Re: [Linuxsampler-devel] NI Kontakt vs Halion performance (voice count)

[Robert J. <rob...@da...>]

Hi,

>
> PS: technical question about Linux on amd 64:
> Are pointers 4bytes (32bit =3D 4GB address space) or can you
> use 64bit pointers too ?

It was a long time since I poked around in lowlevel stuff, and I've never h=
ad=20
much experience with x86... your comments below seem to suggest there can b=
e=20
constraints in the operating system, is that the issue you want to find out?

Anyway I took a peek at:=20
http://www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/245=
92.pdf
from
http://www.amd.com/us-en/Processors/DevelopWithAMD/0,,30_2252_739_7044,00.h=
tml

=46rom what is in there I can't find any such constraints unless running in=
=20
compatibility-mode.
There are a few new modes with different level of compatibility, they seem =
all=20
to support adressing in larger chunks though...

All registers are 64bit that should be enough, or?

amd64 has all x86 registers (8 of them) extended to 64bit. It also has 8 ne=
w=20
general purpose registers that are 64 bit. Ontop of that there are 8 64bit=
=20
MMX registers (though they seem to occupy the same space as the FPU=20
registers) and 16 128-bit XMM registers. (see page 4 in pdf)

This all suggests to me that compilers will be able to do much better=20
optimizations on a64...

Oh, the instruction pointer is also 64bit.

/Robert


> If the second case is not possible it would a bit sad because
> it would mean you can manage more than 4GB but you would still
> have the 4GB per process limit which would hurt LS.
> ok we could fire up multiple instances and load some sample libraries
> in each instance thus maxing out the RAM anyway but it would not
> be as cool as doing all within one instance plus it could lead to
> some performance problems.
>
> Can someone of you shed some light here (or look up the stuff on google
> and post links to the relevant stuff eg kernel ML etc) ?
>
>
> cheers,
> Benno
>
>
>
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