Increasing heap size of JVM

how to increasing Java virtual machine ? Heap size
can any one write me a program of tell me some idea.

Sun's API+documentation is also a good place to start:
http://java.sun.com/javase/6/docs/
From there you get to the manual page for java.exe:
http://java.sun.com/javase/6/docs/technotes/tools/windows/java.html
Read the entries of -Xms and -Xmx. For examble:
java -Xms256m -Xmx512m MyClassThis starts the memory allocation pool with 256 megabytes and gives it
a maximum of 512 megabytes. If the numbers are two big for the JVM to
handle, it will fail immediately with a message to that effect.

Similar Messages

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  • Increasing heap size

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  • How to increase Heap size at runtime

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    And unless there is no reason to be swapped out
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    out.I don't understand this. If there is no reason to
    swap a page back to the disk - e.g., there is plenty
    of available phyiscal memory for some other process -
    then why would the OS bother to swap that page back
    out to the disk?Ok I don't understand the statement either :)
    So obviously I need to rephrase it.
    Page swapping only occurs when needed. If there is plenty of physical memory to hold everything, then swapping does not occur.
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    >
    And application can also tell the OS that it nolonger
    wants to use some memory (pages.) But what doesthis
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    need for an application to return memory to the OS.But since virtual memory is finite and there is a
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    Virtual memory in of it self does not cause swapping. If I allocate 1 gig for my application, when my application runs it will not have 1 gig of physical space. Only the memory that is 'touched' is relevant to the OS. So during a time slice it might be the case that only 16k of actual physical memory is used - say 8k for the small piece of code running and 8k for data (an over simplification but appropriate for this discussion.)
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    the OS can alleviate the problem.There is a difference between requesting memory and using memory. Memory that is used ('touched') is the only thing that has to be in physical memory. If you do indeed use a lot of memory in your application then more physical memory will help. But simply requesting more memory doesn't impact physical memory.

  • JGrasp -- how to increase heap size?

    Hello, can anybody tell me how to increase the max heap size in jGrasp?
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    Thanks.. I tried that, but I'm not sure that it
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  • Increase heap size of ucm server

    Hi
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    Hi ,
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    Srinath
    Edited by: Srinath Menon on May 29, 2013 5:58 PM

  • Peformance Improvement by increasing heap size

    Hi
    Is there any performace benefit when I execute my Java application by increasing the default heap size using Java -ms200m -mx200m <appName>
    Please support with some performance figures
    Regards
    Vishal

    If you know the size of the heap gows to you can save some time on startup. i.e.
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    The only diference I have found is when using SoftReference caching. Having more heap size will allow such a cahce keep it data for longer.
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  • How to set the heap size of JVM

    please let me know that how to set the heap size of JVM

    C:\>java -X
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        -Xint             interpreted mode execution only
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        -Xbootclasspath/p:<directories and zip/jar files separated by ;>
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    - Marcus

  • Invalid initial heap size in JVM 1.4.2_04 on Solaris 9 machine

    Hi,
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    I tried with - server option also. But same error. Can any one tell me what is the limit of heap size allowed in Solaris 9? Plz tell me work around for this.
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    Vasanth.

    cvringer wrote:
    I really hate this responses. If you bother others with your problems, at least take the trouble of informing others about the solution. You made this whole post worthless.Reply #2 answers the question. You need a 64-bit VM.
    I'm locking this zombie thread.
    Kaj

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