Hi all,
Sorry if this is an FAQ, but then my Google-foo has failed me. :-/
It seems to me that the test functions in a bla_test.go file influence
the benchmark functions in the same file. In the snippet below, if I
comment out the body of the test function, I get better benchmark
numbers than when I leave it in. Suspecting some GC "leftovers" from
the test, I've tried adding "runtime.GC(); b.ResetTimer()" to the
benchmark but that doesn't actually help.
Before I dig through the source for Go's testing module itself, I
wanted to see if this is a well-known issue, maybe with a well-known
workaround?
Best,
Peter
-----CUT-----
$ go version
go version go1.7.5 linux/amd64
$ cat bla_test.go
package main
import "testing"
import "container/list"
import "runtime"
const size = 2270
func TestPushBack(t *testing.T) {
// /*
var q list.List
for i := 0; i < size; i++ {
q.PushBack(i)
}
for i := 0; q.Len() > 0; i++ {
e := q.Front()
x := e.Value.(int)
q.Remove(e)
if x != i {
t.Errorf("q.PopFront() = %d, want %d", x, i)
}
}
// */
}
func BenchmarkPushBack(b *testing.B) {
runtime.GC()
b.ResetTimer()
for i := 0; i < b.N; i++ {
var q list.List
for n := 0; n < size; n++ {
q.PushBack(n)
}
}
}
$ go test -bench .
BenchmarkPushBack-2 5000 378367 ns/op
PASS
ok X 1.937s
$ go test -bench .
BenchmarkPushBack-2 5000 378196 ns/op
PASS
ok X 1.936s
$ vi bla_test.go # comment out test code
$ go test -bench .
BenchmarkPushBack-2 5000 356310 ns/op
PASS
ok X 1.825s
$ go test -bench .
BenchmarkPushBack-2 5000 354530 ns/op
PASS
ok X 1.816s
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