Solr Tomcat Maximum Heap Memory

["Husain, Yavar" <yh...@firstam.com>]

I know this is a Solr forum however my problem is related to Solr running on Tomcat running on Windows 64 bit OS.

I am running a 32 bit JVM on a 64 bit Windows 2008 Server. The max heap space I am able to allocate is around 1.5 GB though I have 10 GB of RAM on my system and there is no other process running.
I understand the limit of max 2GB of heap space that can be allocated on Windows for a process. However I have seen in the forums people state using Xmx upto 10G. How is this possible? If I move to Linux, can I get more heap space allocated to the process or is it related to JVM?

Simply put, how can I allocate atleast 8GB of RAM as Xmx to Tomcat on my 64 bit Windows. The tomcat crashes when I start. Please help.
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<PRE>

Re: Solr Tomcat Maximum Heap Memory

[Andre Bois-Crettez <an...@kelkoo.com>]

Try running a 64bit  JVM on your 64bits OS, it should work for much
larger heaps sizes, be it Linux or Windows.

Beware that the memory need is around 30% more important with a 64 bits
JVM (bigger object pointers) if you are not using Compressed Oops :
http://docs.oracle.com/javase/7/docs/technotes/guides/vm/performance-enhancements-7.html#compressedOop

André


Husain, Yavar wrote:
> I know this is a Solr forum however my problem is related to Solr running on Tomcat running on Windows 64 bit OS.
>
> I am running a 32 bit JVM on a 64 bit Windows 2008 Server. The max heap space I am able to allocate is around 1.5 GB though I have 10 GB of RAM on my system and there is no other process running.
> I understand the limit of max 2GB of heap space that can be allocated on Windows for a process. However I have seen in the forums people state using Xmx upto 10G. How is this possible? If I move to Linux, can I get more heap space allocated to the process or is it related to JVM?
>
> Simply put, how can I allocate atleast 8GB of RAM as Xmx to Tomcat on my 64 bit Windows. The tomcat crashes when I start. Please help.
>
--
André Bois-Crettez

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