Newsgroups: comp.parallel.mpi
From: salo@mrjones.engr.sgi.com (Eric Salo)
Subject: Re: Pointer conversions exhausted - What does it mean?
Organization: Silicon Graphics, Inc.  Mountain View, CA
Date: 29 Sep 1995 21:35:11 GMT
Message-ID: <44hoqf$3g8@murrow.corp.sgi.com>

> I am running my program on an SGI Power challenge. Now that it doesn't  
> blow up and I am iterating longer I get the message:
> 
> Pointer conversions exhausted
> 
> and execution terminates. I am using two processors, using MPICH, and it  
> was installed using ch_shmem for the device. What does this mean and how  
> do I avoid it.

It sounds like this is a FORTRAN code, and I believe that what you are seeing
is a bug in MPICH. Which version are you using?

Actually, this might be a good place to point out that we have recently
released version 1.0 of our own MPI library for the Power Challenge (which
was also based on MPICH). At 90 MHz, we have measured shared memory latencies
of ~12-20 usecs and bandwidths of ~64 MB/sec, which is quite a bit more than
you'll be able to get out of the ch_shmem device...

Eric Salo         Silicon Graphics Inc.             "Do you know what the
(415)390-2998     2011 N. Shoreline Blvd, 7L-802     last Xon said, just
salo@sgi.com      Mountain View, CA   94043-1389     before he died?"

