Newsgroups: comp.parallel.mpi
From: lusk@mcs.anl.gov (Rusty Lusk)
Subject: Re: MPI Send/Recv limit on data size?
Keywords: MPI
Organization: Math and Computer Science, Argonne.
Date: 14 Apr 1995 15:30:59 GMT
Message-ID: <3mm4fj$29o@milo.mcs.anl.gov>

In article <cjchen.797841696@hecto>, cjchen@hecto.cs.umn.edu (C.J. Chen) writes:
|> Is there a problem with the memory management of MPI relating to
|> MPI Send/Recv?   I am running into problems with sending larger
|> data sizes (eg. 2 MBytes).
|> 
|> p4_error: net_recv read, errno = : 14
|> 
|> This is on SGI Challenge using device ch_p4 with shared memory enabled.
|> (MPICH)
|> 
|> - cj

Problems relating to a particular implementation like this are better
directed to mpi-bugs@mcs.anl.gov.

A better configuration of MPICH on your machine would be to use the non-p4
shared-memory device that comes with version 1.0.8.  I.e.

  configure -arch=sgi -device=ch_shmem -mpe

It will have better performance and incremental transfer through
shared memory for long messages.

Regards,
Rusty

