os: skip TestPipeThreads on aix

This tests fails sporadically on the aix-ppc64 CI. I suspect this is
an aix performance related issue. Skip the test.

AIX seems slow to perform a non-blocking reading on a pipe, and this
results in too many threads being created. This happens as far back
as go1.22, where I stopped looking.

On the GCC farm machine gcc119, The failure rate seemed coupled to
GOMAXPROCS; about 1% for <=8, up to 40%+ for >=30 for all releases
tested.

For #70131

Change-Id: If002b55e5a4586d10cc7876d7c25259e61b17163
Reviewed-on: https://go-review.googlesource.com/c/go/+/623817
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Paul Murphy <murp@ibm.com>
Auto-Submit: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

diff --git a/src/os/os_test.go b/src/os/os_test.go
index 5b1c8ba2f0ec28388bb7922c6fbfeb0796a8f6e3..4470acd83b46cf41e908c6c9629942fdc070ee3e 100644 (file)
--- a/src/os/os_test.go
+++ b/src/os/os_test.go
@@ -2626,6 +2626,8 @@ func TestRemoveAllRace(t *testing.T) {
 // Test that reading from a pipe doesn't use up a thread.
 func TestPipeThreads(t *testing.T) {
        switch runtime.GOOS {
+       case "aix":
+               t.Skip("skipping on aix; issue 70131")
        case "illumos", "solaris":
                t.Skip("skipping on Solaris and illumos; issue 19111")
        case "windows":