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HyperThreading Good or Bad...
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Yogesh S (VIP)
Hi,

We have a mission critical trading application running on 8 CPU ( P-IV 2.8 Ghz) with Hyperthreading enabled that gives us 16 logical CPU... most of our applications needs to be behave in a timely manner even a 2 or 3 second lag sometimes hurts organization P&L sheet...

based on my understanding after reading below articles... even intel itself says applicatins may gain 10-30% perf improvement but depends on application and situation

http://www.2cpu.com/articles/43_3.html
http://www.2cpu.com/articles/ht_explored/ht_2.html
http://arstechnica.com/paedia/h/hyperthreading/hyperthreading-1.html

Can anyone shed a light on their personal views ? given a choice would you run your application in HT or Non HT mode..? i know its an open question as we ourselves are now planning to switch off HT and run application in Non HT mode ..
and closely observe application behaviour

but would be glad if anyone could share their experiences or any specific tips applicable to heavily multi-threaded and time critical application running in HT mode.

Thx...

Regards
Yogesh S
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Miha Markic [MVP C#]
Hi Yogesh,

My (only) theoretical knowledge says that HT may gain you something or loose
you something.
Since it is a sort of hack into the procesor I guess it really depends on
how your application behaves.
I have no better suggestion than to try it yourself and compare the results.
Nothing that you didn't already know, eh?

--
Miha Markic [MVP C#] - RightHand .NET consulting & development
miha at rthand com
www.rthand.com

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Alvin Bruney [MVP]
It's not a hack - at least by conventional standards.

I've been reading the white paper. What jumps out at me is that HT can offer
signficant gains depending on how it is implemented. The paper indicates
that contention for shared resources among threads is a critical factor.
Based on that, I wouldn't expect an 'across the board' improvement with
hyperthreading since the application needs to be written appropriately.

The paper is a good read by the way.

--
Regards,
Alvin Bruney
[ASP.NET MVP http://mvp.support.microsoft.com/default.aspx]
Got tidbits? Get it here... http://tinyurl.com/27cok
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Raymond Lewallen
Where can I find the whitepaper?

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Yogesh S (VIP)
Thx guys for the reply... will be doing a detail anaysis on thursday/friday..
will definitely post my observation

Raymond : white paper link

http://www.2cpu.com/articles/43_3.html
http://www.2cpu.com/articles/ht_explored/ht_2.html
http://arstechnica.com/paedia/h/hyperthreading/hyperthreading-1.html

"Raymond Lewallen" wrote:

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