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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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NeedsInvestigation OS-AIX arch-ppc64x
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Unplanned

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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 bcmills added this to the Unplanned milestone Dec 11, 2019
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@bcmills bcmills commented Dec 11, 2019

See previously: #13223, #10842, #10289, #9605, #7095, #6522.
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@bcmills bcmills commented Dec 11, 2019

CC @aclements @mknyszek in case this has to do with async preemption.
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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?
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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.
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@bcmills bcmills commented Feb 20, 2020

2020-02-19T22:04:29-f4f7db4/aix-ppc64
2019-12-20T20:12:18-b234fdb/aix-ppc64
@bcmills bcmills mentioned this issue Feb 20, 2020
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@bcmills bcmills commented Apr 1, 2020

2020-04-01T03:54:44-afc480b/aix-ppc64
@Helflym Helflym mentioned this issue Apr 9, 2020
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