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runtime/pprof: TestCPUProfileMultithreaded is flaky on ppc64le #13223
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@davecheney, can you provide the kernel config for the linux-ppc64le-canonical builder? In particular, if CONFIG_HIGH_RES_TIMERS is not set, this is probably the same as #13405. |
I'm guessing it's this one: http://kernel.ubuntu.com/~kernel-ppa/configs/trusty/ppc64el-config.flavour.generic, which does have CONFIG_HIGH_RES_TIMERS set. |
@aclements, what's the magic /proc file to look in to find out timer resolution? |
grep resolution: /proc/timer_list |
FWIW I got lots of '1 nsecs' with that grep on a ppc64le machine (but not
the Canonical builder).
So at least some hardware does have good timers.
|
@rsc from the canonical ppc64le machine
|
CL https://golang.org/cl/18683 mentions this issue. |
For example from http://build.golang.org/log/a58e91460d1b6bec7380bd3f9f86f57483aa2e22:
Very old neurons recall that the timer on powerpc has pretty low resolution, but I don't know if that is true or the problem here.
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