[Building Sakai] JAVA_OPTS issue

[Shoaib Chaudhary]

Hello Steve,

Thanks for replying.

I just wanted to know for Sakai is it good to use this much memory -- 1175
MB -- that is allocated. Total number of users are 4000 in our case. If it
is not enough what is the solution. should I make more VMs or use 64 bit
JVM.

many thanks again.

Regards
*MUHAMMAD SHOAIB* | Software Engineer
National University of Computer and Emerging Sciences
A. K. Brohi Road (Near Police Line) H11/4 Islamabad
Tel +92-(51)-111-128-128 Ext 344  Cell +92-(334)-5577712
muhammad.shoaib at nu.edu.pk


On Mon, Jan 24, 2011 at 11:26, Steve Swinsburg <steve.swinsburg at gmail.com>wrote:

> Hi,
>
> This is most likely to do with a 32 bit JVM.
>
> *Why can't I get a larger heap with the 32-bit JVM?*
>
> The maximum theoretical heap limit for the 32-bit JVM is 4G. Due to various
> additional constraints such as available swap, kernel address space usage,
> memory fragmentation, and VM overhead, in practice the limit can be much
> lower. On most modern 32-bit Windows systems the maximum heap size will
> range from 1.4G to 1.6G. On 32-bit Solaris kernels the address space is
> limited to 2G. On 64-bit operating systems running the 32-bit VM, the max
> heap size can be higher, approaching 4G on many Solaris systems.
>
> As of Java SE 6, the Windows /3GB boot.ini feature is not supported.
>
> If your application requires a very large heap you should use a 64-bit VM
> on a version of the operating system that supports 64-bit applications. See Java
> SE Supported System Configurations<http://www.oracle.com/technetwork/java/javase/system-configurations-139801.html> for
> details.
>
> ref: http://www.oracle.com/technetwork/java/hotspotfaq-138619.html#gc_oom
>
> cheers,
> Steve
>
>
> On 24/01/2011, at 5:16 PM, Shoaib Chaudhary wrote:
>
> Dear All,
>
> I am using Tomcat 5.5.31 from JVM 6 on Windows server 2003 Enterprise
> Edition. I have made Virtual machine with 2.5 GB RAM. Original System RAM is
> 4 GB. but when I set JAVA_OPTS XMX value more then 1175 tomcat doesn't run.
> Can any one help me out in this regards. I want to utilize whole 4 GB memory
> of my machine for deploying Sakai 2.7.1. What are the maximum value for
> Java_opts parameters.
>
> Regards
> *MUHAMMAD SHOAIB* | Software Engineer
> National University of Computer and Emerging Sciences
> A. K. Brohi Road (Near Police Line) H11/4 Islamabad
> Tel +92-(51)-111-128-128 Ext 344  Cell +92-(334)-5577712
> muhammad.shoaib at nu.edu.pk
>
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