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注：本文对于新版本的golang并不使用，go1以后go的性能已经有了比较好的提升，具体测试见： http://www.cnblogs.com/QLeelulu/archive/2012/08/12/2635261.html

听说Go是很不错的语言，了解了一下，一些特性确实很不错。

顺便测试了一下http与node.js的性能对比。

go的代码：

（注：是用8g, 8l编译的）

node.js的代码：

ab测试结果：

==** GO **==

$ ab -c 100 -n 1000 http://127.0.0.1:8080/
This is ApacheBench, Version 2.3<$Revision: 655654$>
Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8080
Document Path:          /
Document Length:        1 bytes
Concurrency Level:      100
Time taken for tests:   0.322 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      97000 bytes
HTML transferred:       1000 bytes
Requests per second:    3105.62 [#/sec] (mean)
Time per request:       32.200 [ms] (mean)
Time per request:       0.322 [ms] (mean, across all concurrent requests)
Transfer rate:          294.18 [Kbytes/sec] received
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        000.703
Processing:     13010.52955
Waiting:        13010.52955
Total:          43010.12955

==** Node.js **==

$ ab -c 100 -n 1000 http://127.0.0.1:8080/
This is ApacheBench, Version 2.3<$Revision: 655654$>
Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8080
Document Path:          /
Document Length:        12 bytes
Concurrency Level:      100
Time taken for tests:   0.143 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      50000 bytes
HTML transferred:       12000 bytes
Requests per second:    6993.50 [#/sec] (mean)
Time per request:       14.299 [ms] (mean)
Time per request:       0.143 [ms] (mean, across all concurrent requests)
Transfer rate:          341.48 [Kbytes/sec] received
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        001.104
Processing:     2136.61330
Waiting:        2136.61330
Total:          2146.41430

webbench测试结果

==** GO **==

$ webbench -t 30 -c 100 http://127.0.0.1:8080/
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1:8080/
100 clients, running 30 sec.
Speed=146934 pages/min, 262032 bytes/sec.
Requests: 73467 susceed,0 failed.

==** Node.js **==

$ webbench -t 30 -c 100 http://127.0.0.1:8080/
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1:8080/
100 clients, running 30 sec.
Speed=485128 pages/min, 404273 bytes/sec.
Requests: 242564 susceed,0 failed.

从测试结果来看，node.js的HTTP SERVER性能是Go的两倍还多，而且让我比较郁闷的是，在用webbench进行测试的时候，可以看到go是用了我的笔记本上的四个核的CPU的，而node.js当然是只跑在一个核上，而Go居然还比node.js慢这么多。

然后我google，就看到：golang helloworld 45% slower than node.js

求真相！