Newsgroups: comp.parallel.mpi
From: gdburns@osc.edu (Greg Burns)
Subject: Re: Slow LAM/MPI localhost performance ?
Organization: Ohio Supercomputer Center
Date: 12 Mar 1996 04:40:41 -0500
Message-ID: <4i3gqp$o47@tbag.osc.edu>

In article <4i1no0$9ct@bertrand.ccs.carleton.ca> pkc@scs.carleton.ca (Peter Choynowski) writes:
>
>I have been measuring localhost  LAM/MPI performance, and I am finding
>that my  numbers are lower  than I would  expect. The test  involves a
>send and a receive task, sending 4K messages on a P5/133 running Linux
>1.3.69.

Data conversion might be a contributing factor.  The default LAM
byte ordering on-the-wire is HP/SUN/IBM/SGI and not DEC/X86.
Try the -O flag with mpirun(1).

-=-
Greg Burns				gdburns@osc.edu
Ohio Supercomputer Center		http://www.osc.edu/lam.html

