Changing heap size for java

I type java -Xmx512m and it did not work. I gave me this
Usage: java [-options] class [args...]
What do I do?

Well I tried both methods you mentioned and it just gives me
Usage: JAVA.EXE [-options] class [args...]
etc, etc, etc.
I installed JRE 1.2.2 and remove JRE 1.4. I still get the same message when I type
Java -Xmxn
I installed JRE 1.2.2 on another machine and I still get the same results.
The operating system on the first machine is WinNT 4.0. The second machine is Win 2000.
How do I see what the min and max heap size are currently set at for JVM on these machines? I can't find that command either.
Help!

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Any way to increase the default Heap size for all Java VMs in Solaris 8

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I have a java product that deals with large databases under Solaris 8. It is a jar file, started by a cron job every night. Some nights it will fail because it runs out of Heap memory depending on the amount of records it has to deal with. I know that I could increase the java VM heap size with "java -jar -mx YY JARFILE" command but I have other java products that are showing the same behavior, and I would like to correct them all in one shot if possible.
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You could always download the source and modify it.

Recommended heap sizes for Dev/Live/Shared CF boxes

Hi all
I've searched through all the relevant past posts, but most of them were posted before CF8.0.1 going 64-bit, so the situation has changed slightly.
What are people's opinions on heap sizes for various server setups? I have my dev server - I leave this on 512MB and that's fine for most of the stuff I do. We generally up this to a gig on our live servers (which only run 3-4 small sites), and historically we've not gone above this on our Shared servers (which host anywhere up to 400 sites) because of the 32-bit limit.
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I have my dev server - I leave this on 512MB and that's fine for
most of the stuff I do. We generally up this to a gig on our live
servers (which only run 3-4 small sites), and historically we've not
gone above this on our Shared servers (which host anywhere up to 400
sites) because of the 32-bit limit.
However, now we're running CF9 on 64-bit Server 2008, we've obviously got a lot more RAM available. The obvious choice is to ramp it up high, but I've also been heard that causes issues of its own - the Java GC then has far more work to do when it's called and as the memory fills it's harder to get a contiguous block of RAM, so performance can suffer.
Leave the memory setting at the default value, until testing requires you to do otherwise, or your sites unravel some unforeseen memory demand. It's a risk our SysAdmin colleagues are prepared to take. With the coming of 64-bit, they've been on the alert, and have always cattle-prodded us whenever we've been tempted to push the button to go higher.
Our defaults almost coincide with yours: 512 MB for 32-bit and just over 1GB for 64-bit. So what you yourself have just said is my own basic wisdom on the subject, too: if it aint broke, don't try to fix it.
[postscript: I work full-time at one company, part-time at another. By pure coincidence, both use the same JVM memory settings.]

Maximum heap size for 64bit JVM

Hi,
I am trying to set the maximum heap size for a java process in a 64bit JVM . I am not able to set more then 3G
command line config:
java -Xms64m -Xmx3g -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.port=8000 com.superpages.puboptions.CampaignFeedStarter >> publisher.out 2>&1 &
Hardware / software configs
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SunOS labsbear 5.9 Generic_122300-19 sun4u sparc SUNW,Sun-Fire-V440
*16GB total physical memory*
*4 processor machine*
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JDK1.6
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Thanks for your time
Meena

You need to use the -d64 switch to request the 64-bit JVM. E.g.,$ java -showversion -Xmx6g HelloWorld
Invalid maximum heap size: -Xmx6g
The specified size exceeds the maximum representable size.
Could not create the Java virtual machine.
$ java -showversion -d64 -Xmx6g HelloWorld
java version "1.6.0_07"
Java(TM) SE Runtime Environment (build 1.6.0_07-b04)
Java HotSpot(TM) 64-Bit Server VM (build 10.0-b23, mixed mode)
Hello world!

How to increase heap size in java code, not using "java -Xms64m "

Im writing a java programme for loading the german dictionary. my dictionary is very huge(around 300000+ words).
while loading the dictioanry im getting error "OutOfMemoryError" .
I found one solution to increase the heap size, but i want to increase the heap size in java programmer itself, not outside jar file. so i could not use "-Xms64m" option of jvm.
Can anyone tell me how can i do this

sunlover1984 wrote:
Im writing a java programme for loading the german dictionary. my dictionary is very huge(around 300000+ words).
while loading the dictioanry im getting error "OutOfMemoryError" .
I found one solution to increase the heap size, but i want to increase the heap size in java programmer itself, not outside jar file. so i could not use "-Xms64m" option of jvm.
Can anyone tell me how can i do thisThat option is a startup option for the JVM. That means if your jar is already loaded then you are already too late to try and call it.

How to Increase Java Heap Size through Java Code. Increase inside Code?

Hi All,
I am using a third party tool. When i run a particular program it says OutOfMemory error. I like to increase heap size through Java Code before calling the particular Java application or Code..
Is there is any way to set the Heap Size through Java Code in run time ???
Pls Kindly help.
Thanks.

if you start the program with a -Xmx512m flag, the virtual machine gets half a gigabyte of memory to use (or that's the max it's allowed to use). All things run in the same virtual machine will have the same limit, third party tools run in the same virtual machine can't "not care about this" unless they're throwing OOMs themselves for some stupid reason.

What is the best way to verify default heap size in Java

Hi All,
What is the best way to verify default heap size in Java ? does it vary over JVM to JVM . I was reading this article http://javarevisited.blogspot.sg/2011/05/java-heap-space-memory-size-jvm.html , and it says default size is 128 MB but When I run following code :
public static void main(String args[]) {
int MB = 1024*1024;
System.out.println(Runtime.getRuntime().totalMemory()/MB);
It print "870" i.e. 870 MB.
I am bit confused, what is the best way to verify default heap size in any JVM ?
Edited by: 938864 on Jun 5, 2012 11:16 PM

938864 wrote:
Hi Kayaman,
Sorry but I don't agree with you on verification part, Why not I can verify it ? to me default means value when I don't specify -Xms and -Xmx and by the way I was testing that program on 32 bit JRE 1.6 on Windows. I am also curious significant difference between 128MB and 870MB I saw, do you see anything obviously wrong ?That spec is outdated. Since Java 6 update 18 (Sun/Oracle implementation) the default maximum heap space is calculated based on total memory availability, but never more than 1GB on 32 bits JVMs / client VMs. On a 64 bits server VM the default can go as high as 32gb.
The best way to verify ANYTHING is to address multiple sources of information and especially those produced by the source, not some page you find on the big bad internet. Even wikipedia is a whole lot better than any random internet site IMO. That's common sense, I can't believe you put much thought into it that you have to ask in a forum.

Upto how much I can set maximum Heap size for jvm?

I am running application on 8GB RAM Windows 64 bits machine.
I am running out of OutOfMemory (Heap Space). I want to increase the Heap Size for my jvm.
But can anybody please tell me what is the limit by which I can set the maximum size for heap?
Thanks in Advance,
Jenish

Max allowed memory per process is 2 raised to the 64th power. What maximum memory you can set depends on the memory available
for your application. You may be able to set more than 8GB ram then it will use the swap space and it will slow down your application
performance. So try different memory size and see which one works best for your application.

How To Increase heap size in Java Studio Creator 2

Hi,
I'd like to know how I can increase the heap size in Java Studio Creator 2.
I already tried editing creator.conf, but it doesn't seem to work...
Can anybody help me?
thanks.

In the servers window of creator, right-click 'Deployment Server' and choose 'View Admin Console'. A new web page comes up with the web interface to the Sun Application Server 8. Type your username and password that you configured during installation. I think default username is admin and default password either admin or adminadmin. After you're in, click 'Application Server' link in the left window, then click 'JVM Settings' tab, then click 'JVM Options' tab. Add new JVM option -Xms512m to start the server with 512MB. Find the -Xmx option and edit it to something larger, provided you have enough memory on your system.

How to set the default maximum size for java's heap?

Hi!
Im trying to set the default max size for the java heap - but not from the command line.
I would like to set it higher as default on my computer.. how can I do that?
thanks!

>
...You may increase the memory heap only when you're launching a new JVM.>Much like IWantToBeBig does.
OTOH, it this is an app. with a GUI, it is easier to launch it using webstart, and request extra memory in the JNLP descriptor (the webstart launch file).

How to change heap size in control panel

i've already searches previous post about this problem but still i couldnt get it to work or maybe i'm doing it wrong. i did it a lot of times but still i couldnt get it. can anybody show me how exactly to change the java heap sizes.
and is it possible to display the current java heap size of my jvm?
tnx in advance
nashstanley

You can change the heap by using an option to to the java command, when Java starts up. If you're starting an applet or a Web Start app(applies only to applets or Web Start) then use the Java Control Panel's Java tab to set a value.
The syntax (in all cases) is defined in the documetation for the java command.
There are a number of ways to see the heap size, none of which is "standard" Java, and they vary depending on the specifics of which Java you're running and what you're doing. See:
http://www.google.com/search?q=display+java+heap+size

Changing heap size for java

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