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标题: http_load & ab 测试tomcat性能的疑问 [打印本页]

作者: 自由的风 时间: 2016-1-13 13:21
标题: http_load & ab 测试tomcat性能的疑问
关于性能测试，有2个疑问一直困惑了好久，哪位牛人给解释下啊

测试用tomcat安装后默认的主页面，

1. 用不同的工具，测试结果不一样，同一工具测试的结果有时也不一样
server 配置： 1核心 1G 内存， tomcat6
maxthreads,acceptCount 值为默认值，测试结果如下：
maxthreads+acceptCount  应该代表了能接受的最大并发访问量，默认为200+100 =300
按理，应该在300个并发访问的时候， http_load应该不会显示出错才对啊, 结果在180个并发时就出现了错（“bad byte counts”）

2.  在4核心， 4G内存的server上，测试到的性能（能接受的最大并发访问量），似乎与1核1G内存的server比，没有太大变化？

---------测试输出-----
[root@i-vyyaz6i1 ~]# http_load -p 180 -s 30 -v uri
http://121.201.63.133:8080/: byte count wrong
http://121.201.63.133:8080/: byte count wrong
1490 fetches, 180 max parallel, 1.1657e+07 bytes, in 30.0001 seconds
7823.48 mean bytes/connection
49.6665 fetches/sec, 388566 bytes/sec
msecs/connect: 197.334 mean, 2201.22 max, 0.42 min
msecs/first-response: 670.052 mean, 11131.6 max, 0.684 min
2 bad byte counts <----180个并发时， http_load显示有错
HTTP response codes:
  code 200 -- 1488
[root@i-vyyaz6i1 ~]# cat uri
http://121.201.63.133:8080/
[root@i-vyyaz6i1 ~]# ab -c 180 -t 30 http://121.201.63.133:8080/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 121.201.63.133 (be patient)
Finished 1488 requests

Server Software:       Apache-Coyote/1.1
Server Hostname:       121.201.63.133
Server Port:          8080

Document Path:       /
Document Length:       7834 bytes

Concurrency Level:    180
Time taken for tests: 30.041 seconds
Complete requests:    1488
Failed requests:       0                   <-----180个并发时， ab显示没有错
Write errors:          0
Total transferred:    12965925 bytes
HTML transferred:    12561092 bytes
Requests per second: 49.53 [#/sec] (mean)
Time per request:    3633.994 [ms] (mean)
Time per request:    20.189 [ms] (mean, across all concurrent requests)
Transfer rate:       421.49 [Kbytes/sec] received

Connection Times (ms)
            min  mean[+/-sd] median max
Connect:       3  164 219.1 118 1198
Processing: 70 2585 3988.6 580 26474
Waiting:       3  854 2488.6 132 15535
Total:       93 2750 3980.6 796 26515

Percentage of the requests served within a certain time (ms)
  50% 796
  66% 2789
  75% 3252
  80% 3632
  90% 5433
  95%  16231
  98%  16469
  99%  16523
100%  26515 (longest request)
[root@i-vyyaz6i1 ~]#

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