https://bz.apache.org/bugzilla/show_bug.cgi?id=62590
Bug ID: 62590
Summary: performance drop after moving from apache 2.2 to
apache 2.4
Product: Apache httpd-2
Version: 2.4.34
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Core
Assignee: bugs@httpd.apache.org
Reporter: pa...@adnovum.ch
Target Milestone: ---
Hi,
I have got an important performance drop after moving from apache httpd/2.2 to
apache httpd/2.4.
In order to tail down the problem, I did the following.
I downloaded, built and installed Apache/2.2.34. I did add ssl-support and the
following lines to httpd.conv:
StartServers 1
ServerLimit 1
ThreadLimit 2500
ThreadsPerChild 2500
ThreadStackSize 1048576
MinSpareThreads 1
MaxSpareThreads 500
MaxClients 2500
MaxRequestsPerChild 0
Here the output using ApacheBench:
Apache 2.2:
ab -k -n 2000000 -c 60 'https://adnvl005:44300/'
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking adnvl005 (be patient)
Completed 200000 requests
Completed 400000 requests
Completed 600000 requests
Completed 800000 requests
Completed 1000000 requests
Completed 1200000 requests
Completed 1400000 requests
Completed 1600000 requests
Completed 1800000 requests
Completed 2000000 requests
Finished 2000000 requests
Server Software: Apache/2.2.34
Server Hostname: adnvl005
Server Port: 44300
SSL/TLS Protocol: TLSv1/SSLv3,AES256-GCM-SHA384,1024,256
Document Path: /
Document Length: 44 bytes
Concurrency Level: 60
Time taken for tests: 192.131 seconds
Complete requests: 2000000
Failed requests: 0
Write errors: 0
Keep-Alive requests: 1980237
Total transferred: 731130414 bytes
HTML transferred: 88000000 bytes
Requests per second: 10409.59 [#/sec] (mean)
Time per request: 5.764 [ms] (mean)
Time per request: 0.096 [ms] (mean, across all concurrent requests)
Transfer rate: 3716.20 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.4 0 87
Processing: 0 6 1.2 6 71
Waiting: 0 6 1.2 5 70
Total: 0 6 1.3 6 98
Percentage of the requests served within a certain time (ms)
50% 6
66% 6
75% 6
80% 6
90% 7
95% 8
98% 9
99% 10
100% 98 (longest request)
----
I did then the same for Apache/2.4.34 (with apr-1.6.3 and apr-util-1.6.1), with
the following changes in the httpd.conf (including ssl-support):
StartServers 1
ServerLimit 1
ThreadLimit 2500
ThreadsPerChild 2500
ThreadStackSize 1048576
MinSpareThreads 1
MaxSpareThreads 500
MaxRequestWorkers 2500
MaxConnectionsPerChild 0
and here the output of ApacheBench:
ab -k -n 2000000 -c 60 'https://adnvl005:44300/'
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking adnvl005 (be patient)
Completed 200000 requests
Completed 400000 requests
Completed 600000 requests
Completed 800000 requests
Completed 1000000 requests
Completed 1200000 requests
Completed 1400000 requests
Completed 1600000 requests
Completed 1800000 requests
Completed 2000000 requests
Finished 2000000 requests
Apache 2.4:
Server Software: Apache/2.4.34
Server Hostname: adnvl005
Server Port: 44300
SSL/TLS Protocol: TLSv1/SSLv3,AES256-GCM-SHA384,1024,256
Document Path: /
Document Length: 45 bytes
Concurrency Level: 60
Time taken for tests: 571.058 seconds
Complete requests: 2000000
Failed requests: 0
Write errors: 0
Keep-Alive requests: 1980229
Total transferred: 689130083 bytes
HTML transferred: 90000000 bytes
Requests per second: 3502.27 [#/sec] (mean)
Time per request: 17.132 [ms] (mean)
Time per request: 0.286 [ms] (mean, across all concurrent requests)
Transfer rate: 1178.48 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 2.1 0 208
Processing: 0 17 20.3 10 285
Waiting: 0 17 20.3 10 285
Total: 0 17 20.4 10 285
Percentage of the requests served within a certain time (ms)
50% 10
66% 16
75% 23
80% 28
90% 44
95% 59
98% 79
99% 94
100% 285 (longest request)
----
As you can see, with apache2.4 it took more as twice as long. I think this is a
bug.
This performance drop occurs only if ssl is involved. For non-ssl request there
is no performance impact.
There are no error in neither logs.
For technical reasons I can't increase the ServerLimit.
Please let me know if you need any other information.
Many thanks for your help.
Regards
Paolo
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