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runtime: tests have gotten slower #48770

josharian opened this issue Oct 4, 2021 · 2 comments

runtime: tests have gotten slower #48770

josharian opened this issue Oct 4, 2021 · 2 comments


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@josharian josharian commented Oct 4, 2021

I've noticed running all.bash recently that the runtime tests are really slow and CPU intensive.

On my M1, I tried doing cd $GOROOT/runtime; go test -c; ./runtime.test -test.short with recent Go versions. The runtime tests now take almost 3x longer than 1.17.

  • Go 1.16: 6.46 real 7.76 user 2.52 sys
  • Go 1.17: 7.39 real 8.40 user 2.48 sys
  • Tip, Oct 4 '21 (9432320): 20.03 real 25.64 user 6.26 sys

The slowest at tip are:

0.50s TestCgoCrashHandler
0.58s TestCgoExternalThreadSignal
0.67s TestCgoSignalDeadlock
0.71s TestCheckPtr2
0.72s TestCgoExternalThreadSIGPROF
0.77s TestEINTR
1.00s TestCheckPtr/CheckPtrAlignmentNilPtr
1.00s TestDeferKeepAlive
1.01s TestSpuriousWakeupsNeverHangSemasleep
1.13s TestVDSO
1.38s TestCgoCCodeSIGPROF

Perhaps some of these could be shortened, skipped, or marked parallel?

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@cuonglm cuonglm commented Oct 4, 2021

Maybe related #48496

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@josharian josharian commented Oct 4, 2021

Ouch. Yes, quite possibly!

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