Optimize: buffer stdout for 2-3x speedup

felixge · felixge · commit 69b5fe0cc7da · 2015-01-11T16:33:01.000+01:00
diff --git a/xxd.go b/xxd.go
@@ -18,7 +18,9 @@ func main() {
 		panic(err)
 	}
 	defer f.Close()
-	if err := XXD(f, os.Stdout); err != nil {
+	out := bufio.NewWriter(os.Stdout)
+	defer out.Flush()
+	if err := XXD(f, out); err != nil {
 		panic(err)
 	}
 }

Original file line number	Diff line number	Diff line change
`@@ -18,7 +18,9 @@ func main() {`
`18`	`18`	`panic(err)`
`19`	`19`	`}`
`20`	`20`	`defer f.Close()`
`21`		`- if err := XXD(f, os.Stdout); err != nil {`
	`21`	`+ out := bufio.NewWriter(os.Stdout)`
	`22`	`+ defer out.Flush()`
	`23`	`+ if err := XXD(f, out); err != nil {`
`22`	`24`	`panic(err)`
`23`	`25`	`}`
`24`	`26`	`}`