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Source file src/context/benchmark_test.go

Documentation: context

  // Copyright 2014 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 context_test
  
  import (
  	. "context"
  	"fmt"
  	"testing"
  )
  
  func BenchmarkContextCancelTree(b *testing.B) {
  	depths := []int{1, 10, 100, 1000}
  	for _, d := range depths {
  		b.Run(fmt.Sprintf("depth=%d", d), func(b *testing.B) {
  			b.Run("Root=Background", func(b *testing.B) {
  				for i := 0; i < b.N; i++ {
  					buildContextTree(Background(), d)
  				}
  			})
  			b.Run("Root=OpenCanceler", func(b *testing.B) {
  				for i := 0; i < b.N; i++ {
  					ctx, cancel := WithCancel(Background())
  					buildContextTree(ctx, d)
  					cancel()
  				}
  			})
  			b.Run("Root=ClosedCanceler", func(b *testing.B) {
  				for i := 0; i < b.N; i++ {
  					ctx, cancel := WithCancel(Background())
  					cancel()
  					buildContextTree(ctx, d)
  				}
  			})
  		})
  	}
  }
  
  func buildContextTree(root Context, depth int) {
  	for d := 0; d < depth; d++ {
  		root, _ = WithCancel(root)
  	}
  }
  

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