package main

import (
  "net/http"
  "runtime"
)

func main() {
  runtime.GOMAXPROCS(runtime.NumCPU())
  handler := func(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("hello world\n"))
  }
  http.ListenAndServe(":8000", http.HandlerFunc(handler))
}