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From "Domenico Marzilli" <domenico.marzi...@gatelab.com>
Subject Re: max heap size on Windows server 64 bit
Date Mon, 08 Feb 2010 16:31:59 GMT
Yes, Chris,
it depends on the type of data.
For example:
1) the elements of an array are addressed with 64 bit pointers;
2) on a x32 a long (32bit) is as large as a x64;
and so on....
By the way, what options for the JVM are you speaking about?
Domenico

----- Original Message ----- 
From: "Christopher Schultz" <chris@christopherschultz.net>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Monday, February 08, 2010 5:22 PM
Subject: Re: max heap size on Windows server 64 bit


> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Domenico,
> 
> On 2/4/2010 3:42 AM, Domenico Marzilli wrote:
>> It's normal to be forced to double the heap on migrating from x32 to x64
>> hw.
>> Just think to the pointer addressing , that is based on a 64bit
>> representation of the memory address, rather than a 32bit.
> 
> Er... maybe. Just because all pointers get twice as big doesn't mean all
> data gets twice as big. And, there are options for the JVM that allow
> the pointers to stay small, too :)
> 
> - -chris
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