runtime: tests are slow

[rasky]

Runtime tests are the slowest on my laptop, and contribute in a non trivial way to the total time of all.bash. go test -v runtime takes 169s (tip, darwin/amd64).

These are all tests that take more than 1 second:

--- PASS: TestChanSendSelectBarrier (7.20s)
--- PASS: TestChanSendBarrier (6.55s)
--- PASS: TestCgoSignalDeadlock (5.70s)
--- PASS: TestFastLog2 (4.81s)
--- PASS: TestSmhasherSmallKeys (6.61s)
--- PASS: TestSmhasherZeros (1.46s)
--- PASS: TestSmhasherTwoNonzero (17.23s)
--- PASS: TestSmhasherCyclic (3.46s)
--- PASS: TestSmhasherSparse (8.27s)
--- PASS: TestSmhasherPermutation (19.04s)
--- PASS: TestSmhasherAvalanche (19.62s)
--- PASS: TestSmhasherWindowed (22.87s)
--- PASS: TestSmhasherText (5.04s)
--- PASS: TestCollisions (1.29s)
--- PASS: TestAsyncPreempt (1.05s)
--- PASS: TestSchedLocalQueueEmpty (1.29s)
--- PASS: TestPreemptionAfterSyscall (1.01s)
--- PASS: TestGoroutineProfile (1.11s)
--- PASS: TestStackMem (3.57s)
--- PASS: TestStackGrowth (2.54s)
--- PASS: TestDeferHeapAndStack (4.02s)
--- PASS: TestCgoNumGoroutine (6.81s)
--- PASS: TestCgoTracebackContext (6.81s)
--- PASS: TestCgoCrashTraceback (6.80s)
--- PASS: TestDeferKeepAlive (1.04s)
--- PASS: TestCgoCCodeSIGPROF (1.24s)
--- PASS: TestMemmoveAlias (2.60s)
--- PASS: TestMemmoveLarge0x180000 (4.03s)
--- PASS: TestMemmove (1.66s)
--- PASS: TestMemmoveOverlapLarge0x120000 (6.99s)
--- PASS: TestCgoExternalThreadSignal (6.69s)
--- PASS: TestCgoExternalThreadSIGPROF (4.01s)
--- PASS: TestVDSO (1.15s)
--- PASS: TestFakeTime (2.49s)

I think it would be great to look into them and try to reduce them.

[ianlancetaylor]

Is this with or without -test.short? Note that all.bash and run.bash use -test.short.

[rasky]

Ah you're right. Let me close this, maybe I'll open a different one then.