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runtime/pprof: failure in TestCPUProfileMultithreaded #36084

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bcmills opened this issue Dec 11, 2019 · 6 comments
Open

runtime/pprof: failure in TestCPUProfileMultithreaded #36084

bcmills opened this issue Dec 11, 2019 · 6 comments

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@bcmills
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@bcmills bcmills commented Dec 11, 2019

2019-12-10T21:31:00-84540f0/aix-ppc64

This is the only occurrence I've seen so far, so I'm not sure if it's specific to AIX, PPC64, neither, or both.

CC @hyangah @Helflym @laboger

@bcmills
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@bcmills bcmills commented Dec 11, 2019

See previously: #13223, #10842, #10289, #9605, #7095, #6522.

@bcmills
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@bcmills bcmills commented Dec 11, 2019

CC @aclements @mknyszek in case this has to do with async preemption.

@hyangah
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@hyangah hyangah commented Dec 12, 2019

I am not familiar with this platform's performance. Currently the test profiles for 100msec, and tries a couple of times as doubling the profile duration. Would it be helpful to use a longer duration?

@Helflym
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@Helflym Helflym commented Dec 16, 2019

AIX might be a bit slow when handling signals like SIGPROF there. But the test seems to end up with a 3.2s duration (as seen with pprof_test.go:285: retrying with 3.2s duration), so I'm not sure increasing the duration will change anything.
Note that I've never seen this bug before.

@bcmills
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@bcmills bcmills commented Apr 1, 2020

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