From dc66b1dd1e513311c16cee398278fa2b6883de7c Mon Sep 17 00:00:00 2001
From: gmallard <allard.guy.m@gmail.com>
Date: Sat, 8 Mar 2014 12:31:30 -0500
Subject: [PATCH] Demo generate a CPU profile.

---
 Makefile             |  1 +
 runpprof/runpprof.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 runpprof/runpprof.go

diff --git a/Makefile b/Makefile
index 831d7f5..f218c50 100644
--- a/Makefile
+++ b/Makefile
@@ -69,6 +69,7 @@ dirs = 	testppack \
 	rangecopy \
 	ranges \
 	recover \
+	runpprof \
 	shax \
 	shifter \
 	show64 \
diff --git a/runpprof/runpprof.go b/runpprof/runpprof.go
new file mode 100644
index 0000000..331acb0
--- /dev/null
+++ b/runpprof/runpprof.go
@@ -0,0 +1,43 @@
+/*
+Demo generating a CPU profile.
+*/
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime/pprof"
+	"time"
+)
+
+func runner() {
+	for i := 0; i < 1000000000; i++ {
+		for j := 0; j < 30; j++ { //
+			_ = i + j
+		}
+	}
+}
+
+func main() {
+	s := time.Now()
+	fmt.Println("Start", s)
+	//
+	f, err := os.Create("./cpu.prof")
+	if err != nil {
+		panic(err)
+	}
+	err = pprof.StartCPUProfile(f)
+	if err != nil {
+		panic(err)
+	}
+	runner()
+	pprof.StopCPUProfile()
+	//
+	err = f.Close()
+	if err != nil {
+		panic(err)
+	}
+	e := time.Now()
+	fmt.Println("End", s)
+	fmt.Println("Elapsed", e.Sub(s))
+}