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Subject: Re: Hyperthreading vs. dual configuration performance? Somewhat OT

Author: Peter Kasinski

Date: 16:35:08 02/21/03

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On February 21, 2003 at 18:13:12, Robert Hyatt wrote:

>On February 21, 2003 at 09:26:41, Peter Kasinski wrote:
>
>>On February 21, 2003 at 03:32:44, Tom Kerrigan wrote:
>>
>>>On February 20, 2003 at 22:07:12, P. Massie wrote:
>>>
>>>>I'm not an expert on HT, but based on what I've read about it, and what I know
>>>>about how computers work I suspect it will be somewhat better than a "normal"
>>>>processor for this, but not nearly as good as a true dual.  My suggestion would
>>>>be a dual AMD or Xeon.
>>>
>>>Actually, any sort of stuttering/unusability you get from multitasking on one
>>>CPU is because of a poor scheduling algorithm in your operating system (or at
>>>least one that leaves room for improvement). Because HT presents one processor
>>>as two to the OS, that scheduling problem goes away. It would not surprise me if
>>>HT chips were dramatically more responsive (although not that much faster) when
>>>multitasking, although I'm not saying this is a certainty. I have never used a
>>>HT system myself.
>>>
>>>-Tom
>>
>>Indeed, this continues to be my main observation based on the comparison btw P4
>>3.06GHz and a dual P3-933.  Not the raw speed, but responsiveness (under W2k).
>>
>>PK
>
>
>I have quad everythings here, from quad pentium-pros to quad xeon 700's.  _all_
>run very responsively under heavy load.  But _all_ use SCSI drives.  We have a
>few duals with IDE and they are _dogs_.

Good point. The dual P3 is all IDE, while the new P4 has SCSI drives. I gues
there are other factors that could influence reponsiveness. Turning HT off would
be one way to test this.  But why mess with a new PC before the weekend?  :)

PK












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