[PD] more about float limitation

[Alexandre Torres Porres]

>> sure, but it still runs faster if compiled to 64 bits in a 64 bit OS,
right?
>>

>why?

The only thing I have to back this assumption up is a recollection of a
message by miller to the list saying that tests with the 64 bit version
showed it was running faster, but I don't know anything about it, really.
Still trying to learn from you.

I'd also suspect that a double precision in Pd would make it much slower,
but the benchmarks from Katja didn;t point this out.

Seems like some future version of Pd running in full double precision is
not too crazy, huh?

cheers

2015-02-01 19:08 GMT-02:00 IOhannes m zmölnig <zmoelnig at iem.at>:

> On 02/01/2015 06:05 PM, Alexandre Torres Porres wrote:
> >>
> >> Seems Pd runs faster if compiled to 64 bits in a 64 bit OS than if it
> were
> >> compiled as 32, which does makes sense. That's all?
> >>
> >
> > "*no : pd compiled for 64 bit system will not run on 32 bit sytem, and it
> > will not load 32 bit externals.*"
> >
> > sure, but it still runs faster if compiled to 64 bits in a 64 bit OS,
> right?
> >
>
> why?
>
> if you run a 32bit binary on a 64bit OS, there might be some overhead
> involved (bit then i really don't know much about the performance of
> multi-arch systems)
>
> if you run a 32bit binary on a 32bit OS on a 64bit CPU (x86_64, which is
> compatible with 32bit CPUs), then it might be slightly slower than
> compared to a full 64bit system.
>
>
> the real advantages are:
> - memory access!
>  a 32bit application/OS uses 32bit pointers to access memory. this
> limits the accessible memory to 4GB (your OS might be able to manage
> more using PAE; but the application itself will have a maximum of 4GB.)
>  a 64bit application uses 64bit pointers to access memory. thats much
> more as you are likely to ever see in your lifetime (but then: 2640k are
> enough" anybody?)
>
> - modern OSs are 64bit (even the not-so-modern w32[sic!] has started to
> become a 64bit system).
> it seems silly to run 32bit applications on such systems (and a waste of
> ressources, as you need to install a 32bit version the entire
> runtime-environment)
>
>
> also check out: http://en.wikipedia.org/wiki/64-bit_computing
>
> fgrsam
> IOhannes
>
>
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