Benchmarking php with apc, memcached
As we are very extensively using techniques to speed up web applications we build or host, I’d like to share some benchmarks. One of our clients is running site on our machines which is using SOAP/WSDL to get data. The application is extremely slow, result are very poor.
Apache is able to server this webapp within cca 23 pages per second, which is bad. Here are the ab results:
[root@webmel4 ~]# ab -n 400 -c 5 http://beta.somedomain.cz/ This is ApacheBench, Version 2.0.41-dev <$Revision: 1.141 $> apache-2.0 Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/ Benchmarking beta.somedomain.cz (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Finished 400 requests Server Software: Apache Server Hostname: beta.somedomain.cz Server Port: 80 Document Path: / Document Length: 45829 bytes Concurrency Level: 5 Time taken for tests: 17.637183 seconds Complete requests: 400 Failed requests: 0 Write errors: 0 Total transferred: 18473376 bytes HTML transferred: 18348354 bytes Requests per second: 22.68 [#/sec] (mean) Time per request: 220.465 [ms] (mean) Time per request: 44.093 [ms] (mean, across all concurrent requests) Transfer rate: 1022.84 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 6 6 0.2 6 9 Processing: 176 212 26.1 207 380 Waiting: 142 172 21.4 169 277 Total: 182 218 26.1 213 386 Percentage of the requests served within a certain time (ms) 50% 213 66% 221 75% 225 80% 230 90% 252 95% 272 98% 290 99% 325 100% 386 (longest request)
We decided to implement memcached which means some small code rewrite, which is quite simple. After that apache serves the pages within the 47 pages per second. Nice but still poor.
[root@webmel4 ~]# ab -n 400 -c 5 http://beta.somedomain.cz/ This is ApacheBench, Version 2.0.41-dev <$Revision: 1.141 $> apache-2.0 Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/ Benchmarking beta.somedomain.cz (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Finished 400 requests Server Software: Apache Server Hostname: beta.somedomain.cz Server Port: 80 Document Path: / Document Length: 11128 bytes Concurrency Level: 5 Time taken for tests: 8.403883 seconds Complete requests: 400 Failed requests: 0 Write errors: 0 Total transferred: 4579944 bytes HTML transferred: 4455233 bytes Requests per second: 47.60 [#/sec] (mean) Time per request: 105.049 [ms] (mean) Time per request: 21.010 [ms] (mean, across all concurrent requests) Transfer rate: 532.13 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 4 5 1.2 6 16 Processing: 45 98 40.8 88 249 Waiting: 37 81 34.0 73 218 Total: 51 104 40.7 94 253 Percentage of the requests served within a certain time (ms) 50% 94 66% 113 75% 131 80% 139 90% 165 95% 177 98% 205 99% 231 100% 253 (longest request)
Finally we decided to add apc php cache. Speed up is quite better cca 130 pages per second.
[root@webmel4 ~]# ab -n 400 -c 5 http://beta.somedomain.cz/
This is ApacheBench, Version 2.0.41-dev <$Revision: 1.141 $> apache-2.0
Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/
Benchmarking beta.somedomain.cz (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Finished 400 requests
Server Software: Apache
Server Hostname: beta.somedomain.cz
Server Port: 80
Document Path: /
Document Length: 11128 bytes
Concurrency Level: 5
Time taken for tests: 3.70608 seconds
Complete requests: 400
Failed requests: 0
Write errors: 0
Total transferred: 4584288 bytes
HTML transferred: 4459266 bytes
Requests per second: 130.27 [#/sec] (mean)
Time per request: 38.383 [ms] (mean)
Time per request: 7.677 [ms] (mean, across all concurrent requests)
Transfer rate: 1457.69 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 6 6 0.2 6 9
Processing: 21 31 8.2 30 83
Waiting: 14 23 7.9 22 76
Total: 27 37 8.2 36 89
Percentage of the requests served within a certain time (ms)
50% 36
66% 39
75% 41
80% 43
90% 47
95% 51
98% 60
99% 78
100% 89 (longest request)So, as you can see, there are ways to speedup the web apps not mentioning that the app itself can be better. We have seen the code and it seems to me that the programmer did not optimize anything within the code.
| technology | requests per sec | speed |
|---|---|---|
| php | 22.68 | 100% |
| php+memcachedphp | 47.6 | 210% |
| +memcached+apc | 130.27 | 574% |
Benchmarks were run against CentOS 4.8 machine running:
httpd-2.0.52-41.ent.4.centos4 memcached-1.4.1-2.el4.hrb php-5.1.6-3.el4s1.10 php-pecl-apc-3.0.19-1.el4.hrb php-pecl-memcache-3.0.4-3.el4.hrb
You can find non distribution packages within my repos.