The heap tuning only provides unmeasurable gains at relatively low loads (i.e. when the CPU of the machine where JMeter runs is below 50%). Even the gains at high loads are small (run with "-verbose:gc" to get a log of times devoted to GC), although it becomes more important with complex long-running tests that have higher memory needs. But yhe most important effect is still that Full GC pauses are almost completely elliminated, which is good because they sometimes caused significant disturbance in the measurements in short-running tests.
-- Salut,
Jordi.
En/na Peter Lin ha escrit:
that's strange. when I run it with and without the extra options on my gateway laptop running XP and my old P3 450 it is faster if I just have "-server" without all the extra options.
maybe it's just my system or configuration.
peter
On Tue, 24 Aug 2004 13:13:29 +0200, Jordi Salvat i Alabart <[EMAIL PROTECTED]> wrote:
It's exactly the opposite: you'll want those parameters (tuned as suggested in the script's comments) when you need to generate high loads -- that is: in actual use, not during development.
These settings minimise (or almost) the amount of time spent in garbage collection. This increases maximum throughput (i.e. the amount of traffic you can generate with a given machine and a given script). They also reduce the frequency of full GCs to a minimum (most tests running for only a few hours will never need a full GC) thus reducing measurement error.
I can't tell why Michael is getting that error with the HEAP options in place -- those default parameters work well for me with JDK 1.4.2_03 (I don't have _04 at hand).
But removing the -Xms/-Xmx without removing the -XX:NewSize/-XX:MaxNewSize as he did in his last message causes exactly that (as I would expect: the default heap is far too small to accomodate a 128m new space). So leave all those parameters in place or remove them all.
-- Salut,
Jordi.
En/na Peter Lin ha escrit:
can you try commenting out all the extra VM parameters?
usually I do that, since many of the settings really shouldn't be used for regular use. It's good for developers writing samplers and plugins, but not necessarily great for just running tests.
peter
On Mon, 23 Aug 2004 13:16:16 -0600, Michael Chandler <[EMAIL PROTECTED]> wrote:
I installed j2sdk1.4.2_04. The same on both XP and win2k. I also have j2sdk1.4.0-rc and j2sdk1.4.0_01. The newer one is first in my path and classpath.
Here is the echo (without [HEAP=-Xms256m -Xmx256m]): echo %JAVA_HOME%\bin\java %JVM_ARGS% %ARGS% -jar ApacheJMeter.jar %JMETER_CMD_LINE_ARGS%
c:\j2sdk1.4.2_04\bin\java -XX:NewSize=128m -XX:MaxNewSize=128m -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=50 -XX:MaxTenuringThreshold=2 -XX:MaxLiveObjectEvacuationRatio=20 -Dsun.rmi.dgc.client.gcInterval=600000 -Dsun.rmi.dgc.server.gcInterval=600000 -XX:PermSize=64m -XX:MaxPermSize=64m -verbose:gc -XX:+PrintTenuringDistribution -jar ApacheJMeter.jar Error occurred during initialization of VM Incompatible initial and maximum heap sizes specified
-----Original Message----- From: BAZLEY, Sebastian [mailto:[EMAIL PROTECTED] Sent: Monday, August 23, 2004 12:16 PM To: 'JMeter Users List' Subject: RE: win 2000
Did you install the full JDK, or just the JRE?
Some of the options may only make sense if the "server" flavour of the JVM is installed.
Certainly java -server only works if the full JDK is installed ...
S. -----Original Message----- From: Michael Chandler [mailto:[EMAIL PROTECTED] Sent: 23 August 2004 19:07 To: JMeter Users List Subject: RE: win 2000
If I take it out, it still gives me the error. I'll try rebooting here in a minute and do it again. I've tried several combos. I'll look at java - X, also.
-----Original Message----- From: Peter Lin [mailto:[EMAIL PROTECTED] Sent: Monday, August 23, 2004 11:55 AM To: JMeter Users List Subject: Re: win 2000
it should work if you remove it. I have JMeter 2 and 1.9 running on my workstation at home, which is running win2K. it works with Sun jdk1.4.2_03 and jdk5
peter
On Mon, 23 Aug 2004 11:44:58 -0600, Michael Chandler <[EMAIL PROTECTED]> wrote:
I've been running Jmeter successfully on my XP box. When I try to run
it
on a Win 2000 box, I get the error:
Error occurred during initialization of VM Incompatible initial and maximum heap sizes specified.
The jmeter.bat file has the entry: set HEAP=-Xms256m -Xmx256m
I tried resetting it but haven't found the correct combination.
Any ideas?
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