Messages in this thread | | | Date | Sat, 10 Nov 2007 00:56:07 +0100 | From | Cyrus Massoumi <> | Subject | Re: High priority tasks break SMP balancer? |
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Hi Micah
> On my machine (2-way Opteron with a vanilla 2.6.23.1 kernel) this test > program will reliably put the scheduler into a state where one CPU has > both of the busy-looping processes in its runqueue, and the other CPU > is usually idle. The usually-idle CPU will have a very high cpu_load, > as reported by /proc/sched_debug.
I tried your program on my machine (C2D, 2.6.17, O(1) scheduler).
Both CPUs are 100% busy all the time. Each busy-looping thread is running on its own CPU. I've been watching top output for 10 minutes, the spreading is stable and the threads don't bounce at all.
greetings Cyrus
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