JEP 141: Increase the Client VM's Default Heap Size

Sunny Chan openjdk at
Tue Feb 28 00:57:54 PST 2012

Michael Bien <mbien at ...> writes:

>   On 02/22/2012 12:48 AM, mark.reinhold at ... wrote:
> > Posted:
> >
> > - Mark
> >
> additional risks:
>   - JVM may not be able to start
>   - could contribute to the false impression that java requires a lot of 
> memory to run (JVMs usually don't like to give memory back to the OS 
> once its in use)
> best regards,
> michael

The "JVM may not be able to start" risk is particularly important to think 
At work we uses Citrix on Windows Servers and Citrix tends to fragment the 
address space by defining DLL's base address at location which breaks up the 
32bit address space - an example of the issue is specified here:

We probably want an algorithm to try a lower default -Xmx value if there isn't a 
large continuous block available for -Xmx1G.

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