Messages in this thread | | | Subject | Re: Linux 2.6 context switching and posix threads performance question | From | Peter Zijlstra <> | Date | Sat, 27 Aug 2005 14:26:22 +0200 |
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On Sat, 2005-08-27 at 14:11 +0200, Mateusz Berezecki wrote: > Hello List Readers, > > I would really appreciate any comment on the overall performance of task > switching with 25 000 threads running on the Linux system. I was asked to work > on some software which spawns 25 000 threads and I am really worried if > it will ever work on 2 CPU HP Blade. The kernel was modified to support > bigger threads amount running (I have no idea how it was done, probably > just changing hardcoded limits) What is the performance impact of > so much threads on the overall system performance? Is there any ? > Wouldn't it be that such application would spend all of its time > switching contexts ? I'm asking for some kind of an authoritative answer > quite urgently. What is the optimum thread amount on 2 CPU SMP system > running Linux ? > Well the obvious question is: what kernel version and which thread library?
2.4 with LinuxThreads might have severe problems. However 2.6 with NPTL should be able to handle it, IIRC Igno once did a million threads with that combination just to show that it worked ;-).
-- Peter Zijlstra <a.p.zijlstra@chello.nl>
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