09-27-2005, 04:13 AM
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New Member
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Join Date: Sep 2005
Posts: 4
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Hi, I have dual CPU (Xeon 2.8 Nocona) server. The machine is running apache with php, mysql, ftpd. Is it reasonable to turn HT on or off? What will give me the best performance?
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09-27-2005, 04:19 AM
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Web Hosting Guru
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Join Date: Mar 2003
Location: tail -f /var/log/nerd
Posts: 318
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From what I remeber it is not a good idea to run Hyper Threading in a production hosting environment.
Why... I can not remember. 
Google it...
C
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09-27-2005, 05:07 AM
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Community Liaison
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Join Date: Mar 2003
Posts: 8,284
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It all depends.
We have servers that are HT enabled and it is running smooth and fast. It is really depends on what application you are running. You should monitor it, enable then disable to see the difference.
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09-27-2005, 06:46 AM
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Retired Moderator
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Join Date: Jan 2001
Posts: 2,603
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Turn it off. Hyperthreading is a security risk, and provides little if any benefit in most server environments.
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09-27-2005, 04:40 PM
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Web Hosting Master
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Join Date: Jan 2003
Posts: 1,715
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HT improves latency at the expense of throughput, which can be a nice advantage in some environments. Nothing you mentioned is latency-sensitive, so leave it off for better throughput.
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09-27-2005, 11:48 PM
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Remote hands for Los Angeles
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Join Date: Feb 2003
Location: Los Angeles, CA
Posts: 2,490
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What about for P4's?
with webhosting in mind, cpanel.
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09-28-2005, 04:44 AM
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Junior Guru Wannabe
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Join Date: Sep 2005
Posts: 59
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HT is in fact of a very little, negligible security risk and can give you a visible performance grow in hosting tasks (running a multiple processes at a time is a requirement for them).
I recommend to turn in on.
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09-28-2005, 04:48 AM
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Web Hosting Master
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Join Date: Aug 2005
Location: Oxford, England, UK
Posts: 828
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HT actually has a negative impact on MySQL performance 
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09-28-2005, 05:06 AM
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Junior Guru Wannabe
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Join Date: Sep 2005
Posts: 59
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Any proof?
And mysql is not the only application there.
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09-28-2005, 05:14 AM
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Junior Guru Wannabe
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Join Date: Sep 2005
Posts: 59
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Here are comparison of HT and HT-less work of MySQL: http://www.2cpu.com/articles/41_4.html
HT DOES kick ***! :-D
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