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From sebb <seb...@gmail.com>
Subject Re: OutOfMemoryErrors. Tips for performance improvement.
Date Wed, 13 Aug 2008 18:29:45 GMT
On 13/08/2008, Fitzpatrick, Adrian <adrianf@revenue.ie> wrote:
>
>  As Michael said , no errors! Where do you see the out of memory? In terms of
>  the JMX, the likely culprit is probably the HTTP cache manager. I see that it
>  clears after interation but I also see each iteration apppears to download a
>  hell of a lot! I haven't counted at all, but I imagine a worst case scenario
>  of 128 threads running simulateanously and downloading say 10mb per
>  iteration, theres up 1.2Gb memory gone before you even count jmeter's own
>  memory usage.... have u tried running without this element?
>

The Cache Manager should only save the Last-Modified and Etag values
for each URL, but maybe it has a fault.

>
>  -----Original Message-----
>  From: Eric Tchepannou [mailto:eric.tchepannou@gmail.com]
>
> Sent: 13 August 2008 18:55
>  To: JMeter Users List
>
> Subject: Re: OutOfMemoryErrors. Tips for performance improvement.
>
>
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>
>  see attached.
>
>  Thanks .
>
>  Eric.
>
>
>  On Wed, Aug 13, 2008 at 6:28 PM, Fitzpatrick, Adrian < adrianf@revenue.ie>
>  wrote:
>
>
>
>  Hi Eric,
>
>  We are running more threads with less memory than this, so it should be
>  possible. Are you doing anything odd in your thread groups that might consume
>  a lot of memory? If you want to share ur JMX file i can take a look and see
>  if I can spot anything....
>
>  Regards,
>
>  Adrian
>
>
>  -----Original Message-----
>  From: Eric Tchepannou [mailto: eric.tchepannou@gmail.com]
>  Sent: 13 August 2008 17:58
>  To: JMeter Users List
>  Subject: OutOfMemoryErrors. Tips for performance improvement.
>
>
>  Hi all,
>
>  I am looking for tips to improve performance with jmeter. I have recorded a
>  web test script containing two thread groups. Following the jmeter's best
>  practice guide, I have disabled all my listeners and I am running in nongui
>  mode and with "-Xms2048m -Xmx2048m". I am trying to simulate 128 (2 x 64)
>  users for one hour, but constantly get OutOfMemory errors after about 15
>  minutes. I would have hoped to be able to perform this test from a single
>  client, but it looks like this will only work with distributed testing or do
>  you know any other useful tip I could use to improve the performance?
>
>  Thanks,
>
>  Eric.
>
>
>
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