Re: [Caml-list] OCaml on ppc64 (Linux)?

[Christophe Raffalli <Christophe.Raffalli@univ-savoie.fr>]

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Gordon Henriksen a écrit :
> On Oct 24, 2007, at 15:29, Adrien wrote:
>
>> 2007/10/24, Xavier Leroy <Xavier.Leroy@inria.fr
>> <mailto:Xavier.Leroy@inria.fr>>:
>>
>>> Then someone told me that the Playstation 3 is a
>>> PPC64/Linux platform...  I'm still not quite sure whether having
>>> OCaml on PPC64/Linux is worth the effort, even if we had the
>>> corresponding hardware.
>>
>> PlayStation3's processor (the Cell) has some parenty with powerpc
>> but it mostly has differences (cell is a ppc6). It has many cores and
>> in fact a variable number of more-or-less specialized cores. It's a
>> sort of revolution because its SMP capabilities are really different
>> from thos of a Core2Duo or of an Athlon64X2. I think there is at
>> least a theorical interest as it seems to perfectly fit simultaneous
>> processing (but maybe not so close).
>
> The SPUs are quite unique, but the PPU (the likely target of an Ocaml
> implementation) is a fairly ordinary PowerPC.

not so fairly ordinary:

It has an in-order execution model (so it is very simple to free enough
room for the PPU), but it seems not to impact performance.
And it has a single precision floating point unit which is ultra fast
(15 times faster than the double precision unit of an intel chip).

For some specific numerical code, report achieve around 6 times the
speed of an intel chip by representing floats as a pair with a single
precision and a double precision approximation (doing the first
iteration using simple precision). ... Why did apple moved to intel ?

So guess what you would get using the SPUs ...

>
> — Gordon
>
> ------------------------------------------------------------------------
>
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-- 
Christophe Raffalli
Universite de Savoie
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tel: (33) 4 79 75 81 03
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mail: Christophe.Raffalli@univ-savoie.fr
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