Newsgroups: comp.parallel.mpi
From: srd320@cs.usask.ca (Satya Ranjan Dash)
Subject: Re: Performance Issues in MPI
Organization: University of Saskatchewan
Date: 30 May 1995 07:05:05 GMT
Message-ID: <3qeg31$15l@tribune.usask.ca>

Satya Ranjan Dash (srd320@cs.usask.ca) wrote:

:.............

: On  my Ethernet LAN I have run a little test program to measure  the
: performance for transferring double precision numbers (arrays) across
: the MPI processor pool. I found that the cost for sending 1K of double
: precision numbers is around 10-15 seconds on the  average and  in the
: worst case about  25 seconds. 


: The intention of this news item is to explore how other users of MPI are
: fairing in their work and whether either I am terribly goofing in my
:............

Clearly Satya Dash goofed.  I was surprised though no one blasted me for
such ridiculous figures.  MPI-LAM is giving excellent communication
overheads with 0.1 seconds for 1 Etherenet packet and 2 seconds for 8
packetes (4096 double precision data).

--
Thanks.								Dash


