Newsgroups: comp.parallel.mpi
From: shane@erc.msstate.edu (Shane Hebert)
Subject: Re: MPI vs native-CRAY
Organization: Mississippi State University
Date: Mon, 26 Aug 1996 20:12:29 GMT
Message-ID: <322204c5.366537859@nntp.msstate.edu>

On 22 Aug 1996 12:47:34 GMT, an alien in the guise of
I.J.Bush@dl.ac.uk (I.J. Bush) wrote:

Don't forget about the Cray T3D device that is delivered with
MPICH.

MPICH:	106 Mbytes/s bandwidth, 39 microseconds latency


>|Round figures ( MPI is from EPCC ):
>|
>|MPI      :  40 Mbytes/s bandwidth, 30 microseconds latency
>|SHMEM_PUT: 120 Mbytes/s          ,  6 microseconds
>|SHMEM_GET:  60 Mbytes/s          ,  6 microseconds
>|
>|( Note that this latency is what you see after mucking
>|about ensuring cache etc. coherency, not just for the
>|PUT/GET call )
>|

============================================================
Shane Hebert
shane@erc.msstate.edu
Disclaimer:  Any opinions stated above are mine and not
those of my employer.
Disclaimer:  If I say something and you do it, it isn't
my fault.

