| // Copyright 2018 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main_test |
| |
| import ( |
| "internal/testenv" |
| "os/exec" |
| "testing" |
| ) |
| |
| // BenchmarkExecGoEnv measures how long it takes for 'go env GOARCH' to run. |
| // Since 'go' is executed, remember to run 'go install cmd/go' before running |
| // the benchmark if any changes were done. |
| func BenchmarkExecGoEnv(b *testing.B) { |
| testenv.MustHaveExec(b) |
| b.StopTimer() |
| gotool, err := testenv.GoTool() |
| if err != nil { |
| b.Fatal(err) |
| } |
| for i := 0; i < b.N; i++ { |
| cmd := exec.Command(gotool, "env", "GOARCH") |
| |
| b.StartTimer() |
| err := cmd.Run() |
| b.StopTimer() |
| |
| if err != nil { |
| b.Fatal(err) |
| } |
| } |
| } |