Worker vs prefork MPM

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Contents

Magneto Test

System Specs

CPU: Dual Quad Intel L5520 (16 total CPUs w/ hyperthreading)
OS: CentOS 5.5 64bit
RAM: 24G DDR3 1066
DISKS: Perc 6 Raid1 2x 146G 15K SAS
PHP
Version : 5.2.10
Cache : APC 3.0.19 + Magento Native
Apache
Server version: Apache/2.2.3
Server loaded: APR 1.2.7, APR-Util 1.2.7
Compiled using: APR 1.2.7, APR-Util 1.2.7
Architecture: 64-bit

Tests

  • All tests were done only after a `apachectl stop` then `apachectl start` to clear any cache. If you run the benchmarks with APC on repeatedly without doing the stop/start the numbers keep getting higher and less accurate.
  • Prefork
ab -c 1000 -n 10000 http://magento.*********.***/ 
# These are Magento recommended settings
<IfModule prefork.c>
StartServers 100
MinSpareServers 100
MaxSpareServers 150
ServerLimit 256
MaxClients 256
MaxRequestsPerChild 4000
</IfModule>
  • worker
ab -c 2000 -n 10000 http://magento.*********.***/
ab -c 2000 -n 10000 http://magento.*********.***/ (this also worked but was aborted to keep things fair on the tests between the two) 
<IfModule worker.c>
    ServerLimit         40
    StartServers        20
    MaxClients          2000
    MinSpareThreads     50
    MaxSpareThreads     2000
    ThreadsPerChild      50
    MaxRequestsPerChild  4000
</IfModule>

Results

Prefork

test1
ab -c 1000 -n 10000 http://magento.********.***/ 
Document Path:          /
Document Length:        17387 bytes
Concurrency Level:      1000
Time taken for tests:   14.43498 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      175950272 bytes
HTML transferred:       173889860 bytes
Requests per second:    712.07 [#/sec] (mean)
Time per request:       1404.350 [ms] (mean)
Time per request:       1.404 [ms] (mean, across all concurrent requests)
Transfer rate:          12235.27 [Kbytes/sec] received
 
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   86 538.0      0    9000
Processing:   115 1180 2391.0    713   14010
Waiting:      110 1178 2390.5    711   14008
Total:        115 1266 2438.6    714   14041
 
Percentage of the requests served within a certain time (ms)
  50%    714
  66%    720
  75%    724
  80%    728
  90%    778
  95%   3723
  98%  13760
  99%  13901
 100%  14041 (longest request)
Test 2
ab -c 50 -n 1000 http://magento.********.***/
Requests per second: 652.87
Test 3 APC Cache OFF
ab -c 50 -n 1000 http://magento.********.***/
Requests per second: 201.81

Worker

test1
ab -c 1000 -n 10000 http://magento.********.***/ 
Document Path:          /
Document Length:        17387 bytes
Concurrency Level:      1000
Time taken for tests:   12.488063 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      175961856 bytes
HTML transferred:       173901444 bytes
Requests per second:    800.76 [#/sec] (mean)
Time per request:       1248.806 [ms] (mean)
Time per request:       1.249 [ms] (mean, across all concurrent requests)
Transfer rate:          13760.10 [Kbytes/sec] received
 
Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0  259 1036.1      0    9000
Processing:   129  806 677.3    624    9287
Waiting:      116  798 668.8    618    9278
Total:        130 1066 1208.4    629   10243
 
Percentage of the requests served within a certain time (ms)
  50%    629
  66%    668
  75%    729
  80%    875
  90%   3524
  95%   3641
  98%   3954
  99%   5447
 100%  10243 (longest request)
Test 2
ab -c 50 -n 1000 http://magento.********.***/
Requests per second: 710.64
Test 3 APC Cache Off
ab -c 50 -n 1000 http://magento.********.***/
Requests per second: 238.01 [#/sec] (mean)
Retrieved from "http://www.misterx.org/wiki/index.php/Worker_vs_prefork_MPM"
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