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From: Jim Henderson
Subject: Re: Photon Map: Created at Lower Res than Scene?
Date: 1 Feb 2008 12:19:51
Message: <47a354b7@news.povray.org>
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On Fri, 01 Feb 2008 00:55:51 -0500, Sven Littkowski wrote:
> Hmm, sounds like it is made for Linux only.
No, it's a hardware-level implementation used by more than just Linux. I
just happen to use Linux almost exclusively, so I haven't run into it
with other OSes. For example, NetWare 5.1 (or maybe 6) required machines
that had PAE functionality, even if the machine had no memory over 4 GB.
Which meant the minimum requirement was a Pentium Pro or P-II, the first
platform that introduced PAE. It's been around for a long time.
Jim
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From: Sven Littkowski
Subject: Re: Photon Map: Created at Lower Res than Scene?
Date: 1 Feb 2008 22:52:24
Message: <47a3e8f8$2@news.povray.org>
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Ah... Thanks, Jim. Good knowledge you got there.
But that means, ifit is not some software solution, I can't get it for my
current system. A pity.
Thanks a lot,
Sven
"Jim Henderson" <nos### [at] nospam com> schrieb im Newsbeitrag
news:47a354b7@news.povray.org...
> On Fri, 01 Feb 2008 00:55:51 -0500, Sven Littkowski wrote:
>
>> Hmm, sounds like it is made for Linux only.
>
> No, it's a hardware-level implementation used by more than just Linux. I
> just happen to use Linux almost exclusively, so I haven't run into it
> with other OSes. For example, NetWare 5.1 (or maybe 6) required machines
> that had PAE functionality, even if the machine had no memory over 4 GB.
>
> Which meant the minimum requirement was a Pentium Pro or P-II, the first
> platform that introduced PAE. It's been around for a long time.
>
> Jim
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From: Jim Henderson
Subject: Re: Photon Map: Created at Lower Res than Scene?
Date: 1 Feb 2008 23:28:04
Message: <47a3f154$1@news.povray.org>
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On Fri, 01 Feb 2008 22:31:24 -0500, Sven Littkowski wrote:
> But that means, ifit is not some software solution, I can't get it for
> my current system. A pity.
Only if your system is a 486 or earlier. As I said, it's in the
hardware, you just need the software to be written to leverage it.
My original comment was in rsponse to Nicolas' statement that you'd have
to have a 64-bit system in order to access memory over 4 GB; PAE lets you
do that on 32-bit systems, so as long as the software is compiled for
PAE, it can address memory > 4 GB.
Jim
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From: Chambers
Subject: Re: Photon Map: Created at Lower Res than Scene?
Date: 2 Feb 2008 13:16:43
Message: <47a4b38b@news.povray.org>
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Nicolas Alvarez wrote:
>> Note to self: 3Gb in your system doesn't get around the fact that most
>> XP programs are only able to address 2...
>>
>
> I think there is a way to make it address up to 3GB; but if you have
> 4GB, you can't use it all unless you have a 64-bit system.
There is a way, but it's not certain to be stable.
XP, being a 32bit OS, allows each program to address up to 4GB of
memory. However, this is partitioned into 2GB for the program and 2GB
for the system. How having more RAM (say, 3GB like in my system) helps,
is that each individual program is really addressing a *different* 2GB
of their own memory. So although each only uses up to 2Gb locally, the
total can be up to 4GB of RAM still.
The hack is to make programs think that they have 3GB, and the system
has 1GB - but this isn't always guaranteed to work, and a lot of
programs won't with it.
Programs that are compiled for 64bit, or are made aware of large
addressing systems (I don't remember the MS name for the flag in the
EXE), aren't limited like this, and will simply use whatever memory the
system gives them.
--
...Ben Chambers
www.pacificwebguy.com
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