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rhysh opened this issue Aug 26, 2016 · 4 comments
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runtime/trace, cmd/trace: include CPU profile samples #16895

rhysh opened this issue Aug 26, 2016 · 4 comments
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compiler/runtime Issues related to the Go compiler and/or runtime. FeatureRequest Issues asking for a new feature that does not need a proposal. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@rhysh
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rhysh commented Aug 26, 2016

The trace viewer UI provides a mechanism for displaying CPU profile stack samples.

Access to that data inline with other execution trace data—seeing what functions are being executed by goroutines that run for a surprisingly long time—would have been very helpful for diagnosing bugs like #14812, #16293, and #16432. Though the time for those specific bugs may have passed, I think that Go and its users will encounter similar bugs in the future (either in the runtime or in user code).
@quentinmit quentinmit added this to the Go1.8Maybe milestone Sep 6, 2016
@quentinmit quentinmit added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 11, 2016
@rsc
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rsc commented Nov 2, 2016

@aclements, this is what confused me!

@rsc rsc modified the milestones: Go1.9, Go1.8Maybe Nov 2, 2016
@rhysh rhysh mentioned this issue Nov 8, 2016
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@bradfitz bradfitz added the FeatureRequest Issues asking for a new feature that does not need a proposal. label Jun 7, 2017
@bradfitz bradfitz modified the milestones: Go1.10, Go1.9 Jun 7, 2017
@aclements aclements mentioned this issue Nov 9, 2017
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@rsc rsc modified the milestones: Go1.10, Unplanned Nov 29, 2017
@gopherbot
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Change https://go.dev/cl/400795 mentions this issue: runtime: add CPU samples to execution trace

gopherbot pushed a commit that referenced this issue May 3, 2022
@rhysh @mknyszek
runtime: add CPU samples to execution trace
2c0a988 
When the CPU profiler and execution tracer are both active, report the
CPU profile samples in the execution trace data stream.

Include only samples that arrive on the threads known to the runtime,
but include them even when running g0 (such as near the scheduler) or if
there's no P (such as near syscalls).

Render them in "go tool trace" as instantaneous events.

For #16895

Change-Id: I0aa501a7b450c971e510961c0290838729033f7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/400795
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Rhys Hiltner <rhys@justin.tv>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
@gopherbot gopherbot added the compiler/runtime Issues related to the Go compiler and/or runtime. label Jul 7, 2022
@aclements
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@rhysh , should this issue be closed now? Your CL just said "For", but as far as I can tell, there's nothing more to do here. (Thank you so much for adding this!)

@rhysh
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rhysh commented Aug 15, 2022

Yes! There are places to improve (some day), but those can get new issues.

@rhysh rhysh closed this as completed Aug 15, 2022
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compiler/runtime Issues related to the Go compiler and/or runtime. FeatureRequest Issues asking for a new feature that does not need a proposal. FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@bradfitz @rsc @quentinmit @rhysh @aclements @gopherbot