go allocs 源码

  • 2022-07-15
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golang allocs 代码


// Copyright 2013 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 testing

import (

// AllocsPerRun returns the average number of allocations during calls to f.
// Although the return value has type float64, it will always be an integral value.
// To compute the number of allocations, the function will first be run once as
// a warm-up. The average number of allocations over the specified number of
// runs will then be measured and returned.
// AllocsPerRun sets GOMAXPROCS to 1 during its measurement and will restore
// it before returning.
func AllocsPerRun(runs int, f func()) (avg float64) {
	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))

	// Warm up the function

	// Measure the starting statistics
	var memstats runtime.MemStats
	mallocs := 0 - memstats.Mallocs

	// Run the function the specified number of times
	for i := 0; i < runs; i++ {

	// Read the final statistics
	mallocs += memstats.Mallocs

	// Average the mallocs over the runs (not counting the warm-up).
	// We are forced to return a float64 because the API is silly, but do
	// the division as integers so we can ask if AllocsPerRun()==1
	// instead of AllocsPerRun()<2.
	return float64(mallocs / uint64(runs))


go 源码目录


go allocs_test 源码

go benchmark 源码

go benchmark_test 源码

go cover 源码

go example 源码

go export_test 源码

go fuzz 源码

go helper_test 源码

go helperfuncs_test 源码

go match 源码