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Posted to user@jmeter.apache.org by Blostin <ei...@gmail.com> on 2010/08/04 11:54:06 UTC
Out of memory message
Hi,
Can anyone help me with this problem? I've been running tests running a
small number of threads starting over a 1 minute period with no problem with
JMeter. I increased the size of the number of threads to 500 to start up
over an 8 hour period. JMeter threw an 'Out of Memory' error.
I had already increased available RAM to Jmeter and the only thing left to
me is to remove one of the two listeners from the script.
The available RAM was set at "set HEAP=-Xms1024m -Xmx1536m". Is this OK???
Should the Xms value be lower? My PC has 2Gb of RAM available.
Any help with this much appreciated...
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Re: Out of memory message
Posted by Sudip Kumar Bhattacharya <sk...@gmail.com>.
Try running your test in CUI mode instead of GUI mode.
If that does not work either, try to distribute it over 2-3 machines.
Sent on my BlackBerry® from Vodafone
-----Original Message-----
From: Felix Frank <ff...@mpexnet.de>
Date: Wed, 04 Aug 2010 12:15:47
To: JMeter Users List<jm...@jakarta.apache.org>
Reply-To: "JMeter Users List" <jm...@jakarta.apache.org>
Subject: Re: Out of memory message
Hi,
for large numbers of threads, be careful to keep the whole test as small
as possible. Each thread must maintain a dedicated copy, so memory
consumption rises with thread plan complexity. Refer to
http://jakarta.apache.org/jmeter/usermanual/best-practices.html#lean_mean
Of course, listeners like Aggregate Report consume memory over time,
that's true, refer to the Component Reference for alternatives that may
suit your needs better.
Your Java settings look fine to me.
HTH,
Felix
On 08/04/10 11:54, Blostin wrote:
>
> Hi,
>
> Can anyone help me with this problem? I've been running tests running a
> small number of threads starting over a 1 minute period with no problem with
> JMeter. I increased the size of the number of threads to 500 to start up
> over an 8 hour period. JMeter threw an 'Out of Memory' error.
> I had already increased available RAM to Jmeter and the only thing left to
> me is to remove one of the two listeners from the script.
> The available RAM was set at "set HEAP=-Xms1024m -Xmx1536m". Is this OK???
> Should the Xms value be lower? My PC has 2Gb of RAM available.
>
> Any help with this much appreciated...
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
Heartfelt apologies all round... I've had a rough day here. In fairness, my
question was 'How', not 'Can'.
I just find the Scheduler a tad confusing, believe me, I've read and re-read
the manual but it still makes no sense. I've previously tried to enter just
a start time but if I do that the End Time defaults to the current time.
I'll take another look and see if I can work it out...
And no, you're right Felix, I'm not a great dispenser of information because
I'm still learning myself. I don't know enough about the application to
confidently dispense any knowledge, however, I may just put something useful
up on youtube in the future to assist any JMeter novices like me!
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Re: Out of memory message
Posted by Felix Frank <ff...@mpexnet.de>.
Come now, Blostin, you're not exactly the great dispenser of information
yourself ;p
If you will so much as *look* at the Thread Group configuration, you
will find once you enable the Scheduler, that it has fields that
obviously do *exactly* what you've asked. I suggest Suresh tried not to
insult your intelligence by implying that you may not be using a version
that supports said feature. It would have been considerate not to insult
his indulgence in return.
Just my 2c...
On 08/04/10 17:41, Blostin wrote:
>
> That great, thanks Suresh R! As luck would have it I'm running JMeter 2.4 so
> an explanation is completely superfluous and in actual fact, would probably
> hinder me in my quest to 'tune' JMeter to a point where it actually does
> what I want.
>
> Thanks again Suresh, not know what I would've done without you...
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
That great, thanks Suresh R! As luck would have it I'm running JMeter 2.4 so
an explanation is completely superfluous and in actual fact, would probably
hinder me in my quest to 'tune' JMeter to a point where it actually does
what I want.
Thanks again Suresh, not know what I would've done without you...
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Re: Out of memory message
Posted by Suresh Rajachar <su...@yahoo.com>.
If you are using Jmeter 2.4 this feature is available.
Regards,
Suresh R
________________________________
From: Blostin <ei...@gmail.com>
To: jmeter-user@jakarta.apache.org
Sent: Wed, August 4, 2010 4:21:51 PM
Subject: Re: Out of memory message
And just one more thing...
The Scheduler...
How do I schedule a test to start at 22:00 and finish when the last thread
has completed?
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
And just one more thing...
The Scheduler...
How do I schedule a test to start at 22:00 and finish when the last thread
has completed?
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
What sort of Listener? Does removing it help? How fast does Jmeter go down?
Otherwise, go with an earlier suggestion and distribute your test across
as many Jmeter Servers as possible.
I've removed the Results Tree listener and I plan to run JMeter on a number
of PC's to simulate a larger load on the server.
It looks like everything will be alright now...
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Re: Out of memory message
Posted by Felix Frank <ff...@mpexnet.de>.
You're not answering the questions you're being asked.
On 08/04/10 16:26, Blostin wrote:
>
> If I employ distributed testing across different machines what is the
> accepted modus operandi here?
> Do I need to run the smaller user loads at different times, i.e. 100 users
> starting at 22:00 running over one hour, 100 users on another machine
> starting at 23:00 running over one hour, etc...?
> OR
> Can I kick off 5 tests on 5 machines all at the same time, each running 100
> users over a one hour period?
The latter is what is supposed to happen.
> Presumably I can use JMeter in GUI mode for the above. I've no idea how to
> use it running a dos interface.
You have been advised to try non-GUI to see if that helps your problem.
You've failed to do so. It's not that hard, and the documentation is
quite clear about it.
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
If I employ distributed testing across different machines what is the
accepted modus operandi here?
Do I need to run the smaller user loads at different times, i.e. 100 users
starting at 22:00 running over one hour, 100 users on another machine
starting at 23:00 running over one hour, etc...?
OR
Can I kick off 5 tests on 5 machines all at the same time, each running 100
users over a one hour period?
Presumably I can use JMeter in GUI mode for the above. I've no idea how to
use it running a dos interface.
Again, thanks for your input and any help much appreciated.
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Re: Out of memory message
Posted by Felix Frank <ff...@mpexnet.de>.
What sort of Listener? Does removing it help? How fast does Jmeter go down?
Otherwise, go with an earlier suggestion and distribute your test across
as many Jmeter Servers as possible.
HTH,
Felix
On 08/04/10 16:14, Blostin wrote:
>
> Thanks for the reply Felix.
>
> It seems with JMeter that every corner I turn I run in to a new problem. I
> admit I'm quite new to JMeter but I've followed all the guidelines to the
> letter of the law when it comes to creating and running a test.
> The test is basic but comprehensive. I only have one listener. I have
> checked "Retrieve All Embedded...", etc... I have accepted all the advise
> given but still I can't run a test of 500 simulated users logging on over an
> 8 hour period without JMeter crapping out on me.
> At this stage I'm totally frustrated with it. I need results to present to
> my boss and I need them fast. I need to be confident that JMeter will do
> what I want it to do, i.e. perform a load test but all I get is problems.
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
Thanks for the reply Felix.
It seems with JMeter that every corner I turn I run in to a new problem. I
admit I'm quite new to JMeter but I've followed all the guidelines to the
letter of the law when it comes to creating and running a test.
The test is basic but comprehensive. I only have one listener. I have
checked "Retrieve All Embedded...", etc... I have accepted all the advise
given but still I can't run a test of 500 simulated users logging on over an
8 hour period without JMeter crapping out on me.
At this stage I'm totally frustrated with it. I need results to present to
my boss and I need them fast. I need to be confident that JMeter will do
what I want it to do, i.e. perform a load test but all I get is problems.
I know I must be doing something wrong... but trying to find that 'something
wrong' is proving to be extremely frustrating!
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Re: Out of memory message
Posted by Felix Frank <ff...@mpexnet.de>.
Blostin,
it can be frustrating, I guess. From my experience, recorded plans don't
work well with large numbers of threads.
Have you made sure not to have unnecessary samplers?
Also, try removing all listeners and running in no-GUI mode with the -l
option to write performance data to a file. You may find that to be of
advantage.
HTH,
Felix
On 08/04/10 15:40, Blostin wrote:
>
> I'm not sure how I can 'generalise things' in my script. The test script is
> an accurate simulation of the user interaction with the web app. We
> estimated a user to take roughly 15 minutes to complete registration and
> that's what I have in my script.
>
> How do I use Loops and what purpose do they serve? As each user logs in they
> are required to change their password before completing registration, I'm
> unclear as to how Loops may help my test.
>
> I'm becoming pretty frustrated with JMeter but I suppose that's down to my
> own limitations in fully understanding what I'm trying to do. It just seems
> so difficult to simply record a test and run it to simulate a large load of
> users...
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
I'm not sure how I can 'generalise things' in my script. The test script is
an accurate simulation of the user interaction with the web app. We
estimated a user to take roughly 15 minutes to complete registration and
that's what I have in my script.
How do I use Loops and what purpose do they serve? As each user logs in they
are required to change their password before completing registration, I'm
unclear as to how Loops may help my test.
I'm becoming pretty frustrated with JMeter but I suppose that's down to my
own limitations in fully understanding what I'm trying to do. It just seems
so difficult to simply record a test and run it to simulate a large load of
users...
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Re: Out of memory message
Posted by Felix Frank <ff...@mpexnet.de>.
Does your recording include inline content such as images?
It shouldn't; if it does, remove the offending samplers and check the
"Retrieve embedded resources" box in the remaining HTTP samplers.
Other than that, try to generalize things and use loops if applicable,
as suggested by Best Practices.
HTH,
Felix
On 08/04/10 13:53, Blostin wrote:
>
> I recorded the test with one sample user where the user must login, change
> password, complete a number of forms, upload an image, etc. before they can
> complete registration. There's quite a number of steps and to simulate user
> interaction I used ${T} during the record. A single test will take roughly
> 15 minutes to complete so I understand that I can have a number of users at
> any given time going through the application. This scenario will be realised
> soon, it'll happen only once but I need to tell my boss how many users can
> be on the system over a fixed period of time, up to 12 hours...
>
> Thanks again!
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
I recorded the test with one sample user where the user must login, change
password, complete a number of forms, upload an image, etc. before they can
complete registration. There's quite a number of steps and to simulate user
interaction I used ${T} during the record. A single test will take roughly
15 minutes to complete so I understand that I can have a number of users at
any given time going through the application. This scenario will be realised
soon, it'll happen only once but I need to tell my boss how many users can
be on the system over a fixed period of time, up to 12 hours...
Thanks again!
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Re: Out of memory message
Posted by Felix Frank <ff...@mpexnet.de>.
Does your test plan understand your application logic, using e.g.
regular expression extraction?
Or have you recorded numerous paths that you have your threads walk
through linearly?
Try and follow the Best Practices. Otherwise, we will need some more
detials to answer that question.
Felix
> How do I keep my test as small as possible when I need to simulate a lot of
> users accessing the system through a web app and completing all the forms?
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Re: Out of memory message
Posted by Blostin <ei...@gmail.com>.
Thanks for the replies guys!
Felix Frank-2 wrote...
"for large numbers of threads, be careful to keep the whole test as small as
possible."
How do I keep my test as small as possible when I need to simulate a lot of
users accessing the system through a web app and completing all the forms?
I need to keep my test as realistic as possible but I also need to increase
my thread numbers from 50 threads all starting over a 10 minute period to a
more realistic scenario where 500 users log into the system over a 6 hour
period and complete registration.
I thought that 500 threads over 6 hours would be a much smaller load than 50
threads starting over a 10 minute period!! But it seems to play havoc with
JMeter!
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Re: Out of memory message
Posted by Felix Frank <ff...@mpexnet.de>.
Hi,
for large numbers of threads, be careful to keep the whole test as small
as possible. Each thread must maintain a dedicated copy, so memory
consumption rises with thread plan complexity. Refer to
http://jakarta.apache.org/jmeter/usermanual/best-practices.html#lean_mean
Of course, listeners like Aggregate Report consume memory over time,
that's true, refer to the Component Reference for alternatives that may
suit your needs better.
Your Java settings look fine to me.
HTH,
Felix
On 08/04/10 11:54, Blostin wrote:
>
> Hi,
>
> Can anyone help me with this problem? I've been running tests running a
> small number of threads starting over a 1 minute period with no problem with
> JMeter. I increased the size of the number of threads to 500 to start up
> over an 8 hour period. JMeter threw an 'Out of Memory' error.
> I had already increased available RAM to Jmeter and the only thing left to
> me is to remove one of the two listeners from the script.
> The available RAM was set at "set HEAP=-Xms1024m -Xmx1536m". Is this OK???
> Should the Xms value be lower? My PC has 2Gb of RAM available.
>
> Any help with this much appreciated...
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