[mpich-discuss] Automatic reply: MPI_THREAD_MULTIPLE on Microsoft HPC platform

[Fab Tillier]

Hi Dmitriy,

MSMPI doesn’t support MPI_THREAD_MULTIPLE today, but it’s on our list of features to consider in future releases.  We don’t yet have a concrete timeline for such support, though.  The feedback we’ve received in the past is that MPI_THREAD_MULTIPLE often regresses the MPI_THREAD_SERIALIZED model and applications can get better overall performance from having multiple MPI_THREAD_SERIALIZED applications rather than a single MPI_THREAD_MULTIPLE application.  This is the main reason we have been focusing on improving performance and scalability for the MPI_THREAD_SERIALIZED model.

Note that MPICH2 is on a different development schedule, so they may well have MPI_THREAD_MULTIPLE support, and can run on Windows HPC Server.  Other MPI vendors support MPI_THREAD_MULTIPLE on Windows too, for example Intel MPI.  So while MSMPI doesn’t support MPI_THREAD_MULTIPLE, there’s nothing to prevent it in the Microsoft HPC platform: you can configure your cluster to use a different MPI library than MSMPI (e.g. MPICH2, Intel MPI, Platform MPI, etc.)

Hopefully this helped,
-Fab

From: Dmitriy Golovashkin [mailto:golovashkin at gmail.com]
Sent: Wednesday, March 30, 2011 3:09 PM
To: Fab Tillier; Robert Palmer
Subject: Fwd: Automatic reply: [mpich-discuss] MPI_THREAD_MULTIPLE on Microsoft HPC platform

Folks,

Is MPI_THREAD_MULTIPLE supported on
    Windows Server 2008 R2  HPC 3.1.3267.0 ?

Specifically MPI_Init_thread( ..., required, provided )

for required = MPI_THREAD_MULTIPLE
returns
provided = MPI_THREAD_SERIALIZED

Any plans to include support for MPI_THREAD_MULTIPLE in the future?

Thank you!

Kind regards,
Dmitriy.



---------- Forwarded message ----------
From: Eric Lantz (HPC) <elantz at microsoft.com<mailto:elantz at microsoft.com>>
Date: Wed, Mar 30, 2011 at 3:01 PM
Subject: Automatic reply: [mpich-discuss] MPI_THREAD_MULTIPLE on Microsoft HPC platform
To: Dmitriy Golovashkin <golovashkin at gmail.com<mailto:golovashkin at gmail.com>>


Thank you for your message.

However, I'm on vacation from Wednesday (Mar29) through Friday  (Apr1) - with little or no access to email.  Then I'll be attending the OpenFabrics Alliance Workshop in Monterey, CA from Sunday (Apr3) through Wednesday (Apr6).
I'll be back on a normal work schedule starting Thursday (Apr7).


For urgent NetworkDirect issues please contact Fab Tillier (ftillier at microsoft.com<mailto:ftillier at microsoft.com>).
For urgent MS-MPI or performance issues please contact Robert Palmer (robert.palmer at microsoft.com<mailto:robert.palmer at microsoft.com>).

My appologies for any inconvenience,
Eric



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