Re: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements

[Ulrich Drepper <drepper@redhat.com>]

Pierre Peiffer wrote:
> I've run this bench 1000 times with pipe and 800 groups.
> Here are the results:

This is not what I'm mostly concerned about.  The patches create a
bottleneck since _all_ processes use the same resource.  Plus, this code
has to be run on a machine with multiple processors to get RFOs into play.

So, please do this: on an SMP (4p or more) machine, rig the test so that
it runs quite a while.  Then, in a script, start the program a bunch of
times, all in parallel.  Have the script wait until all program runs are
done and time the time until the last program finishes.

-- 
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖

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