Best and cheers, Alex.
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Dr. Alexander D. Stoyen
President & CEO
21st Century Systems, Inc.
420 Hardscrabble Road
Chappaqua, NY 10514-3030
(914) 769-2939 (office)
(914) 769-0949 (fax)
Email: alex@21csi.com
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> From: Tony Skjellum <tony@Aurora.CS.MsState.Edu>
> To: mpi-realtime@mcs.anl.gov
> Subject: Fault tolerance should be considered later (eg, MPI/RT mark 2)
> Date: Sunday, January 19, 1997 2:09 PM
>
> Folks,
>
> On Wednesday in Sub-committee, I am going to propose that we review the
> division of real-time discussions, proposals, and standardization into
two
> parts: immediate action, and later action, and that fault tolerance in
> terms of specific add-on features to the chapter be considered only after
> we have working prototypes of MPI/RT in the field, so that we do not
> dilute our current efforts. Since we are not under the same time-ending
> constraint as MPI-2, this allows us to separate concerns usefully, and
get
> a working MPI/RT of limited scope. We can still return to this issue
this
> year, only later this year (eg, 4th quarter).
>
> I am concerned that fault tolerance of any kind totally will diffuse our
> effort right now, and as it is clear that fault tolerance and high
> performance are often mutually exclusive, we need to think carefully
> before jumping off in this direction. Ideally, in the MPI/RT as a
> "standard within MPI Standard or Addendum within MPI standard", we can
> have multiple chapters, one of which addresses FT, and accepts different
> operational assumptions and requirements than the base RT.
>
> I suggest that weak FT issues will be addressed in MPI-2, MPI/RT, but we
> need to be careful to address the primary audiences of MPI/RT (hard and
> soft real-time systems with expectations of high performance) first.
> We are not nearly through with this as yet.
>
> This thinking is analogous to the limitations MPI Forum set on MPI-1,
> where certain classes of features were deferred.
>
> -Tony
>
> Anthony Skjellum, PhD, Associate Professor of Computer Science;
> Mississippi State University, Department of Computer Science & NSF ERC
> Butler, Rm 300, PO Box 9637, Corner of Perry&Barr, Mississippi State,MS
39762
> (601)325-8435 FAX: (601)325-8997; http://www.erc.msstate.edu/~tony;
> "Persistence is fertile." ; e-mail: tony@cs.msstate.edu; Try MPI!
>