我的ApacheBench负载测试结果中的长度请求失败

Question

我有一个PHP的网站,Lighttpd.它也在Centos 5上使用MySQL.我用Apache Bench(ab)测试了我的PHP代码.它导致一些错误(失败的请求)表明其他长度超过正常.我绝对相信我的PHP结果总是应该具有相同的确切长度.我已经查看了我的Lighttpd和MySQL日志和错误日志,并且没有任何错误.

有没有办法在结果有其他长度时确切地检查ab得到什么,或者是否有其他方法可以找出原因是什么或"坏"结果是什么？

我需要知道,因为我需要100%的好结果.

-bash-3.2# ab -n 500 -c 200 http://domain.com/test/index.php
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking domain.com (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Finished 500 requests


Server Software:        lighttpd/1.4.20
Server Hostname:        domain.com
Server Port:            80

Document Path:          /test/index.php
Document Length:        15673 bytes

Concurrency Level:      200
Time taken for tests:   0.375862 seconds
Complete requests:      500
Failed requests:        499
   (Connect: 0, Length: 499, Exceptions: 0)
Write errors:           0
Total transferred:      7920671 bytes
HTML transferred:       7837000 bytes
Requests per second:    1330.28 [#/sec] (mean)
Time per request:       150.345 [ms] (mean)
Time per request:       0.752 [ms] (mean, across all concurrent requests)
Transfer rate:          20579.36 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   10   9.4      6      30
Processing:     0  113 133.5     16     342
Waiting:        0  111 134.3     12     341
Total:          0  123 138.9     16     370

Percentage of the requests served within a certain time (ms)
  50%     16
  66%    235
  75%    289
  80%    298
  90%    331
  95%    345
  98%    365
  99%    368
 100%    370 (longest request)

Answer 1

ab使用-v 2参数运行,意味着详细级别为2.这将转储响应头.如果您的请求未使用分块编码,您将看到一个"Content-Length"标头,指示每个响应的大小.

gw:~$ ab -n 1 -v 2 "http://whatever.com/"

...

LOG: header received:
HTTP/1.0 200 OK
...
Content-Length: 1568399

如果您的响应使用分块编码,则在传输结束之前不知道长度.通常,chunked编码仅用于压缩响应,而ApacheBench默认不进行压缩.

如果被压缩的响应无论出于何种原因可以解释它; 压缩长度取决于内容.

您还可以使用curl -i和--compress选项查看具有和不具有压缩的单个请求的响应标头.