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 Is HT bad for chess?

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Dogo
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PostSubject: Is HT bad for chess?   Thu Jul 21, 2011 5:34 pm

Probably you 'know' that Hyper Threading hurts the speed of chess engines as a lot of people say it's like that. In my opinion it's not always true. I use 6 cores (12 threads) processor and I made some tests using 4 popular strong chess programs: Deep Rybka 4, Deep Fritz 12, Critter 1.2 and Houdini 1.5a (which supports only 8 threads)

Each engine was tested in the same position for 30 seconds.

HT on:
Fritzmark: 43.6

Houdini 1.5a (8cpu) 14700 kn/s
Deep Rybka 4 (12cpu) 530 kn/s
Critter 1.2 (12 cpu) 12800 kn/s
Deep Fritz12 (12cpu) 21200 kn/s

HT off: all engines 6 cpus
Fritzmark: 35.37

Houdini 1.5a 15100 kn/s
Deep Rybka4 560 kn/s
Critter 1.2 12000 kn/s
Deep Fritz 12 17150 kn/s

As you can see Critter 1.2 and Deep Fritz 12 like HT, especially Fritz.

Deep Rybka 4 and Houdini 1.5a work better when HT is disabled, but notice if Houdini could use 12 threads it would be faster than on 6 cores.


The very important issue is system. I use Windows 7 Pro 64 bit and I read it is better optimized for HT than other systems. As I found - about 15% better than Vista.

If there is anybody who owns processor that can use HT I would be grateful for confirming that's what I said.
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me4u
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PostSubject: Re: Is HT bad for chess?   Thu Jul 21, 2011 7:06 pm


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PostSubject: Re: Is HT bad for chess?   Sun Sep 18, 2011 2:07 pm

Correction

Forget about what I said here. HT is generally bad, even if there is an increase is engine's speed.
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