[Radiance-general] Error: rtcontrib: fatal - incomplete ray value from rtrace

[David Appelfeld]

Hi Greg again,

I have just reinstalled Radiance completely last week, because when I
generated rendering with three-phase method I have got light coming somehow
from wrong side and Andy suggested to reinstalled it.

I guess you may be right with the system limits. Because I have exceeded
number of opened files before and there could be maybe some other limit
which I am exceeding. Unfortunately I can not change the limits, I have
contacted the servers support but they cannot change it.

The parameters are quite high. I may reduce some but then I have to run
whole simulation again, also for the sensors which I have got results for.


-ab 5
-ad 2048
-as 0
-aa 0
-lw 1.00E-12
-ds 0.1
-dj 0.9
-dt 0
-dc 0.75
-n 4

I have started to run the simulation again and I will see how it goes. My
further step will be probably reduce the parameters.

Thank you for your advices.
David

On 19 May 2011 17:15, Greg Ward <gregoryjward at gmail.com> wrote:

> Hi David,
>
> Andrew McNeil recently found a problem with rtcontrib running in 64-bit
> mode on a 32-bit operating system, where very complex ray trees would cause
> the process to hang.  It sounds a bit like what you're experiencing, so if
> you like you can download the latest HEAD release from
> www.radiance-online.org, and either recompile everything or (simpler) grab
> src/util/rtcontrib.c from the unpacked HEAD and substitute that for the copy
> in your existing source tree, recompiling just rtcontrib.  The code for
> rtrace hasn't changed in any important way, and this should fix it if your
> problem is the same.
>
> Regarding signal 9, some Unix implementations use this uncatchable signal
> to terminate processes that have exceeded their resource limits.  Other
> systems send a specialized signal saying what went wrong, and rtrace would
> catch this and report the problem (e.g., "file size limit exceeded").  If
> your system is just killing the process with signal 9, there's no way to
> really know what's going wrong.  All you can do is check that your resource
> limits are ample to your task.
>
> By the way, Andy only ran into this error when he was using many bounces
> and some rather high parameters in rtcontrib, which caused the ray trees to
> occasionally exceed 2 GBytes in size -- from a single ray!  It's difficult
> to say if this is happening in your case without seeing your parameter
> settings, but it's worth trying to patch rtcontrib in any case as a first
> step.
>
> Best,
> -Greg
>
> > From: David Appelfeld <d.appelfeld at gmail.com>
> > Date: May 19, 2011 4:41:33 PM PDT
> >
> > Hello Greg,
> > I am suspecting the machine little bit, because it stop after different
> time, sometime it got calculation for 4points sometime for 10, etc.
> >
> > In the beginning I had only one script for whole grid and run it on
> 8cores on one node which was the maximum. But there was probably not enough
> memory and it gave me error message that there is not enough allocated
> memory and it went to waiting process but it never restarted. It stopped
> even though I could still see that the the job which I submited to run the
> script was active. Unfortunately I don't remember the whole error message
> correctly.
> > Then I have split the calculation up to more scripts with less cores used
> to save some time and to avoid previous problem. I have run several scripts
> without a problem. Then I have got this message and I have deleted the job
> and resubmitted it again without doing any  changes. Some of the jobs run
> successfully but some just gave this error message and stopped. Again I
> could see that the job was still active but nothing was coming out from
> calculations.
> > As I am writing this I am thinking that the server is getting overloaded
> and pause the calculation and then rtrace can not finish the process.
> > I don't know if this make any sense, but I can try to submit it again and
> hope that it will finish.
> >
> > Could you please say more about signal 9 and if I can do anything with
> it.
> >
> > Thank you
> > David
>
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