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From Alan Chaney <a...@compulsivecreative.com>
Subject Re: what is the upper limit of maximum heap memory for Tomcat with 32-bit JVM running on Red Hat Linux 4 (32-bit)
Date Thu, 23 Jul 2009 23:40:30 GMT

> 2. Your other 'workaround' is to install a 64 bit OS and a 64 bit JVM. 
> Then you can have 7G+ for the JVM.

Actually, to be totally clear, you can have pretty much as much memory 
as you have physical ram in the machine. In your case that's 7G+

For more info on the 64bit JVM see 
http://java.sun.com/docs/hotspot/HotSpotFAQ.html#64bit_heap

Apparently RHEL 4 x64 supports up to 16GB and RHEL 5 claims 'unlimited'
but I'll bet no-one has actually tried it with 16 TB.




> 
> Regards
> 
> Alan Chaney
> 
> 
> 
> Li,Henry wrote:
>> My Tomcat is running on 32-bit Red Hat 4 (2.6.9-78.0.1.ELsmp), host 
>> server has 8G physical memory and 4 processors.
>>  java version "1.4.2"  gcj (GCC) 3.4.6 20060404 (Red Hat 3.4.6-10)
>> I got java.lang.OutOfMemoryError
>> Current configuration: -Xms1024M -Xmx2304M
>> The host server has about 4.5G free memory. When I tried to increase 
>> -Xmx2304M to -Xmx3000M, I got this error:
>> Error occurred during initialization of VM, Could not reserve enough 
>> space for object heap
>> The maximum # I can reach is -Xmx2680M.
>> QUESTION: Is there an upper limit for -Xmx? What is the work around? 
>> How can I use my free memory on the server to
>> get rid of the OutOfMemoryError?
>>
>> Thanks,
>> Henry
>>
>>
>>
>>
>>
>>
> 
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