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The Go Programming Language
book

The Go Programming Language

by Alan A. A. Donovan, Brian W. Kernighan
October 2015
Beginner to intermediate content levelBeginner to intermediate
400 pages
14h 44m
English
Addison-Wesley Professional
Content preview from The Go Programming Language

11.4 Benchmark Functions

Benchmarking is the practice of measuring the performance of a program on a fixed workload. In Go, a benchmark function looks like a test function, but with the Benchmark prefix and a *testing.B parameter that provides most of the same methods as a *testing.T, plus a few extra related to performance measurement. It also exposes an integer field N, which specifies the number of times to perform the operation being measured.

Here’s a benchmark for IsPalindrome that calls it N times in a loop.

import "testing"

func BenchmarkIsPalindrome(b *testing.B) {
    for i := 0; i < b.N; i++ {
        IsPalindrome("A man, a plan, a canal: Panama")
    }
}

We run it with the command below. Unlike tests, by default ...

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Publisher Resources

ISBN: 9780134190570Purchase book