Golang : Get number of CPU cores

Problem :

You want to find the maximum number of CPU cores to maximize performance.

Solution :

Use the runtime package to find out the number of CPU cores available on local machine.

 package main

 import (
 "fmt"
 "runtime"
 )

 func main() {

 cores := runtime.NumCPU()

 fmt.Printf("This machine has %d CPU cores. \n", cores)

 // maximize CPU usage for maximum performance
 runtime.GOMAXPROCS(cores)

 }

Reference :

http://golang.org/pkg/runtime/#NumCPU