From: Greg Ercolano <erco@(email surpressed)>
Subject: Re: Maya 2011.5 rendering differently on farm vs locally
   Date: Mon, 28 Mar 2011 20:41:20 -0400
Msg# 2074
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Jeffrey Jasper wrote:
> [posted to rush.general]
> 
> This one is stumping me. We have been having a lot of weird Maya 2011  
> mental ray rendering issues. But rendering on our rush farm seemed more  
> reliable till we upgraded to 2011. I even patched to 2011.5 and am still  
> having issues.
> 
> Local render render fine. If I submit them to the Rush queue all frames  
> will render with no errors. At first we got some renders where it looked  
> like textures had shifted around on the object. Then we got some where the  
> frame only had some white horizontal lines going through the image files.  
> If I set a scene to render on one of the nodes from the Maya interface it  
> all renders fine.

	Can you email me directly (do not post to the group) your .common.pl
	and submit-maya script you're using?

	Some other info:

	1) Does the problem happen only on particular machines,
	   or is it random? (ie. if you re-render that same frame on
	   the machine it rendered badly, it works fine the second time?)

	2) Can you replicate the problem easily,  or does it happen infrequently?

	3) Does more than one instance of maya/mray run on a machine
	   at a time? (depends on the combo of your rush/etc/hosts file
	   settings and/or your Cpus: specification)

	4) Try telling rush to render the job on one render node
	   (ie. Cpus: somehost=1)

	   Does that render OK?

	   If so, then try adding more processors to the job until
	   the problem starts happening. (Try limiting the job to only
	   use one instance per machine on many machines, vs multiple
	   instances on one machine)

	   See if you can find a pattern.

	5) You mentioned some white horizontal lines through the image.
	   Are these 'scanline errors' that seem to run through the entire
	   image, as if the image was corrupt, or does the line follow
	   geometry (ie. cracks in texturemaps or at geometry boundaries)

	   If scanline errors, sounds like a problem writing to the
	   file server; make sure you don't have a situation where two
	   or more jobs are rendering the same frame at the same time
	   (ie. a left over job is still running while the same job
	   is resubmitted again), or check your file server and client
	   system logs to see if the network file system is choking.
	   at around the same time the images in question were being rendered,
	   to see if there's file system corruptions due to network or server load.

-- 
Greg Ercolano, erco@(email surpressed)
Seriss Corporation
Rush Render Queue, http://seriss.com/rush/
Tel: (Tel# suppressed)ext.23
Fax: (Tel# suppressed)
Cel: (Tel# suppressed)

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