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Subject: [OMPI devel] kernel 2.6.23 vs 2.6.24 - communication/wait times
From: Oliver Geisler (openmpi_at_[hidden])
Date: 2010-04-06 10:07:35


Hello Devel-List,

I am a little bit helpless about this matter. I already posted in the
user list. In case you don't read the users list, I post in here.

This is the original posting:

http://www.open-mpi.org/community/lists/users/2010/03/12474.php

Short:
Switching from kernel 2.6.23 to 2.6.24 (and up), using openmpi 1.2.7-rc2
(I know outdated, but in debian stable, and same results with 1.4.1)
increases communication times between processes (essentially between one
master and several slave processes). This is regardless of whether the
processes are local only or communication is over ethernet.

Did anybody witness such a behavior?

Ideas what should I test for?

What additional information should I provide for you?

Thanks for your time

oli

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