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From Deepak Shetty <>
Subject Re: configuring JVM_ARGS on linux
Date Fri, 26 Nov 2010 13:52:21 GMT
Thats funny - the parameters you see should impact garbage collection (on
Sun JVM) .
What JVM are you running (inclusive of version) - XX parameters may not be
supported on all versions / OS/ and are subject to change (and valid only
for SUN) - check the documents

However they should have no impact on the number of threads you can spawn
(unless you are getting an Out of memory) - though yes they can have an
impact on performance.

When you say cant start what errors do you get? Its possible you are seeing
some other issue on Linux


On Fri, Nov 26, 2010 at 5:40 AM, Adrian Speteanu <>wrote:

> Hello,
> Need some advice on configuring jmeter shell script to run better on linux
> (debian/ubuntu in my case).
> Uncommenting these parameters in jmeter script has adverse affects:
>  # SURVIVOR="-XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=20%"
>  # EVACUATION="-XX:MaxLiveObjectEvacuationRatio=20%"
> The JVM doesn't want to start with them on debian, although I ran
> jmeter.bat
> with them on default values or improved targets, on Windows XP, Vista, 7
> stations:
> I didn't find an answer in previous threads, though this was discussed some
> time / some years ago.
> Still jmeter works without, BUT there is a noticeable performance penalty
> without them: with the changes I make in jmeter.bat, I can start more then
> 4000 threads on a Win XP desktop system, with a simple script; on the same
> hardware with ubuntu installed or on other more powerful machines with
> debian I can't start more then 2000 threads, same script of course (using
> GUI or not). Considering that XP has a max threads limit of 10.000 and that
> the server had 16g of ram, this upsets me, it should work better on linux.
> The script doesn't depend on an external application, just uses a lot of
> and memory and I used to tune how jmeter runs, however I have encountered
> some problems with JVM in tests that ran for longer periods of time.
> Any suggestions?
> ----
> just in case, here is what is in jmeter shell script:
> HEAP="-Xms512m -Xmx1512m"
> NEW="-XX:NewSize=64m -XX:MaxNewSize=128m"
> #SURVIVOR="-XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=20%"
> TENURING="-XX:MaxTenuringThreshold=2"
> #EVACUATION="-XX:MaxLiveObjectEvacuationRatio=20%"
> RMIGC="-Dsun.rmi.dgc.client.gcInterval=600000
> -Dsun.rmi.dgc.server.gcInterval=600000"
> PERM="-XX:PermSize=64m -XX:MaxPermSize=64m"
> DEBUG="-verbose:gc -XX:+PrintTenuringDistribution"
> DUMP="-XX:+HeapDumpOnOutOfMemoryError"
> (the rest is unchanged).
> Thanks & regards,
> Adrian S

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