Newsgroups: comp.parallel.mpi From: "Alexander N. Andreyev" Subject: How to increase performance of MPICH (?) Organization: Data Express Online Date: Wed, 24 Dec 1997 18:55:41 +0300 Mime-Version: 1.0 Content-Type: text/plain; harset="koi8-r" Content-Transfer-Encoding: 7bit Message-ID: <67rbos$o12$1@deol.deol.ru> We have installed MPICH 1.1 on a cluster of PII workstations (running Linux and interconnected with 100Mbit ethernet). And would like to reach maximum MPI communication performance possible with such hardware I have a simple test that measures MPI transfer rates. Here are the results Size (bytes) Rate (MB/sec) 1024 2.946 2048 4.200 4096 4.334 8192 0.074 16384 0.049 Which means that MPICH achieves ~4MB/sec on 4K messages and then greatly slows down. Any ideas? ( I would greatly appreciate all your replies about possible causes of the problem and all advices ) ==== please, reply by mail: alexander@vvv.srcc.msu.su and to the newsgroup as well