云发购 Go 同步发HTTP请求是不是要比Python慢很多?

云发购App邀请码「51117676」

Go 新手,最近想测试下用Go 发HTTP的速度,所以就写了个脚本测试了下,同时发两个请求,跟Python对比了下,发现慢了很多, Python 使用aiohttp耗时0.14s,Go版本的耗时 0.29s,慢了2倍

按理讲如果Go的速度不快的话,那至少也是跟Python差不多的嘛, 为什么会差这么多,是我写的方式不对吗?求指教。

Go 和 Python 代码如下:

import time
import aiohttp
import asyncio

async def fetch(session, url):
async with session.post(url) as response:
return await response.text()

async def main(url):
async with aiohttp.ClientSession() as session:
html = await fetch(session, url)
return html

if name == 'main':
t = time.time()
loop = asyncio.get_event_loop()
urls = [
"https://sina.com.cn",
"https://news.baidu.com"
]
tasks = [main(url) for url in urls]
responses = loop.run_until_complete(asyncio.gather(*tasks))

for response in responses:
 print(response)
print(time.time() - t)

package main

import (
"fmt"
"io/ioutil"
"net/http"
"time"
)

func MakeRequest(client http.Client, url string, ch chan<- string) {
reqest, _ := http.NewRequest("GET", url, nil)

response, _ := client.Do(reqest)
body, _ := ioutil.ReadAll(response.Body)
ch <- string(body)

}

func main() {
start := time.Now()
urls := []string{"https://sina.com.cn", "https://news.baidu.com"}
client := &http.Client{}
ch := make(chan string)
for _, url := range urls {
go MakeRequest(*client, url, ch)
}

for range urls {
 fmt.Println(<-ch)
}
fmt.Printf("%.8fs elapsed\n", time.Since(start).Seconds())

}
第 1 条附言 · 2018年07月04日 15:22:29
使用buffered channel,不过还是比Python慢

package main

import (
"fmt"
"io/ioutil"
"net/http"
"time"
)

func MakeRequest(client http.Client, url string, ch chan<- string) {
reqest, _ := http.NewRequest("GET", url, nil)

response, _ := client.Do(reqest)
body, _ := ioutil.ReadAll(response.Body)
ch <- string(body)

}

func main() {
start := time.Now()
urls := []string{"https://sina.com.cn", "https://news.baidu.com"}
client := &http.Client{}
ch := make(chan string, len(urls))
for _, url := range urls {
go MakeRequest(*client, url, ch)
}

for range urls {
 fmt.Println(<-ch)
}
fmt.Printf("%.8fs elapsed\n", time.Since(start).Seconds())

}

本文来自:51CTO博客

感谢作者:云发G25295678

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