Messages in this thread | | | Date | Fri, 29 Jan 2016 11:15:22 +0100 | From | Peter Zijlstra <> | Subject | Re: [BUG] scheduler doesn't balance thread to idle cpu for 3 seconds |
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On Thu, Jan 28, 2016 at 01:43:13PM -0500, Jan Stancek wrote: > > How long should I have to wait for a fail? > > It's about 1000-2000 iterations for me, which I think you covered > by now in those 2 hours.
So I've been running:
while ! ./pthread_cond_wait_1 ; do sleep 1; done
overnight on the machine, and have yet to hit a wobbly -- that is, its still running.
Also note that I don't think failing this test is a bug per se. Undesirable maybe, but within spec, since SIGALRM is process wide, so it being delivered to the SCHED_OTHER task is accepted, and SCHED_OTHER has no timeliness guarantees.
That said; if I could reliably reproduce I'd have a go at fixing this, I suspect there's a 'fun' problem at the bottom of this.
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