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"jhu" <nomail@nomail> wrote:
> Alain <aze### [at] qwerty org> wrote:
> > > Quite impressive. I just bought an Athlon II x4 (thank you AMD for maintaining
> > > backwards compatibility!) and wanted to see how fast thing thing was. One
> > > interesting test I did was to render a particular scene using 3.6 with 4
> > > instances vs. 3.7. I was expecting the render times to be about the same. Yet,
> > > 3.7 took half the time that 4 instances of 3.6 did. What's allowing this speed
> > > up?
> > >
> > >
> >
> > With 4 instances of 3.6, it takes 4 times as much memory. You may start
> > swaping. You need to parse 4 times, and only once with 3.7.
> > With 3.7, data collected by a core can be reused by the others, that's
> > impossible in 3.6 and multiple instances.
>
> No radiosity in the scene. Also, definitely no swapping since I have 4GB and the
> scene only uses 200MB max. I thought it might be memory issues, but I then
> compared the test scene on 3.6 running one instance vs. running 4 instances and
> they all finished at the same time.
....
for a fair comparison, each instance of 3.6 should be rendering 1 corner of the
image divided by 4. It's roughly what 3.7 does automatically (to as many cores
as you have).
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