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31 Oct 2024 19:26:49 EDT (-0400)
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From: Christoph Hormann
Subject: Re: Megapov 1.2.1 Linux - Followup
Date: 12 Sep 2005 18:00:02
Message: <dg4tma$nsm$1@chho.imagico.de>
Willem wrote:
> 
> Anyway, interesting to see that all no-one (!) accepts the possibility
> that the MegaPov distribution could contain a error. Although it most
> probably does not contain serious bugs,

This is completely wrong.  Everyone who has some basic knowledge about
programming knows that there are bugs in a program as large as MegaPOV
and esp. in new and partly experimental patches like in MegaPOV there
can be serious bugs.

Yet there has been absolutely no indication that any of the problems you
reported is caused by a fault in MegaPOV.

>  not too many people use it on a linux-box, so there could always be
> "something" if compiled on a different Unix-box.

That's wrong as well - why would you think that?

The fact that no one was able to reproduce any of the problems you
reported does not mean no one tried.

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/


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From: Willem
Subject: Re: Megapov 1.2.1 Linux - Followup
Date: 13 Sep 2005 02:31:02
Message: <43267226@news.povray.org>
Thorsten Froehlich wrote:
> Willem wrote:
>
> Hmm, five hours ago you said something different ;-)
Aargh,
You are right, sorry. I even mentioned kernel panic it in the original
post.

NO, just MegaPov crashing, kernel stay ok.

-----------------------------------
Lesson learned: ..Do not try to answer questions while having a
phone-conf at the same time...


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From: Willem
Subject: Re: Megapov 1.2.1 Linux - Followup
Date: 13 Sep 2005 02:43:37
Message: <43267519$1@news.povray.org>
Christoph Hormann wrote:
> Everyone who has some basic knowledge about
> programming knows that there are bugs in a program as large as MegaPOV
> and esp. in new and partly experimental patches like in MegaPOV there
> can be serious bugs.
Please don not mistake my kindness for dumbness. Of course it contains
bugs, but to bluntly state that, whilst you are spending serious time on
this program, is not going to help anyone is it ?


> The fact that no one was able to reproduce any of the problems you
> reported does not mean no one tried.
One has to live with the evidence presented. One cannot assume that
verything is allright, or totally wrong, just because you hear
nothing...that where these newsgroups come in: communication !!


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From: Nicolas Calimet
Subject: Re: Megapov 1.2.1 Linux - Followup
Date: 22 Sep 2005 04:43:16
Message: <43326ea4@news.povray.org>
> If I run ./configure without options the following flags are produced in
> the Makefile:
> CXXFLAGS =  -pipe -Wno-multichar -s -O3 -ffast-math -malign-double
> -minline-all-stringops -m3dnow -march=athlon-xp -mtune=athlon-xp

	Note that the -ffast-math and -m3dnow options are not part of
the official povray-3.6.1 configure script, but were most likely added
by the gentoo folks.  The former will be in official 3.6.2 - it was not
included so far, but indeed works without problem.  The latter has no
effect at all (identical binaries with and without the option on AMD
K7/K8 platforms) and is therefore useless; same for -mmmx.

	- NC


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From: Warp
Subject: Re: Megapov 1.2.1 Linux - Followup
Date: 22 Sep 2005 07:23:56
Message: <4332944c@news.povray.org>
Willem <Willem> wrote:
> -march=athlon-xp -mtune=athlon-xp

  AFAIK the -march option automatically turns the equivalent -mtune (and also
the equivalent -mcpu) on, so there's no need to specify it explicitly.

-- 
                                                          - Warp


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From: Nicolas Calimet
Subject: Re: Megapov 1.2.1 Linux - Followup
Date: 22 Sep 2005 09:16:07
Message: <4332ae97@news.povray.org>
>   AFAIK the -march option automatically turns the equivalent -mtune (and also
> the equivalent -mcpu) on, so there's no need to specify it explicitly.

	Yes, this is known and the change was done already for the next release.

	- NC


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From: Willem
Subject: Re: Megapov 1.2.1 Linux - Followup
Date: 28 Sep 2005 11:29:21
Message: <433ab6d1$1@news.povray.org>
Nicolas Calimet wrote:

>     Note that the -ffast-math and -m3dnow options are not part of
> the official povray-3.6.1 configure script, but were most likely added
> by the gentoo folks.  The former will be in official 3.6.2 - it was not
> included so far, but indeed works without problem.  The latter has no
> effect at all (identical binaries with and without the option on AMD
> K7/K8 platforms) and is therefore useless; same for -mmmx.
> 
>     - NC

No. --fast-math was not added by Gentoo package maintainer.
Using the Gentoo version got me in trouble with
Christoph....so I downloaded & used the default tarball.

It was the Megapov script from Christoph which supplied
the --fast-math.

WdW


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