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32- and 64-bit performance
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Date: 2005-03-30 (09:43)
From: Alex Baretta <alex@b...>
Subject: Re: [Caml-list] 32- and 64-bit performance
Ville-Pertti Keinonen wrote:
> On Wed, 2005-03-30 at 09:46 +0200, Alex Baretta wrote:
> 64-bit data structures (due to bigger pointers, alignment, and in OCaml
> bigger default integers) are bigger, so things that are constrained by
> memory bandwidth are obviously going to be faster as 32-bit.
> On other architectures where you can use 32-bit or 64-bit that are
> otherwise identical, 32-bit is generally faster.

Ah, obviously! But this seems to imply that a 32-bit machine/compiler 
couple would be generally faster on symbolic processing algorithms, 
which generally require a good deal of memory allocations/deallocations. 
Since this is the kind of code which seems to be most idiomatic in 
Ocaml, I wonder how well or how badly 64 bits will actually impact all 
our software.


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