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Michael Pratt d1640d8652 runtime/pprof: compare all samples vs rusage in TestCPUProfileMultithreadMagnitude 
TestCPUProfileMultithreadMagnitude compares pprof results vs OS rusage
to verify that pprof is capturing all CPU usage. Presently it compares
the sum of cpuHog1 samples vs rusage. However, background usage from the
scheduler, GC, etc can cause additional CPU usage causing test failures
if rusage is too far off from the cpuHog1 samples.

That said, this test doesn't actually need to care about cpuHog1
samples. It simply cares that pprof samples match rusage, not what the
breakdown of usage was. As a result, we can compare the sum of _all_
pprof samples vs rusage, which should implicitly include any background
CPU usage.

Fixes #50097.

Change-Id: I649a18de5b3dcf58b62be5962fa508d14cd4dc79
Reviewed-on: https://go-review.googlesource.com/c/go/+/379535
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
2022-01-19 20:07:20 +00:00
.github .github: remove duplicate security link 2022-01-07 17:55:09 +00:00
api api: promote next to go1.18 2021-12-14 17:43:51 +00:00
doc spec: add another example for an invalid shift case 2022-01-19 04:00:05 +00:00
lib/time lib/time, time/tzdata: update to 2021e 2021-11-11 05:16:39 +00:00
misc src/runtime: mark asanread and asanwrite functions as NOSPLIT 2022-01-05 09:50:29 +00:00
src runtime/pprof: compare all samples vs rusage in TestCPUProfileMultithreadMagnitude 2022-01-19 20:07:20 +00:00
test cmd/compile: don't elide extension for LoadReg to FP register on MIPS64 2022-01-19 15:45:58 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
AUTHORS A+C: add Bharath Kumar Uppala (individual CLA) 2021-11-29 00:57:09 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add Bharath Kumar Uppala (individual CLA) 2021-11-29 00:57:09 +00:00
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README.md README.md: update contribute URL 2021-09-30 13:33:21 +00:00
SECURITY.md SECURITY.md: update go versions 2019-09-26 15:34:57 +00:00

README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.