[jboss-user] [Installation, Configuration & DEPLOYMENT] - Re: JBoss OutOfMemoryError - Help needed regarding Heap Size
The maximum heap you allocate depends on the operating system, even the patches to the operating system, the amount of RAM and swap space available, and the other DLLs that are loaded into the JVMs address space. For example, on a machine with 1GB RAM and 1GB swap space, you probably will not have enough free memory available to allocate 1.5GB. Another example: I recall that a certain software registered a lot of performance statistics, so when I ran the JVM I saw a lot of that software's DLLs in the JVM address space. One way you can check what DLLs are loaded with your JVM is with the listdlls or Process Explorer tools from SysInternals. Look at where the DLLs are loaded into memory - the JVM always allocates the heap in one contiguous block so you can only allocate as much heap as the largest free memory block. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166473#4166473 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4166473 ___ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
[jboss-user] [Installation, Configuration & DEPLOYMENT] - Re: JBoss OutOfMemoryError - Help needed regarding Heap Size
Thanks Peter. That was a great post! I am looking on to your presentation and checking to see if I can optimize my GC. BTW I am using Window XP as my platform, and is there a relation between the operating system word length and the maximum heap size that can be allocated?? Do we have any statistical relation for it? If I consider my OS to be 32 bit then I should be allowed to set a Maximum heap size 1.5GB which is 1536m (to be in multiples of 512m). If thats the case I am getting error for this statement Xms1536m -Xmx1536m. Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. Press any key to continue . . . View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166393#4166393 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4166393 ___ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
[jboss-user] [Installation, Configuration & DEPLOYMENT] - Re: JBoss OutOfMemoryError - Help needed regarding Heap Size
What operating system, are you using? I will assume Windows, and that it is 32-bit. In that case, you can only allocate around a 1.5GB heap. Also, what kind of OOME are you getting? See http://wiki.jboss.org/wiki/OutOfMemoryExceptions for suggested fixes. Based on your description, I am guessing that it is not a permgen space problem (those usually happen when you redeploy an app). In which case you probably have a memory leak somewhere in your application. You might want to monitor heap usage. See my presentation at http://www.cecmg.de/doc/tagung_2007/agenda07/24-mai/2b3-peter-johnson/index.html for some suggestions. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166207#4166207 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4166207 ___ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
