Newsgroups: comp.parallel.mpi
From: owner-cm-mpi@ee.msc.edu
Subject: Re: I/O in MPI
Organization: UTexas Mail-to-News Gateway
Date: 1 Aug 1995 12:12:52 -0500
Message-ID: <9508011712.AA15277@ee.msc.edu>
 
There is not, at this time, an official MPI IO standard.  There are 
some discussions and some private offerings.  (Look at
http://www.mcs.anl.gov/mpi/index.html for more information.)

There is, to the best of my knowledge, no reason you cannot use cmmd calls
with MPI.  

 > From: "Andy Wissink" <wissink@aem.umn.edu>
 > Sender: cm-mpi Distribution List <cm-mpi@ee.msc.edu>
 > Precedence: bulk
 > Date: Tue, 1 Aug 1995 10:20:49 -0500 (CDT)
 > 
 > Hi,
 > 
 > I have a program containing CMMD calls that I'd like to port to MPI.
 > One concern I have, however, is the I/O.  Currently, I use the 
 > sequential read/write commands in CMMD (i.e. cmmd_sync_seq), whereby
 > the processors read/write data from/to a single file in sequential
 > format (proc 0, proc 1, ...). From what I've read, it sounds like 
 > MPI only uses the local mode (i.e. cmmd_independent).  In addition,
 > I've read it is not a good idea to mix CMMD and MPI for I/O purposes.
 > 
 > Thus, my question is... If I want to keep the single file sequential 
 > read/write I/O constructs I have (in CMMD), is it a futile effort to 
 > port to MPI?  Or do you think this construct would work in MPI?
 > 
 > Thanks!
 > Andy Wissink - mxu0306
 > 

------
 Stephen Saroff				Computational Physicist
 Minnesota Supercomputer Ctr.		email: saroff@msc.edu
 1200 Washington Ave S.			voice: 612/337-3423
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