On 07/06/11 21:36, Steve Kargl wrote:
On Wed, Jul 06, 2011 at 03:18:35PM -0400, Arnaud Lacombe wrote:

On Wed, Jul 6, 2011 at 12:28 PM, Steve Kargl
<s...@troutmask.apl.washington.edu>  wrote:
On Wed, Jul 06, 2011 at 05:29:24PM +0200, O. Hartmann wrote:
I use SCHED_ULE on all machines, since it is supposed to be performing
better on multicore boxes, but there are lots of suggestions switching
back to the old SCHED_4BSD scheduler.

If you are using MPI in numerical codes, then you want
to use SCHED_4BSD. ?I've posted numerous times about ULE
and its very poor performance when using MPI.


It is rather funny to see that the post you point out has generated
exactly 0 meaningful follow-up then and as you mention later in this
thread, the issue still remains today :-)

Apparently, you are privy to my private email exchanges
with jeffr.

I'm also not sure why you're being sarcastic here.  The
issue was and AFAIK still is a problem for anyone using
FreeBSD in a HPC cluster.  ULE simply performs worse than

Well, I know only very little people using FreeBSD within a HPC cluster or even for scientific purposes, except myself and some people around here.
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