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From Deepak Shetty <>
Subject Re: How to distinguish performance drawback source
Date Tue, 14 Jul 2009 17:31:32 GMT
possible problems that i can think of are
a. You have loaded the Jmeter client with more load than it can handle (as a
rule of thumb i wouldn't run more than 20-25 threads from a single client
jmeter).  You would need to distribute your test across multiple machines
(You can check whether your machine is overloaded by using your OS specific
perf monitoring tool - reliability and perf monitor on windows)
b. There is something that you need to tweak in your tests(e.g. if your
application uses caches , and the browser based tests are hitting the cache,
whereas the Jmeter tests are not)
c. You are downloading embedded resources (e.g. big flash/movie files or
something whereas the browser either has it cached or is streaming it).This
can easily be tested by checking your script and clearing your browser cache
before accessing the site while your load test is running.


On Tue, Jul 14, 2009 at 3:03 AM, ziohausam <> wrote:

> Hello All,
> I have a Question.
> I use Jmeter in my Performance test execution.
> Actually i always face drawback when number of users increases and of
> course
> this is normal.
> what is not normal is that while i check the performance live with the test
> execution running, i open a browser session for navigating the web
> application and i can't find any drawbacks. also i try this from different
> PCs, and no noticeable drawbacks.
> For example:
> in the testing tool, some request takes 2 seconds with 1 user. and 90
> seconds with 75 users running with ramp-up period 40 seconds. that's fine
> that's a noticeable drawback. but actually when i use the same PC or any
> different PC to call this request though the browser while it is processed
> by the test tool, i find no noticeable drawbacks.
> How can i explain this? how can i understand this, and also how can i
> distinguish performance drawback source (server, application, client
> machine
> hardware or bandwidth, etc)
> I had sent this post before in QA forums and had really helpful ideas to
> explain the reason, but they still do not represent the real cause as i
> have
> checked all suggestions and found every thing is ok. i hope i can find more
> ideas and explanations here too
> am
> Note: as i am only a beginner  using JMETER. most possibly is that i am
> missing something configuring my tool or test execution process.
> Regards,
> Hosam
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