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Posted to users@tomcat.apache.org by Rainer Jung <ra...@kippdata.de> on 2013/05/25 07:49:56 UTC
[OT] ab and load testing (was: Performance Issue while upgrading
from Embedded Tomcat 6 to Tomcat 7)
On 24.05.2013 17:54, Christopher Schultz wrote:
> Top reported that Tomcat was taking somewhere between 550-600% CPU.
> (This is a 4-core hyperthreaded CPU so I have 8 logical cores. 'ab'
> was taking about 100% CPU so I think 600% CPU means it was roughly
> pegging 6 of my logical cores. Roughly 30% system, 60% user CPU usage.).
The 100% CPU for "ab" indicates that "ab" was your bottleneck. AFAIK
"ab" is single threaded async, so it can handle multiple parallel
connections but will max out on one consumed CPU core. If you want to go
further, you would have to start multiple "ab" in parallel. Since you
are close to a CPU saturated system, in this specific case you might not
get much further, but 17454 requests/sec isn't that bad either :)
Regards,
Rainer
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Re: [OT] ab and load testing
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Rainer,
On 5/25/13 1:49 AM, Rainer Jung wrote:
> On 24.05.2013 17:54, Christopher Schultz wrote:
>
>> Top reported that Tomcat was taking somewhere between 550-600%
>> CPU. (This is a 4-core hyperthreaded CPU so I have 8 logical
>> cores. 'ab' was taking about 100% CPU so I think 600% CPU means
>> it was roughly pegging 6 of my logical cores. Roughly 30% system,
>> 60% user CPU usage.).
>
> The 100% CPU for "ab" indicates that "ab" was your bottleneck.
Interesting.
> AFAIK "ab" is single threaded async, so it can handle multiple
> parallel connections but will max out on one consumed CPU core. If
> you want to go further, you would have to start multiple "ab" in
> parallel.
Or just use JMeter, but at some point I will have client and server
fighting each other, as everything is on localhost.
> Since you are close to a CPU saturated system, in this specific
> case you might not get much further, but 17454 requests/sec isn't
> that bad either :)
Honestly, I was hoping for more, but I'm not really sure why... 1.4B
requests/day is pretty good for a laptop! Also note that these were
100% static content, so we're mostly talking about fopen and
read/write operations... nothing terribly exciting.
- -chris
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