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From sebb <>
Subject Re: JMeter 2.5 performance
Date Tue, 30 Aug 2011 20:23:48 GMT
On 30 August 2011 21:03, Robin D. Wilson <> wrote:
> Sebb asked:
>>How do the average elapsed times compare?
> The average times are about 50% longer than with 2.4 - so where I was
> averaging ~1000ms for the 'submit' (POST) action, it is now showing about
> 1500 to 1750ms. (I am mostly concerned with the 'POST' because that's where
> all the real work occurs on our server side.)

Are all the methods equally affected?

>>Also what about min/max
> Those varied a lot from one run to the next anyway - just because I've
> always been dealing with very short durations - but I did notice that the
> 'max' seemed to consistently read higher than my prior benchmarks - but only
> by 1-2 seconds (1000-2000ms). Given the variables in the system - that
> doesn't seem too outrageous to me.
>>The http sampler code was re-organised for 2.5; additional classes were
> added and there is another code layer,
>>but I'd be surprised if that had a significant effect.
> I wonder if that mattered - it sure appears to be making a big difference. I
> think I could re-work the script to use AJP (we're hitting 'tomcat' through
> an apache front-end right now - and our apache uses AJP), but I have no
> prior benchmarks to compare AJP with...

Not sure how that would help.

I find it hard to believe that the additional code used by the
samplers - I think it's just one extra level of indirection - could
cause the significantly different results you are seeing.

Does the jmeter.log file show anything relevant?

> --
> Robin D. Wilson
> Sr. Director of Web Development
> KingsIsle Entertainment, Inc.
> On 30 August 2011 20:19, Robin D. Wilson <> wrote:
>> I have a JMeter script that performs registrations on our website. On
>> JMeter 2.4, I am able to run this script with a throughput of ~160
>> requests per second. With no other differences in the script, I run it
>> on JMeter 2.5 and only get about 78 requests per second (peak).
>> I checked and modified configs for all the new "HTTP/4" vs "HTTP/3.1"
>> vs "Java" for the HTTP Request HTTP Client sampler, none of that made
>> any difference.
>> Is JMeter 2.5 known for being slower? Or is there something I should
>> be examining in my configuration to get it to speed up?
>> The script consists of a 'master' script that includes a 'Registration'
>> sampler script. The 'master' script just allows me to setup the test
>> environment for my run, and having the 'registration' part included
>> lets me use that registration script in many different test plans.
>> The registration script performs the following actions:
>> HTTP Request HTTP Client  - GET the homepage HTTP Request HTTP Client
>> - GET the registration form page HTTP Request HTTP Client  - GET the
>> an AJAX request for our 'username suggestor'
>> HTTP Request HTTP Client  - POST registration form HTTP Request HTTP
>> Client
>> - GET the homepage (as logged in user - based on JSESSIONID cookie)
>> I generally run it with 100 threads, and have had very consistent
>> results when running it under JMeter 2.4. So this is really more of a
>> question about JMeter 2.5, and whether it added 50% more overhead to
>> the system somewhere, or if I am likely to have a configuration
>> problem that is throwing in extra delays.
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