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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
Date Tue, 15 Mar 2011 14:50:38 GMT
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Chuck,

On 3/14/2011 11:20 PM, Caldarale, Charles R wrote:
>> From: Leon Rosenberg [mailto:rosenberg.leon@gmail.com] 
>> Subject: Re: [OT] Followup on 32-bit versus 64-bit performance discussion(s)
> 
>> I'm sorry, I probably missed something, but why should 64 bit app on
>> 64 bit os on 64 bit cpu be slower as 32 bit analog?
> 
> Because all the data items are bigger, or have unused slack space
> associated with them, in a 64-bit JVM. Consequently, the number of
> actually useful bits transferred between the CPU scheduler, the operand
> caches, and main memory is less per cycle.

So, back to the original question: will a 32-bit JVM on a 64-bit OS give
me a bigger heap potential than a 32-bit JVM on a 32-bit OS?

- -chris
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