mac:~ yoshidakeiji$ wrk -t12 -c400 -d2s http://127.0.0.1:8080
Running 2s test @ http://127.0.0.1:8080
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     7.71ms    3.16ms  23.05ms   69.17%
    Req/Sec     3.44k     1.98k    7.80k    58.22%
  63697 requests in 2.00s, 17.86MB read
  Socket errors: connect 155, read 47, write 0, timeout 66
Requests/sec:  31780.82
Transfer/sec:      8.91MB

main.go

package main

import (
	"log"
	"net/http"
)

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {

	})
	if err := http.ListenAndServe(":8080", nil); err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}

mac:~ yoshidakeiji$ GOMAXPROCS=2 go run main.go
mac:~ yoshidakeiji$ wrk -t12 -c400 -d2s http://127.0.0.1:8080
Running 2s test @ http://127.0.0.1:8080
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     3.79ms  492.55us   7.85ms   76.02%
    Req/Sec     6.63k     2.47k   13.10k    60.47%
  124846 requests in 2.00s, 13.81MB read
  Socket errors: connect 155, read 50, write 0, timeout 66
Requests/sec:  62314.54
Transfer/sec:      6.89MB

main.go

package main

import (
	"fmt"
	"log"
	"net/http"
)

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprint(w, "Hello")
	})
	if err := http.ListenAndServe(":8080", nil); err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}

mac:~ yoshidakeiji$ GOMAXPROCS=2 go run main.go
mac:~ yoshidakeiji$ wrk -t12 -c400 -d2s http://127.0.0.1:8080
Running 2s test @ http://127.0.0.1:8080
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     3.79ms  492.55us   7.85ms   76.02%
    Req/Sec     6.63k     2.47k   13.10k    60.47%
  124846 requests in 2.00s, 13.81MB read
  Socket errors: connect 155, read 50, write 0, timeout 66
Requests/sec:  62314.54
Transfer/sec:      6.89MB
mac:~ yoshidakeiji$ wrk -t12 -c400 -d2s http://127.0.0.1:8080
Running 2s test @ http://127.0.0.1:8080
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     3.87ms  725.83us  13.10ms   84.56%
    Req/Sec     6.50k     3.06k   23.70k    60.89%
  121878 requests in 2.00s, 14.06MB read
  Socket errors: connect 155, read 54, write 0, timeout 66
Requests/sec:  60837.67
Transfer/sec:      7.02MB

main.go

package main

import (
	"log"
	"net/http"
)

func main() {
	http.Handle("/", http.FileServer(http.Dir("/Users/yoshidakeiji/www")))
	if err := http.ListenAndServe(":8080", nil); err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}

mac:~ yoshidakeiji$ GOMAXPROCS=2 go run main.go
mac:~ yoshidakeiji$ wrk -t12 -c400 -d2s http://127.0.0.1:8080
Running 2s test @ http://127.0.0.1:8080
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    14.86ms    1.52ms  19.52ms   74.31%
    Req/Sec     1.65k   795.40     2.53k    69.16%
  32254 requests in 2.00s, 7.47MB read
  Socket errors: connect 155, read 0, write 0, timeout 66
Requests/sec:  16088.43
Transfer/sec:      3.73MB