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 Topic: Apache performance tests with ab |
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Qmpeltaty
Joined: 06 Feb 2008
Posts: 182
Location: Poland
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 Posted: Fri 17 Jun '11 10:39 Post subject: Apache performance tests with ab |
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How to run more than 1000 concurrent request with -c option ? Ab hangs every time i want to test more than 1000 concurrent requests.
Any idea ? |
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James Blond
Moderator
Joined: 19 Jan 2006
Posts: 7371
Location: Germany, Next to Hamburg
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| Posted: Fri 17 Jun '11 10:50 Post subject: |
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I guess your OS and / or apache can't handle so many simultaneous requests. How did you configure your mpm? Which OS do you run?
Do you realy need that your server can handle that many requests at the same time? Even on very busy server I've seen not more than 300 at the same time. Notice simultaneous requests from a single client != reqests/second from apache. |
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Qmpeltaty
Joined: 06 Feb 2008
Posts: 182
Location: Poland
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| Posted: Sat 18 Jun '11 11:25 Post subject: |
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| James Blond wrote: | | I guess your OS and / or apache can't handle so many simultaneous requests. How did you configure your mpm? Which OS do you run? |
Win2k8 x64
ThreadLimit 5000
ThreadsPerChild 500
MaxRequestsPerChild 10000
| James Blond wrote: |
Do you realy need that your server can handle that many requests at the same time? |
Yes, and even more.
| James Blond wrote: |
Even on very busy server I've seen not more than 300 at the same time.
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Site served by apache i need to tune is very popular - even 1000-1200 request/s. Apache works as loadbalancer for JBoss application server which means that requests last longer (even 3-5s) than sites based on pure html or php.
| James Blond wrote: |
Notice simultaneous requests from a single client != reqests/second from apache. |
I'm aware of that. What is your experience with that ? Could you recommend any tools to measure it ? |
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tdonovan
Moderator
Joined: 17 Dec 2005
Posts: 611
Location: Milford, MA, USA
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| Posted: Sat 18 Jun '11 13:51 Post subject: |
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re: ThreadsPerChild 500
This limits Apache to processing 500 simultaneous requests because the Windows mpm always uses one child process. If you want to process 1000 simultaneous requests, you need to set ThreadsPerChild to a number greater than 1000.
re: MaxRequestsPerChild 10000
This causes the single Windows child process to restart itself after each 10000 requests. This may help if you have a module with a memory-leak error in it, but it is not otherwise helpful for a high-volume site. If you can set MaxRequestsPerChild to zero (the default for Windows), it will never restart itself - and that would be a better choice for your situation.
You will also want to ensure that whatever connector you use to connect Apache to JBoss is set up for more than 1000 simultaneous connections, else that could become the bottleneck.
Hope this helps,
-tom- |
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