Re: Moving from 32-bit to 64-bit Fedora

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On Tue, 2012-06-12 at 04:33 -0400, Andrew Haley wrote: 
> On 06/11/2012 11:27 PM, Alan Cox wrote:
> > Far from it. x32 is designed for performance. There are many applications
> > where the additional space occupied by 64bit pointers is a measurable
> > performance hit, but you still want to use the 64bit features of the CPU
> > in all other respects.
> It's pretty unusual.  Generally, the better ABI and supply of
> registers is a win for gcc-compiled code .  The pessimal case seems to
> be Python, which not only has 64-bit pointers but 64-bit ints on a
> 64-bit system.  I suspect that nine times out of ten 64-bit is a win.

Note that the extra registers are a feature specific to x86_64
architectures.  On PowerPC, for example, the memory hit is significant
enough that the standard configuration is 64-bit kernel and 32-bit
userspace, unless memory requirements dictate otherwise.

> Andrew.

Matthew Saltzman
Clemson University Math Sciences
mjs AT clemson DOT edu

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