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From: Sven Littkowski
Subject: Question: Aborting Pre-Trace: Possible to Continue?
Date: 11 Feb 2016 06:14:01
Message: <56bc6cf9$1@news.povray.org>
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Hi, just a general question:
I started to render a large, slow scene. Right now, it is pre-tracing
(radiosity). Since a day or so.
If I decide to abort and continue a next time, would I lose all
pre-traced squares and have to start all over (despite using "+c")? Or
would POV-Ray be able to keep these pre-traced areas? Thanks.
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From: Thomas de Groot
Subject: Re: Question: Aborting Pre-Trace: Possible to Continue?
Date: 11 Feb 2016 07:24:43
Message: <56bc7d8b$1@news.povray.org>
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On 11-2-2016 12:13, Sven Littkowski wrote:
> Hi, just a general question:
>
> I started to render a large, slow scene. Right now, it is pre-tracing
> (radiosity). Since a day or so.
>
> If I decide to abort and continue a next time, would I lose all
> pre-traced squares and have to start all over (despite using "+c")? Or
> would POV-Ray be able to keep these pre-traced areas? Thanks.
>
Unfortunately you loose all the pre-trace. +c only works when the render
proper has started. Pre-tracing then restarts after the last rendered point.
--
Thomas
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From: Sven Littkowski
Subject: Re: Question: Aborting Pre-Trace: Possible to Continue?
Date: 11 Feb 2016 07:36:34
Message: <56bc8052$1@news.povray.org>
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Hmmmm, this sounds to me that here is another good option for a useful
improve of POV-Ray's capabilities. I should go on the nerves of CLipka
with it (he'll love to hear from me again)...
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From: dick balaska
Subject: Re: Question: Aborting Pre-Trace: Possible to Continue?
Date: 11 Feb 2016 09:00:23
Message: <56bc93f7$1@news.povray.org>
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On 2/11/2016 7:36 AM, Sven Littkowski wrote:
> Hmmmm, this sounds to me that here is another good option for a useful
> improve of POV-Ray's capabilities. I should go on the nerves of CLipka
> with it (he'll love to hear from me again)...
>
Or you could get yourself a computer with a modern FPU. Celeron was
designed to be "cheap" and they did that by having a weak FPU and no
cache. (The theory was Word(tm) doesn't need an FPU).
You are trying to do the most complicated things with the least powerful
machine out there.
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From: Sven Littkowski
Subject: Re: Question: Aborting Pre-Trace: Possible to Continue?
Date: 11 Feb 2016 14:12:28
Message: <56bcdd1c@news.povray.org>
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Yes. All my powerful machines were stolen. And I have not yet recovered
enough, to get similar machines back...
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From: jr
Subject: which CPU, Re: Question: Aborting Pre-Trace: Possible to Continue?
Date: 12 Feb 2016 06:38:48
Message: <56bdc448$1@news.povray.org>
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hi,
On 11/02/2016 14:00, dick balaska wrote:
> Or you could get yourself a computer with a modern FPU. Celeron was
> designed to be "cheap" and they did that by having a weak FPU and no
> cache.
my elderly Celeron-based system needs replacing soon, which CPU would
you (and other readers) recommend?
--
regards, jr.
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From: dick balaska
Subject: Re: which CPU, Re: Question: Aborting Pre-Trace: Possible to Continue?
Date: 12 Feb 2016 10:46:44
Message: <56bdfe64$1@news.povray.org>
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On 2/12/2016 6:38 AM, jr wrote:
> hi,
>
> On 11/02/2016 14:00, dick balaska wrote:
>> Or you could get yourself a computer with a modern FPU. Celeron was
>> designed to be "cheap" and they did that by having a weak FPU and no
>> cache.
>
> my elderly Celeron-based system needs replacing soon, which CPU would
> you (and other readers) recommend?
>
i5's are "cheap". $500 for a decent system. That will give you 4 cores.
I just priced an i7 box for just under $1000. The i7's are all "double
threaded" which means 2 instructions at a time can be processed. So in
a 4 core CPU you get a virtual 8 cores.
My (4) core i7 box averages [1] twice as fast as my (4) core i5(s).
( http://www.buckosoft.com/bsac/ or
http://www.buckosoft.com/bsac/meta/ )
If you do a lot of POV-Ray and can afford it, get a 6 core i7 or even
the 8 core i7.
Intel's new number system sucks and you can't know your players without
a scorecard. I use this one.
https://en.wikipedia.org/wiki/Intel_Core
The only thing being an i7 means is it is double threaded. There is
still a *huge* variance between different models of i7. You could get
between 2 and 8 cores. So make sure you check the model number of the
chip! BestBuy advertises boxes with "latest generation Intel(R)(C) i7
technology!" This is not enough information to make an informed decision.
You can google "i7-4960x vs i7-4930k" and cpuboss.com will give you
graphs comparing the two chips.
If you can afford to be top dog, then you want the i7-5960X.
dik
[1] I have scenes where the i7 is only 20% faster than the i5. I have
other scenes where the i7 is 10x faster(!) than the i5. (I don't know if
that is a Windows (i7) vs. Linux (i5) issue.)
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From: Le Forgeron
Subject: Re: which CPU, Re: Question: Aborting Pre-Trace: Possible toContinue?
Date: 12 Feb 2016 11:44:26
Message: <56be0bea@news.povray.org>
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Le 12/02/2016 16:46, dick balaska a écrit :
>
> [1] I have scenes where the i7 is only 20% faster than the i5. I
> have other scenes where the i7 is 10x faster(!) than the i5. (I
> don't know if that is a Windows (i7) vs. Linux (i5) issue.)
My measures with i7 and povray (Linux): the HT-core is worth only 20
to 25% percent of a real core. At least for benchmark scene.
The compiler also play a significant role, and the intensive memory
access of a scene might too (if you are lucking enough for your parsed
scene to fit in the L3 cache of the CPU, big win): remember, despite
the number of cores, there is only one bus to reach the RAM.
http://wiki.povray.org/content/User:Le_Forgeron/vault/Compilation
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From: dick balaska
Subject: Re: which CPU, Re: Question: Aborting Pre-Trace: Possible toContinue?
Date: 12 Feb 2016 12:57:42
Message: <56be1d16@news.povray.org>
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On 2/12/2016 11:44 AM, Le_Forgeron wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Le 12/02/2016 16:46, dick balaska a écrit :
>>
>> [1] I have scenes where the i7 is only 20% faster than the i5. I
>> have other scenes where the i7 is 10x faster(!) than the i5. (I
>> don't know if that is a Windows (i7) vs. Linux (i5) issue.)
>
> My measures with i7 and povray (Linux): the HT-core is worth only 20
> to 25% percent of a real core. At least for benchmark scene.
>
> The compiler also play a significant role, and the intensive memory
> access of a scene might too (if you are lucking enough for your parsed
> scene to fit in the L3 cache of the CPU, big win): remember, despite
> the number of cores, there is only one bus to reach the RAM.
>
> http://wiki.povray.org/content/User:Le_Forgeron/vault/Compilation
Interesting. 20 years ago, the Intel compiler was the gold standard for
Pov-Ray compiles. I would have thought that gcc would have picked up
whatever they were doing by now.
dik
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Here is an actual CPU-Test ...
http://www.pcgameshardware.de/CPU-Hardware-154106/Tests/CPU-Test-Benchmark-AMD-Intel-675663/
You can also look into the Luxmark-Results to get a good candidate ...
http://www.luxmark.info/top_results/LuxBall%20HDR/OpenCL/CPU
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