[Bf-committers] Cycles performance

Mike Pan mike.c.pan at gmail.com
Mon Mar 5 23:26:02 CET 2012

Not to start another OS debate. But...

I noticed that the performance of Cycles is very OS-dependent. With the old
rendering engine, the OS can influence the rendering time by ~10%. But with
Cycles, i am seeing a huge difference in performance between Windows and
Linux/Mac, where Linux/Mac is often twice as fast.

This cleaned up chart by
shows the discrepancy:

I've done my own dual-boot test and the results as as follows:

Cycles Render: (huge difference in render time)
OS X: 3:27
Win 7: 6:14

Classic Render: (similar time, as expected)
OS X: 1:24
Win 7: 1:29

Both OS are running natively (not under virtual machine), using the 64bit
version of Blender 2.62.

My question is, Is there any technical reason behind this? thread
management? malloc overhead?


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