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From "Robin D. Wilson" <>
Subject RE: JMeter 2.5 performance
Date Wed, 31 Aug 2011 15:44:10 GMT
 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?

Hard to say, I wasn't recording them in the benchmark data I keep - but in
just looking at it, I would say yes.

>>>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 
>> 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.

If it were something in the HTTP Request HTTP Client sampler, it might make
a difference if I switched to a different sampler. If it is a problem that
is global to all JMeter samplers, then it won't help at all. Just trying to
isolate the problem area.

>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?

Not that I can see. Everything appears normal to me.

Robin D. Wilson
Sr. Director of Web Development
KingsIsle Entertainment, Inc.
VOICE: 512-777-1861

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