github.com/andy-kimball/arenaskl@v0.0.0-20200617143215-f701008588b9/internal/fastrand/fastrand_test.go (about) 1 /* 2 * Copyright 2017 Dgraph Labs, Inc. and Contributors 3 * Modifications copyright (C) 2020 Andy Kimball and Contributors 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package fastrand 19 20 import ( 21 "math/rand" 22 "testing" 23 ) 24 25 // Results with go1.13.12 on a Mac with a 2.3 GHz 8-Core Intel Core i9 processor: 26 // 27 // $ go test -cpu 1,2,4,8,16,32 -bench=. -count=1 | benchstat /dev/stdin 28 // 29 // name time/op 30 // FastRand 2.25ns ± 2% 31 // FastRand-2 1.14ns ± 3% 32 // FastRand-4 0.59ns ± 4% 33 // FastRand-8 0.35ns ± 6% 34 // FastRand-16 0.33ns ± 4% 35 // FastRand-32 0.32ns ± 2% 36 // DefaultRand 13.3ns ± 3% 37 // DefaultRand-2 19.2ns ± 3% 38 // DefaultRand-4 41.5ns ± 1% 39 // DefaultRand-8 56.7ns ± 1% 40 // DefaultRand-16 66.6ns ±12% 41 // DefaultRand-32 65.8ns ± 6% 42 // 43 44 func BenchmarkFastRand(b *testing.B) { 45 b.RunParallel(func(pb *testing.PB) { 46 for pb.Next() { 47 Uint32() 48 } 49 }) 50 } 51 52 func BenchmarkDefaultRand(b *testing.B) { 53 b.RunParallel(func(pb *testing.PB) { 54 for pb.Next() { 55 rand.Uint32() 56 } 57 }) 58 }