Chris Cason <del### [at] deletethistoopovrayorg> wrote:
> Andycadd wrote:
> > I use a dual 2.4 Xeon Hyperthreading 400mhz FSB
> >
> > SSE is 15% faster consistently
> > 2 threads is 1-1/2% faster than 4
> >
> > Is this normal?
> >
> > Is there a circumstance when SSE is not faster?
> > The output png files look identical and have the same size.
> >
> > Is there a circumstance when 4 threads is faster than 2?
> > The output png files look identical and have the same size.
>
> How are you timing this? Are you looking at the CPU time or the elapsed time?


Elapsed times

weird that 2 threads is faster than 4

I got the same SSE improvement in beta 15
but those were all 4 threads (default) I think

no other stuff running   100% priority


>
> Be aware that Windows lies about CPU time used when hyperthreading is
> enabled, and there's little we can do about it right now. It will typically
> show something like double what it should show, provided all CPU's (real and
> virtual) are used.

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