[Beowulf] MPICH2 + PVFS2 + Help needed urgently.

Michael Will mwill at penguincomputing.com
Sun Jun 5 23:43:06 PDT 2005

I have not had a chance to test anything yet, but my first guess is that you
are not having realistic benchmark numbers to begin with.

You say you see 122MB/s write, 880MB/s read? That for sure is not
across gigabit ethernet unless you have eight NICs on the reading node ;-)

If you were using infiniband this might be realistic, but for gigabit 
it is not.

Viel Glueck,


Michael Gauckler wrote:

>Dear Lists,
>I am having problems with the performance of MPICH2 and PVFS2.
>The program attached below should write 136MB junks of data to a 
>2.7GB file on a pvfs2 mount.
>Unfortunately the performance is so poor that my program never
>finishes. PVFS2 performance seems not great but acceptable for 
>136 MB junks to finish soon (122MB/s, see below).
>If someone could run a test on his machine and give me estimation of
>the runtime or hints where the problem might be I would be more than
>happy! I need to locate the problem: Code, MPICH2, ROMIO, PVFS2.
>Sincereley yours,

Michael Will
Penguin Computing Corp.
Sales Engineer
415-954-2899 fx
mwill at penguincomputing.com 
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