Add run time cpu count.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

gorush.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log"
 	"os"
+	"runtime"
 	"strconv"
 
 	"github.com/appleboy/gorush/config"
@@ -82,6 +83,10 @@ func createPIDFile() error {
 	return nil
 }
 
+func init() {
+	runtime.GOMAXPROCS(runtime.NumCPU())
+}
+
 func main() {
 	opts := config.ConfYaml{}