To Hyperthread?

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Janos (retired)
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#1 To Hyperthread?

Post by Janos (retired) »

Simple question:

Should I turn CPU hyperthreading on or off on a dedicated cruncher?

Janos
PinkPenguin

#2

Post by PinkPenguin »

Leave it on. You still get better throughput than a single CPU by itself though it is more like 1.5 CPUs.

Most BOINC programs need to transfer data and code from memory to CPU so Front Side Bus and Cache configurations are really what makes efficient use of a single CPU.
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Janos (retired)
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#3

Post by Janos (retired) »

Thanks :)
davidbam
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#4 Re: To Hyperthread?

Post by davidbam »

I was about to ask a similar question. I'll leave hyperthreading on having read this.
I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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davidbam
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#5 Re: To Hyperthread?

Post by davidbam »

When I get a moment, I plan to experiment with this as I rather doubt that the improvement is as high as 50% - I am thinking maybe 20-25% but I need to try it for myself
I think this is fool-proof but could you just try it for me please? • There are 10 types of people in the world; those who understand binary, and those who don’t
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Bryan
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#6 Re: To Hyperthread?

Post by Bryan »

On most projects you will get about 30% improvement with HT on. The projects that run really tight code (PG and SRBase) you are better to turn HT off.
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