# perf record -p 14942
^C[ perf record: Woken up 5 times to write data ]
[ perf record: Captured and wrote 1.396 MB perf.data (36172 samples) ]

# perf report

package main
func main() {
     demo()
}
func demo(){
      for {
             sum:=0
             for i:=0;i<=1000000;i++ {
                    sum+=i
              }
       }
}