[Radiance-general] rcontrib malloc error

[Greg Ward]

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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