[Radiance-general] Radiance on Raspberry Pi

[Kyle Konis]

Hi Mark,

This is indeed very interesting. (And very cool, in my opinion!)

I have been looking for a low-cost platform to do HDR image generation (in
the field) with the program HDRGEN, the command-line HDR image builder.

http://www.anyhere.com/

Any idea how long it would take the Pi to composite 7 .JPG images (say
about 1000px by 1000px in dimension) into an HDR image?.

(Then i would do a bit of analysis with Radiance and send some commands to
control physical devices)

Best,

-Kyle


-----------------------------------------------
Kyle Konis, AIA, Ph.D
Assistant Professor
School of Architecture, WAH 204
University of Southern California
Los Angeles, CA 90089-0291
http://arch.usc.edu/faculty/kkonis
-----------------------------------------------




On Sat, Apr 20, 2013 at 12:03 PM, Mark Stock <mstock at umich.edu> wrote:

> For those interested, I built Radiance on a Raspberry Pi yesterday
> (700 MHz single-core ARMv6, 3.5W, 512 MB RAM) and ran the speed test
> from http://markjstock.org/pages/rad_bench.html.
>
> The results are not encouraging, but you don't buy a Raspberry Pi for
> speed. It took 17 hours to finish the rpict portion of the test. The
> best serial time ever recorded was just under 18 minutes on an Intel
> i7-2600K from 1.5 years ago (57x faster). The peak SMP time is 3.5
> minutes, recorded earlier this year (296x faster). The Raspberry Pi's
> time was similar to what we would expect from computers from 2001-2: a
> Pentium II at about 250MHz, or a 400HMz Sun UltraSparc, both which
> regularly sported about 512MB of RAM, but obviously cost about 100x
> more.
>
> 100 Raspberry Pi machines, networked and working in parallel, would
> consume 350W and cost $3500 (not counting networking hardware), both
> numbers in the ballpark of the best current CPU-intensive
> single-workstation systems. Assuming perfect parallelization, it could
> finish in a little over 10 minutes, but a more realistic guess would
> be 15-20 minutes. I'm glad NREL decided to go with the Xeon Phi
> instead of a cluster of RPis.
>
> Maybe I should start a Radiance "speed" test that measures the results
> in Joules instead of seconds.
>
> Mark
>
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