[OMPI users] Persistent Communication using MPI_SEND_INIT, MPI_RECV_INIT etc.

Hi all, I've inherited a MPI code that was written ~8-10 years ago and it predominately uses MPI persistent communication routines for data transfers e.g. MPI_SEND_INIT, MPI_RECV_INIT, MPI_START etc. I was just wondering if using persistent communication calls is still the most efficient/scala

Re: [OMPI users] MPI_TAG_UB printing zero with Intel Compiler

ssors (MPI_COMM_GET_ATTR page 229 in the MPI 2.2 standard). george. On Mar 13, 2012, at 13:51 , Timothy Stitt wrote: Hi Jeff, I went through the procedure of compiling and running, then copied the procedure verbatim from the command line (see below). [tstitt@memtfe] /pscratch/tstit

Re: [OMPI users] MPI_TAG_UB printing zero with Intel Compiler

Jeffrey Squyres wrote: Tim -- I am unable to replicate this problem with a 1.4 build with icc. Can you share your test code? On Mar 10, 2012, at 7:30 PM, Timothy Stitt wrote: Hi all, I was experimenting with MPI_TAG_UB in my code recently and found that its value is set to 0 in my v1.4.3 an

[OMPI users] MPI_TAG_UB printing zero with Intel Compiler

Hi all, I was experimenting with MPI_TAG_UB in my code recently and found that its value is set to 0 in my v1.4.3 and v1.4.5 builds (these are the only builds I have available to test). Oddly it only happens with my builds compiled with the Intel compiler. The PGI builds do produce a non-zero

Re: [OMPI users] AlltoallV (with some zero send count values)

Thanks Jed for the advice. How well-implemented are the one-sided communication routines? Are they something that could be trusted in a production code? Sent from my iPad On Mar 6, 2012, at 6:06 PM, "Jed Brown" mailto:j...@59a2.org>> wrote: On Tue, Mar 6, 2012 at 15:4

[OMPI users] AlltoallV (with some zero send count values)

Hi all, Can anyone tell me whether it is legal to pass zero values for some of the send count elements in an MPI_AlltoallV() call? I want to perform an all-to-all operation but for performance reasons do not want to send data to various ranks who don't need to receive any useful values. If it i

Re: [OMPI users] Scatter+Group Communicator Issue

Mar 6, 2012, at 10:19 AM, Timothy Stitt wrote: Will definitely try that. Thanks for the suggestion. Basically, I need to be able to scatter values from a sender to a subset of ranks (as I scale my production code, I don't want to use MPI_COMM_WORLD, as the receiver list will be quite

Re: [OMPI users] Scatter+Group Communicator Issue

collectives by a: if (MPI_COMM_NULL != new_comm) { } could be enough. But may be I'm wrong: I'll let the specialists answer. Regards, Nadia -- Nadia Derbey users-boun...@open-mpi.org<mailto:users-boun...@open-mpi.org> wrote on 03/06/2012 02:32:03 PM: > De : Tim

Re: [OMPI users] Scatter+Group Communicator Issue

<mailto:users-boun...@open-mpi.org> wrote on 03/06/2012 01:52:06 PM: > De : Timothy Stitt mailto:timothy.stit...@nd.edu>> > A : "us...@open-mpi.org<mailto:us...@open-mpi.org>" > mailto:us...@open-mpi.org>> > Date : 03/06/2012 01:52 PM > Objet : [OMP

[OMPI users] Scatter+Group Communicator Issue

Hi all, I am scratching my head over what I think should be a relatively simple group communicator operation. I am hoping some kind person can put me out of my misery and figure out what I'm doing wrong. Basically, I am trying to scatter a set of values to a subset of process ranks (hence the

[OMPI users] MPI_ALLREDUCE: Segmentation Fault

Hi all, We have a code built with OpenMPI (v1.4.3) and the Intel v12.0 compiler that has been tested successfully on 10s - 100s of cores on our cluster. We recently ran the same code with 1020 cores and received the following runtime error: > [d6cneh042:28543] *** Process received signal *** >