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Rendering in Blender on a machine with multiple GPUs
So here's the premise: For scenes that take around a minute or less to render, performance is actually worse if you render on all of the cards with a single instance of Blender. This is because (AFAIK) there's a bit of additional time necessary to collect the render results from each card and stitch them together. That time is a fixed short duration, so it's negligible on larger/longer render jobs. However, on shorter render jobs, the 'stitch time' has a much more significant impact.
I ran into this with a machine I render on that has 4 Quadro K6000s in it. To render animations, I ended up writing a few little scripts to facilitate launching 4 separate instances of Blender, each one tied to one GPU. Overall rendertime was much shorter with that setup than one instance of Blender using all 4 GPUs.
The setup works basically like this. In my .blend file, I embed 4 text files, batch-render0.py, batch-render1.py, batch-render2.py, and `batch-rende
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Very compact and easy to use timezone + daylight saving table. Data comes from [Oslon timezone database](http://www.iana.org/time-zones) (ver. 2013-04-20).
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