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runtime: TestPingPongHog fails in race mode #38266

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josharian opened this issue Apr 5, 2020 · 3 comments
Closed

runtime: TestPingPongHog fails in race mode #38266

josharian opened this issue Apr 5, 2020 · 3 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@josharian
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$ go test -race -run=TestPingPongHog runtime
--- FAIL: TestPingPongHog (0.16s)
    proc_test.go:471: want hogCount/lightCount in [0.2, 5]; got 8000000/481000 = 16.632016632016633
FAIL
FAIL	runtime	0.458s
FAIL

Perhaps it should just be skipped in -race mode?

@gopherbot
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Change https://golang.org/cl/227163 mentions this issue: cmd/compile,runtime: pass only ptr and len to some runtime calls

@gopherbot
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Change https://golang.org/cl/227344 mentions this issue: runtime: skip TestPingPongHog in race mode

@andybons andybons added the NeedsFix The path to resolution is known, but the work has not been done. label Apr 6, 2020
@andybons andybons added this to the Go1.15 milestone Apr 6, 2020
@andybons andybons added Testing An issue that has been verified to require only test changes, not just a test failure. and removed Testing An issue that has been verified to require only test changes, not just a test failure. labels Apr 6, 2020
gopherbot pushed a commit that referenced this issue Apr 8, 2020
Some runtime calls accept a slice, but only use ptr and len.
This change modifies most such routines to accept only ptr and len.

After this change, the only runtime calls that accept an unnecessary
cap arg are concatstrings and slicerunetostring.
Neither is particularly common, and both are complicated to modify.

Negligible compiler performance impact. Shrinks binaries a little.
There are only a few regressions; the one I investigated was
due to register allocation fluctuation.

Passes 'go test -race std cmd', modulo #38265 and #38266.
Wow, does that take a long time to run.

Updates #36890

file      before    after     Δ       %       
compile   19655024  19655152  +128    +0.001% 
cover     5244840   5236648   -8192   -0.156% 
dist      3662376   3658280   -4096   -0.112% 
link      6680056   6675960   -4096   -0.061% 
pprof     14789844  14777556  -12288  -0.083% 
test2json 2824744   2820648   -4096   -0.145% 
trace     11647876  11639684  -8192   -0.070% 
vet       8260472   8256376   -4096   -0.050% 
total     115163736 115118808 -44928  -0.039% 

Change-Id: Idb29fa6a81d6a82bfd3b65740b98cf3275ca0a78
Reviewed-on: https://go-review.googlesource.com/c/go/+/227163
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
@gopherbot
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Change https://golang.org/cl/245099 mentions this issue: compiler,runtime: pass only ptr and len to some runtime calls

gopherbot pushed a commit to golang/gofrontend that referenced this issue Jul 28, 2020
This ports https://golang.org/cl/227163 to the Go frontend.
This is a step toward moving up to the go1.15rc1 release.

Original CL description:

    cmd/compile,runtime: pass only ptr and len to some runtime calls

    Some runtime calls accept a slice, but only use ptr and len.
    This change modifies most such routines to accept only ptr and len.

    After this change, the only runtime calls that accept an unnecessary
    cap arg are concatstrings and slicerunetostring.
    Neither is particularly common, and both are complicated to modify.

    Negligible compiler performance impact. Shrinks binaries a little.
    There are only a few regressions; the one I investigated was
    due to register allocation fluctuation.

    Passes 'go test -race std cmd', modulo golang/go#38265 and golang/go#38266.
    Wow, does that take a long time to run.

    file      before    after     Δ       %
    compile   19655024  19655152  +128    +0.001%
    cover     5244840   5236648   -8192   -0.156%
    dist      3662376   3658280   -4096   -0.112%
    link      6680056   6675960   -4096   -0.061%
    pprof     14789844  14777556  -12288  -0.083%
    test2json 2824744   2820648   -4096   -0.145%
    trace     11647876  11639684  -8192   -0.070%
    vet       8260472   8256376   -4096   -0.050%
    total     115163736 115118808 -44928  -0.039%

For golang/go#36890

Change-Id: I1dc1424ccb092a9ad70472e560a743c35dd27bfc
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245099
Reviewed-by: Cherry Zhang <cherryyz@google.com>
jpf91 pushed a commit to D-Programming-GDC/gcc that referenced this issue Jul 28, 2020
This ports https://golang.org/cl/227163 to the Go frontend.
This is a step toward moving up to the go1.15rc1 release.

Original CL description:

    cmd/compile,runtime: pass only ptr and len to some runtime calls

    Some runtime calls accept a slice, but only use ptr and len.
    This change modifies most such routines to accept only ptr and len.

    After this change, the only runtime calls that accept an unnecessary
    cap arg are concatstrings and slicerunetostring.
    Neither is particularly common, and both are complicated to modify.

    Negligible compiler performance impact. Shrinks binaries a little.
    There are only a few regressions; the one I investigated was
    due to register allocation fluctuation.

    Passes 'go test -race std cmd', modulo golang/go#38265 and golang/go#38266.
    Wow, does that take a long time to run.

    file      before    after     Δ       %
    compile   19655024  19655152  +128    +0.001%
    cover     5244840   5236648   -8192   -0.156%
    dist      3662376   3658280   -4096   -0.112%
    link      6680056   6675960   -4096   -0.061%
    pprof     14789844  14777556  -12288  -0.083%
    test2json 2824744   2820648   -4096   -0.145%
    trace     11647876  11639684  -8192   -0.070%
    vet       8260472   8256376   -4096   -0.050%
    total     115163736 115118808 -44928  -0.039%

For golang/go#36890

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/245099
@golang golang locked and limited conversation to collaborators Jul 27, 2021
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