Out of memory

[David Wall <d....@computer.org>]

This is no doubt a java-related question, but it seems that with virtual 
memory, my JVM should never run out of memory (aside from a nasty bug 
and lack of swap disk space).  Is there a way to allow my web 
application to have as much memory as the OS will give it, yet not have 
the JVM attempt to consume all that space before the GC reclaims the 
space?  I'd like the JVM to start with 64M, max out around 1GB in terms 
of "holding the memory," yet allow it to use more memory when it needs 
it, and then have it attempt to release that memory so as not to cause 
swapping once the high memory need has disappeared.

Can this be done?

Thanks,
David

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Re: Out of memory

[Christoph Kutzinski <ku...@gmx.de>]

Hi,

first: You should start a new discussion thread, if you have a new 
question instead of answering to an existing one. Readers may not see 
your question if you don't.

-XX:+UseAdaptiveSizePolicy works good for me (with Java 5.0). Just give 
the VM a very big maximum heap size and the gc algorithm will determine 
for itself how much of the memory it needs.

Here is more info:
http://java.sun.com/developer/JDCTechTips/2005/tt0216.html#2


hth,
Christoph

David Wall wrote:
> This is no doubt a java-related question, but it seems that with virtual 
> memory, my JVM should never run out of memory (aside from a nasty bug 
> and lack of swap disk space).  Is there a way to allow my web 
> application to have as much memory as the OS will give it, yet not have 
> the JVM attempt to consume all that space before the GC reclaims the 
> space?  I'd like the JVM to start with 64M, max out around 1GB in terms 
> of "holding the memory," yet allow it to use more memory when it needs 
> it, and then have it attempt to release that memory so as not to cause 
> swapping once the high memory need has disappeared.
> 
> Can this be done?


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