GoLang 开发HTTP服务器及并发测试
Go语言主打高并发，这里就编写一个简单的HTTP服务器，然后用ab测试不加Nginx的Golang并发能力。
编译Linux固件：CGO_ENABLED=0；GOOS=linux；设置到GOENV中，set GOENV=C:\Users\gaochaowei\AppData\Roaming\go\env；
Aliyun服务器本地，ab -n 10000 -c 1000 http://localhost:6500/
15 Server Software: 16 Server Hostname: localhost 17 Server Port: 6500 18 19 Document Path: / 20 Document Length: 14 bytes 21 22 Concurrency Level: 1000 23 Time taken for tests: 0.416 seconds 24 Complete requests: 10000 25 Failed requests: 0 26 Total transferred: 1310000 bytes 27 HTML transferred: 140000 bytes 28 Requests per second: 24033.44 [#/sec] (mean) 29 Time per request: 41.609 [ms] (mean) 30 Time per request: 0.042 [ms] (mean, across all concurrent requests) 31 Transfer rate: 3074.59 [Kbytes/sec] received 32 33 Connection Times (ms) 34 min mean[+/-sd] median max 35 Connect: 0 2 2.5 1 15 36 Processing: 0 6 4.1 5 27 37 Waiting: 0 5 3.5 4 25 38 Total: 0 8 5.4 6 34 39 40 Percentage of the requests served within a certain time (ms) 41 50% 6 42 66% 8 43 75% 9 44 80% 10 45 90% 13 46 95% 19 47 98% 28 48 99% 29 49 100% 34 (longest request)
当设置并发5000时，出现问题：socket: Too many open files (24)
提示文件描述符打开过多。这样的话就搞他，用ulimit -a查看一下：
确实默认的最大文件打开数是1024，ulimit -n 102400可以修改一下，但是这个只能临时修改，具体永久修改方法不在这里说明，文件是/etc/security/limits.conf。
并发性能果然出色，有空具体分析吧。
