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// Copyright 2023 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. // Tests increasing and decreasing GOMAXPROCS to try and // catch issues with stale proc state. //go:build ignore package main import ( "log" "os" "runtime" "runtime/trace" "time" ) func main() { // Start a goroutine that calls runtime.GC to try and // introduce some interesting events in between the // GOMAXPROCS calls. go func() { for { runtime.GC() time.Sleep(1 * time.Millisecond) } }() // Start tracing. if err := trace.Start(os.Stdout); err != nil { log.Fatalf("failed to start tracing: %v", err) } // Run GOMAXPROCS a bunch of times, up and down. for i := 1; i <= 16; i *= 2 { runtime.GOMAXPROCS(i) time.Sleep(1 * time.Millisecond) } for i := 16; i >= 1; i /= 2 { runtime.GOMAXPROCS(i) time.Sleep(1 * time.Millisecond) } // Stop tracing. trace.Stop() }
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