[Radiance-general] rcontrib malloc error

[Tim Perry]

Galen,

I'd like to add that Rick is exactly right. An additional note: -lw is more
important for big spaces than small spaces.

--Tim

On Tue, Mar 29, 2016 at 8:27 AM, Richard Mistrick <RGMARC at engr.psu.edu>
wrote:

> Galen,
>
> Here is something else that might improve the quality of your gridpoint
> calculations.  I have seen "-lw 1e-5" to be inadequate in most daylit
> spaces.  I usually drop this to around 1e-9 (and using high -ad settings)
> and get much better results when applying daylight coefficients to sky
> patches (the results are typically higher).  When using a method where the
> direct sun is removed from a sky coefficient calculation that includes both
> sun and sky, to be added in via a third phase, this will generally also
> avoid the presence of negative numbers in the final results.  You can
> easily test the -lw setting to see if it makes a difference.
>
> Rick Mistrick
>
> -----Original Message-----
> From: Greg Ward [mailto:gregoryjward at gmail.com]
> Sent: Wednesday, March 23, 2016 11:21 AM
> To: Radiance general discussion <radiance-general at radiance-online.org>
> Subject: Re: [Radiance-general] rcontrib malloc error
>
> Good catch, Galen!  I'm glad you found the explanation.  Meanwhile, I
> changed the code so that (hopefully) we won't get runaway ray counts even
> if there are surfaces with >100% reflectance or transmittance.
>
> Cheers!
> -Greg
>
> > From: Galen Burrell <Galen.Burrell at arup.com>
> > Subject: Re: [Radiance-general] rcontrib malloc error
> > Date: March 23, 2016 5:48:33 AM PDT
> >
> > Just an update on this error: After searching through my materials
> definitions per Greg's suggestion, I found that I had a glass definition of
> 95% light transmission, which resulted in a transmissivity of > 1.  Doh!
> After reducing the light transmission to something more sensible I stopped
> getting the error.  Thanks Greg!
> >
> > Date: Thu, 17 Mar 2016 14:49:01 -0700
> > From: Greg Ward <gregoryjward at gmail.com>
> > To: Radiance general discussion <radiance-general at radiance-online.org>
> > Subject: Re: [Radiance-general] rcontrib malloc error
> >
> > Hi Galen,
> >
> > I've never seen rcontrib run out of memory in this way before.  What are
> your rendering options for rcontrib?  Do any of your surfaces have greater
> than 100% reflectance or transmittance?  This could cause the number of
> rays to increase rather than decrease on multiple bounces, which could lead
> to exponential memory growth during ray tree evaluation.
> >
> > -Greg
> >
> >> From: Galen Burrell <Galen.Burrell at arup.com>
> >> Subject: [Radiance-general] rcontrib malloc error
> >> Date: March 17, 2016 1:39:45 PM PDT
> >>
> >> I?m running view matrix calculations using rfluxmtx/rcontrib for the
> 3-phase method and keep getting one of two errors:
> >>
> >> 1)
> >> rcontrib(2346) malloc: *** mmap(size=a really big number) failed
> >> (error code=12)
> >> *** error: can?t allocate region
> >> *** set a breakpoint in malloc_error_break to debug
> >> rcontrib: system ? out of memory in samp_hemi: Cannot allocate memory
> >> rcontrib: system ? read error from render process
> >> Killed: 9
> >>
> >> 2)
> >> rcontrib: system ? read error from render process
> >> Killed: 9
> >>
> >> I can?t establish a pattern for why/when these two errors occur.
> >>
> >> Oddly, I don?t always get the error with some gridpoint files (with
> 5900 points), but I consistently get it with another gridpoint file (with
> 7500 points).  I don?t understand why grid size would influence memory
> though??
> >>
> >> System is Mac OS 10.7.5 (2 x 6-core); error repeats on my laptop with
> >> Yosemite installed Latest Radiance HEAD release; although the error
> >> repeats on older versions from 6 months ago rcontrib settings are: ?n
> >> 12 ?ab 12 ?ad 100000 ?lw 1e-5 ?I+
> >>
> >> Any clues on why I?m getting these errors?
> >>
> >> Thank you!
> >>
> >> Galen
>
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