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Re: [ARSCLIST] Hyperthreading (was Software for Mac)

At 11:48 PM 2008-10-17, carlstephen koto wrote:

Thanks Steven, that's why I asked Richard about the hyperthreading
before. I use a quad cored Mac (each processor is 2.6G) and when I'm
processing audio, I open a widget that displays processor usage. When
I run my restoration software (iZotope Rx) or any other intensive
editing processes, only one of the four processors is doing 90% (just
a visual estimate) of the work. If the one processor is "limiting
out" a second processor will momentarily run up to about 50%.The
other three are barely working (running the display and operating
system?).  As a result, my software runs just a little faster than it
would on a single processor.

Hello, Steve,

That was what I saw in the hyperthreading model as well under Windows. Alas, in hyperthreading, it appears that half the CPU cycles are allocated to each thread (as opposed to the multi-core processors), therefore in hyperthreading, I was losing performance with this function activated.

Your report on what the Mac does and what I've seen hyperthreading do under Windows are why I've been staying away from multi-core CPUs which have a big cost with little benefit IN THIS APPLICATION. In fact, I might suggest that other than efficiencies in fewer CPU clock cycles per instruction in the latest processors, that the typical mid-2.5 GHz multi-core processor may not offer any improvement over a 3 GHz single core unit.

It would be interesting to see further data points on this.



Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.

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