MPI-2 I/O Chapter Proposal

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All interested parties are encouraged to participate in this design
process via the MPI mailing lists, news group, and forum meetings.
See the MPI-2 Web pages for details at:

http://www.mcs.anl.gov/Projects/mpi/mpi2/mpi2.html

This proposal is essentially a reformatting of the MPI-IO Version
0.5 draft (available via http://parallel.nas.nasa.gov/MPI-IO/) with
the following changes:

1. Retained only sections 5 through 9, and a modified section 3.
2. Renamed functions, types, etc., from "MPIO_xxx" to "MPI_xxx".
3. Edited (minor changes) to conform to MPI-2 chapter style.
4. Added clarification regarding:
file consistency semantics,
the use of MPI_Comm in MPI_Open,

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(int)i(bufcount,)f(MPI)p 1321 2649 V 16 w(Status)g(*status\))-32
46 y Fj(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: 20 22
20 21 bop 75 -100 a Ft(20)1342 b Fn(CHAPTER)15 b(10.)35
b(I/O)75 49 y Fp(MPI)p 150 49 15 2 v 17 w(READ)p 263
49 V 16 w(ALL\(FH,)23 b(OFFSET,)g(BUFF,)g(BUFTYPE,)g(BUFCOUNT,)g
(STATUS,)g(IERROR\))170 106 y(<type>)g(BUFF\(*\))170
162 y(INTEGER)g(FH,)h(BUFTYPE,)f(BUFCOUNT,)f(STATUS\(MPI)p
1153 162 V 16 w(STATUS)p 1313 162 V 16 w(SIZE\),)h(IERROR)170
219 y(INTEGER*8)g(OFFSET)166 305 y Fq(MPI)p 251 305 14
2 v 16 w(READ)p 386 305 V 17 w(ALL)10 b Ft(is)h(a)g(collectiv)o(e)i(v)o
(ersion)e(of)f(the)h(blo)q(c)o(king)h Fq(MPI)p 1290 305
V 16 w(READ)f Ft(in)o(terface.)19 b(This)11 b(routine)75
362 y(is)i(seman)o(tically)h(iden)o(tical)g(to)e Fq(MPI)p
694 362 V 16 w(READ)p Ft(,)g(except)h(that)f(all)h(pro)q(cesses)g(in)h
(the)e(comm)o(unicator)g(group)75 418 y(asso)q(ciated)j(with)h(the)f
(\014le)h(handle)h Fq(fh)e Ft(m)o(ust)g(call)h Fq(MPI)p
1026 418 V 16 w(READ)p 1161 418 V 17 w(ALL)p Ft(.)75
540 y Fl(10.3.2)49 b(Blo)q(cking)18 b(W)o(rite)75 720
y Fq(MPI)p 160 720 V 16 w(WRITE\(fh,)d(o\013set,)g(bu\013,)g(buft)o(yp)
q(e,)i(bufcount,)g(status\))117 797 y Ff(IN)155 b Fq(fh)550
b Ff(V)m(alid)13 b(\014le)g(handle)h(\(handle\))117 872
y(IN)155 b Fq(o\013set)484 b Ff(File)14 b(o\013set)g(\(nonnegativ)o(e)g
(o\013set\))117 947 y(IN)155 b Fq(bu\013)514 b Ff(Initial)13
b(address)i(of)e(the)i(user's)f(bu\013er)h(\(in)o(teger\))117
1023 y(IN)155 b Fq(buft)o(yp)q(e)447 b Ff(User's)15 b(bu\013er)g(datat)
o(yp)q(e)f(\(handle\))117 1098 y(IN)155 b Fq(bufcount)422
b Ff(Num)o(b)q(er)14 b(of)f(buft)o(yp)q(e)h(elemen)o(ts)g(\(in)o
(teger\))117 1173 y(OUT)108 b Fq(status)476 b Ff(Status)15
b(information)c(\(Status\))75 1297 y Fp(int)47 b(MPI)p
269 1297 15 2 v 17 w(Write\(MPI)p 502 1297 V 16 w(File)23
b(fh,)h(MPI)p 805 1297 V 17 w(Offset)f(offset,)g(void)g(*buff,)393
1354 y(MPI)p 468 1354 V 17 w(Datatype)g(buftype,)f(int)i(bufcount,)f
(MPI)p 1321 1354 V 16 w(Status)g(*status\))75 1440 y(MPI)p
150 1440 V 17 w(WRITE\(FH,)f(OFFSET,)h(BUFF,)g(BUFTYPE,)g(BUFCOUNT,)g
(STATUS,)g(IERROR\))170 1497 y(<type>)g(BUFF\(*\))170
1553 y(INTEGER)g(FH,)h(BUFTYPE,)f(BUFCOUNT,)f(STATUS\(MPI)p
1153 1553 V 16 w(STATUS)p 1313 1553 V 16 w(SIZE\),)h(IERROR)170
1610 y(INTEGER*8)g(OFFSET)166 1696 y Fq(MPI)p 251 1696
14 2 v 16 w(WRITE)17 b Ft(attempts)f(to)h(write)g(in)o(to)h(the)f
(\014le)h(asso)q(ciated)g(with)f Fq(fh)h Ft(\(at)e(the)i
Fq(o\013set)f Ft(p)q(osition\))75 1753 y(a)e(total)g(n)o(um)o(b)q(er)h
(of)f Fq(bufcount)j Ft(data)d(items)h(ha)o(ving)g Fq(buft)o(yp)q(e)h
Ft(datat)o(yp)q(e)e(from)g(the)h(user's)f(bu\013er)h
Fq(bu\013)p Ft(.)75 1809 y(The)f(data)f(is)h(written)g(in)o(to)g(those)
g(parts)f(of)g(the)h(\014le)h(sp)q(eci\014ed)h(b)o(y)d(\014let)o(yp)q
(e.)21 b Fq(MPI)p 1512 1809 V 16 w(WRITE)15 b Ft(stores)f(the)75
1865 y(n)o(um)o(b)q(er)i(of)e Fq(buft)o(yp)q(e)j Ft(elemen)o(ts)f
(actually)g(written)f(in)h Fq(status)p Ft(.)75 2016 y
Fq(MPI)p 160 2016 V 16 w(WRITE)p 319 2016 V 16 w(ALL\(fh,)f(o\013set,)g
(bu\013,)g(buft)o(yp)q(e,)i(bufcount,)g(status\))75 2120
y Fp(int)47 b(MPI)p 269 2120 15 2 v 17 w(Write)p 406
2120 V 17 w(all\(MPI)p 591 2120 V 16 w(File)23 b(fh,)h(MPI)p
894 2120 V 16 w(Offset)f(offset,)g(void)h(*buff,)393
2177 y(MPI)p 468 2177 V 17 w(Datatype)f(buftype,)f(int)i(bufcount,)f
(MPI)p 1321 2177 V 16 w(Status)g(*status\))75 2263 y(MPI)p
150 2263 V 17 w(WRITE)p 287 2263 V 16 w(ALL\(FH,)g(OFFSET,)g(BUFF,)g
(BUFTYPE,)g(BUFCOUNT,)g(STATUS,)g(IERROR\))170 2319 y(<type>)g
(BUFF\(*\))170 2376 y(INTEGER)g(FH,)h(BUFTYPE,)f(BUFCOUNT,)f
(STATUS\(MPI)p 1153 2376 V 16 w(STATUS)p 1313 2376 V
16 w(SIZE\),)h(IERROR)170 2432 y(INTEGER*8)g(OFFSET)166
2519 y Fq(MPI)p 251 2519 14 2 v 16 w(WRITE)p 410 2519
V 16 w(ALL)12 b Ft(is)g(a)g(collectiv)o(e)i(v)o(ersion)f(of)e(the)i
(blo)q(c)o(king)g Fq(MPI)p 1324 2519 V 16 w(WRITE)f Ft(in)o(terface.)19
b(This)13 b(rou-)75 2575 y(tine)h(is)h(seman)o(tically)f(iden)o(tical)i
(to)d Fq(MPI)p 788 2575 V 16 w(WRITE)p Ft(,)g(except)h(that)f(all)i
(pro)q(cesses)f(in)h(the)e(comm)o(unicator)75 2632 y(group)i(asso)q
(ciated)g(with)h(the)f(\014le)h(handle)h Fq(fh)e Ft(m)o(ust)g(call)h
Fq(MPI)p 1155 2632 V 16 w(WRITE)p 1314 2632 V 16 w(ALL)p
Ft(.)1967 46 y Fj(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: 21 23
21 22 bop 75 -100 a Fn(10.3.)34 b(D)o(A)l(T)l(A)15 b(A)o(CCESS)g(WITH)g
(EXPLICIT)h(OFFSETS)697 b Ft(21)75 49 y Fl(10.3.3)49
b(Nonblo)q(cking)19 b(Read)75 230 y Fq(MPI)p 160 230
14 2 v 16 w(IREAD\(fh,)c(o\013set,)g(bu\013,)g(buft)o(yp)q(e,)i
(bufcount,)g(request\))117 307 y Ff(IN)155 b Fq(fh)550
b Ff(V)m(alid)13 b(\014le)g(handle)h(\(handle\))117 382
y(IN)155 b Fq(o\013set)484 b Ff(File)14 b(O\013set)h(\(nonnegativ)o(e)f
(o\013set\))117 457 y(OUT)108 b Fq(bu\013)514 b Ff(Initial)13
b(address)i(of)e(the)i(user's)f(bu\013er)h(\(in)o(teger\))117
532 y(IN)155 b Fq(buft)o(yp)q(e)447 b Ff(User's)15 b(bu\013er)g(datat)o
(yp)q(e)f(\(handle\))117 607 y(IN)155 b Fq(bufcount)422
b Ff(Num)o(b)q(er)14 b(of)f(buft)o(yp)q(e)h(elemen)o(ts)g(\(nonnegativ)
o(e)g(in)o(teger\))117 682 y(OUT)108 b Fq(request)452
b Ff(Read)14 b(request)h(handle)f(\(handle\))75 807 y
Fp(int)23 b(MPI)p 245 807 15 2 v 17 w(Iread\(MPI)p 478
807 V 16 w(File)g(fh,)h(MPI)p 781 807 V 17 w(Offset)f(offset,)g(void)g
(*buff,)393 863 y(MPI)p 468 863 V 17 w(Datatype)g(buftype,)f(int)i
(bufcount,)f(MPI)p 1321 863 V 16 w(Request)g(*request\))75
950 y(MPI)p 150 950 V 17 w(IREAD\(FH,)f(OFFSET,)h(BUFF,)g(BUFTYPE,)g
(BUFCOUNT,)g(REQUEST,)g(IERROR\))170 1006 y(<type>)g(BUFF\(*\))170
1063 y(INTEGER)g(FH,)h(BUFTYPE,)f(BUFCOUNT,)f(REQUEST,)h(IERROR)170
1119 y(INTEGER*8)g(OFFSET)166 1206 y Fq(MPI)p 251 1206
14 2 v 16 w(IREAD)12 b Ft(is)g(a)g(non)o(blo)q(c)o(king)h(v)o(ersion)f
(of)g(the)g Fq(MPI)p 1094 1206 V 16 w(READ)g Ft(in)o(terface.)19
b Fq(MPI)p 1524 1206 V 16 w(IREAD)12 b Ft(asso)q(ciates)75
1262 y(a)f(request)g(handle)h Fq(request)h Ft(with)f(the)f(I/O)h
(request.)18 b(The)12 b(request)f(handle)h(can)g(b)q(e)f(used)h(later)f
(to)g(query)75 1319 y(the)k(status)f(of)g(the)h(read)g(request)g(\(via)
f Fq(MPI)p 851 1319 V 16 w(TEST)p Ft(\),)g(or)h(w)o(ait)f(for)g(its)h
(completion)h(\(via)f Fq(MPI)p 1719 1319 V 16 w(W)l(AIT)p
Ft(\).)166 1375 y(The)k(non)o(blo)q(c)o(king)i(read)e(call)h(indicates)
g(that)e(the)i(system)e(can)h(start)f(to)h(read)f(data)h(in)o(to)g(the)
75 1431 y(supplied)e(bu\013er.)j(The)15 b(user)g(should)h(not)e(access)
h(an)o(y)g(part)f(of)g(the)h(bu\013er)g(after)f(a)h(non)o(blo)q(c)o
(king)h(read)75 1488 y(is)h(called,)h(un)o(til)f(the)f(read)h
(completes)g(\(as)e(indicated)j(b)o(y)e Fq(MPI)p 1187
1488 V 16 w(TEST)h Ft(or)f Fq(MPI)p 1473 1488 V 15 w(W)l(AIT)p
Ft(\).)g Fq(MPI)p 1730 1488 V 16 w(IREAD)75 1544 y Ft(attempts)e(to)g
(read)h(from)g(the)g(\014le)h(asso)q(ciated)f(with)h
Fq(fh)f Ft(\(at)f(the)h Fq(o\013set)g Ft(p)q(osition\),)h(a)f(total)f
(n)o(um)o(b)q(er)h(of)75 1601 y Fq(bufcount)i Ft(data)e(items)g(ha)o
(ving)h Fq(buft)o(yp)q(e)h Ft(t)o(yp)q(e)e(in)o(to)g(the)h(user's)f
(bu\013er)g Fq(bu\013)p Ft(.)20 b(The)c(n)o(um)o(b)q(er)f(of)g
Fq(buft)o(yp)q(e)75 1657 y Ft(elemen)o(ts)j(actually)h(read)e(can)h(b)q
(e)g(extracted)f(from)g(the)h Fq(MPI)p 1171 1657 V 16
w(TEST)f Ft(or)g Fq(MPI)p 1458 1657 V 16 w(W)l(AIT)h
Ft(return)f(status,)75 1714 y(using)f(the)f(routines)h
Fq(MPI)p 532 1714 V 16 w(GET)p 636 1714 V 16 w(COUNT)g
Ft(or)f Fq(MPI)p 962 1714 V 16 w(GET)p 1066 1714 V 17
w(ELEMENTS)p Ft(.)75 1865 y Fq(MPI)p 160 1865 V 16 w(IREAD)p
308 1865 V 16 w(ALL\(fh,)g(o\013set,)g(bu\013,)g(buft)o(yp)q(e,)i
(bufcount,)g(request\))75 1968 y Fp(int)23 b(MPI)p 245
1968 15 2 v 17 w(Iread)p 382 1968 V 17 w(all\(MPI)p 567
1968 V 16 w(File)g(fh,)h(MPI)p 870 1968 V 16 w(Offset)g(offset,)e(void)
i(*buff,)393 2025 y(MPI)p 468 2025 V 17 w(Datatype)f(buftype,)f(int)i
(bufcount,)f(MPI)p 1321 2025 V 16 w(Request)g(*request\))75
2111 y(MPI)p 150 2111 V 17 w(IREAD)p 287 2111 V 16 w(ALL\(FH,)g
(OFFSET,)g(BUFF,)g(BUFTYPE,)g(BUFCOUNT,)g(REQUEST,)f(IERROR\))170
2168 y(<type>)h(BUFF\(*\))170 2224 y(INTEGER)g(FH,)h(BUFTYPE,)f
(BUFCOUNT,)f(REQUEST,)h(IERROR)170 2281 y(INTEGER*8)g(OFFSET)166
2367 y Fq(MPI)p 251 2367 14 2 v 16 w(IREAD)p 399 2367
V 16 w(ALL)16 b Ft(is)h(a)f(collectiv)o(e)i(v)o(ersion)f(of)f(the)g
(non)o(blo)q(c)o(king)i Fq(MPI)p 1419 2367 V 16 w(IREAD)f
Ft(in)o(terface.)23 b(This)75 2424 y(routine)17 b(is)g(seman)o(tically)
g(iden)o(tical)h(to)e Fq(MPI)p 867 2424 V 16 w(IREAD)p
Ft(,)g(except)g(that)g(all)h(pro)q(cesses)g(in)g(the)f(comm)o(uni-)75
2480 y(cator)e(group)h(asso)q(ciated)h(with)f(the)g(\014le)i(handle)f
Fq(fh)g Ft(m)o(ust)e(call)j Fq(MPI)p 1272 2480 V 15 w(IREAD)p
1419 2480 V 17 w(ALL)p Ft(.)-32 46 y Fj(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 24
22 23 bop 75 -100 a Ft(22)1342 b Fn(CHAPTER)15 b(10.)35
b(I/O)75 49 y Fl(10.3.4)49 b(Nonblo)q(cking)19 b(W)o(rite)75
230 y Fq(MPI)p 160 230 14 2 v 16 w(IWRITE\(fh,)14 b(o\013set,)h
(bu\013,)h(buft)o(yp)q(e,)g(bufcount,)h(request\))117
307 y Ff(IN)155 b Fq(fh)550 b Ff(V)m(alid)13 b(\014le)g(handle)h
(\(handle\))117 382 y(IN)155 b Fq(o\013set)484 b Ff(File)14
b(O\013set)h(\(nonnegativ)o(e)f(o\013set\))117 457 y(IN)155
b Fq(bu\013)514 b Ff(Initial)13 b(address)i(of)e(the)i(user's)f
(bu\013er)h(\(in)o(teger\))117 532 y(IN)155 b Fq(buft)o(yp)q(e)447
b Ff(User's)15 b(bu\013er)g(datat)o(yp)q(e)f(\(handle\))117
607 y(IN)155 b Fq(bufcount)422 b Ff(Num)o(b)q(er)14 b(of)f(buft)o(yp)q
(e)h(elemen)o(ts)g(\(nonnegativ)o(e)g(in)o(teger\))117
682 y(OUT)108 b Fq(request)452 b Ff(W)m(rite)14 b(request)h(handle)f
(\(handle\))75 807 y Fp(int)47 b(MPI)p 269 807 15 2 v
17 w(Iwrite\(MPI)p 526 807 V 16 w(File)23 b(fh,)h(MPI)p
829 807 V 16 w(Offset)f(offset,)g(void)h(*buff,)393 863
y(MPI)p 468 863 V 17 w(Datatype)f(buftype,)f(int)i(bufcount,)f(MPI)p
1321 863 V 16 w(Request)g(*request\))75 950 y(MPI)p 150
950 V 17 w(IWRITE\(FH,)f(OFFSET,)h(BUFF,)g(BUFTYPE,)g(BUFCOUNT,)g
(REQUEST,)g(IERROR\))170 1006 y(<type>)g(BUFF\(*\))170
1063 y(INTEGER)g(FH,)h(BUFTYPE,)f(BUFCOUNT,)f(REQUEST,)h(IERROR)170
1119 y(INTEGER*8)g(OFFSET)166 1206 y Fq(MPI)p 251 1206
14 2 v 16 w(IWRITE)14 b Ft(is)i(a)e(non)o(blo)q(c)o(king)i(v)o(ersion)f
(of)g(the)g Fq(MPI)p 1138 1206 V 15 w(WRITE)g Ft(in)o(terface.)20
b Fq(MPI)p 1595 1206 V 16 w(IWRITE)15 b Ft(asso-)75 1262
y(ciates)g(a)f(request)h(handle)h Fq(request)h Ft(with)e(the)g(I/O)g
(request.)20 b(The)15 b(request)f(handle)i(can)f(b)q(e)h(used)f(later)
75 1319 y(to)j(query)h(the)g(status)f(of)g(the)h(write)g(request)g
(\(via)f Fq(MPI)p 1083 1319 V 16 w(TEST)p Ft(\),)g(or)h(w)o(ait)f(for)g
(its)h(completion)h(\(via)75 1375 y Fq(MPI)p 160 1375
V 16 w(W)l(AIT)p Ft(\).)166 1431 y(The)c(non)o(blo)q(c)o(king)h(write)f
(call)h(indicates)g(that)e(the)h(system)f(can)h(start)f(to)g(write)h
(data)f(from)g(the)75 1488 y(supplied)e(bu\013er.)19
b(The)11 b(user)g(should)h(not)f(access)g(an)o(y)f(part)h(of)f(the)h
(bu\013er)g(after)g(the)g(non)o(blo)q(c)o(king)h(write)75
1544 y(is)i(called,)g(un)o(til)h(the)e(write)g(completes)h(\(as)e
(indicated)j(b)o(y)e Fq(MPI)p 1174 1544 V 16 w(TEST)g
Ft(or)f Fq(MPI)p 1452 1544 V 16 w(W)l(AIT)p Ft(\).)h
Fq(MPI)p 1707 1544 V 15 w(IWRITE)75 1601 y Ft(attempts)h(to)g(write)i
(in)o(to)f(the)g(\014le)h(asso)q(ciated)f(with)h Fq(fh)f
Ft(\(at)f(the)h Fq(o\013set)g Ft(p)q(osition\),)h(a)f(total)f(n)o(um)o
(b)q(er)h(of)75 1657 y Fq(bufcount)h Ft(data)e(items)g(ha)o(ving)g
Fq(buft)o(yp)q(e)i Ft(t)o(yp)q(e)e(from)g(the)g(user's)g(bu\013er)g
Fq(bu\013)p Ft(.)20 b(The)14 b(n)o(um)o(b)q(er)g(of)g
Fq(buft)o(yp)q(e)75 1714 y Ft(elemen)o(ts)f(actually)h(written)f(can)f
(b)q(e)i(extracted)e(from)g(the)h Fq(MPI)p 1190 1714
V 16 w(TEST)g Ft(or)f Fq(MPI)p 1468 1714 V 16 w(W)l(AIT)h
Ft(return)f(status,)75 1770 y(using)k(the)f(routines)h
Fq(MPI)p 532 1770 V 16 w(GET)p 636 1770 V 16 w(COUNT)g
Ft(or)f Fq(MPI)p 962 1770 V 16 w(GET)p 1066 1770 V 17
w(ELEMENTS)p Ft(.)75 1921 y Fq(MPI)p 160 1921 V 16 w(IWRITE)p
332 1921 V 16 w(ALL\(fh,)f(o\013set,)h(bu\013,)g(buft)o(yp)q(e,)i
(bufcount,)g(request\))75 2025 y Fp(int)23 b(MPI)p 245
2025 15 2 v 17 w(Iwrite)p 406 2025 V 17 w(all\(MPI)p
591 2025 V 16 w(File)g(fh,)h(MPI)p 894 2025 V 16 w(Offset)f(offset,)g
(void)h(*buff,)393 2081 y(MPI)p 468 2081 V 17 w(Datatype)f(buftype,)f
(int)i(bufcount,)f(MPI)p 1321 2081 V 16 w(Request)g(*request\))75
2168 y(MPI)p 150 2168 V 17 w(IWRITE)p 311 2168 V 16 w(ALL\(FH,)g
(OFFSET,)g(BUFF,)g(BUFTYPE,)g(BUFCOUNT,)g(REQUEST,)f(IERROR\))170
2224 y(<type>)h(BUFF\(*\))170 2281 y(INTEGER)g(FH,)h(BUFTYPE,)f
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eop
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%%Page: 30 32
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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 33
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2205 y(MPI)p 160 2205 V 16 w(IREAD)p 308 2205 V 16 w(SHARED)p
500 2205 V 18 w(ALL\(fh,)e(bu\013,)i(buft)o(yp)q(e,)g(bufcount,)h
(request\))117 2282 y Ff(IN)155 b Fq(fh)550 b Ff([SAME])14
b(V)m(alid)e(\014le)i(handle)g(\(handle\))117 2356 y(OUT)108
b Fq(bu\013)514 b Ff(Initial)13 b(address)i(of)e(the)i(user's)f
(bu\013er)h(\(in)o(teger\))117 2431 y(IN)155 b Fq(buft)o(yp)q(e)447
b Ff(User's)15 b(bu\013er)g(datat)o(yp)q(e)f(\(handle\))117
2505 y(IN)155 b Fq(bufcount)422 b Ff(Num)o(b)q(er)14
b(of)f(buft)o(yp)q(e)h(elemen)o(ts)g(\(nonnegativ)o(e)g(in)o(teger\))
117 2579 y(OUT)108 b Fq(request)452 b Ff(Read)14 b(request)h(handle)f
(\(handle\))75 2704 y Fp(int)23 b(MPI)p 245 2704 15 2
v 17 w(Iread)p 382 2704 V 17 w(shared)p 543 2704 V 16
w(all\(MPI)p 727 2704 V 16 w(File)h(fh,)f(void)g(*buff,)g(MPI)p
1316 2704 V 17 w(Datatype)g(buftype,)-32 46 y Fj(1)-32
103 y(2)-32 159 y(3)-32 215 y(4)-32 272 y(5)-32 328 y(6)-32
385 y(7)-32 441 y(8)-32 498 y(9)-40 554 y(10)-40 611
y(11)-40 667 y(12)-40 724 y(13)-40 780 y(14)-40 836 y(15)-40
893 y(16)-40 949 y(17)-40 1006 y(18)-40 1062 y(19)-40
1119 y(20)-40 1175 y(21)-40 1232 y(22)-40 1288 y(23)-40
1345 y(24)-40 1401 y(25)-40 1457 y(26)-40 1514 y(27)-40
1570 y(28)-40 1627 y(29)-40 1683 y(30)-40 1740 y(31)-40
1796 y(32)-40 1853 y(33)-40 1909 y(34)-40 1966 y(35)-40
2022 y(36)-40 2078 y(37)-40 2135 y(38)-40 2191 y(39)-40
2248 y(40)-40 2304 y(41)-40 2361 y(42)-40 2417 y(43)-40
2474 y(44)-40 2530 y(45)-40 2587 y(46)-40 2643 y(47)-40
2699 y(48)p eop
%%Page: 32 34
32 33 bop 75 -100 a Ft(32)1342 b Fn(CHAPTER)15 b(10.)35
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2 v 17 w(Request)h(*request\))75 136 y(MPI)p 150 136
V 17 w(IREAD)p 287 136 V 16 w(SHARED)p 447 136 V 17 w(ALL\(FH,)g(BUFF,)
g(BUFTYPE,)f(BUFCOUNT,)h(REQUEST,)g(IERROR\))170 192
y(<type>)g(BUFF\(*\))170 249 y(INTEGER)g(FH,)h(BUFTYPE,)f(BUFCOUNT,)f
(REQUEST,)h(IERROR)166 335 y Fq(MPI)p 251 335 14 2 v
16 w(IREAD)p 399 335 V 16 w(SHARED)p 591 335 V 18 w(ALL)9
b Ft(is)i(a)f(collectiv)o(e)i(v)o(ersion)e(of)g(the)g(non)o(blo)q(c)o
(king)i Fq(MPI)p 1563 335 V 15 w(IREAD)p 1710 335 V 17
w(SHARED)75 392 y Ft(in)o(terface.)20 b(All)d(pro)q(cesses)f(in)g(the)f
(comm)o(unicator)g(group)g(asso)q(ciated)h(with)g(the)f(\014le)h
(handle)h Fq(fh)f Ft(m)o(ust)75 448 y(call)21 b Fq(MPI)p
248 448 V 16 w(IREAD)p 396 448 V 17 w(SHARED)p 589 448
V 17 w(ALL)p Ft(.)e(Eac)o(h)h(pro)q(cess)h(ma)o(y)e(pass)h(di\013eren)o
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75 561 y(tiv)o(e)i(calls,)g(eac)o(h)g(pro)q(cess)f(attempts)g(to)f
(read,)i(from)f(the)g(\014le)i(asso)q(ciated)e(with)h
Fq(fh)p Ft(,)g(a)f(total)g(n)o(um)o(b)q(er)75 617 y(of)i
Fq(bufcount)i Ft(data)d(items)h(ha)o(ving)h Fq(buft)o(yp)q(e)h
Ft(t)o(yp)q(e)e(in)o(to)g(the)g(user's)g(bu\013er)g Fq(bu\013)p
Ft(.)32 b(F)l(or)18 b(eac)o(h)h(pro)q(cess,)75 674 y(the)f(lo)q(cation)
g(in)g(the)g(\014le)h(at)e(whic)o(h)h(data)f(will)i(b)q(e)f(read)g(is)g
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730 y(p)q(oin)o(ter)d(w)o(ould)g(b)q(e)g(after)e(all)j(pro)q(cesses)e
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(this)75 787 y(pro)q(cess)j(had)f(read)h(their)g(data.)23
b Fq(MPI)p 747 787 V 15 w(IREAD)p 894 787 V 17 w(SHARED)p
1087 787 V 18 w(ALL)16 b Ft(returns)g(immediately)i(and)f(do)q(es)f
(not)75 843 y(w)o(ait)d(for)f(the)i(data)e(to)h(b)q(e)h(presen)o(t)f
(in)h(the)f(user's)g(bu\013er.)19 b Fq(MPI)p 1172 843
V 16 w(IREAD)p 1320 843 V 17 w(SHARED)p 1513 843 V 17
w(ALL)13 b Ft(asso)q(ciates)g(an)75 900 y(individual)20
b(request)c(handle)i Fq(request)g Ft(to)d(the)i(I/O)g(request)f(for)g
(eac)o(h)g(pro)q(cess.)24 b(The)16 b(request)h(handle)75
956 y(can)i(b)q(e)h(used)f(later)g(b)o(y)g(a)f(pro)q(cess)h(to)g(query)
g(the)g(status)f(of)g(its)h(individual)j(read)d(request)g(or)f(w)o(ait)
75 1013 y(for)f(its)i(completion.)29 b(On)19 b(eac)o(h)f(pro)q(cess,)h
Fq(MPI)p 916 1013 V 16 w(IREAD)p 1064 1013 V 16 w(SHARED)p
1256 1013 V 18 w(ALL)f Ft(completes)g(when)h(the)f(indi-)75
1069 y(vidual)f(request)e(has)g(completed)i(\(i.e.)j(a)15
b(pro)q(cess)g(do)q(es)h(not)f(ha)o(v)o(e)g(to)g(w)o(ait)f(for)h(all)h
(other)f(requests)h(to)75 1125 y(complete\).)21 b(The)16
b(user)g(should)g(not)f(access)h(an)o(y)f(part)g(of)g(the)h(receiving)h
(bu\013er)f(after)e(a)i(non)o(blo)q(c)o(king)75 1182
y(read)f(is)g(called,)i(un)o(til)f(the)f(read)g(completes.)20
b(The)15 b(shared)g(\014le)h(p)q(oin)o(ter)g(is)f(up)q(dated)h(b)o(y)f
(the)g(amoun)o(ts)75 1238 y(of)j(data)f(requested)i(b)o(y)e(all)i(pro)q
(cesses)g(of)f(the)g(group.)28 b(F)l(or)17 b(eac)o(h)h(pro)q(cess,)h
(the)f(n)o(um)o(b)q(er)g(of)g Fq(buft)o(yp)q(e)75 1295
y Ft(elemen)o(ts)d(actually)h(read)f(b)o(y)f(that)g(pro)q(cess)h(can)g
(b)q(e)h(extracted)e(from)g(the)h Fq(MPI)p 1467 1295
V 16 w(TEST)g Ft(or)f Fq(MPI)p 1749 1295 V 16 w(W)l(AIT)75
1351 y Ft(return)h(status,)f(using)i(the)f(routines)h
Fq(MPI)p 818 1351 V 16 w(GET)p 922 1351 V 17 w(COUNT)g
Ft(or)e Fq(MPI)p 1248 1351 V 16 w(GET)p 1352 1351 V 17
w(ELEMENTS)p Ft(.)75 1468 y Fq(Nonblo)q(cking)i(W)o(rite)f
(\(collective\))75 1648 y(MPI)p 160 1648 V 16 w(IWRITE)p
332 1648 V 16 w(SHARED)p 524 1648 V 17 w(ALL\(fh,)g(bu\013,)g(buft)o
(yp)q(e,)i(bufcount,)g(request\))117 1725 y Ff(IN)155
b Fq(fh)550 b Ff([SAME])14 b(V)m(alid)e(\014le)i(handle)g(\(handle\))
117 1797 y(IN)155 b Fq(bu\013)514 b Ff(Initial)13 b(address)i(of)e(the)
i(user's)f(bu\013er)h(\(in)o(teger\))117 1868 y(IN)155
b Fq(buft)o(yp)q(e)447 b Ff(User's)15 b(bu\013er)g(datat)o(yp)q(e)f
(\(handle\))117 1940 y(IN)155 b Fq(bufcount)422 b Ff(Num)o(b)q(er)14
b(of)f(buft)o(yp)q(e)h(elemen)o(ts)g(\(nonnegativ)o(e)g(in)o(teger\))
117 2011 y(OUT)108 b Fq(request)452 b Ff(W)m(rite)14
b(request)h(handle)f(\(handle\))75 2135 y Fp(int)47 b(MPI)p
269 2135 15 2 v 17 w(Iwrite)p 430 2135 V 16 w(shared)p
590 2135 V 17 w(all\(MPI)p 775 2135 V 16 w(File)23 b(fh,)h(void)f
(*buff,)g(MPI)p 1364 2135 V 17 w(Datatype)g(buftype,)393
2192 y(int)h(bufcount,)e(MPI)p 802 2192 V 17 w(Request)h(*request\))75
2278 y(MPI)p 150 2278 V 17 w(IWRITE)p 311 2278 V 16 w(SHARED)p
471 2278 V 16 w(ALL\(FH,)g(BUFF,)h(BUFTYPE,)e(BUFCOUNT,)h(REQUEST,)g
(IERROR\))170 2335 y(<type>)g(BUFF\(*\))170 2391 y(INTEGER)g(FH,)h
(BUFTYPE,)f(BUFCOUNT,)f(REQUEST,)h(IERROR)166 2478 y
Fq(MPI)p 251 2478 14 2 v 16 w(IWRITE)p 423 2478 V 16
w(SHARED)p 615 2478 V 17 w(ALL)10 b Ft(is)g(a)g(collectiv)o(e)i(v)o
(ersion)f(of)e(the)i(non)o(blo)q(c)o(king)g Fq(MPI)p
1586 2478 V 16 w(IWRITE)p 1758 2478 V 16 w(SHARED)75
2534 y Ft(in)o(terface.)20 b(All)d(pro)q(cesses)f(in)g(the)f(comm)o
(unicator)g(group)g(asso)q(ciated)h(with)g(the)f(\014le)h(handle)h
Fq(fh)f Ft(m)o(ust)75 2591 y(call)j Fq(MPI)p 246 2591
V 16 w(IWRITE)p 418 2591 V 16 w(SHARED)p 610 2591 V 17
w(ALL)p Ft(.)e(Eac)o(h)h(pro)q(cess)g(ma)o(y)f(pass)h(di\013eren)o(t)g
(argumen)o(t)f(v)m(alues)i(for)e(the)75 2647 y Fq(buft)o(yp)q(e)h
Ft(and)e Fq(bufcount)i Ft(argumen)o(ts.)j(After)15 b(all)i(pro)q
(cesses)f(of)g(the)g(group)f(ha)o(v)o(e)h(issued)h(their)f(resp)q(ec-)
75 2704 y(tiv)o(e)e(calls,)h(eac)o(h)f(pro)q(cess)h(attempts)e(to)g
(write,)h(in)o(to)g(the)h(\014le)g(asso)q(ciated)f(with)g
Fq(fh)p Ft(,)h(a)e(total)h(n)o(um)o(b)q(er)g(of)1967
46 y Fj(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 35
33 34 bop 75 -100 a Fn(10.6.)34 b(FILETYPE)15 b(CONSTR)o(UCTORS)992
b Ft(33)75 49 y Fq(bufcount)19 b Ft(data)d(items)g(ha)o(ving)h
Fq(buft)o(yp)q(e)i Ft(t)o(yp)q(e)d(con)o(tained)h(in)h(the)e(user's)h
(bu\013er)f Fq(bu\013)p Ft(.)25 b(F)l(or)15 b(eac)o(h)i(pro-)75
106 y(cess,)c(the)g(lo)q(cation)g(in)g(the)g(\014le)h(at)e(whic)o(h)h
(data)f(will)i(b)q(e)g(written)e(is)h(the)g(p)q(osition)h(at)e(whic)o
(h)h(the)g(shared)75 162 y(\014le)j(p)q(oin)o(ter)g(w)o(ould)g(b)q(e)g
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(are)g(less)h(than)f(that)f(of)75 219 y(this)k(pro)q(cess)g(had)g
(written)g(their)g(data.)27 b Fq(MPI)p 905 219 14 2 v
16 w(IWRITE)p 1077 219 V 16 w(SHARED)p 1269 219 V 17
w(ALL)18 b Ft(returns)f(immediately)j(and)75 275 y(do)q(es)e(not)g(w)o
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(bu\013er.)28 b Fq(MPI)p 1417 275 V 16 w(IWRITE)p 1589
275 V 16 w(SHARED)p 1781 275 V 17 w(ALL)75 332 y Ft(asso)q(ciates)18
b(an)h(individual)j(request)c(handle)i Fq(request)g Ft(to)e(the)h(I/O)g
(request)f(for)g(eac)o(h)h(pro)q(cess.)30 b(The)75 388
y(request)19 b(handle)h(can)f(b)q(e)g(used)g(later)g(b)o(y)g(a)f(pro)q
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444 y(request)15 b(or)g(w)o(ait)g(for)g(its)g(completion.)22
b(On)16 b(eac)o(h)f(pro)q(cess,)g Fq(MPI)p 1207 444 V
16 w(IWRITE)p 1379 444 V 16 w(SHARED)p 1571 444 V 17
w(ALL)g Ft(completes)75 501 y(when)i(the)g(individual)j(write)d
(request)g(has)f(completed)i(\(i.e.)25 b(a)16 b(pro)q(cess)h(do)q(es)g
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g(to)g(complete\).)20 b(The)c(user)f(should)h(not)f(access)h(an)o(y)f
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(c)o(king)i(write)e(is)g(called,)j(un)o(til)e(the)f(write)g(is)h
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670 y(is)d(up)q(dated)h(b)o(y)f(the)f(amoun)o(ts)g(of)h(data)f
(requested)h(b)o(y)g(all)g(pro)q(cesses)h(of)e(the)h(group.)24
b(F)l(or)16 b(eac)o(h)h(pro-)75 727 y(cess,)22 b(the)f(n)o(um)o(b)q(er)
g(of)f Fq(buft)o(yp)q(e)j Ft(elemen)o(ts)f(actually)f(written)g(b)o(y)g
(that)f(pro)q(cess)h(can)g(b)q(e)g(extracted)75 783 y(from)c(the)h
Fq(MPI)p 351 783 V 16 w(TEST)h Ft(or)e Fq(MPI)p 640 783
V 16 w(W)l(AIT)h Ft(return)g(status,)g(using)g(the)h(routines)f
Fq(MPI)p 1542 783 V 16 w(GET)p 1646 783 V 17 w(COUNT)g
Ft(or)75 840 y Fq(MPI)p 160 840 V 16 w(GET)p 264 840
V 17 w(ELEMENTS)p Ft(.)75 957 y Fq(Seek)e(\(collective\))75
1137 y(MPI)p 160 1137 V 16 w(SEEK)p 287 1137 V 16 w(SHARED\(fh,)g
(o\013set,)f(whence\))117 1214 y Ff(IN)155 b Fq(fh)550
b Ff([SAME])14 b(V)m(alid)e(\014le)i(handle)g(\(handle\))117
1286 y(IN)155 b Fq(o\013set)484 b Ff([SAME])14 b(File)f(o\013set)i
(\(o\013set\))117 1358 y(IN)155 b Fq(whence)450 b Ff([SAME])14
b(Up)q(date)g(mo)q(de)f(\(in)o(teger\))75 1482 y Fp(int)23
b(MPI)p 245 1482 15 2 v 17 w(Seek)p 358 1482 V 17 w(shared\(MPI)p
615 1482 V 16 w(File)g(fh,)g(MPI)p 917 1482 V 17 w(Offset)g(offset,)g
(MPI)p 1364 1482 V 17 w(Whence)g(whence\))75 1569 y(MPI)p
150 1569 V 17 w(SEEK)p 263 1569 V 16 w(SHARED\(FH,)g(OFFSET,)g
(WHENCE\))170 1625 y(INTEGER)g(FH,)h(WHENCE)170 1682
y(INTEGER*8)f(OFFSET)166 1768 y Fq(MPI)p 251 1768 14
2 v 16 w(SEEK)p 378 1768 V 16 w(SHARED)17 b Ft(up)q(dates)f(the)g
(shared)g(\014le)h(p)q(oin)o(ter)f(according)g(to)f Fq(whence)p
Ft(,)i(whic)o(h)g(could)75 1824 y(ha)o(v)o(e)e(the)g(follo)o(wing)h(p)q
(ossible)h(v)m(alues:)143 1902 y Fh(\017)23 b Fg(MPI)p
266 1902 13 2 v 14 w(SEEK)p 382 1902 V 14 w(SET)p Ft(:)15
b(the)h(p)q(oin)o(ter)f(is)h(set)f(to)f Fq(o\013set)143
1989 y Fh(\017)23 b Fg(MPI)p 266 1989 V 14 w(SEEK)p 382
1989 V 14 w(CUR)p Ft(:)14 b(the)h(p)q(oin)o(ter)h(is)g(set)f(to)f(the)h
(curren)o(t)h(p)q(oin)o(ter)f(p)q(osition)i(plus)f Fq(o\013set)143
2076 y Fh(\017)23 b Fg(MPI)p 266 2076 V 14 w(SEEK)p 382
2076 V 14 w(END)p Ft(:)15 b(the)h(p)q(oin)o(ter)f(is)h(set)f(to)g(the)g
(end)h(of)e(the)i(\014le)g(plus)g Fq(o\013set)166 2154
y Ft(All)d(the)f(pro)q(cesses)g(in)g(the)g(comm)o(unicator)g(group)f
(asso)q(ciated)h(with)g(the)g(\014le)h(handle)g Fq(fh)f
Ft(m)o(ust)f(call)75 2210 y Fq(MPI)p 160 2210 14 2 v
16 w(SEEK)p 287 2210 V 16 w(SHARED)18 b Ft(with)g(the)f(same)g
Fq(o\013set)g Ft(and)g Fq(whence)p Ft(.)27 b(All)19 b(pro)q(cesses)e
(in)h(the)f(comm)o(unicator)75 2266 y(group)e(are)g(sync)o(hronized)h
(with)g(a)f(barrier)g(b)q(efore)h(the)f(shared)g(\014le)h(p)q(oin)o
(ter)g(is)g(up)q(dated.)166 2323 y(The)c Fq(o\013set)g
Ft(is)g(relativ)o(e)h(to)e(the)h(\014let)o(yp)q(e)h(\(not)e(coun)o
(ting)i(holes\),)f(in)h(units)f(of)g Fq(et)o(yp)q(e)p
Ft(.)20 b(The)12 b(constan)o(t)75 2379 y Fg(MPI)p 152
2379 13 2 v 14 w(OFFSET)p 321 2379 V 14 w(ZERO)j Ft(is)h(de\014ned)g
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b(Constructo)n(rs)75 2704 y Fe(Discussion:)14 b Ff(Should)c(w)o(e)h(mo)
o(v)o(e)e(these)k(datat)o(yp)q(e)e(constructors)h(to)f(the)h(\\Datat)o
(yp)q(e)e(Impro)o(v)o(emen)o(ts")f(section?)-32 46 y
Fj(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: 34 36
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eop
%%Page: 42 44
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2643 y(47)1959 2699 y(48)p eop
%%Page: 43 45
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%%Page: 44 46
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y(44)p eop
%%Trailer
end
userdict /end-hook known{end-hook}if
%%EOF

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