Thorsten Froehlich <tho### [at] trfde> wrote:
> The Windows version detects the number of processors Windows reports and 
> asks for twice as many threads.  Apparently two threads per (virtual) CPU 
> gives better performance than just one at least on Windows.

  I tried rendering some scenes with 1, 2 and (the default) 4 threads
here (Pentium4). Rendering with 2 threads showed a speed increase of
approximately 20% (which is actually quite good, knowing how the
hyperthreading of P4 works). Rendering with 4 threads didn't speed
up considerably compared to 2 threads, but in some cases there was
perhaps a minor speedup (something like 1-2%), so I suppose 4 threads
is indeed slightly better than 2.
  I didn't test quite extensively, though (ie. with many varied scenes
with different rendering settings).

-- 
                                                          - Warp

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