"-m -m" shows as: _*value of map put*_ func BenchmarkMap(b *testing.B) { for i := 0; i < b.N; i++ { c := new(click) m := make(map[string]*click, 0) m["foo"] = c } } slice In the out of -gc ags "-m -m" shows as: *slice-element-equals* func BenchmarkSlice(b *testing.B) { for i := 0; i < b.N; i++ { c := new(click) s := make([]*click, 1) s[0] = c } }