Performance 32 bit and 64 bit

Hi
On a 64 bit machine I can install 32 bit and 64 bit Oracle. Which solution gives better performance?

Hi,
Depending on windows or unix/linux i suppose the significance changes - i'm also assuming we are talking about Oracle Database performance here.
Given that the Oracle architecture on unix/linux is a process per user connection and on windows is a single process using a thread (or 2) per user connection the virtual address space available to an oracle instance is completely different. in a 32-bit the 2GB limit per process (or 3 with the /3GB switch, PAE/AWE) and single process architecture means that it doesn't scale very well in terms of concurrent connections (in the hundreds i think). Unix/linux in 32-bit does suffer from this so much as I understand because of the multi-process architecture.
However in 64-bit (EM64T/AMD64 or Itanium) this is not the case as virtual address space limits are much higher. Under windows 2003 x64 i think its something like 8TB per process. Now in theory windows is better at dealing with memory as a single oracle process has plenty of memory and all threads can share with minimal context switches.
The gap between EM64T and Itanium 2 is thought to be narrowing now. I was watching some video on [www.microsoft-oracle.com|www.microsoft-oracle.com] the other day and the guy was talking about some experiences where in lab environments they had discovered that the actual reason why an Itanium machine outperformed a EM64T was because of the L3 cache on the processor. video here
[Oracle Memory Configuration for Windows|http://download.microsoft.com/download/9/d/8/9d823991-afe9-47b5-8f71-3dd6237b28e6/0MM0memory.wmv]
apologies for being a little windows biased, it's only because I have relatively more experience there.
hope some of this helps :)

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