Messages in this thread | | | Date | Tue, 16 Jan 2007 07:14:39 -0800 | From | Ulrich Drepper <> | Subject | Re: [PATCH 2.6.20-rc4 0/4] futexes functionalities and improvements |
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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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