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From Vance Zhao <vancez...@gmail.com>
Subject RE: JMeter 2.5 performance
Date Fri, 02 Sep 2011 15:44:14 GMT
i'm aslo hitting the slow result when using the http sampler with
httpclient4. i found it easily eat out all the resouce with httpclient4 and
actually i got OOM in the jmeter client side. Do we forget closing the
connction in jmeter?
On Aug 31, 2011 11:44 PM, "Robin D. Wilson" <rwilson2@gmail.com> 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?
>
> 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 std.dev?
>>>
>>> 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.
>
> 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
> www.KingsIsle.com
>
>
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