Newsgroups: comp.parallel.mpi
From: Dudley Scott Nations <nations>
Subject: Re: MPICH with shared memory and Tcp/IP
Organization: Mississippi State University
Date: 18 Dec 1995 15:04:08 GMT
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Message-ID: <4b3vt8$srh@NNTP.MsState.Edu>

I believe that the ch_shmem device represents an exclusive OR option,
i.e. you can have your processes using shared memory for communication
or TCP/IP, but not both.  Therefore you can't mix them up within a group
of workstations.  I think that this is scheduled to be changed in the
future.  Also, as far as I know the ch_shmem device only works for 
SUN's and SGI's.

Disclaimer:  My knowledge of this aspect of MPICH is sketchy.  You
would be well advised to send your question to mpi-bugs@mcs.anl.gov
and get answers from the experts.

Hope this helps.

Scott Nations


