Maximum Heap Size in Java 5

When migrating an application from JDK1.4.2_12 to JDK1.5.0_10,it was seen that the max. heap size that was set using -Xmx had to be reduced from 1.5 GB to 1.3 GB on a win32 machine inorder to create JVM successfully. Any pointers to what in Java 5.0 could have brought about this change is highly appreciated.
(Please note that I understand how heap size allocation works w.r.t virtual memory on win32.)

Because the VM foot print got bigger of course.
That has happened with every version of the Sun VM.

Similar Messages

  • The initial heap size must be less than or equal to the maximum heap size.

    All,
    Please help!!
    I have tested my Application Client Project in WSAD on my pc and it works fine.
    I have 1gb RAM on my pc. When I deploy the same app on another xp pc(same as mine but 512mb RAM) I get a heap size error. Here is the exact error:
    Incompatible initial and maximum heap sizes specified:
    initial size: 268435456 bytes, maximum heap size: 267380736 bytes
    The initial heap size must be less than or equal to the maximum heap size.
    The default initial and maximum heap sizes are 4194304 and 267380736 bytes.
    Usage: java [-options] class [args...]
    (to execute a class)
    or java -jar [-options] jarfile [args...]
    (to execute a jar file)
    where options include:
    -cp -classpath <directories and zip/jar files separated by ;>
    set search path for application classes and resources
    -D<name>=<value>
    set a system property
    -verbose[:class|gc|jni]
    enable verbose output
    -version print product version
    -showversion print product version and continue
    -? -help print this help message
    -X print help on non-standard options
    Could not create the Java virtual machine.
    Press any key to continue . . .
    Here is the batch file that runs my app:
    @echo off
    SET appClientEar=C:\corp\apps\mts\jars\MTSClientEAR.ear
    set JVM_ARGS=-Xms256M -Xmx256M
    set CLIENT_PROPS=C:\corp\apps\mts\jars\medicalclient.properties
    set APP_ARGS=
    call C:\bnsf\IBM\WebSphere\AppClient\bin\launchClientBNSF.bat "%JVM_ARGS%" %appClientEar% "-CCpropfile=%CLIENT_PROPS%" %APP_ARGS%
    @pause
    I have changed the value of Xms and Xmx of JVM_ARGS to different size but I sitll get error. Anyone knows what the problem is. Thanks..

    Don't know why, but the "maximum heap size: 267380736 bytes" value is just slightly less than 256*1024*1024, wheras the reported initial size is equal to that.
    Try setting the initial value to 255MB.

  • 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.

  • 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
    *$uname -a*
    SunOS labsbear 5.9 Generic_122300-19 sun4u sparc SUNW,Sun-Fire-V440
    *16GB total physical memory*
    *4 processor machine*
    *64 bit JVM*
    JDK1.6
    where is this limitation coming from. How to set the heap size to 6g.
    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!

  • Maximum heap size of JVM

    hi,
    I need to set the maximum heap size of the JVM. I know that I can do
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    I need this because I am using my system as a server for JSP web
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    hi,
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    I tried to set the maximum number of records that can be retrieved to 2000 so that the problem will be solved. But I am not able to set that as well. I did:
    Class.forName("com.fmi.jdbc.JdbcDriver").newInstance();
    Connection con = DriverManager.getConnection("standard statement");
    PreparedStatement pstmt = con.prepareStatement("select id, pubyear, Checkedoutby, >>callnumber from mprrc_materials");
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    ResultSet rs3 = pstmt.executeQuery();Its giving the error:
    java.lang.AbstractMethodError at that setFetchSize() statement.
    I guess the JDBC driver provided by Filemaker Pro does not support that. So what can be done to solve the problem.
    Thanks,
    Niranjan Maturi

  • "Incompatiable initial and maximum heap sizes specified" error

    Hi,
    Using the command below:
    java -jar -Xms128m myjar.jar
    I get the following errors:
    "Error occurred during initialization of VM"
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    it works fine apart from that the heap size is not desired.
    Can anyone please tell me what's the cause of the problem here? I'm suspecting the JVM has been configured to restrict manual adjustment of heap sizes...
    Many thanks.

    Hi,
    Using the command below:
    java -jar -Xms128m myjar.jar
    I get the following errors:
    "Error occurred during initialization of VM"
    "Incompatiable initial and maximum heap sizes
    specified"
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    java -jar myjar.jar
    it works fine apart from that the heap size is not
    desired.
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    problem here? I'm suspecting the JVM has been
    configured to restrict manual adjustment of heap
    sizes...
    Many thanks.It turns out that I need to also specify the maximum heap size as well. Thanks.

  • Incompatible initial and maximum heap sizes specified

    At first my program was crashing, saying;
    java.lang.OutOfMemoryError: Java heap space
    So I added this vm argument: -Xms128M
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    At first my program was crashing, saying;
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    So I added this vm argument: -Xms128M
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  • 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).
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    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 heap size in Java Studio Creator 2

    Hi,
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    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 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.

  • How to set the maximum heap size on a deployed application?

    I�m running a fairly large java application and am getting java.lang.OutOfMemoryError. I could increase the heap size in my development environment to eliminate this error. However, I don�t know how to set this in a deployed application. We are currently using ant to build our software.
    Another question, when I execute a statement such as java �Xmx512M �cp app.jar. Is it correct to say that the application in app.jar will use to a maximum of 512MB of memory when running?
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    But first, when you say "a deployed environment" do you mean an executable .jar file? This is what I'm using.The term "deploy" is commonly used to refer to deploying an ear file or a war file on an application server.
    I would assume that there is some entry you can include in the .jar's
    Manifest.mf file to specify the maximum memory, but I can't find an example of the entry. <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6197671"></a>

  • Problem increasing heap size using Java Control Panel

    I am running a web-based bioinformatics package which uses a Java applet as the client application. It mostly works fine, but some large clustering processes don't complete, they just cycle endlessly. The user manual advises increasing heap space "by entering the following command in the Java Control Panel or Java Plug-in dialog: -Xms128M -Xmx256M." I can open the Java Control Panel OK and enter the necessary command in the Java Runtime Parameters box, but after clicking OK then Apply, the Runtime Parameters box is empty again and there is no increase in the heap size allocation. In other words, the change doesn't take effect.
    I have already tried: adjusting one parameter at a time (max heap size first, then min); changing uppercase to lowercase M (-Xmx256m); restarting the browser after the change; rebooting my PC - none of these has helped.
    Technical details: it's Java 6 standard edition, build 1.6.0_10-rc-b28; browser is Internet Explorer 7; operating system is Vista (Service Pack 1); PC is a 2.4 GHz processor with 2 GB RAM (so I have plenty available to allocate to Java). I have local admin privilege on my PC.
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    The failure to retain the parameters is a bug, per hdong in this [Java,net thread|http://forums.java.net/jive/thread.jspa?threadID=44540&tstart=0] dated August 14
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    Yeah, it is a bug that will affect many manny developers. It will be fixed as soon as possible."

  • How to set the Heap size for JAVA

    I am facing the memory out of space problem:
    Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
    Could anyone suggest me a solution to solve the problem ?
    increase the heap size ?
    anyway to increase the heap size in the program by default without additional setup?
    Thank you.

    How to determine the program must handled with increase heap size ?
    could I know any method to know whether the program is memory leaking or need large memory heap size?

  • 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 in detail?

    I am writing an java app in eclipse that do need a lot of memory.
    The default
    java -Xms32m -Xmx128mis not enough.
    I want to change it to
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    But under either directory after I ran the above command, it returns help information like
    C:\Program Files\Java\jdk1.6.0_05\bin>java -Xms128m -Xmx512m
    Usage: java [-options] class [args...]
               (to execute a class)
       or  java [-options] -jar jarfile [args...]
               (to execute a jar file)
    where options include:
        -client       to select the "client" VM
        -server       to select the "server" VM
        .......Have I changed the heap size successfully?
    How can I verify it? I am using eclipse 3.2 running the application.
    Please offer me some help. Many thanks!
    Edited by: aaron9979215 on Jul 6, 2008 8:56 PM

    It is showing you the help message, because you forgot to specify a class. When you call the "java" command, you have to say a class name after the -Xms and -Xmx commands.
    So, do this:
    java -Xms128m -Xmx512m classNameWhere className is the main class of your app.
    Best of luck.
    -ottobonn-

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