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From Andre Bois-Crettez <>
Subject Re: Solr Tomcat Maximum Heap Memory
Date Wed, 21 Dec 2011 16:04:38 GMT
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 :


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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