Problem "could not reserve enough space for object heap"

[PeteG]

Hi,
I am trying to increase the memory allocated to my java app. VM parameter is currently -mx1536m and I want to increase it to -mx2048m (we utilise a lot of caching hence the largeish memory requirement) but I get the above error when I try to start my app. I have since read about limitations in memory that can be allocated to single processes on a Windows Advanced Server 2000 machine - the limit appears to be around 2Gb so fair enough :-(
However, there also appears to be a way to utilise more memory, at the expense of memory allocated to the operating system, by using Application Memory Tuning (4GT). Has anybody used this before? If so, what are your experiences in temrs of actually getting the thing to work and any ongoing memory usage issues? Thanks.

 

[DaWickedRebel]

You didn't say how much total memory your machine has, but remember you have to share the available memory with the OS, DLL's, etc. so you will not be able to allocate all the machines memory to the JVM.

This thread may be of help.

Rich

 

[sedj]

Nice link there DaWickedRebel (through that link, see

http://www.unixville.com/~moazam/).

Ahhh, contiguous heap memory ... mmmmmm ....

--------------------------------------------------
Free Java/J2EE Database Connection Pooling Software

http://www.primrose.org.uk

 

[PeteG]

Excellent links guys, thanks - though they confirm that I have a problem. Looks like I need to scale down the caching a tad... By the way, my machine has 4Gb RAM.