runtime/trace: flight recording

// This program demonstrates the current trace API.  The new FlightRecorder
// type is not yet available in Go 1.27.1, so we use the standard trace.Start
// and trace.Stop functions instead.

package main

import (
	"fmt"
	"os"
	"time"

	"runtime/trace"
)

func main() {
	// Open a file to write the trace data.
	f, err := os.Create("trace.out")
	if err != nil {
		fmt.Println("could not create trace file:", err)
		return
	}
	defer f.Close()

	// Start tracing.  The trace will capture all events until Stop is called.
	if err := trace.Start(f); err != nil {
		fmt.Println("could not start trace:", err)
		return
	}
	defer trace.Stop()

	// Simulate some work.
	time.Sleep(2 * time.Second)

	// The trace data is written to trace.out when Stop is called.
	fmt.Println("trace written to trace.out")
}