chessforyou Bettina&Terry77
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» Latest abrok Development Version March 26th (SF The gift that keeps on giving
Is HT bad for chess? EmptyYesterday at 6:19 pm by LondonFrau

» Latest abrok Development Version March 22nd (SF The gift that keeps on giving
Is HT bad for chess? EmptySun Mar 24, 2024 7:05 pm by LondonFrau

» 1337 pro ctg update
Is HT bad for chess? EmptyThu Mar 21, 2024 8:44 am by Guest

» Latest abrok Development Version March 20th (SF The gift that keeps on giving
Is HT bad for chess? EmptyWed Mar 20, 2024 5:45 pm by LondonFrau

» 26 plus elo increase ..Latest SF from Abrok March 14th The gift that keeps on giving
Is HT bad for chess? EmptySun Mar 17, 2024 1:41 pm by LondonFrau

» Latest SF from Abrok March 7th
Is HT bad for chess? EmptySun Mar 10, 2024 5:52 pm by LondonFrau

» Stockfish 16.1
Is HT bad for chess? EmptySun Mar 03, 2024 2:33 am by LondonFrau

»  Update default main net to nn-b1a57edbea57.nnue Febuary 17th (SF The gift that keeps on giving
Is HT bad for chess? EmptyTue Feb 20, 2024 2:41 am by LondonFrau

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 Is HT bad for chess?

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Dogo
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Dogo


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Is HT bad for chess? Empty
PostSubject: Is HT bad for chess?   Is HT bad for chess? EmptyThu 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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Is HT bad for chess? Empty
PostSubject: Re: Is HT bad for chess?   Is HT bad for chess? EmptyThu Jul 21, 2011 7:06 pm

Is HT bad for chess? 617126

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Dogo
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Is HT bad for chess? Empty
PostSubject: Re: Is HT bad for chess?   Is HT bad for chess? EmptySun 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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