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net: don't crash DNS flood test on darwin

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Also renames the test function to TestDNSFlood.

Updates #15659.

Change-Id: Ia562004c43bcc19c2fee9440321c27b591f85da5
Reviewed-on: https://go-review.googlesource.com/23077
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Mikio Hara 2016-05-13 12:13:00 +09:00
parent da5ac69bd4
commit 82ec4cd79f
1 changed files with 13 additions and 2 deletions
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15
src/net/lookup_test.go
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@ -371,12 +371,23 @@ func TestReverseAddress(t *testing.T) {
}
}
func TestLookupIPDeadline(t *testing.T) {
func TestDNSFlood(t *testing.T) {
if !*testDNSFlood {
t.Skip("test disabled; use -dnsflood to enable")
}
const N = 5000
var N = 5000
if runtime.GOOS == "darwin" {
// On Darwin this test consumes kernel threads much
// than other platforms for some reason.
// When we monitor the number of allocated Ms by
// observing on runtime.newm calls, we can see that it
// easily reaches the per process ceiling
// kern.num_threads when CGO_ENABLED=1 and
// GODEBUG=netdns=go.
N = 500
}
const timeout = 3 * time.Second
ctxHalfTimeout, cancel := context.WithTimeout(context.Background(), timeout/2)
defer cancel()