[idvusers] Maximum Heap Size

[Kevin Manross]

Since I had a moment, I wanted to pass along some results.

We upgraded our GeoWall display machine to WindozeXP-64 bit.  I then 
installed the 64-bit version of Java (and the only available Java 3D 
1.5.something).  If I run the IDV using the 'native' java jre for the 
machine (i.e., the 64-bit version I just installed) it allows me to 
increase the heap size beyond the ~1.5 Gb 'limit' that the 32-bit OS/jre 
allows me.  I believe I was able to increase it to around 3.5 Gb.

This allowed me to significantly increase the number of images/data 
points I could render.

I did *not* need to rebuild the IDV from source.

-kevin.
 


Kevin L. Manross wrote:
>
> Hi all,
>
> I am aware of how to increase the maximum heap space of the Java 
> Virtual Machine (JVM) via the command line.  What I'm unclear of is 
> the upper limit of the maximum heap space allowed.  I was hoping it 
> would be simply limited to the amount of physical memory.  
> Unfortunately this does not appear to be the case.  Can anyone on this 
> list conform this?
> From my experience, it appears that the application (IDV in this case) 
> won't start when specifying anything greater than -Xmx1536m .
>
> Is there a way around this?  (Caching?)
>
> Specifically, I'm wanting to display relatively long animations of 
> data displaying isosurfaces.
>
> I have a machine that has 4 Gb of physical RAM (actually 8 Gb, but my 
> OS only recognizes 4 Gb).
>
> Many thanks!!
>
> -kevin.
>

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