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trace.go
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/
trace.go
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// Copyright © 2016, 2022 Yoshiki Shibata. All rights reserved.
package main
import (
"flag"
"fmt"
"log"
"os"
"path/filepath"
"runtime/trace"
)
var traceFile string
var traceFlag *bool
func init() {
cwd := getCWD()
traceFile = cwd + PS + "oak.trace.out"
traceFlag = flag.Bool("trace", false, fmt.Sprintf("produce profile as %q", traceFile))
}
func startTrace() *os.File {
if !*traceFlag {
return nil
}
profFile, err := os.Create(traceFile)
if err != nil {
log.Fatal("could not create trace file:", err)
exit(err, 1)
}
err = trace.Start(profFile)
if err != nil {
log.Fatalf("trace.Start failed: %v", err)
}
return profFile
}
func stopTrace(f *os.File) {
if f == nil {
return
}
trace.Stop()
f.Close()
fmt.Printf("Trace is stored as %q.\n", filepath.Base(traceFile))
fmt.Printf("To view the file, run the following command:\n")
fmt.Printf("\tgo tool trace %s\n\n", filepath.Base(traceFile))
}