1 // Copyright 2023 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // Package benchmarks contains benchmarks for slog. 6 // 7 // These benchmarks are loosely based on github.com/uber-go/zap/benchmarks. 8 // They have the following desirable properties: 9 // 10 // - They test a complete log event, from the user's call to its return. 11 // 12 // - The benchmarked code is run concurrently in multiple goroutines, to 13 // better simulate a real server (the most common environment for structured 14 // logs). 15 // 16 // - Some handlers are optimistic versions of real handlers, doing real-world 17 // tasks as fast as possible (and sometimes faster, in that an 18 // implementation may not be concurrency-safe). This gives us an upper bound 19 // on handler performance, so we can evaluate the (handler-independent) core 20 // activity of the package in an end-to-end context without concern that a 21 // slow handler implementation is skewing the results. 22 // 23 // - We also test the built-in handlers, for comparison. 24 package benchmarks 25 26 import ( 27 "errors" 28 "log/slog" 29 "time" 30 ) 31 32 const testMessage = "Test logging, but use a somewhat realistic message length." 33 34 var ( 35 testTime = time.Date(2022, time.May, 1, 0, 0, 0, 0, time.UTC) 36 testString = "7e3b3b2aaeff56a7108fe11e154200dd/7819479873059528190" 37 testInt = 32768 38 testDuration = 23 * time.Second 39 testError = errors.New("fail") 40 ) 41 42 var testAttrs = []slog.Attr{ 43 slog.String("string", testString), 44 slog.Int("status", testInt), 45 slog.Duration("duration", testDuration), 46 slog.Time("time", testTime), 47 slog.Any("error", testError), 48 } 49 50 const wantText = "time=1651363200 level=0 msg=Test logging, but use a somewhat realistic message length. string=7e3b3b2aaeff56a7108fe11e154200dd/7819479873059528190 status=32768 duration=23000000000 time=1651363200 error=fail\n" 51