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"Thorsten Froehlich" <tho### [at] trf de> wrote:
> You cannot use CPU usage window to see how much processor time a specific
> application consumes. All you see there is the time-average over a second
> or more that each processor was used. Applications will be executed on
> either several times a second. Use the Activity Monitor so see how much an
> application uses on each processor. POV-Ray only uses one thread for
> rendering, and hence will only use one CPU.
I finally received the 2.5 GHz dual G5 I ordered June 28. So far it looks
pretty good. I've added RAM to total 3 gig.
A quick run of the benchmark (POV-Ray 3.6.0) shows it runs about 7.5
times faster than my previous machine, a 550 MHz PowerBook. Here
are my times, just using the pull-down Render benchmark.
Optimized for G4 25:51
Optimized for G5 25:07
Nothing out of this world, my uncle's (much less expensive :-) AMD 2800+
comes within a couple of minutes of this time, but I really enjoy being able
to do other things while rendering, and I like OS X. I also notice some
amazing numbers for CineBench; if I ever get Cinema 4D it will be very fast.
Running the Activity Monitor shows some strange results as the processors
appear to share the work, one running at 100% for about a second, then
swapping to the other processor 100%. I have no idea how accurate it is;
I set it to update every 0.5 seconds but it appears to display only every
second. My experience at work with SGI multiprocessor code shows great
improvements in speed by locking a process to a processor, but that's a
completely different system.
I wonder if this processor swapping is hurting performance on dual G5's?
(Assuming the Activity Monitor display is accurate.)
-Mark Slone
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