"Broken pipe" message on multi-core systems

Anyone seen this message on rad-generated rpiece runs lately? I just saw on one of the eight-core systems on our big cluster and I'm wondering if anyone else has seen it.

I'm running the CVS version of Radiance, so it could be that I just built on a bad day.

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Randolph M. Fritz • [email protected]
Environmental Energy Technologies Division • Lawrence Berkeley Labs

Hi Randolph,

This shouldn't happen, unless one of the rpict processes died unexpectedly. Even then, I would expect some other kind of error to be reported as well.

-Greg

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From: "Randolph M. Fritz" <[email protected]>
Date: July 7, 2011 4:38:41 PM PDT

Anyone seen this message on rad-generated rpiece runs lately? I just saw on one of the eight-core systems on our big cluster and I'm wondering if anyone else has seen it.

I'm running the CVS version of Radiance, so it could be that I just built on a bad day.
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Randolph M. Fritz • [email protected]

Hi Randolph,

This shouldn't happen, unless one of the rpict processes died unexpectedly. Even then, I would expect some other kind of error to be reported as well.

-Greg

Thanks, Greg. I think that's what happenned; in fact seven of the eight died in two cases. Wierdly, the third succeeded. If I run it as a single-processor job, it works. Here's a piece of the log:

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On 2011-07-07 16:54:06 -0700, Greg Ward said:

        rpiece -F bl_blinds_rpsync.txt -PP pfLF5M90 -vtv -vp 60.0 -2.0 66.0 -vd
12.0 0.0 0.0 -vu 0 0 1 -vh 60 -x 1024 -y 1024 -dp 512 -ar 42 -ms 3.6 -ds .3 -dt .1 -dc .5 -dr 1 -ss 1 -st .1 -af bl.amb -aa .1 -ad 1536 -as 392 -av 10 10 10 -lr 8 -lw 1e-4 -ps 6 -pt .08 -o bl_blinds.unf bl.oct

rpict: warning - no output produced

rpict: system - write error in io_process: Broken pipe
rpict: 0 rays, 0.00% after 0.000u 0.000s 0.001r hours on n0065.lr1
rad: error rendering view blinds

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Randolph M. Fritz • [email protected]
Environmental Energy Technologies Division • Lawrence Berkeley Labs