最近在使用nginx lua redis做一个系统，来支撑高并发高访问量的应用。开发时突然想到golang是不是也可以达到同样的效果。于是写了个简单的代码对比一下。
具体就不多做介绍了，网上很多关于nginx lua redis构建高并发应用的介绍。我使用的是openresty lua redis。
先贴下测试结果，机器就是2013年新出的低配air——（1.3 GHz Intel Core i5， 4 GB 1600 MHz DDR3）, 命令：
ab -n 1000 -c 100 http://localhost:8880/
::
代码语言：javascript复制openresty lua redis:
Concurrency Level: 100
Time taken for tests: 0.458 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 689000 bytes
HTML transferred: 533000 bytes
Requests per second: 2183.67 [#/sec] (mean)
Time per request: 45.794 [ms] (mean)
Time per request: 0.458 [ms] (mean, across all concurrent requests)
Transfer rate: 1469.29 [Kbytes/sec] received::
代码语言：javascript复制golang redis:
Concurrency Level: 100
Time taken for tests: 0.503 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 650000 bytes
HTML transferred: 532000 bytes
Requests per second: 1988.22 [#/sec] (mean)
Time per request: 50.296 [ms] (mean)
Time per request: 0.503 [ms] (mean, across all concurrent requests)
Transfer rate: 1262.05 [Kbytes/sec] receivedlua代码：
.. code:: lua
代码语言：javascript复制-- redis 配置
local params = {
host='127.0.0.1',
port = 6379,
}
local red = redis:new()
local ok, err = red:connect(params.host, params.port)
if not ok then
ngx.say("failed to connect: ", err)
return
end
local position_key = ngx.var.position_key
local content = red:get(position_key)
ngx.print(content)golang代码 ：
.. code:: go
代码语言：javascript复制package main
import (
"fmt"
"github.com/garyburd/redigo/redis"
"log"
"net/http"
"time"
)
func getConn() (redis.Conn, error) {
conn, err := redis.DialTimeout("tcp", ":6379", 0, 1*time.Second, 1*time.Second)
if err != nil {
fmt.Println(err)
}
return conn, err
}
func indexHandler(w http.ResponseWriter, r *http.Request) {
conn, err := getConn()
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
result, err := conn.Do("get", "content_1")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
fmt.Fprintf(w, "Hello, %q", result)
}
func main() {
http.HandleFunc("/", indexHandler)
err := http.ListenAndServe(":8880", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err.Error())
}
}经过多次压测之后发现，nginx lua redis的组合确实高效，golang redis的方案其实也差不了多少。相对于整个系统从开发到部署的方式来说，golang可能更合适，更符合开发的习惯，毕竟nginx lua 这种方案开发和测试都略显别扭。
补充连接池的使用和测试结果
上次测试完之后，觉得这个代码还有提高的空间，于是查了下怎么在golang中使用redis连接池（其实就是redigo的使用），还有lua中怎么使用redis连接池（其实就是rest.redis的使用）。
先上结果::
代码语言：javascript复制openresty lua redis
Concurrency Level: 100
Time taken for tests: 0.284 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 687000 bytes
HTML transferred: 531000 bytes
Requests per second: 3522.03 [#/sec] (mean)
Time per request: 28.393 [ms] (mean)
Time per request: 0.284 [ms] (mean, across all concurrent requests)
Transfer rate: 2362.93 [Kbytes/sec] received再看golang::
代码语言：javascript复制golang redis
Concurrency Level: 100
Time taken for tests: 0.327 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 650000 bytes
HTML transferred: 532000 bytes
Requests per second: 3058.52 [#/sec] (mean)
Time per request: 32.696 [ms] (mean)
Time per request: 0.327 [ms] (mean, across all concurrent requests)
Transfer rate: 1941.44 [Kbytes/sec] receivedlua代码：
.. code:: lua
代码语言：javascript复制-- redis 配置
local params = {
host='127.0.0.1',
port = 6379,
}
local red = redis:new()
local ok, err = red:connect(params.host, params.port)
if not ok then
ngx.say("failed to connect: ", err)
return
end
local position_key = ngx.var.position_key
local content = red:get(position_key)
ngx.print(content)
local ok, err = red:set_keepalive(10000, 100)
if not ok then
ngx.say("failed to set keepalive: ", err)
return
endgolang代码:
.. code:: go
代码语言：javascript复制package main
import (
"flag"
"fmt"
"github.com/garyburd/redigo/redis"
"log"
"net/http"
"runtime"
"time"
)
var (
pool *redis.Pool
redisServer = flag.String("redisServer", ":6379", "")
)
func indexHandler(w http.ResponseWriter, r *http.Request) {
t0 := time.Now()
conn := pool.Get()
t1 := time.Now()
fmt.Printf("The call took %v to run.n", t1.Sub(t0))
defer conn.Close()
result, err := conn.Do("get", "content_1")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
fmt.Fprintf(w, "Hello, %q", result)
}
func newPool(server string) *redis.Pool {
return &redis.Pool{
MaxIdle: 3,
IdleTimeout: 240 * time.Second,
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", server)
if err != nil {
return nil, err
}
return c, err
},
TestOnBorrow: func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
},
}
}
func main() {
runtime.GOMAXPROCS(runtime.NumCPU())
flag.Parse()
pool = newPool(*redisServer)
http.HandleFunc("/", indexHandler)
err := http.ListenAndServe(":8880", nil)
if err != nil {
log.Fatal("ListenAndServe: ", err.Error())
}
}golang中除了添加了线程池，还设置了cpu核数。
不过这个测试并不十分严谨，redis，nginx，golang http server，ab压测都在一台机器，相互之间会有影响。有兴趣的可以自己分开部署测试下。
