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From sebb <seb...@gmail.com>
Subject Re: HTTP Sampler Memory Leak
Date Wed, 10 Oct 2012 19:35:53 GMT
On 10 October 2012 19:53, Deepak Shetty <shettyd@gmail.com> wrote:
> Hi
> its more likely that you have some listener turned on (like view results
> tree) - Even if a URL is 2000 characters you can calculate how many URLs
> before you use up say 100MB of memory. Do you really have that many URLs
> even if they are dynamic?
> http://jmeter.apache.org/usermanual/best-practices.html#lean_mean

Also, the cache key is

protocol://[user:pass@]host:[port]

plus proxy details (if used).

Unless you are targetting lots of different hosts, this is unlikely to
be the main problem.

> regards
> deepak
>
> On Wed, Oct 10, 2012 at 9:21 AM, unjc email <unjc.email@gmail.com> wrote:
>
>> Hi all,
>>
>> I have memory and cpu issues when running heavy load testing with
>> HTTP(S) sampler.  The purpose of my test is to hammer the server as
>> fast as Jmeter can, using a big list of hostnames and URIs, via a
>> proxy server.  The test plan I have setup is configured with
>> 100-thread thread group that contains a HTTPS Request sampler (using
>> HTTPClient4) and Summary Results generator.
>>
>> The machine I am using has 12GB memory and 16-core cpu.  I monitor the
>> top output throughout the test.  I notice the RES size of the jmeter
>> java process is growing really fast - it reaches 2GB heap size limit
>> in less 5 minutes.  The test could never go beyond 30-minute mark
>> without OutOfMemory exception.  I know there are plenty of free memory
>> for me to expand the heap size; but my concern is whether there is a
>> memory leak in the code.  I worry the process would suck up all
>> available memory anyway if I run a stress test for a day or longer.
>>
>> I have skimmed through the code of HTTPHC4Impl and found that there is
>> cache "map" for HttpClient with regard to URL.  I suspect this cache
>> map could go pretty crazy in tests that deal with large number of (or
>> dynamic) URLs.  Just curiosity, I tried running a test with using a
>> custom sampler as like HTTPHC4Impl but without the cache map; it seems
>> help slowing down the pace of the heap size.  However, the heap size
>> (RES size in top output) never seem settle at one level over time.
>>
>> Does anyone have any experience in running similar test as I do?  Does
>> it look like a potential "memory leak" to you?  Any comment or advice
>> will be appreciated.
>>
>>
>>
>>
>> Thanks,
>> Jacky
>>
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