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I have a 64 bit Windows 7 machine with a 32 bit JVM. I have used the following commands to check whether my JVM is 32-bit or 64-bit

System.getProperty("sun.arch.data.model");
System.getProperty("os.arch");

The application I'm working on requires more heap space than the default 256 MB.So I have set the initialHeapSize=256 MB and maximumHeapSize=1490 MB in my Websphere Application Server 8.0.However after setting these properties in admin console,I'm not able to start the application server .It says "Error occured during start-up". If i set the maximumHeapSize=1230 MB, then the application server starts.But I have a requirement where i need the heap size to be increased upto 1900 MB. I'm completely out of options. Please help !!

Thanks

trincot
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gogo
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  • there is any option from `java -X` that helps ? type it in your console . – user2485710 Feb 14 '14 at 15:11
  • sorry .. I dint get wat you are trying to say – gogo Feb 14 '14 at 15:13
  • http://stackoverflow.com/a/20264362/2485710 – user2485710 Feb 14 '14 at 15:13
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    So u suggest that i run this command java -Xmx2048m -Xms256m and the JVM will be able to utilise upto 2048 MB?? Dont i need to set in the application server?? .But i got an error saying could not reserve enough space for the object heap – gogo Feb 14 '14 at 15:19
  • I you are dealing with a bottleneck that depends on the JVM settings usually those command line options are enough to fix the problem, just try it. – user2485710 Feb 14 '14 at 15:22
  • but it gave me an error saying 'could not reserve enough space for the object heap' – gogo Feb 14 '14 at 15:24
  • I noticed that your requirements are exceeding the limits of a 32 bit JVM http://stackoverflow.com/a/18040492/2485710 – user2485710 Feb 14 '14 at 15:26
  • We have an option to set the initial and maximum heap size in Websphere application server. How does this differ from the Xmx command?? – gogo Feb 14 '14 at 15:31
  • let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/47515/discussion-between-gogo-and-user2485710) – gogo Feb 14 '14 at 15:33
  • this options are provided by the "standard" jvm from Sun/Oracle and affects anything runs under the JVM itself, but this options and are not granted to be there because there are other vendors that are free to implement or not this command line options . I don't have time for chat right now, but in nutshell if this options are available to you I would prefer this over any software settings. – user2485710 Feb 14 '14 at 15:35
  • Ok.. I will give it a try and will see. Thanks. But have i used the right approach to find out if the JVM is 32-bit or 64-bit? – gogo Feb 14 '14 at 15:38

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Can you tell what error you are seeing in WAS logs probably in native_stderr.log or native_stdout.log file when the value set to "1490mb" ?

Are you specifying those values under "Application servers > server_name > Process definition > Java Virtual Machine" section ?

-vt Note: These opinions are my own

user3199937
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  • Yes. I am setting the values under Java Virtual Machine.But i need to set the Heap size to around 1900 MB. Is it possible? – gogo Mar 06 '14 at 08:44