runtime: TestChanSend* tests take a very long time to run on linux/arm

[davecheney]

$ env GOMAXPROCS=2 go test runtime -test.timeout=600m -test.v -test.run=Chan.*Barrier -cpu=1,2,
4
=== RUN   TestChanSendSelectBarrier
--- PASS: TestChanSendSelectBarrier (326.72s)
=== RUN   TestChanSendBarrier
--- PASS: TestChanSendBarrier (265.04s)
=== RUN   TestChanSendSelectBarrier
--- PASS: TestChanSendSelectBarrier (177.68s)
=== RUN   TestChanSendBarrier
x^[[A^[[A^[[A^[[B^[[A^[[B--- PASS: TestChanSendBarrier (146.90s)
=== RUN   TestChanSendSelectBarrier
--- PASS: TestChanSendSelectBarrier (100.52s)
=== RUN   TestChanSendBarrier
--- PASS: TestChanSendBarrier (86.06s)
PASS
ok      runtime 1103.144s

This is on a Raspberry Pi 2 (ARMv7) system

[davecheney]

Here are the results from a different ARMv7 system (just to rule out the Raspberry Pi)

[root@alarm src]# env GOMAXPROCS=2 go test runtime -test.timeout=600m -test.v -test.run=Chan.*Barrier -cpu=1,2,4
=== RUN   TestChanSendSelectBarrier
--- PASS: TestChanSendSelectBarrier (172.17s)
=== RUN   TestChanSendBarrier
--- PASS: TestChanSendBarrier (144.81s)
=== RUN   TestChanSendSelectBarrier
--- PASS: TestChanSendSelectBarrier (92.95s)
=== RUN   TestChanSendBarrier
--- PASS: TestChanSendBarrier (80.27s)
=== RUN   TestChanSendSelectBarrier
--- PASS: TestChanSendSelectBarrier (56.35s)
=== RUN   TestChanSendBarrier
--- PASS: TestChanSendBarrier (49.65s)
PASS
ok      runtime 596.294s

[davecheney]

This was a mistake, under ./run.bash this test is run in -short mode which runs very quickly.