simple benchmark

gevent_version.py

"""
>>> time python2.7 ./filename.py > /dev/null
real	0m17.911s
user	0m17.059s
sys	0m0.834s

>>> time pypy ./filename.py > /dev/null  # pypy2.2.1  gevent 1.1.0-dev
real	0m14.118s
user	0m9.993s
sys	0m0.787s

"""

from gevent.pool import Pool

SIZE = 655350

pool = Pool(SIZE)

def incr(n):
    print n+1

for i in xrange(SIZE):
    pool.wait_available()
    pool.spawn(incr, i)

pool.join()

go_version.go

package main

/*
>>> go build filename.go
>>> time GOMAXPROCS=1 ./filename > /dev/null
real	0m1.083s
user	0m0.834s
sys	0m0.255s
*/


import (
    "fmt"
    "sync"
)
const (
    SIZE = 655350
)

func incr(num int) {
    fmt.Println(num+1)
}

func main(){
    var wg sync.WaitGroup
    defer wg.Wait()
    wg.Add(SIZE)
    for i:=0; i<SIZE; i++ {
        go func(num int){
            defer wg.Done()
            incr(num)
        }(i)
    }
}