Re: 32bit Vs 64bit OS

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  On 06/18/2010 04:05 PM, Chris Adams wrote:
> Once upon a time, Jerry Feldman<gaf@xxxxxxx>  said:
>> But, in my experience with 64-bit going back 16
>> years there are some applications that will run faster if built for
>> 32-bit and some will run faster if built for 64-bit.
> In the specific case of i386 to x86_64, you get better performance for
> 64 bit in many more cases because of the larger register set in x86_64.
> This isn't the case with some other architectures (e.g. SPARC or PPC),
> but is why 64 bit on Intel/AMD architectures is almost always a "win"
> compared to 32 bit on the same CPU.

While this is true. But, my benchmarks were actually done on both an 
IA64 box as well as x86_64 and x86 boxes.  I've also done some limited 
testing on HP-UX.  In general on x86_64 architectures you are almost 
always better off with a 64-bit OS, as you mentioned the additional 
registers and memory access is linear. In the cases of Sparc and 
PA-Risc, the chips were really 32-bit chips upgraded to 64-bit. The IA64 
and Digital Alpha chips were designed for 64-bits. I don't think the 
IA64 chip will ever be a desktop chip, but AMD and Intel still are 
figuring out how to breathe life into them.

However there are some applications that are so 32-bit dependent that 
they would require a full rewrite to go to 64-bit.

-- 
Jerry Feldman<gaf@xxxxxxx>
Boston Linux and Unix
PGP key id: 537C5846
PGP Key fingerprint: 3D1B 8377 A3C0 A5F2 ECBB  CA3B 4607 4319 537C 5846

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