[Radiance-general] "Broken pipe" message from rpiece on multi-core Linux system

[Jack de Valpine]

Hey Randolph,

I have run into this before. Unfortunately I have had limited success in 
tracking down the issue and also have not really looked at it for some 
time. If I recall correctly, a couple of things that I have noticed:

  * possible problem if a piece finishes before the first set of pieces
    are parcelled out out by rpiece - so if it 8 pieces are being
    distributed at startup and piece 2 (for example) finishes before one
    of pieces 1, 3, 4, 5, 6, 7, 8 has even been processed by rpiece or
    while rpiece is still forking off the initial jobs.

Sorry I cannot offer more, I have spent some time in the code on this 
one and it is not for the faint of heart to say the least.

-Jack

-- 
# Jack de Valpine
# president
#
# visarc incorporated
# http://www.visarc.com
#
# channeling technology for superior design and construction


On 4/9/2012 3:29 PM, Randolph M. Fritz wrote:
> This problem is back for a sequel, and it would really help my work if 
> I could get it going.
>
> It's been a few months since I last asked about this.  Has anyone else 
> experienced this in a Linux environment?  Anyone have any ideas what 
> to do about it or how to debug it?
>
> /proc/version reports:
>  Linux version 2.6.18-274.18.1.el5 (mockbuild at builder10.centos.org) 
> (gcc version 4.1.2 20080704 (Red Hat 4.1.2-51)) #1 SMP Thu Feb 9 
> 12:45:44 EST 2012
>
> Randolph
>
> On 2011-07-08 01:13:01 +0000, Randolph M. Fritz said:
>
>> On 2011-07-07 16:54:06 -0700, Greg Ward said:
>>
>>> 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:
>>
>>> 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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