to)f(facilitate)i(address)f(arithmetics)g(in)h(RMA)75 730
y(op)q(erations:)j(the)15 b(target)e(displacemen)o(t)j(argumen)o(t)e(of)h(an)
g(RMA)f(op)q(eration)h(is)h(scaled)f(b)o(y)g(the)g(factor)75
787 y Fm(disp)p 152 787 14 2 v 18 w(unit)h Fu(sp)q(eci\014ed)h(b)o(y)e(the)h
(target)e(pro)q(cess,)h(at)f(windo)o(w)i(creation.)-1396 b
Fq(>)15 b Fp(\(Oct\))189 893 y Fn(A)n(dvic)n(e)e(to)h(users.)38
b Fu(Common)12 b(c)o(hoices)h(for)f Fm(disp)p 1024 893 V 18
w(unit)i Fu(are)e(1)g(\(no)h(scaling\),)g(and)g Fo(sizeof\(type\))p
Fu(,)189 949 y(for)g(a)i(windo)o(w)f(that)g(consists)h(of)f(an)g(arra)o(y)f
(of)h(elemen)o(ts)h(of)f(t)o(yp)q(e)h Fo(type)p Fu(.)k(The)c(later)f(c)o
(hoice)h(will)189 1006 y(allo)o(w)h(one)g(to)g(use)h(arra)o(y)e(indices)j(in)
f(RMA)f(calls,)i(and)e(ha)o(v)o(e)g(those)g(scaled)h(correctly)g(to)e(b)o
(yte)189 1062 y(displacemen)o(ts,)h(ev)o(en)f(in)h(a)f(heterogeneous)h(en)o
(vironmen)o(t.)k(\()p Fn(End)15 b(of)i(advic)n(e)f(to)g(users.)p
Fu(\))-117 1124 y Fq(?)f Fp(\(Oct\))166 1169 y Fu(The)d Fm(info)f
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(time)g(ab)q(out)g(the)f(exp)q(ected)i(usage)75 1225 y(pattern)i(of)g(the)g
(windo)o(w.)20 b(The)15 b(follo)o(wing)h(t)o(w)o(o)e(info)i(k)o(eys)f(are)g
(de\014ned:)-1457 b Fq(>)15 b Fp(\(Oct\))75 1319 y Fl(no)p
133 1319 16 2 v 19 w(lo)q(c)o(ks)23 b Fu(If)12 b(set)g(to)g
Fh(true)p Fu(,)h(then)g(the)f(implemen)o(tation)i(ma)o(y)d(assume)h(that)g
(the)g(lo)q(cal)i(windo)o(w)e(is)h(nev)o(er)189 1375 y(lo)q(c)o(k)o(ed)18
b(\(b)o(y)e(a)h(call)i(to)d Fm(MPI)p 680 1375 14 2 v 16 w(WIN)p
784 1375 V 16 w(LOCK)p Fu(\).)g(This)i(implies)i(that)c(this)i(windo)o(w)f
(is)h(not)f(used)h(for)189 1432 y(3-part)o(y)e(comm)o(unication,)i(and)f(RMA)
g(can)g(b)q(e)h(implemen)o(ted)h(with)e(no)g(\(less\))g(async)o(hronous)189
1488 y(agen)o(t)d(activit)o(y)i(at)e(this)i(pro)q(cess.)75
1582 y Fl(no)p 133 1582 16 2 v 19 w(stores)22 b Fu(If)e(set)f(to)g
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(the)h(lo)q(cal)h(windo)o(w)e(is)189 1639 y(not)h(accessed)i(b)o(y)f(lo)q
(cal)h(stores.)37 b(This)22 b(ma)o(y)e(sa)o(v)o(e,)h(on)g(some)g(systems,)h
(explicit)h(coherence)189 1695 y(op)q(erations.)-117 1741 y
Fq(?)15 b Fp(\(Oct\))166 1789 y Fu(The)k(v)m(arious)h(pro)q(cesses)f(in)h
(the)f(group)g(of)f Fm(comm)13 b Fu(ma)o(y)18 b(sp)q(ecify)j(completely)f
(di\013eren)o(t)f(target)75 1845 y(windo)o(ws,)e(in)g(lo)q(cation,)g(size,)h
(displacemen)o(t)g(units)f(and)g(info)g(argumen)o(ts.)23 b(As)16
b(long)h(as)f(all)i(the)e(gets)75 1902 y(and)f(puts)g(to)g(a)f(particular)i
(pro)q(cess)f(\014t)g(its)g(sp)q(eci\014c)i(target)d(windo)o(w)h(this)g
(should)h(p)q(ose)g(no)f(problem.)166 1958 y(The)23 b(same)f(area)g(in)i
(memory)e(ma)o(y)g(app)q(ear)h(in)g(m)o(ultiple)i(windo)o(ws,)f(eac)o(h)f
(asso)q(ciated)g(with)75 2015 y(a)d(di\013eren)o(t)g(comm)o(unicator.)34
b(Ho)o(w)o(ev)o(er,)19 b(concurren)o(t)h(comm)o(unications)h(to)e(distinct,)j
(o)o(v)o(erlapping)75 2071 y(windo)o(ws)15 b(ma)o(y)g(lead)h(to)e(erroneous)h
(results.)166 2128 y(The)g(information)g(ab)q(out)g(the)g(lo)q(cal)h(windo)o
(w)g(asso)q(ciated)f(with)g Fm(win)h Fu(is)f(cac)o(hed)h(with)f(the)g(newly)
75 2184 y(created)g(windo)o(w)h(ob)s(ject,)e(and)h(is)h(attac)o(hed)f(to)f
(the)h(follo)o(wing)h(three)g(attributes.)75 2290 y Fl(MPI)p
184 2290 V 18 w(WINDO)o(W)p 449 2290 V 19 w(BASE:)22 b Fu(Initial)17
b(address)e(of)g(lo)q(cal)h(address)75 2384 y Fl(MPI)p 184
2384 V 18 w(WINDO)o(W)p 449 2384 V 19 w(SIZE:)22 b Fu(size)16
b(of)f(lo)q(cal)h(windo)o(w,)f(in)h(b)o(ytes)75 2478 y Fl(MPI)p
184 2478 V 18 w(WINDO)o(W)p 449 2478 V 19 w(DISP)p 593 2478
V 18 w(UNIT:)23 b Fu(displacemen)o(t)16 b(unit)g(used)g(for)f(lo)q(cal)h
(windo)o(w)166 2584 y(If)k(a)f(windo)o(w)i(ob)s(ject)e Fm(win)h
Fu(w)o(as)f(created)h(b)o(y)g(a)f(call)i(to)e Fm(MPI)p 1255
2584 14 2 v 16 w(WIN)p 1359 2584 V 16 w(INIT\(base,)i(size,)g(disp)p
1774 2584 V 17 w(unit,)75 2641 y Ff(:)8 b(:)g(:)e Fm(\))p Fu(,)18
b(then)h Fm(MPI)p 377 2641 V 16 w(HANDLE)p 572 2641 V 17 w(A)l(TTR)p
706 2641 V 17 w(GET\(win,)g(MPI)p 1008 2641 V 16 w(WINDO)o(W)p
1220 2641 V 16 w(BASE,)g(val,)g(\015ag,)g(MPI)p 1649 2641 V
16 w(WIN)f(\))g Fu(will)75 2697 y(return)d Fm(val)g(=)g(base)p
Fu(;)h(and)g(similarly)l(,)g(for)f(the)g(other)g(t)o(w)o(o.)1967
46 y Fp(1)1967 103 y(2)1967 159 y(3)1967 215 y(4)1967 272 y(5)1967
328 y(6)1967 385 y(7)1967 441 y(8)1967 498 y(9)1959 554 y(10)1959
611 y(11)1959 667 y(12)1959 724 y(13)1959 780 y(14)1959 836
y(15)1959 893 y(16)1959 949 y(17)1959 1006 y(18)1959 1062 y(19)1959
1119 y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959
1345 y(24)1959 1401 y(25)1959 1457 y(26)1959 1514 y(27)1959
1570 y(28)1959 1627 y(29)1959 1683 y(30)1959 1740 y(31)1959
1796 y(32)1959 1853 y(33)1959 1909 y(34)1959 1966 y(35)1959
2022 y(36)1959 2078 y(37)1959 2135 y(38)1959 2191 y(39)1959
2248 y(40)1959 2304 y(41)1959 2361 y(42)1959 2417 y(43)1959
2474 y(44)1959 2530 y(45)1959 2587 y(46)1959 2643 y(47)1959
2699 y(48)p eop
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367 y Fm(MPI)p 274 367 14 2 v 15 w(MEM)p 396 367 V 16 w(ALLOC)f
Fu(will)h(b)q(e)f(b)q(etter.)42 b(Suc)o(h)23 b(\\go)q(o)q(d")f(windo)o(w)h
(for)f(RMA)g(comm)o(unication)189 424 y(is)c(created)g(b)o(y)g(\014rst)g
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424 V 16 w(MEM)p 1425 424 V 16 w(ALLOC)p Fu(,)g(next)g(creating)189
480 y(an)d(RMA)g(windo)o(w)h(in)g(the)f(memory)f(allo)q(cated)j(with)e
Fm(MPI)p 1230 480 V 16 w(WIN)p 1334 480 V 16 w(INIT)p Fu(.)189
554 y(Also,)g(on)g(some)g(systems,)g(p)q(erformance)g(is)h(impro)o(v)o(ed)g
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y(or)f(double-w)o(ord)i(aligned.)22 b(\()p Fn(End)15 b(of)i(advic)n(e)f(to)g
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(mec)o(hanisms)189 769 y(in)d(di\013eren)o(t)f(memory)g(areas)f(\(e.g.,)g
(load/store)h(in)h(a)f(shared)g(memory)g(segmen)o(t,)f(and)i(an)f(asyn-)189
825 y(c)o(hronous)d(handler)j(in)e(priv)m(ate)h(memory\),)f(the)g
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w(ALLOC)p Fu(,)f(or)g(b)o(y)g(other,)i(implemen)o(tation)189
994 y(sp)q(eci\014c,)16 b(mec)o(hanisms,)e(together)g(with)g(information)g
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1051 y(cated.)k(When)13 b(a)e(call)i(to)e Fm(MPI)p 707 1051
V 16 w(WIN)p 811 1051 V 16 w(INIT)g Fu(o)q(ccurs,)i(then)f(MPI)g(c)o(hec)o
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(and)g(decide,)i(accordingly)l(,)f(whic)o(h)g(mec)o(hanism)g(to)e(use)i(for)f
(RMA)g(op)q(erations.)189 1182 y(V)l(endors)d(ma)o(y)f(pro)o(vide)i
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(w)i(\\go)q(o)q(d")189 1238 y(memory)h(to)h(b)q(e)h(used)f(for)g(static)g(v)m
(ariables.)21 b(\()p Fn(End)16 b(of)g(advic)n(e)g(to)h(implementors.)p
Fu(\))75 1434 y Fm(MPI)p 160 1434 V 16 w(WIN)p 264 1434 V 16
w(FREE\(win\))117 1511 y Fj(INOUT)62 b Fm(win)522 b Fj(windo)o(w)13
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15 2 v 17 w(Win)p 334 1636 V 17 w(free\(MPI)p 543 1636 V 16
w(Win)h(*win\))75 1722 y(MPI)p 150 1722 V 17 w(WIN)p 239 1722
V 17 w(FREE\(WIN,)e(IERROR\))170 1779 y(INTEGER)h(WIN,)h(IERROR)1875
1815 y Fq(>)16 b Fp(\(Oct\))75 1865 y Fo(int)23 b(MPI::Win::free\(void\))166
1951 y Fu(F)l(rees)f(the)h(windo)o(w)g(ob)s(ject)f Fm(win)h
Fu(and)f(returns)h(a)f(n)o(ull)i(handle.)43 b(The)23 b(usual)g(ob)s(ject)f
(freeing)75 2008 y(seman)o(tics)e(are)g(used:)30 b(the)20 b(ob)s(ject)f
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(the)75 2121 y(call.)1720 b Fq(?)16 b Fp(\(Oct\))75 2263 y
Fr(5.3)59 b(Communication)17 b(Calls)75 2365 y Fu(MPI)i(supp)q(orts)g(three)g
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2 v 16 w(PUT)19 b Fu(transfers)g(data)f(from)h(the)g(caller)75
2421 y(memory)e(\(origin\))h(to)f(the)h(target)f(memory;)h
Fm(MPI)p 973 2421 V 16 w(GET)g Fu(transfers)f(data)g(from)g(the)h(target)f
(memory)75 2478 y(to)j(the)g(caller)i(memory;)g(and)f Fm(MPI)p
721 2478 V 16 w(A)o(CCUMULA)l(TE)g Fu(up)q(dates)f(lo)q(cations)i(in)f(the)f
(target)g(memory)l(,)75 2534 y(e.g.)32 b(b)o(y)19 b(adding)i(to)d(these)i(lo)
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b(These)20 b(op)q(erations)75 2591 y(are)h Fn(nonblo)n(cking)p
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f(ma)o(y)h(con)o(tin)o(ue)g(after)g(the)75 2647 y(call)i(returns.)41
b(The)23 b(transfer)f(is)g(completed,)j(b)q(oth)d(at)g(the)g(origin)i(and)e
(at)g(the)g(target,)g(when)h(a)75 2704 y(subsequen)o(t)g Fn(synchr)n
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(v)o(olv)o(ed)h(windo)o(w)f(ob)s(ject.)-32 46 y Fp(1)-32 103
y(2)-32 159 y(3)-32 215 y(4)-32 272 y(5)-32 328 y(6)-32 385
y(7)-32 441 y(8)-32 498 y(9)-40 554 y(10)-40 611 y(11)-40 667
y(12)-40 724 y(13)-40 780 y(14)-40 836 y(15)-40 893 y(16)-40
949 y(17)-40 1006 y(18)-40 1062 y(19)-40 1119 y(20)-40 1175
y(21)-40 1232 y(22)-40 1288 y(23)-40 1345 y(24)-40 1401 y(25)-40
1457 y(26)-40 1514 y(27)-40 1570 y(28)-40 1627 y(29)-40 1683
y(30)-40 1740 y(31)-40 1796 y(32)-40 1853 y(33)-40 1909 y(34)-40
1966 y(35)-40 2022 y(36)-40 2078 y(37)-40 2135 y(38)-40 2191
y(39)-40 2248 y(40)-40 2304 y(41)-40 2361 y(42)-40 2417 y(43)-40
2474 y(44)-40 2530 y(45)-40 2587 y(46)-40 2643 y(47)-40 2699
y(48)p eop
%%Page: 6 6
bop 75 -100 a Fu(6)746 b Fk(CHAPTER)15 b(5.)35 b(ONE-SIDED)16
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b(lo)q(cal)h(comm)o(unication)75 106 y(bu\013er)20 b(of)g(an)h(RMA)f(call)i
(should)f(not)f(b)q(e)h(accessed,)h(or)e(used)h(as)f(the)h(source)f(or)g
(target)f(of)h(other)75 162 y(comm)o(unications,)d(after)e(the)i(RMA)f(call,)
h(un)o(til)h(the)e(subsequen)o(t)h(sync)o(hronization)g(call)h(completes,)75
219 y(with)e(one)f(exception:)21 b(The)15 b(origin)h(bu\013ers)f(of)g
(concurren)o(t)g(put)h(or)e(accum)o(ulate)i(calls)g(ma)o(y)f(o)o(v)o(erlap.)
189 325 y Fn(R)n(ationale.)58 b Fu(The)18 b(rule)h(ab)q(o)o(v)o(e)f(is)h
(more)e(lenien)o(t)j(than)e(for)g(message)g(passing,)h(where)f(w)o(e)g(do)189
381 y(not)g(allo)o(w)h(t)o(w)o(o)e(concurren)o(t)i(sends,)g(with)g(o)o(v)o
(erlapping)g(send)h(bu\013ers.)30 b(Here,)19 b(w)o(e)f(allo)o(w)h(t)o(w)o(o)
189 438 y(concurren)o(t)c(puts)g(with)h(o)o(v)o(erlapping)g(send)f
(bu\013ers.)20 b(The)c(reasons)e(for)h(this)g(relaxation)h(are)231
532 y(1.)22 b(Users)14 b(do)g(not)g(lik)o(e)i(that)d(restriction,)i(whic)o(h)
g(is)g(not)f(v)o(ery)g(natural)h(\(it)f(prohibits)h(concur-)289
588 y(ren)o(t)f(reads\).)-117 608 y Fq(>)h Fp(\(Oct\))231 661
y Fu(2.)22 b(W)l(eak)o(ening)13 b(the)g(rule)h(do)q(es)f(not)f(prev)o(en)o(t)
h(e\016cien)o(t)g(implemen)o(tation,)h(as)f(far)f(as)g(w)o(e)h(kno)o(w.)-117
718 y Fq(?)i Fp(\(Oct\))231 791 y Fu(3.)22 b(W)l(eak)o(ening)15
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(e)g(w)o(an)o(t)f(to)g(asso)q(ciate)289 847 y(one)g(sync)o(hronization)i
(call)f(with)g(as)f(man)o(y)g(RMA)h(op)q(erations)f(is)h(p)q(ossible.)21
b(If)15 b(puts)g(from)289 904 y(o)o(v)o(erlapping)j(bu\013ers)g(cannot)f(b)q
(e)h(concurren)o(t,)g(than)g(w)o(e)f(need)i(to)e(needlessly)j(add)e(syn-)289
960 y(c)o(hronization)e(p)q(oin)o(ts)f(in)h(the)g(co)q(de.)189
1054 y(\()p Fn(End)f(of)i(r)n(ationale.)p Fu(\))166 1207 y
Fg(Discussion:)f Fj(Do)d(w)o(e)h(ha)o(v)o(e)g(a)g(problem)e(with)i(a)g(load)f
(that)h(accesses)i(the)f(origin)e(bu\013er)i(of)e(a)h(put,)f(while)75
1264 y(the)h(put)h(runs?)166 1367 y Fu(The)c(calls)h(use)f(general)h(datat)o
(yp)q(e)e(argumen)o(ts)g(to)g(sp)q(ecify)j(comm)o(unication)e(bu\013ers)g(at)
f(the)h(origin)75 1424 y(and)i(at)e(the)i(target.)18 b(Th)o(us,)12
b(a)g(transfer)g(op)q(eration)h(ma)o(y)e(also)i(gather)f(data)f(at)h(the)h
(source)f(and)h(scatter)75 1480 y(it)19 b(at)f(the)g(destination.)31
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o(unication)g(bu\013ers)f(are)75 1537 y(pro)o(vided)e(b)o(y)f(the)g(caller.)
166 1593 y(F)l(or)h(all)i(three)f(calls,)i(the)e(target)f(pro)q(cess)h(ma)o
(y)f(b)q(e)i(iden)o(tical)h(with)e(the)g(origin)h(pro)q(cess;)g(i.e.,)f(a)75
1650 y(pro)q(cess)e(ma)o(y)g(use)g(a)g(put)h(call)g(to)f(mo)o(v)o(e)f(data)h
(in)h(its)f(memory)l(.)189 1756 y Fn(R)n(ationale.)39 b Fu(The)14
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g(as)f(for)g(message)189 1812 y(passing.)22 b(It)16 b(simpli\014es)i(some)e
(co)q(ding,)g(and)g(is)h(v)o(ery)e(useful)i(with)f(accum)o(ulate)h(op)q
(erations,)f(to)189 1869 y(allo)o(w)f(atomic)g(up)q(dates)h(of)f(lo)q(cal)h
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1991 y Fe(5.3.1)49 b(Put)75 2076 y Fu(The)15 b(execution)g(of)f(a)g(put)h(op)
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(the)h(origin)g(pro)q(cess)75 2133 y(and)f(a)g(matc)o(hing)g(receiv)o(e)h(b)o
(y)g(the)f(target)f(pro)q(cess.)19 b(The)c(ob)o(vious)f(di\013erence)i(is)e
(that)g(all)h(parameters)75 2189 y(are)g(pro)o(vided)h(b)o(y)f(one)g(call)i
({)e(the)g(call)h(executed)g(b)o(y)f(the)h(origin)g(pro)q(cess.)1967
46 y Fp(1)1967 103 y(2)1967 159 y(3)1967 215 y(4)1967 272 y(5)1967
328 y(6)1967 385 y(7)1967 441 y(8)1967 498 y(9)1959 554 y(10)1959
611 y(11)1959 667 y(12)1959 724 y(13)1959 780 y(14)1959 836
y(15)1959 893 y(16)1959 949 y(17)1959 1006 y(18)1959 1062 y(19)1959
1119 y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959
1345 y(24)1959 1401 y(25)1959 1457 y(26)1959 1514 y(27)1959
1570 y(28)1959 1627 y(29)1959 1683 y(30)1959 1740 y(31)1959
1796 y(32)1959 1853 y(33)1959 1909 y(34)1959 1966 y(35)1959
2022 y(36)1959 2078 y(37)1959 2135 y(38)1959 2191 y(39)1959
2248 y(40)1959 2304 y(41)1959 2361 y(42)1959 2417 y(43)1959
2474 y(44)1959 2530 y(45)1959 2587 y(46)1959 2643 y(47)1959
2699 y(48)p eop
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b Fu(7)75 49 y Fm(MPI)p 160 49 14 2 v 16 w(PUT\()11 b(o)o(rigin)p
402 49 V 15 w(addr,)h(o)o(rigin)p 632 49 V 15 w(count,)h(o)o(rigin)p
884 49 V 15 w(datat)o(yp)q(e,)g(ta)o(rget)p 1200 49 V 16 w(rank,)f(ta)o(rget)
p 1436 49 V 16 w(disp,)g(ta)o(rget)p 1663 49 V 17 w(count,)g(ta)o(r-)75
106 y(get)p 137 106 V 17 w(datat)o(yp)q(e,)k(win\))117 183
y Fj(IN)155 b Fm(o)o(rigin)p 427 183 V 16 w(addr)381 b Fj(address)15
b(of)f(origin)e(bu\013er)j(\(c)o(hoice\))117 258 y(IN)155 b
Fm(o)o(rigin)p 427 258 V 16 w(count)360 b Fj(n)o(um)o(b)q(er)13
b(of)h(elemen)o(ts)f(sen)o(t)i(\(in)o(teger\))117 333 y(IN)155
b Fm(o)o(rigin)p 427 333 V 16 w(datat)o(yp)q(e)302 b Fj(datat)o(yp)q(e)14
b(of)g(elemen)o(ts)f(sen)o(t)i(\(handle\))117 408 y(IN)155
b Fm(ta)o(rget)p 433 408 V 17 w(rank)375 b Fj(rank)14 b(of)f(target)i(\(in)o
(teger\))117 483 y(IN)155 b Fm(ta)o(rget)p 433 483 V 17 w(disp)384
b Fj(displacemen)o(t)20 b(from)f(start)i(of)f(windo)o(w)g(to)h(target)g
(bu\013er)905 540 y(\(nonnegativ)o(e)14 b(in)o(teger\))117
615 y(IN)155 b Fm(ta)o(rget)p 433 615 V 17 w(count)353 b Fj(n)o(um)o(b)q(er)
13 b(of)h(elemen)o(ts)f(receiv)o(ed)j(\(in)o(teger\))117 690
y(IN)155 b Fm(ta)o(rget)p 433 690 V 17 w(datat)o(yp)q(e)295
b Fj(datat)o(yp)q(e)14 b(used)h(at)f(the)g(target)h(\(handle\))117
765 y(IN)155 b Fm(win)522 b Fj(windo)o(w)13 b(ob)r(ject)i(used)g(for)e(comm)o
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15 2 v 17 w(Put\()h(void)f(*origin)p 669 890 V 16 w(addr,)g(int)h(origin)p
1068 890 V 16 w(count,)f(MPI)p 1323 890 V 17 w(Datatype)393
946 y(origin)p 540 946 V 17 w(datatype,)f(int)i(target)p 1035
946 V 16 w(rank,)f(int)h(target)p 1434 946 V 16 w(disp,)f(int)393
1003 y(target)p 540 1003 V 17 w(count,)g(MPI)p 796 1003 V 16
w(Datatype)g(target)p 1171 1003 V 16 w(datatype,)g(MPI)p 1498
1003 V 17 w(Win)g(win\))75 1089 y(MPI)p 150 1089 V 17 w(PUT\()g(ORIGIN)p
430 1089 V 16 w(ADDR,)h(ORIGIN)p 734 1089 V 16 w(COUNT,)f(ORIGIN)p
1061 1089 V 16 w(DATATYPE,)g(TARGET)p 1460 1089 V 16 w(RANK,)393
1146 y(TARGET)p 540 1146 V 17 w(DISP,)g(TARGET)p 844 1146 V
16 w(COUNT,)g(TARGET)p 1171 1146 V 16 w(DATATYPE,)g(WIN,)g(IERROR\))170
1202 y(<type>)g(ORIGIN)p 484 1202 V 17 w(ADDR\(*\))170 1259
y(INTEGER)g(ORIGIN)p 508 1259 V 17 w(COUNT,)g(ORIGIN)p 836
1259 V 16 w(DATATYPE,)g(TARGET)p 1235 1259 V 16 w(RANK,)g(TARGET)p
1538 1259 V 17 w(DISP,)170 1315 y(TARGET)p 317 1315 V 17 w(COUNT,)g(TARGET)p
645 1315 V 16 w(DATATYPE,)g(WIN,)g(IERROR)1875 1351 y Fq(>)16
b Fp(\(Oct\))75 1401 y Fo(int)23 b(MPI::Win::Put\(void)f(*origin)p
795 1401 V 16 w(addr,)h(int)h(origin)p 1194 1401 V 16 w(count,)f(const)g
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p 1035 1458 V 16 w(rank,)f(int)h(target)p 1434 1458 V 16 w(disp,)f(int)393
1514 y(target)p 540 1514 V 17 w(count,)g(const)g(MPI::Datatype&)f(target)p
1369 1514 V 16 w(datatype\))1875 1554 y Fq(?)16 b Fp(\(Oct\))166
1601 y Fu(T)l(ransfers)k Fm(o)o(rigin)p 478 1601 14 2 v 16
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Fu(,)75 1657 y(starting)13 b(at)h(address)g Fm(o)o(rigin)p
568 1657 V 15 w(addr)g Fu(on)g(the)g(origin)h(no)q(de)f(to)g(the)g(target)f
(no)q(de)h(sp)q(eci\014ed)i(b)o(y)e(the)g Fm(comm)m Fu(,)75
1714 y Fm(ta)o(rget)p 190 1714 V 16 w(rank)19 b Fu(pair.)31
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(address)h Fm(ta)o(rget)p 1624 1714 V 16 w(addr)g(=)g(win-)75
1770 y(do)o(w)p 154 1770 V 16 w(base)c(+)e(ta)o(rget)p 427
1770 V 16 w(disp)p Fq(\002)p Fm(disp)p 626 1770 V 20 w(unit)p
Fu(,)h(where)f Fm(windo)o(w)p 1016 1770 V 17 w(base)h Fu(and)g
Fm(disp)p 1290 1770 V 17 w(unit)h Fu(are)e(the)g(base)g(address)h(and)75
1827 y(windo)o(w)h(displacemen)o(t)i(unit)f(sp)q(eci\014ed)h(at)e(windo)o(w)g
(initialization,)j(b)o(y)d(the)h(target)e(pro)q(cess.)166 1883
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f Fm(ta)o(rget)p 1230 1883 V 17 w(count)i Fu(and)f Fm(ta)o(rget)p
1568 1883 V 17 w(datat)o(yp)q(e)p Fu(.)117 b Fq(>)16 b Fp(\(Oct\))166
1940 y Fu(The)h(data)g(transfer)f(is)i(the)f(same)g(that)g(w)o(ould)g(o)q
(ccur)h(if)g(the)f(origin)h(pro)q(cess)f(executed)h(a)f(send)75
1996 y(op)q(eration)g(with)g(argumen)o(ts)f Fm(o)o(rigin)p
717 1996 V 15 w(addr,)h(o)o(rigin)p 952 1996 V 15 w(count,)h(o)o(rigin)p
1209 1996 V 15 w(datat)o(yp)q(e,)h(ta)o(rget)p 1531 1996 V
16 w(rank,)e(tag,)f(comm)m Fu(,)75 2052 y(and)11 b(the)f(target)g(pro)q(cess)
h(executed)g(a)f(receiv)o(e)i(op)q(eration)f(with)f(argumen)o(ts)g
Fm(ta)o(rget)p 1506 2052 V 16 w(addr,)i(ta)o(rget)p 1743 2052
V 16 w(count,)75 2109 y(ta)o(rget)p 190 2109 V 16 w(datat)o(yp)q(e,)k
(source,)f(tag,)g(comm)m Fu(,)d(where)j Fm(ta)o(rget)p 1020
2109 V 16 w(addr)g Fu(is)g(the)g(target)f(bu\013er)h(address)g(computed)75
2165 y(as)h(explained)j(ab)q(o)o(v)o(e,)d(and)h Fm(comm)11
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(\014t)g(in)i(the)e(target)f(windo)o(w.)24 b(A)75 2278 y(high-qualit)o(y)13
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(de\014ned)h(at)e(the)h(origin)75 2448 y(pro)q(cess.)j(Ho)o(w)o(ev)o(er,)15
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272 y(5)-32 328 y(6)-32 385 y(7)-32 441 y(8)-32 498 y(9)-40
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(that)g(is)189 106 y(de\014ned)j(at)f(the)g(origin)h(pro)q(cess,)g(ev)o(en)f
(though)g(it)h(de\014nes)g(a)f(data)g(la)o(y)o(out)f(in)i(the)g(target)e(pro)
q(cess)189 162 y(memory)l(.)18 b(This)11 b(causes)f(no)h(problems)g(in)g(a)g
(homogeneous)f(en)o(vironmen)o(t,)h(or)f(in)i(a)e(heterogenous)189
219 y(en)o(vironmen)o(t,)k(if)g(only)h(p)q(ortable)f(datat)o(yp)q(es)g(are)f
(used.)20 b(A)14 b(datat)o(yp)q(e)g(is)g Fn(p)n(ortable)p Fu(,)g(if)h(it)f
(is)g(basic)189 275 y(datat)o(yp)q(e,)f(or)g(it)h(is)g(deriv)o(ed)h(using)f
(only)h(the)e(t)o(yp)q(e)h(constructors)f Fm(MPI)p 1426 275
V 16 w(TYPE)p 1559 275 V 17 w(CONTIGUOUS,)189 332 y(MPI)p 274
332 V 15 w(TYPE)p 406 332 V 17 w(VECTOR)f Fu(and)e Fm(MPI)p
779 332 V 16 w(TYPE)p 912 332 V 17 w(INDEXED)p Fu(.)f(Suc)o(h)i(datat)o(yp)q
(e)f(is)h(p)q(ortable,)g(b)q(ecause)g(all)189 388 y(displacemen)o(ts)k(in)h
(suc)o(h)e(datat)o(yp)q(e)g(are)g(in)i(terms)d(of)h(exten)o(ts)g(of)g(basic)h
(datat)o(yp)q(es.)k(Therefore,)189 444 y(if)e(suc)o(h)g(datat)o(yp)q(e)g
(\014ts)g(a)f(data)h(la)o(y)o(out)f(in)i(one)f(memory)l(,)g(it)g(will)i
(\014t)e(the)g(corresp)q(onding)h(data)189 501 y(la)o(y)o(out)12
b(in)i(another)f(memory)l(,)g(if)h(the)f(same)g(declarations)h(w)o(ere)f
(used,)h(ev)o(en)g(if)f(the)h(t)o(w)o(o)d(systems)189 557 y(ha)o(v)o(e)18
b(di\013eren)o(t)i(arc)o(hitectures.)31 b(On)20 b(the)f(other)g(hand,)h(if)f
(a)g(datat)o(yp)q(e)f(w)o(as)h(constructed)g(us-)189 614 y(ing)d
Fm(MPI)p 350 614 V 16 w(TYPE)p 483 614 V 17 w(HINDEXED,)g(MPI)p
838 614 V 16 w(TYPE)p 971 614 V 17 w(HVECTOR)h Fu(or)f Fm(MPI)p
1355 614 V 16 w(TYPE)p 1488 614 V 17 w(STRUCT)p Fu(,)g(then)h(the)189
670 y(datat)o(yp)q(e)12 b(con)o(tains)h(explicit)i(b)o(yte)e(displacemen)o
(ts.)20 b(These)14 b(displacemen)o(ts)g(are)f(unlik)o(ely)i(to)d(b)q(e)189
727 y(c)o(hosen)j(correctly)h(if)g(they)f(\014t)g(data)g(la)o(y)o(out)g(on)g
(one)g(memory)l(,)g(but)g(are)g(used)h(for)f(data)g(la)o(y)o(outs)189
783 y(on)g(another)g(pro)q(cess,)g(running)h(on)f(a)g(pro)q(cessor)g(with)g
(a)g(di\013eren)o(t)h(arc)o(hitecture.)k(In)c(the)f(later)189
840 y(case,)e(one)h(should)h(use)f(the)g(mec)o(hanisms)g(de\014ned)i(in)e
(MPI)g(for)f(transferring)h(datat)o(yp)q(es)f(across)189 896
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(can)h(b)q(e)g(signi\014can)o(tly)i(a\013ected,)e(on)g(some)g(systems,)189
1028 y(from)f(the)i(c)o(hoice)g(of)f(windo)o(w)h(lo)q(cation)g(and)g(the)f
(shap)q(e)h(and)g(lo)q(cation)g(of)f(the)h(origin)g(and)189
1084 y(target)c(bu\013er:)28 b(transfers)19 b(from)g(memory)g(allo)q(cated)h
(b)o(y)f Fm(MPI)p 1315 1084 V 16 w(MEM)p 1438 1084 V 16 w(ALLOC)h
Fu(will)h(b)q(e)f(m)o(uc)o(h)189 1141 y(faster)f(on)g(systems)h(where)g(some)
f(memory)g(is)h(shared;)i(transfers)d(from)g(con)o(tiguous)h(bu\013ers)189
1197 y(will)15 b(b)q(e)f(faster)f(on)g(most,)g(if)h(not)f(all,)h(systems;)f
(the)h(alignmen)o(t)g(of)f(the)h(comm)o(unication)g(bu\013ers)189
1253 y(ma)o(y)g(also)h(impact)h(p)q(erformance.)k(\()p Fn(End)15
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(implementors.)38 b Fu(A)13 b(high)h(qualit)o(y)g(implemen)o(tation)g(will)h
(prev)o(en)o(t)e(remote)g(accesses)189 1416 y(to)21 b(memory)g(outside)i(the)
e(windo)o(w)h(that)g(w)o(as)f(exp)q(osed)h(b)o(y)g(the)g(pro)q(cess.)40
b(This,)24 b(b)q(oth)e(for)189 1473 y(debugging)15 b(purp)q(oses,)f(and)g
(for)f(protection)h(with)h(clien)o(t-serv)o(er)g(co)q(des)f(that)g(use)g
(RMA.)g(I.e.,)f(a)189 1529 y(high-qualit)o(y)k(implemen)o(tation)h(will)g(c)o
(hec)o(k)e(windo)o(w)g(b)q(ounds)i(on)e(eac)o(h)g(RMA)g(call,)h(and)g(raise)
189 1586 y(an)d(MPI)h(exception)h(at)e(the)g(origin)i(call,)f(if)g(an)g
(out-of-b)q(ound)g(situation)g(o)q(ccurred.)20 b(Note)15 b(that)189
1642 y(the)g(condition)h(can)g(b)q(e)g(c)o(hec)o(k)o(ed)f(at)g(the)g(origin.)
21 b(\()p Fn(End)15 b(of)i(advic)n(e)f(to)g(implementors.)p
Fu(\))1967 46 y Fp(1)1967 103 y(2)1967 159 y(3)1967 215 y(4)1967
272 y(5)1967 328 y(6)1967 385 y(7)1967 441 y(8)1967 498 y(9)1959
554 y(10)1959 611 y(11)1959 667 y(12)1959 724 y(13)1959 780
y(14)1959 836 y(15)1959 893 y(16)1959 949 y(17)1959 1006 y(18)1959
1062 y(19)1959 1119 y(20)1959 1175 y(21)1959 1232 y(22)1959
1288 y(23)1959 1345 y(24)1959 1401 y(25)1959 1457 y(26)1959
1514 y(27)1959 1570 y(28)1959 1627 y(29)1959 1683 y(30)1959
1740 y(31)1959 1796 y(32)1959 1853 y(33)1959 1909 y(34)1959
1966 y(35)1959 2022 y(36)1959 2078 y(37)1959 2135 y(38)1959
2191 y(39)1959 2248 y(40)1959 2304 y(41)1959 2361 y(42)1959
2417 y(43)1959 2474 y(44)1959 2530 y(45)1959 2587 y(46)1959
2643 y(47)1959 2699 y(48)p eop
%%Page: 9 9
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630 230 V 15 w(count,)h(o)o(rigin)p 882 230 V 15 w(datat)o(yp)q(e,)h(ta)o
(rget)p 1199 230 V 16 w(rank,)e(ta)o(rget)p 1435 230 V 16 w(disp,)h(ta)o
(rget)p 1663 230 V 16 w(count,)g(ta)o(r-)75 286 y(get)p 137
286 V 17 w(datat)o(yp)q(e,)j(win\))117 363 y Fj(OUT)108 b Fm(o)o(rigin)p
427 363 V 16 w(addr)381 b Fj(address)15 b(of)f(origin)e(bu\013er)j(\(c)o
(hoice\))117 438 y(IN)155 b Fm(o)o(rigin)p 427 438 V 16 w(count)360
b Fj(n)o(um)o(b)q(er)13 b(of)h(elemen)o(ts)f(receiv)o(ed)j(\(in)o(teger\))117
512 y(IN)155 b Fm(o)o(rigin)p 427 512 V 16 w(datat)o(yp)q(e)302
b Fj(datat)o(yp)q(e)14 b(of)g(elemen)o(ts)f(receiv)o(ed)j(\(handle\))117
586 y(IN)155 b Fm(ta)o(rget)p 433 586 V 17 w(rank)375 b Fj(rank)14
b(of)f(target)i(\(in)o(teger\))117 660 y(IN)155 b Fm(ta)o(rget)p
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(to)f(target)i(bu\013er)f(\(non-)905 717 y(negativ)o(e)i(in)o(teger\))117
791 y(IN)155 b Fm(ta)o(rget)p 433 791 V 17 w(count)353 b Fj(n)o(um)o(b)q(er)
13 b(of)h(elemen)o(ts)f(sen)o(t)i(\(in)o(teger\))117 866 y(IN)155
b Fm(ta)o(rget)p 433 866 V 17 w(datat)o(yp)q(e)295 b Fj(datat)o(yp)q(e)14
b(of)g(elemen)o(ts)f(sen)o(t)i(\(handle\))117 940 y(IN)155
b Fm(win)522 b Fj(windo)o(w)13 b(ob)r(ject)i(used)g(for)e(comm)o(unication)e
(\(handle\))75 1064 y Fo(int)23 b(MPI)p 245 1064 15 2 v 17
w(get\()h(void)f(*origin)p 669 1064 V 16 w(addr,)g(int)h(origin)p
1068 1064 V 16 w(count,)f(MPI)p 1323 1064 V 17 w(Datatype)393
1121 y(origin)p 540 1121 V 17 w(datatype,)f(int)i(target,)f(int)g(target)p
1321 1121 V 16 w(disp,)h(int)393 1177 y(target)p 540 1177 V
17 w(count,)f(MPI)p 796 1177 V 16 w(Datatype)g(target)p 1171
1177 V 16 w(datatype,)g(MPI)p 1498 1177 V 17 w(Win)g(win\))75
1264 y(MPI)p 150 1264 V 17 w(GET\()g(ORIGIN)p 430 1264 V 16
w(ADDR,)h(ORIGIN)p 734 1264 V 16 w(COUNT,)f(ORIGIN)p 1061 1264
V 16 w(DATATYPE,)g(TARGET,)g(TARGET)p 1651 1264 V 16 w(DISP,)393
1320 y(TARGET)p 540 1320 V 17 w(COUNT,)g(TARGET)p 868 1320
V 16 w(DATATYPE,)g(WIN,)g(IERROR\))170 1377 y(<type>)g(ORIGIN)p
484 1377 V 17 w(ADDR\(*\))170 1433 y(INTEGER)g(ORIGIN)p 508
1433 V 17 w(COUNT,)g(ORIGIN)p 836 1433 V 16 w(DATATYPE,)g(TARGET,)g(TARGET)p
1426 1433 V 16 w(DISP,)170 1489 y(TARGET)p 317 1489 V 17 w(COUNT,)g(TARGET)p
645 1489 V 16 w(DATATYPE,)g(WIN,)g(IERROR)1875 1526 y Fq(>)16
b Fp(\(Oct\))75 1576 y Fo(int)23 b(MPI::Win::Get\(void)f(*origin)p
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(MPI::Datatype&)393 1632 y(origin)p 540 1632 V 17 w(datatype,)f(int)i(target)
p 1035 1632 V 16 w(rank,)f(int)h(target)p 1434 1632 V 16 w(disp,)f(int)393
1689 y(target)p 540 1689 V 17 w(count,)g(const)g(MPI::Datatype&)f(target)p
1369 1689 V 16 w(datatype\))1875 1729 y Fq(?)16 b Fp(\(Oct\))166
1775 y Fu(Similar)j(to)e Fm(MPI)p 468 1775 14 2 v 15 w(PUT)p
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(bu\013er.)75 1945 y(A)f(high)g(qualit)o(y)h(implemen)o(tation)g(will)g
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75 2001 y(is)h(violated.)75 2122 y Fe(5.3.3)49 b(Examples)75
2208 y Fl(Example)18 b(5.2)k Fu(W)l(e)f(sho)o(w)e(ho)o(w)h(to)g(implemen)o(t)
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2321 y(assume)f(a)g(blo)q(c)o(k)h(distribution)h(with)e(equal)h(size)g(blo)q
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(p\))75 2478 y(INTEGER)g(m,)g(map\(m\),)g(comm,)h(p)75 2534
y(REAL)f(A\(m\),)g(B\(m\))75 2647 y(INTEGER)g(otypes\(p\),)f(oindex\(m\),)94
b(!)24 b(used)g(to)f(construct)g(origin)g(datatypes)266 2704
y(tytpes\(p\),)f(tindex\(m\),)94 b(!)24 b(used)g(to)f(construct)g(target)g
(datatypes)-32 46 y Fp(1)-32 103 y(2)-32 159 y(3)-32 215 y(4)-32

--0__=TucTGjCOn4ZqsHRcAl3Bw9NrWN7qGrf7XCYhPPuZgY9CRBXT6iq1IGCP
272 y(5)-32 328 y(6)-32 385 y(7)-32 441 y(8)-32 498 y(9)-40
554 y(10)-40 611 y(11)-40 667 y(12)-40 724 y(13)-40 780 y(14)-40
836 y(15)-40 893 y(16)-40 949 y(17)-40 1006 y(18)-40 1062 y(19)-40
1119 y(20)-40 1175 y(21)-40 1232 y(22)-40 1288 y(23)-40 1345
y(24)-40 1401 y(25)-40 1457 y(26)-40 1514 y(27)-40 1570 y(28)-40
1627 y(29)-40 1683 y(30)-40 1740 y(31)-40 1796 y(32)-40 1853
y(33)-40 1909 y(34)-40 1966 y(35)-40 2022 y(36)-40 2078 y(37)-40
2135 y(38)-40 2191 y(39)-40 2248 y(40)-40 2304 y(41)-40 2361
y(42)-40 2417 y(43)-40 2474 y(44)-40 2530 y(45)-40 2587 y(46)-40
2643 y(47)-40 2699 y(48)p eop
%%Page: 10 10
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1404 y(DO)g(i=1,m)147 1461 y(j)f(=)h(map\(i\)/m)147 1517 y(count\(j\))e(=)i
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1743 y(DO)h(i=2,p)147 1799 y(total\(i\))e(=)i(total\(i-1\))f(+)g
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2251 y(DO)h(i=1,m)147 2307 y(j)f(=)h(map\(i\)/m)147 2364 y(k)f(=)h
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2703 y(!)h(create)f(origin)g(and)g(target)g(datatypes)g(for)g(each)h(get)f
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498 y(9)1959 554 y(10)1959 611 y(11)1959 667 y(12)1959 724
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1006 y(18)1959 1062 y(19)1959 1119 y(20)1959 1175 y(21)1959
1232 y(22)1959 1288 y(23)1959 1345 y(24)1959 1401 y(25)1959
1457 y(26)1959 1514 y(27)1959 1570 y(28)1959 1627 y(29)1959
1683 y(30)1959 1740 y(31)1959 1796 y(32)1959 1853 y(33)1959
1909 y(34)1959 1966 y(35)1959 2022 y(36)1959 2078 y(37)1959
2135 y(38)1959 2191 y(39)1959 2248 y(40)1959 2304 y(41)1959
2361 y(42)1959 2417 y(43)1959 2474 y(44)1959 2530 y(45)1959
2587 y(46)1959 2643 y(47)1959 2699 y(48)p eop
%%Page: 11 11
bop 75 -100 a Fk(5.3.)34 b(COMMUNICA)l(TION)16 b(CALLS)1068
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332 y(MPI_REAL,)g(ttype\(i\),)f(ierr\))147 388 y(CALL)h
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614 y(CALL)g(MPI_WIN_BARRIER\(win,)e(ierr\))75 670 y(DO)j(i=1,p)147
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328 y(6)-32 385 y(7)-32 441 y(8)-32 498 y(9)-40 554 y(10)-40
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%%Page: 12 12
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1737 1427 V 17 w(disp,)393 1484 y(int)h(target)p 636 1484 V
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1484 V 16 w(datatype,)g(MPI)p 1594 1484 V 16 w(Op)h(op,)393
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844 1683 V 16 w(COUNT,)g(TARGET)p 1171 1683 V 16 w(DATATYPE,)g(OP,)h(WIN,)f
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1796 y(INTEGER)g(ORIGIN)p 508 1796 V 17 w(COUNT,)g(ORIGIN)p
836 1796 V 16 w(DATATYPE,)g(TARGET)p 1235 1796 V 16 w(RANK,)g(TARGET)p
1538 1796 V 17 w(DISP,)170 1853 y(TARGET)p 317 1853 V 17 w(DATATYPE,)f(OP,)i
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p 898 1996 V 16 w(datatype,)h(int)h(target)p 1393 1996 V 16
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939 2052 V 17 w(count,)g(const)g(MPI::Datatype&)393 2108 y(target)p
540 2108 V 17 w(datatype,)f(const)h(MPI::Op&)g(op\))-117 2149
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2308 y(at)j(o\013set)g Fm(ta)o(rget)p 377 2308 V 16 w(disp)p
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2699 y(48)p eop
%%Page: 13 13
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1559 y(c)o(hronization)e(b)q(et)o(w)o(een)h(start)d(and)i(p)q(ost)g(m)o(ust)f
(\015o)o(w)h(from)f(origin)h(to)g(target;)f(and)h(races)g(ma)o(y)189
1615 y(o)q(ccur)g(if)g(the)g(comm)o(unication)g(pattern)g(c)o(hanges.)24
b(Whenev)o(er)17 b(suc)o(h)h(c)o(hange)e(o)q(ccurs,)i(the)e(old)189
1672 y(set)g(of)f(pro)q(cesses)i(that)e(accesses)i(a)e(windo)o(w)i(is)f(no)o
(w)g(required)h(to)f(sync)o(hronize)h(with)f(the)h(new)189
1728 y(set)f(of)h(pro)q(cesses)h(that)e(access)h(that)g(same)f(windo)o(w.)26
b(This)18 b(sync)o(hronization)g(either)f(in)o(v)o(olv)o(es)189
1785 y(a)e(global)h(barrier,)f(or)g(requires)h(to)f(solv)o(e)h(the)f(same)g
(\\in)o(v)o(erse)h(problem")g(that)f(w)o(e)g(w)o(ere)g(trying)189
1841 y(to)e(a)o(v)o(oid)h(in)i(the)e(\014rst)g(hand:)20 b(iden)o(tifying,)c
(for)d(eac)o(h)i(target,)e(the)h(set)g(of)g(origin)h(pro)q(cesses)g(that)189
1898 y(access)h(that)g(target.)24 b(The)17 b(adv)m(an)o(tages)f(of)g(the)h
(more)f(limited)i(v)o(ersion)f(are)g(limited.)26 b(\()p Fn(End)17
b(of)189 1954 y(r)n(ationale.)p Fu(\))189 2049 y Fn(A)n(dvic)n(e)e(to)i
(implementors.)39 b Fu(W)l(e)16 b(outline)g(t)o(w)o(o)e(p)q(ossible)j
(implemen)o(tations:)189 2122 y(\\Push")c(proto)q(col:)19 b(the)13
b(call)h(to)f Fm(MPI)p 838 2122 14 2 v 16 w(WIN)p 942 2122
V 16 w(POST\(count,)i(ranks,)f(\015ag,)f(win\))g Fu(causes)g(a)g(message)189
2178 y(to)j(b)q(e)i(sen)o(t)e(to)h(eac)o(h)g(origin)g(pro)q(cess)h(listed)g
(in)g Fm(ranks)f Fu(\(unless)h Fm(\015ag)f(=)g(no)q(check)p
Fu(\).)27 b(This)17 b(signal)189 2235 y(allo)o(ws)i(RMA)f(comm)o(unication)i
(to)e(o)q(ccur.)31 b(The)19 b(origin)g(pro)q(cesses)h(signal)f(bac)o(k)g
(completion)189 2291 y(when)k(their)f(call)i(to)e Fm(MPI)p
669 2291 V 16 w(WIN)p 773 2291 V 16 w(COMPLETE)g Fu(o)q(ccur)h(\(the)f(later)
h(message)f(ma)o(y)f(b)q(e)j(piggy-)189 2348 y(bac)o(k)o(ed)15
b(on)g(data\).)189 2421 y(\\Pull")h(proto)q(col:)j(the)d(call)g(to)e
Fm(MPI)p 828 2421 V 16 w(WIN)p 932 2421 V 16 w(POST\(count,)j(ranks,)e
(\015ag,)g(win\))g Fu(causes)g(the)g(target)189 2478 y(windo)o(w)g(to)g(b)q
(e)h(mark)o(ed)f(p)q(osted)h(at)e(the)i(target.)j(The)d(mark)f(could)h(b)q(e)
g(the)g(list)g Fm(ranks)p Fu(,)f(or)g(just)189 2534 y(the)j(in)o(teger)h
Fm(count)g Fu(\(the)g(later)f(pro)o(vide)h(less)g(error-c)o(hec)o(king\).)30
b(The)18 b(RMA)h(calls)g(from)f(eac)o(h)189 2591 y(origin)g(pro)q(cess)h(ha)o
(v)o(e)e(to)g(b)q(e)i(preceded)g(b)o(y)f(a)g(test)f(of)h(the)g(p)q(osted)g
(mark.)27 b(This)19 b(can)f(imply)h(a)189 2647 y(full)f(handshak)o(e,)f
(preceding)i(the)e(RMA)g(data)g(transfer;)g(or,)f(if)i(RMA)f(accesses)g(are)g
(executed)189 2704 y(b)o(y)e(an)g(agen)o(t)g(at)g(the)g(target,)f(and)i
(bu\013ering)g(is)g(acceptable,)g(an)f(eager)g(proto)q(col)h(can)f(b)q(e)h
(used)-32 46 y Fp(1)-32 103 y(2)-32 159 y(3)-32 215 y(4)-32
272 y(5)-32 328 y(6)-32 385 y(7)-32 441 y(8)-32 498 y(9)-40
554 y(10)-40 611 y(11)-40 667 y(12)-40 724 y(13)-40 780 y(14)-40
836 y(15)-40 893 y(16)-40 949 y(17)-40 1006 y(18)-40 1062 y(19)-40
1119 y(20)-40 1175 y(21)-40 1232 y(22)-40 1288 y(23)-40 1345
y(24)-40 1401 y(25)-40 1457 y(26)-40 1514 y(27)-40 1570 y(28)-40
1627 y(29)-40 1683 y(30)-40 1740 y(31)-40 1796 y(32)-40 1853
y(33)-40 1909 y(34)-40 1966 y(35)-40 2022 y(36)-40 2078 y(37)-40
2135 y(38)-40 2191 y(39)-40 2248 y(40)-40 2304 y(41)-40 2361
y(42)-40 2417 y(43)-40 2474 y(44)-40 2530 y(45)-40 2587 y(46)-40
2643 y(47)-40 2699 y(48)p eop
%%Page: 22 22
bop 75 -100 a Fu(22)728 b Fk(CHAPTER)15 b(5.)30 b(ONE-SIDED)16
b(COMMUNICA)l(TIONS)189 49 y Fu(whereb)o(y)i(RMA)h(data)f(is)h(sen)o(t)g(and)
f(the)h(test)f(o)q(ccurs)h(at)f(the)h(target)e(\(this)i(is)g(similar)h(to)e
(the)189 106 y(short)d(and)h(long)g(send)h(proto)q(cols\).)k(The)16
b(complete)h(call)g(undo)f(the)g(mark)g(\(deletes)g(the)g(origin)189
162 y(en)o(try)l(,)g(if)g(a)g(list)h(is)g(used;)g(decreases)f(the)h(coun)o
(ter,)e(if)i(a)f(coun)o(ter)g(is)h(used\).)23 b(\()p Fn(End)16
b(of)i(advic)n(e)f(to)189 219 y(implementors.)p Fu(\))75 340
y Fe(5.4.2)49 b(Ba)o(rrier)75 521 y Fm(MPI)p 160 521 14 2 v
16 w(WIN)p 264 521 V 16 w(BARRIER\(\015ag,)16 b(win\))117 598
y Fj(IN)155 b Fm(\015ag)518 b Fj(\015ag)14 b(argumen)o(t)e(\(in)o(teger\))117
673 y(IN)155 b Fm(win)522 b Fj(windo)o(w)13 b(ob)r(ject)i(\(handle\))75
797 y Fo(int)23 b(MPI)p 245 797 15 2 v 17 w(Win)p 334 797 V
17 w(barrier\()g(int)g(flag,)g(MPI)p 876 797 V 17 w(Win)h(win\))75
884 y(MPI)p 150 884 V 17 w(WIN)p 239 884 V 17 w(BARRIER\(FLAG,)e(WIN,)h
(IERROR\))170 940 y(INTEGER)g(FLAG,)h(WIN,)f(IERROR)-117 977
y Fq(>)15 b Fp(\(Oct\))75 1027 y Fo(int)23 b(MPI::Win::barrier\(int)e(flag\))
-117 1067 y Fq(?)15 b Fp(\(Oct\))166 1113 y Fu(The)h(MPI)h(call)g
Fm(MPI)p 535 1113 14 2 v 16 w(WIN)p 639 1113 V 16 w(BARRIER\(\015ag,)g(win\))
f Fu(sync)o(hronizes)h(RMA)g(calls)g(on)f Fm(win)p Fu(.)23
b(The)17 b(call)75 1170 y(is)g(collectiv)o(e)g(on)f(the)h(group)e(of)h
Fm(win)p Fu(.)23 b(All)17 b(RMA)f(op)q(erations)h(on)f Fm(win)g
Fu(that)f(w)o(ere)h(started)g(b)q(efore)g(the)75 1226 y(barrier)i(call)i
(will)f(b)q(e)g(completed)g(at)f(their)h(origin)f(b)q(efore)h(the)f(barrier)h
(call)g(returns)f(at)f(the)i(origin.)75 1283 y(They)e(will)h(b)q(e)f
(completed)g(at)f(their)h(target)e(b)q(efore)i(the)f(barrier)h(call)g
(returns)f(at)g(the)h(target.)22 b(RMA)75 1339 y(op)q(erations)13
b(on)h Fm(win)f Fu(started)g(b)o(y)g(a)g(pro)q(cess)g(after)g(the)g(barrier)g
(call)i(returned)e(will)i(access)e(their)h(target)75 1396 y(windo)o(w)h(only)
h(after)f(the)g(barrier)g(call)i(returned)e(on)g(the)h(target.)166
1452 y(The)f Fm(\015ag)g Fu(argumen)o(t)g(has)g(one)g(of)g(three)g(v)m
(alues:)75 1546 y Fl(MPI)p 184 1546 16 2 v 18 w(STR)o(ONG)23
b Fu(The)17 b(call)g(to)f Fm(MPI)p 767 1546 14 2 v 16 w(WIN)p
871 1546 V 16 w(BARRIER)i Fu(b)q(eha)o(v)o(es)e(as)g(a)g(\\true")g(barrier:)
22 b(no)17 b(pro)q(cess)189 1602 y(exits)e(the)g(barrier)h(un)o(til)g(all)g
(pro)q(cesses)g(in)g(the)f(group)g(of)g Fm(win)g Fu(reac)o(hed)h(the)f
(barrier.)75 1696 y Fl(MPI)p 184 1696 16 2 v 18 w(WEAK)23 b
Fu(The)17 b(call)i(sync)o(hronizes)f(RMA)g(calls)h(on)e Fm(win)p
Fu(,)h(as)f(explained)j(ab)q(o)o(v)o(e.)26 b(Ho)o(w)o(ev)o(er,)17
b(it)189 1753 y(need)d(not)f(act)g(as)g(a)g(true)g(barrier)h(with)f(resp)q
(ect)h(to)f(other)g(op)q(erations)h(\(lo)q(cal)g(accesses)f(or)g(other)189
1809 y(MPI)i(calls\).)-526 b Fq(>)15 b Fp(\(Oct\))75 1903 y
Fl(MPI)p 184 1903 V 18 w(NOCHECK)23 b Fu(The)16 b(call)h(enforces)e(correct)h
(termination)g(of)f(previously)j(started)d(MPI)g(calls,)189
1959 y(but)g(do)q(es)g(not)g(dela)o(y)h(RMA)f(calls)i(issued)f(after)e(the)i
(barrier.)-1384 b Fq(?)15 b Fp(\(Oct\))166 2053 y Fu(All)h(pro)q(cesses)g
(pro)o(vide)g(the)f(same)g Fm(\015ag)g Fu(v)m(alue.)-1106 b
Fq(>)15 b Fp(\(Oct\))166 2110 y Fu(Consider)23 b(an)g(RMA)g(comm)o(unication)
h(phase)f(where)g(pro)q(cess)h Fo(i)e Fu(accesses)i(windo)o(ws)f(at)f(the)75
2166 y Fo(tocounts[i])d Fu(pro)q(cesses)i(listed)h(in)f(the)g(arra)o(y)f
Fo(toranks[i])p Fu(,)g(and)h(the)f(windo)o(w)h(at)f(pro)q(cess)h
Fo(i)f Fu(is)75 2222 y(accessed)15 b(b)o(y)f(the)h Fo(fromcount[i])d
Fu(pro)q(cesses)j(listed)h(in)f(the)f(arra)o(y)f Fo(fromranks[i])p
Fu(.)18 b(Then,)d(the)f(co)q(de)75 2279 y(fragmen)o(t)75 2373
y Fo(MPI_Win_barrier\(flag1,win\))o(;)75 2429 y(for\(i=0;)23
b(i<)g(tocount[myrank];)f(i++\))123 2486 y(MPI_Put\(...,dest[i],...,)o
(win\);)75 2542 y(MPI_Win_barrier\(flag2,win\))o(;)75 2636
y Fu(is)16 b(equiv)m(alen)o(t)h(to)d(the)h(follo)o(wing)h(co)q(de)1967
46 y Fp(1)1967 103 y(2)1967 159 y(3)1967 215 y(4)1967 272 y(5)1967
328 y(6)1967 385 y(7)1967 441 y(8)1967 498 y(9)1959 554 y(10)1959
611 y(11)1959 667 y(12)1959 724 y(13)1959 780 y(14)1959 836
y(15)1959 893 y(16)1959 949 y(17)1959 1006 y(18)1959 1062 y(19)1959
1119 y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959
1345 y(24)1959 1401 y(25)1959 1457 y(26)1959 1514 y(27)1959
1570 y(28)1959 1627 y(29)1959 1683 y(30)1959 1740 y(31)1959
1796 y(32)1959 1853 y(33)1959 1909 y(34)1959 1966 y(35)1959
2022 y(36)1959 2078 y(37)1959 2135 y(38)1959 2191 y(39)1959
2248 y(40)1959 2304 y(41)1959 2361 y(42)1959 2417 y(43)1959
2474 y(44)1959 2530 y(45)1959 2587 y(46)1959 2643 y(47)1959
2699 y(48)p eop
%%Page: 23 23
bop 75 -100 a Fk(5.4.)34 b(SYNCHR)o(ONIZA)l(TION)17 b(CALLS)1031
b Fu(23)75 49 y Fo(MPI_Win_post\(fromcount[myr)o(ank],)21 b
(fromranks[myrank],)g(flag1,)i(win\);)75 106 y(MPI_Win_start\(tocount[myra)o
(nk],)e(toranks[myrank],)g(flag1,)i(win\);)75 162 y(for\(i=0;)g(i<)g
(tocount[myrank];)f(i++\))123 219 y(MPI_Put\(...,dest[i],...,)o(win\);)75
275 y(MPI_Win_complete\(win\);)75 332 y(MPI_Win_wait\(win\);)1875
375 y Fq(?)16 b Fp(\(Oct\))75 490 y Fe(5.4.3)49 b(Lo)q(ck)75
671 y Fm(MPI)p 160 671 14 2 v 16 w(WIN)p 264 671 V 16 w(LOCK\(lo)q(ck)p
494 671 V 16 w(t)o(yp)q(e,)16 b(rank,)f(\015ag,)f(win\))117
748 y Fj(IN)155 b Fm(lo)q(ck)p 398 748 V 17 w(t)o(yp)q(e)413
b Fj(either)10 b Fh(MPI)p 1095 748 13 2 v 15 w(LOCK)p 1219
748 V 14 w(EX)o(CLUSIVE)d Fj(or)i Fh(MPI)p 1579 748 V 15 w(LOCK)p
1703 748 V 14 w(SHARED)117 823 y Fj(IN)155 b Fm(rank)504 b
Fj(rank)14 b(of)f(lo)q(c)o(k)o(ed)h(windo)o(w)f(\(in)o(teger\))117
898 y(IN)155 b Fm(\015ag)518 b Fj(\015ag)14 b(argumen)o(t)e(\(in)o(t\))117
973 y(IN)155 b Fm(win)522 b Fj(windo)o(w)13 b(ob)r(ject)i(\(handle\))75
1097 y Fo(int)23 b(MPI)p 245 1097 15 2 v 17 w(Win)p 334 1097
V 17 w(lock\(int)g(lock)p 662 1097 V 16 w(type,)h(int)f(rank,)g(int)h(flag,)f
(MPI)p 1371 1097 V 17 w(Win)g(win\))75 1184 y(MPI)p 150 1184
V 17 w(WIN)p 239 1184 V 17 w(LOCK\()g(LOCK)p 495 1184 V 16
w(TYPE,)h(RANK,)f(FLAG,)g(WIN,)g(IERROR\))170 1240 y(INTEGER)g(RANK,)h(LOCK)p
604 1240 V 16 w(TYPE,)f(RANK,)h(FLAG,)f(WIN,)g(IERROR)1875
1277 y Fq(>)16 b Fp(\(Oct\))75 1327 y Fo(int)23 b(MPI::Win::lock\(int)f(lock)
p 723 1327 V 16 w(type,)i(int)f(rank,)g(int)h(flag\))1875 1367
y Fq(?)16 b Fp(\(Oct\))166 1413 y Fu(Starts)i(a)h(sequence)h(of)e(RMA)i
(accesses)f(to)f(the)h(windo)o(w)h(asso)q(ciated)f(with)g Fm(\(win,)h(rank\))
p Fu(.)31 b(The)75 1470 y(call)17 b(also)e(ensures)h(that)f(an)o(y)h(RMA)f
(access)h(to)f(the)h(windo)o(w)f(asso)q(ciated)h(with)g Fm(\(win,)g(rank\))f
Fu(that)g(w)o(as)75 1526 y(protected)i(b)o(y)h(a)f(previously)i(released,)f
(con\015icting)h(lo)q(c)o(k)f(will)i(ha)o(v)o(e)d(completed)h(at)f(the)g
(target.)26 b(As)75 1583 y(for,)12 b Fm(MPI)p 240 1583 14 2
v 16 w(ST)l(ART)h(\015ag)f Fu(can)g(ha)o(v)o(e)g(the)g(three)h(v)m(alues)g
Fh(MPI)p 1069 1583 13 2 v 14 w(STRONG,)e(MPI)p 1347 1583 V
14 w(WEAK)h Fu(and)g Fh(MPI)p 1654 1583 V 14 w(NOCHECK)p Fu(.)75
1639 y(If)k Fm(\015ag)f(=)g(MPI)p 340 1639 14 2 v 16 w(STRONG)p
Fu(,)h(then)g(the)f(lo)q(c)o(k)h(call)g(blo)q(c)o(ks)g(un)o(til)h(the)e(lo)q
(c)o(k)h(is)g(actually)g(acquired.)21 b(If)15 b Fm(\015ag)75
1696 y(=)k(MPI)p 214 1696 V 15 w(WEAK)g Fu(then)f(the)h(call)g(to)f
Fm(MPI)p 795 1696 V 16 w(WIN)p 899 1696 V 16 w(LOCK)g Fu(ma)o(y)f(return,)i
(ev)o(en)g(if)f(the)h(target)e(windo)o(w)h(is)75 1752 y(lo)q(c)o(k)o(ed.)24
b(Ho)o(w)o(ev)o(er,)15 b(the)i(actual)f(RMA)h(data)f(transfer)f(will)j(b)q(e)
f(dela)o(y)o(ed)h(un)o(til)f(the)g(lo)q(c)o(k)f(is)h(acquired.)75
1808 y(If)d Fm(\015ag)g(=)g(MPI)p 336 1808 V 16 w(NOCHECK)p
Fu(,)g(then)g(no)g(lo)q(c)o(k)h(need)g(b)q(e)f(acquired.)21
b(It)14 b(is)g(up)g(to)g(the)g(user)g(to)f(ensure)i(that)75
1865 y(no)g(con\015icting)i(lo)q(c)o(k)f(is)f(held)i(or)d(acquired)j
(concurren)o(tly)l(.)189 1971 y Fn(A)n(dvic)n(e)22 b(to)i(implementors.)88
b Fu(The)23 b(\015ag)g(argumen)o(t)f(ma)o(y)h(b)q(e)h(ignored)f(b)o(y)h
(implemen)o(tors;)189 2027 y(it)c(is)h(alw)o(a)o(ys)e(correct)h(\(alb)q(eit,)
i(ine\016cien)o(t\))f(to)f(implemen)o(t)h Fm(MPI)p 1363 2027
V 16 w(WIN)p 1467 2027 V 16 w(ST)l(ART)g Fu(as)f(if)h Fm(\015ag)f(=)189
2084 y(MPI)p 274 2084 V 15 w(STRONG)p Fu(.)d(\()p Fn(End)e(of)i(advic)n(e)f
(to)g(implementors.)p Fu(\))75 2284 y Fm(MPI)p 160 2284 V 16
w(WIN)p 264 2284 V 16 w(UNLOCK\()f(rank,)g(win\))117 2361 y
Fj(IN)155 b Fm(rank)504 b Fj(rank)14 b(of)f(windo)o(w)g(\(in)o(teger\))117
2436 y(IN)155 b Fm(win)522 b Fj(windo)o(w)13 b(ob)r(ject)i(\(handle\))75
2561 y Fo(int)23 b(MPI)p 245 2561 15 2 v 17 w(Win)p 334 2561
V 17 w(unlock\(int)f(rank,)i(MPI)p 829 2561 V 16 w(Win)g(win\))75
2647 y(MPI)p 150 2647 V 17 w(WIN)p 239 2647 V 17 w(UNLOCK\(RANK,)e(WIN,)h
(IERROR\))170 2704 y(INTEGER)g(RANK,)h(WIN,)f(IERROR)-32 46
y Fp(1)-32 103 y(2)-32 159 y(3)-32 215 y(4)-32 272 y(5)-32
328 y(6)-32 385 y(7)-32 441 y(8)-32 498 y(9)-40 554 y(10)-40
611 y(11)-40 667 y(12)-40 724 y(13)-40 780 y(14)-40 836 y(15)-40
893 y(16)-40 949 y(17)-40 1006 y(18)-40 1062 y(19)-40 1119
y(20)-40 1175 y(21)-40 1232 y(22)-40 1288 y(23)-40 1345 y(24)-40
1401 y(25)-40 1457 y(26)-40 1514 y(27)-40 1570 y(28)-40 1627
y(29)-40 1683 y(30)-40 1740 y(31)-40 1796 y(32)-40 1853 y(33)-40
1909 y(34)-40 1966 y(35)-40 2022 y(36)-40 2078 y(37)-40 2135
y(38)-40 2191 y(39)-40 2248 y(40)-40 2304 y(41)-40 2361 y(42)-40
2417 y(43)-40 2474 y(44)-40 2530 y(45)-40 2587 y(46)-40 2643
y(47)-40 2699 y(48)p eop
%%Page: 24 24
bop 75 -100 a Fu(24)723 b Fk(CHAPTER)15 b(5.)35 b(ONE-SIDED)16
b(COMMUNICA)l(TIONS)1875 81 y Fq(>)g Fp(\(Oct\))75 131 y Fo(int)23
b(MPI::Win::unlock\(int)f(rank\))-117 165 y Fq(?)15 b Fp(\(Oct\))166
217 y Fu(Completes)k(at)f(the)h(origin)g(a)f(sequence)i(of)e(RMA)h(accesses)g
(to)f(the)h(windo)o(w)g(asso)q(ciated)g(with)75 274 y Fm(\(win,)c(rank\))p
Fu(.)166 330 y(RMA)k(accesses)g(that)f(are)h(protected)f(b)o(y)h(an)g
(exclusiv)o(e)h(lo)q(c)o(k)g(will)g(not)e(b)q(e)i(concurren)o(t)f(at)f(the)75
387 y(target)c(with)h(other)f(RMA)h(accesses)g(to)f(the)h(same)g(windo)o(w.)
20 b(RMA)15 b(accesses)g(that)f(are)g(protected)h(b)o(y)75
443 y(a)h(shared)h(lo)q(c)o(k)g(will)h(not)e(b)q(e)i(concurren)o(t)e(at)g
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441 y(8)-32 498 y(9)-40 554 y(10)-40 611 y(11)-40 667 y(12)-40
724 y(13)-40 780 y(14)-40 836 y(15)-40 893 y(16)-40 949 y(17)-40
1006 y(18)-40 1062 y(19)-40 1119 y(20)-40 1175 y(21)-40 1232
y(22)-40 1288 y(23)-40 1345 y(24)-40 1401 y(25)-40 1457 y(26)-40
1514 y(27)-40 1570 y(28)-40 1627 y(29)-40 1683 y(30)-40 1740
y(31)-40 1796 y(32)-40 1853 y(33)-40 1909 y(34)-40 1966 y(35)-40
2022 y(36)-40 2078 y(37)-40 2135 y(38)-40 2191 y(39)-40 2248
y(40)-40 2304 y(41)-40 2361 y(42)-40 2417 y(43)-40 2474 y(44)-40
2530 y(45)-40 2587 y(46)-40 2643 y(47)-40 2699 y(48)p eop
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bop 75 -100 a Fu(30)723 b Fk(CHAPTER)15 b(5.)35 b(ONE-SIDED)16
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248 y(for)g(regular)h(put)g(and)g(get)g(accesses.)31 b(Finer)19
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75 1583 y(cac)o(hes.)g(There)c(are)e(three)i(cases)f(to)f(consider.)131
1677 y(1.)22 b(RMA)16 b(is)g(implemen)o(ted)h(using)g(non-coheren)o(t)f
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1790 y(and)d(remote)g(reads)g(ma)o(y)f(go)h(to)f(cac)o(he)i(\(Cra)o(y)e(T90,)
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1996 y(RA)o(CE)15 b(i860?\).)131 2090 y(3.)22 b(RMA)13 b(is)i(implemen)o(ted)
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2297 y(In)j(all)h(cases,)f(the)g(RMA)h(cop)o(y)e(of)h(the)g(windo)o(w)g(is)h
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2353 y(the)f(windo)o(w)f(consists)h(of)f(the)h(v)m(alues)g(in)h(the)e(lo)q
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2523 y(so)g(that)f(the)h(up)q(date)h(b)q(ecomes)g(visible)h(in)f(the)f(RMA)g
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2579 y(as)13 b(part)g(of)f(calls)j(to)d Fm(MPI)p 513 2579 14
2 v 16 w(WIN)p 617 2579 V 16 w(BARRIER,)j(MPI)p 930 2579 V
15 w(WIN)p 1033 2579 V 16 w(COMPLETE)f Fu(and)f Fm(MPI)p 1472
2579 V 16 w(WIN)p 1576 2579 V 16 w(UNLOCK)p Fu(.)g(It)g(is)75
2636 y(su\016cien)o(t)j(to)e(\015ush)i(dirt)o(y)g(cac)o(he)f(lines)i(that)d
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159 y(3)1967 215 y(4)1967 272 y(5)1967 328 y(6)1967 385 y(7)1967
441 y(8)1967 498 y(9)1959 554 y(10)1959 611 y(11)1959 667 y(12)1959
724 y(13)1959 780 y(14)1959 836 y(15)1959 893 y(16)1959 949
y(17)1959 1006 y(18)1959 1062 y(19)1959 1119 y(20)1959 1175
y(21)1959 1232 y(22)1959 1288 y(23)1959 1345 y(24)1959 1401
y(25)1959 1457 y(26)1959 1514 y(27)1959 1570 y(28)1959 1627
y(29)1959 1683 y(30)1959 1740 y(31)1959 1796 y(32)1959 1853
y(33)1959 1909 y(34)1959 1966 y(35)1959 2022 y(36)1959 2078
y(37)1959 2135 y(38)1959 2191 y(39)1959 2248 y(40)1959 2304
y(41)1959 2361 y(42)1959 2417 y(43)1959 2474 y(44)1959 2530
y(45)1959 2587 y(46)1959 2643 y(47)1959 2699 y(48)p eop
%%Page: 31 31
bop 75 -100 a Fk(5.5.)34 b(SEMANTICS)16 b(AND)f(CORRECTNESS)896
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1426 1726 14 2 v 16 w(A:=999)110 1783 y(call)17 b(MPI)p 286
1783 V 16 w(PUT\(bbbb)847 b(stop)15 b(appl.)8 b(thread)110
1839 y(in)o(to)16 b(bu\013)f(of)g(pro)q(cess)g(2\))816 b(bu\013:=777)15
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1952 y(call)17 b(MPI)p 286 1952 V 16 w(WIN)p 399 1952 V 17
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1952 V 17 w(BARRIER)736 2009 y(ccc)f(=)g(bu\013)422 b(ccc:=reg)p
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V 16 w(A)g(and)g(therefore)g(ccc)g(will)75 2171 y(ha)o(v)o(e)e(the)g(old)h(v)
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y(3)-32 215 y(4)-32 272 y(5)-32 328 y(6)-32 385 y(7)-32 441
y(8)-32 498 y(9)-40 554 y(10)-40 611 y(11)-40 667 y(12)-40
724 y(13)-40 780 y(14)-40 836 y(15)-40 893 y(16)-40 949 y(17)-40
1006 y(18)-40 1062 y(19)-40 1119 y(20)-40 1175 y(21)-40 1232
y(22)-40 1288 y(23)-40 1345 y(24)-40 1401 y(25)-40 1457 y(26)-40
1514 y(27)-40 1570 y(28)-40 1627 y(29)-40 1683 y(30)-40 1740
y(31)-40 1796 y(32)-40 1853 y(33)-40 1909 y(34)-40 1966 y(35)-40
2022 y(36)-40 2078 y(37)-40 2135 y(38)-40 2191 y(39)-40 2248
y(40)-40 2304 y(41)-40 2361 y(42)-40 2417 y(43)-40 2474 y(44)-40
2530 y(45)-40 2587 y(46)-40 2643 y(47)-40 2699 y(48)p eop
%%Page: 32 32
bop 75 -100 a Fu(32)728 b Fk(CHAPTER)15 b(5.)30 b(ONE-SIDED)16
b(COMMUNICA)l(TIONS)75 49 y Fr(5.6)59 b(Examples)75 151 y Fl(Example)18
b(5.7)k Fu(The)17 b(follo)o(wing)f(example)h(sho)o(ws)e(a)h(generic)h(lo)q
(osely)g(sync)o(hronous,)f(iterativ)o(e)g(co)q(de,)75 207 y(using)h(barrier)f
(sync)o(hronization.)22 b(The)16 b(windo)o(w)g(at)g(eac)o(h)g(pro)q(cess)g
(consists)g(of)f(arra)o(y)g Fo(A)p Fu(,)g(whic)o(h)i(con-)75
264 y(tains)e(the)h(origin)g(and)f(target)f(bu\013ers)h(of)g(the)g(put)g
(calls.)75 357 y Fo(...)75 414 y(while\(!converged\(A\)\){)147
470 y(update\(A\);)147 527 y(MPI_Barrier\(win\);)147 583 y(for\(i=0;)22
b(i)i(<)g(toneighbors;)e(i++\))218 640 y(MPI_Put\(frombuf\(i\),)f(1,)j
(fromtype\(i\),)e(toneighbor\(i\),)672 696 y(todisp\(i\),)g(1,)i
(totype\(i\),)e(win\);)147 753 y(MPI_Barrier\(win\);)147 809
y(})75 903 y Fu(Same)11 b(co)q(de)h(could)h(b)q(e)f(written)f(with)h(get,)f
(rather)g(than)h(put.)18 b(Note)11 b(that,)g(during)i(the)e(comm)o(unication)
75 959 y(phase,)19 b(eac)o(h)f(windo)o(w)g(is)h(concurren)o(tly)f(read)g
(\(as)g(origin)g(bu\013er)g(of)g(puts\))g(and)g(written)g(\(as)f(target)75
1016 y(bu\013er)e(of)g(puts\).)20 b(This)15 b(is)h(OK,)g(pro)o(vided)g(that)e
(there)h(is)h(no)f(o)o(v)o(erlap)g(b)q(et)o(w)o(een)h(bu\013ers.)75
1122 y Fl(Example)i(5.8)k Fu(Same)13 b(generic)g(example,)h(with)e(more)g
(computation/comm)o(unication)h(o)o(v)o(erlap.)19 b(W)l(e)75
1179 y(assume)14 b(that)f(the)g(up)q(date)i(phase)f(is)g(brok)o(en)g(in)g(t)o
(w)o(o)f(subphases:)20 b(the)13 b(\014rst,)h(where)g(the)f(\\b)q(oundary",)75
1235 y(whic)o(h)18 b(is)f(in)o(v)o(olv)o(ed)h(in)f(comm)o(unication,)h(is)f
(up)q(dated,)h(and)f(the)g(second,)g(where)g(the)g(\\core",)f(whic)o(h)75
1291 y(neither)g(use)g(nor)f(pro)o(vide)g(comm)o(unicated)h(data,)e(is)i(up)q
(dated.)75 1385 y Fo(...)75 1442 y(while\(!converged\(A\)\){)147
1498 y(update_boundary\(A\);)147 1555 y(MPI_Win_barrier\(win\);)147
1611 y(for\(i=0;)22 b(i)i(<)g(fromneighbors;)e(i++\))218 1668
y(MPI_Get\(tobuf\(i\),)g(1,)h(totype\(i\),)g(fromneighbor\(i\),)576
1724 y(fromdisp\(i\),)f(1,)i(fromtype\(i\),)e(win\);)147 1780
y(update_core\(A\);)147 1837 y(MPI_Win_barrier\(win\);)147
1893 y(})75 1987 y Fu(The)12 b(get)f(comm)o(unication)h(can)f(b)q(e)h
(concurren)o(t)g(with)g(the)f(core)g(up)q(date,)i(since)f(they)g(do)f(not)g
(access)h(the)75 2044 y(same)j(lo)q(cations,)i(and)f(the)g(lo)q(cal)h(up)q
(date)f(of)f(the)h(origin)h(bu\013er)f(b)o(y)f(the)h(get)g(call)g(can)g(b)q
(e)h(concurren)o(t)75 2100 y(with)g(the)f(lo)q(cal)h(up)q(date)g(of)f(the)g
(core)h(b)o(y)f(the)g Fo(update)p 1041 2100 15 2 v 16 w(core)g
Fu(call.)24 b(In)17 b(order)f(to)g(get)g(similar)h(o)o(v)o(erlap)75
2157 y(with)g(put)h(comm)o(unication)f(w)o(e)g(w)o(ould)h(need)g(to)e(use)i
(separate)e(windo)o(ws)h(for)g(the)g(core)g(and)g(for)g(the)75
2213 y(b)q(oundary)l(.)75 2319 y Fl(Example)h(5.9)k Fu(Same)14
b(co)q(de)g(as)g(in)g(Example)g(5.7,)f(rewritten)h(using)g(w)o(ait-p)q
(ost-start-complete.)19 b(W)l(e)75 2376 y(assume)c(that)g(eac)o(h)g(pro)q
(cess)g(has)g(a)g(list)h(of)f(pro)q(cesses)h(that)e(access)h(its)h(windo)o
(w..)75 2470 y Fo(...)75 2526 y(while\(!converged\(A\)\){)147
2582 y(update\(A\);)147 2639 y(MPI_Win_post\(fromneighb)o(ors,)21
b(fromneighbor,)h(MPI_WEAK,)g(win\);)147 2695 y(MPI_Win_start\(toneighbo)o
(rs,)f(toneighbor,)h(MPI_WEAK,)h(win\);)1967 46 y Fp(1)1967
103 y(2)1967 159 y(3)1967 215 y(4)1967 272 y(5)1967 328 y(6)1967
385 y(7)1967 441 y(8)1967 498 y(9)1959 554 y(10)1959 611 y(11)1959
667 y(12)1959 724 y(13)1959 780 y(14)1959 836 y(15)1959 893
y(16)1959 949 y(17)1959 1006 y(18)1959 1062 y(19)1959 1119
y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959 1345
y(24)1959 1401 y(25)1959 1457 y(26)1959 1514 y(27)1959 1570
y(28)1959 1627 y(29)1959 1683 y(30)1959 1740 y(31)1959 1796
y(32)1959 1853 y(33)1959 1909 y(34)1959 1966 y(35)1959 2022
y(36)1959 2078 y(37)1959 2135 y(38)1959 2191 y(39)1959 2248
y(40)1959 2304 y(41)1959 2361 y(42)1959 2417 y(43)1959 2474
y(44)1959 2530 y(45)1959 2587 y(46)1959 2643 y(47)1959 2699
y(48)p eop
%%Page: 33 33
bop 75 -100 a Fk(5.6.)29 b(EXAMPLES)1398 b Fu(33)147 49 y Fo(for\(i=0;)22
b(i)i(<)g(toneighbors;)e(i++\))290 106 y(MPI_Put\(frombuf\(i\),)f(1,)j
(fromtype\(i\),)e(toneighbor\(i\),)672 162 y(todisp\(i\),)g(1,)i
(totype\(i\),)e(win\);)147 219 y(MPI_Win_complete\(win\);)147
275 y(MPI_Win_wait\(win\);)147 332 y(})75 437 y Fl(Example)c(5.10)23
b Fu(Same)15 b(example,)g(with)h(split)g(phases,)f(as)g(in)h(Example)g(5.8.)
75 530 y Fo(...)75 586 y(while\(!converged\(A\)\){)147 643
y(update_boundary\(A\);)147 699 y(MPI_Win_post\(toneighbor)o(s,)21
b(toneighbor,)h(MPI_WEAK,)h(win\);)147 755 y(MPI_Win_start\(fromneigh)o
(bors,)e(fromneighbor,)h(MPI_WEAK,)g(win\);)147 812 y(for\(i=0;)g(i)i(<)g
(fromneighbors;)e(i++\))290 868 y(MPI_Get\(tobuf\(i\),)f(1,)j(totype\(i\),)e
(fromneighbor\(i\),)576 925 y(fromdisp\(i\),)g(1,)i(fromtype\(i\),)e(win\);)
147 981 y(update_core\(A\);)147 1038 y(MPI_Win_complete\(win\);)147
1094 y(MPI_Win_wait\(win\);)147 1151 y(})75 1256 y Fl(Example)c(5.11)23
b Fu(A)12 b(c)o(hec)o(k)o(erb)q(oard,)h(or)f(double)h(bu\013er)g(comm)o
(unication)g(pattern,)f(that)g(allo)o(ws)g(more)75 1312 y(computation/comm)o
(unication)19 b(o)o(v)o(erlap.)30 b(Arra)o(y)17 b Fo(A0)h Fu(is)h(up)q(dated)
h(using)f(v)m(alues)h(of)e(arra)o(y)f Fo(A1)p Fu(,)i(and)75
1369 y(vice)j(v)o(ersa.)38 b(W)l(e)22 b(assume)f(that)g(comm)o(unication)h
(is)g(symmetric:)32 b(if)22 b(pro)q(cess)g(A)f(gets)g(data)g(from)75
1425 y(pro)q(cess)15 b(B,)g(then)h(pro)q(cess)f(B)h(gets)e(data)h(from)f(pro)
q(cess)i(A.)f(Windo)o(w)g Fo(wini)g Fu(consists)g(of)g(arra)o(y)f
Fo(Ai)p Fu(.)75 1518 y Fo(...)75 1574 y(MPI_Win_post\(neighbors,)21
b(neighbor,)h(MPI_NOCHECK,)h(win0\);)75 1631 y(MPI_Barrier\(comm0\);)75
1687 y(while\(!converged\(A0,)e(A1\)\){)147 1744 y(/*)i(communication)f(on)i
(A0)f(and)h(computation)e(on)i(A1)f(*/)147 1800 y(update\(A1,)f(A0\))i(/*)f
(local)g(update)g(of)h(A1)g(that)f(depends)g(on)g(A0)h(\(and)f(A1\))h(*/)170
1857 y(MPI_Win_start\(neighbors,)d(neighbor,)i(MPI_NOCHECK,)f(win1\);)147
1913 y(for\(i=0;)g(i)i(<)g(neighbors;)e(i++\))337 1970 y
(MPI_Get\(tobuf0\(i\),)g(1,)h(totype0\(i\),)g(neighbor\(i\),)528
2026 y(fromdisp0\(i\),)f(1,)i(fromtype0\(i\),)e(win0\);)147
2083 y(update\(A1\);)g(/*)i(local)f(update)g(of)g(A1)h(that)505
2139 y(concurrent)e(with)h(communication)f(that)i(updates)f(A0)g(*/)147
2195 y(MPI_Win_post\(neighbors,)d(neighbor,)j(MPI_NOCHECK,)f(win1\);)147
2252 y(MPI_Win_complete\(win0\);)147 2308 y(MPI_Win_wait\(win0\);)147
2421 y(/*)h(communication)f(on)i(A1)f(and)h(computation)e(on)i(A0)f(*/)147
2478 y(update\(A0,)f(A1\))i(/*)f(local)g(update)g(of)h(A0)g(that)f(depends)g
(on)g(A1)h(\(and)f(A0\)*/)147 2534 y(MPI_Rma_start\(neighbors)o(,)e
(neighbor,)i(MPI_NOCHECKcomm1\);)147 2591 y(for\(i=0;)f(i)i(<)g(neighbors;)e
(i++\))290 2647 y(MPI_Get\(tobuf1\(i\),)f(1,)j(totype1\(i\),)e
(neighbor\(i\),)528 2704 y(fromdisp1\(i\),)g(1,)i(fromtype1\(i\),)e(win1\);)
-32 46 y Fp(1)-32 103 y(2)-32 159 y(3)-32 215 y(4)-32 272 y(5)-32
328 y(6)-32 385 y(7)-32 441 y(8)-32 498 y(9)-40 554 y(10)-40
611 y(11)-40 667 y(12)-40 724 y(13)-40 780 y(14)-40 836 y(15)-40

--0__=TucTGjCOn4ZqsHRcAl3Bw9NrWN7qGrf7XCYhPPuZgY9CRBXT6iq1IGCP
893 y(16)-40 949 y(17)-40 1006 y(18)-40 1062 y(19)-40 1119
y(20)-40 1175 y(21)-40 1232 y(22)-40 1288 y(23)-40 1345 y(24)-40
1401 y(25)-40 1457 y(26)-40 1514 y(27)-40 1570 y(28)-40 1627
y(29)-40 1683 y(30)-40 1740 y(31)-40 1796 y(32)-40 1853 y(33)-40
1909 y(34)-40 1966 y(35)-40 2022 y(36)-40 2078 y(37)-40 2135
y(38)-40 2191 y(39)-40 2248 y(40)-40 2304 y(41)-40 2361 y(42)-40
2417 y(43)-40 2474 y(44)-40 2530 y(45)-40 2587 y(46)-40 2643
y(47)-40 2699 y(48)p eop
%%Page: 34 34
bop 75 -100 a Fu(34)723 b Fk(CHAPTER)15 b(5.)35 b(ONE-SIDED)16
b(COMMUNICA)l(TIONS)147 49 y Fo(update\(A0\);)22 b(/*)i(local)f(update)g(of)g
(A0)h(that)f(depends)g(on)h(A0)f(only,)505 106 y(concurrent)f(with)h
(communication)f(that)i(updates)f(A1)g(*/)147 162 y(MPI_Win_post\(neighbors,)
d(neighbor,)j(MPI_NOCHECK,)f(win0\);)147 219 y(MPI_Win_complete\(comm1\))o(;)
147 275 y(MPI_Win_wait\(comm1\);)147 332 y(})75 425 y Fu(A)17
b(pro)q(cess)g(p)q(osts)f(the)h(lo)q(cal)h(windo)o(w)f(asso)q(ciated)f(with)h
Fo(wini)g Fu(b)q(efore)g(it)f(completes)i(RMA)f(accesses)75
482 y(to)c(the)i(remote)e(windo)o(ws)h(asso)q(ciated)h(with)f
Fo(win\(1-i\))p Fu(.)k(When)d(the)f Fo(wait\(wini)p Fu(\))f(call)i(returns,)f
(then)75 538 y(all)21 b(neigh)o(b)q(ors)h(of)e(the)g(calling)j(pro)q(cess)e
(ha)o(v)o(e)f(p)q(osted)h(the)f(windo)o(ws)h(asso)q(ciated)g(with)f
Fo(win\(1-i\))p Fu(.)75 595 y(Therefore,)15 b(no)g(c)o(hec)o(k)g(is)h(needed)
h(on)e(the)g(follo)o(wing)h Fm(MPI)p 1095 595 14 2 v 16 w(WIN)p
1199 595 V 16 w(ST)l(ART)g Fu(call.)1967 46 y Fp(1)1967 103
y(2)1967 159 y(3)1967 215 y(4)1967 272 y(5)1967 328 y(6)1967
385 y(7)1967 441 y(8)1967 498 y(9)1959 554 y(10)1959 611 y(11)1959
667 y(12)1959 724 y(13)1959 780 y(14)1959 836 y(15)1959 893
y(16)1959 949 y(17)1959 1006 y(18)1959 1062 y(19)1959 1119
y(20)1959 1175 y(21)1959 1232 y(22)1959 1288 y(23)1959 1345
y(24)1959 1401 y(25)1959 1457 y(26)1959 1514 y(27)1959 1570
y(28)1959 1627 y(29)1959 1683 y(30)1959 1740 y(31)1959 1796
y(32)1959 1853 y(33)1959 1909 y(34)1959 1966 y(35)1959 2022
y(36)1959 2078 y(37)1959 2135 y(38)1959 2191 y(39)1959 2248
y(40)1959 2304 y(41)1959 2361 y(42)1959 2417 y(43)1959 2474
y(44)1959 2530 y(45)1959 2587 y(46)1959 2643 y(47)1959 2699
y(48)p eop
%%Trailer
end
userdict /end-hook known{end-hook}if
%%EOF

--0__=TucTGjCOn4ZqsHRcAl3Bw9NrWN7qGrf7XCYhPPuZgY9CRBXT6iq1IGCP--

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