Hello group,
If I have a Quad Core 720QM for computer chess is it better to leave HT off or HT on. In addition, how do I turn HT off and on. I will be using Windows 7.
Thank you,
Sean
Hyper Threading On or Off ??
- Sean Evans
- Posts: 173
- Joined: Fri Jun 11, 2010 1:21 am
- Real Name: Sean Evans
-
- Posts: 1242
- Joined: Thu Jun 10, 2010 2:13 am
- Real Name: Bob Hyatt (Robert M. Hyatt)
- Location: University of Alabama at Birmingham
- Contact:
Re: Hyper Threading On or Off ??
It is OK to leave it on, if the operating system is smart. For example, if you have a quad-core chip, with hyper-threading on it will look like 8 cores to the operating system. You would never want to run 8 threads with a chess program, but if you run just four, Linux (for example, as I do not know about windows) will schedule each thread on a different physical core. It would be terrible if it scheduled the 4 threads on two cores since it would still see 4 processors being used, but each two logical processors share everything and do not execute parallel things very efficiently compared to separate real processors.Sean Evans wrote:Hello group,
If I have a Quad Core 720QM for computer chess is it better to leave HT off or HT on. In addition, how do I turn HT off and on. I will be using Windows 7.
Thank you,
Sean
If you are not sure, I'd turn it off. And I would always turn "turbo-boost" off. It's a crock that screws up all sorts of benchmark timing information.
Re: Hyper Threading On or Off ??
Specifically for Rybka, it hurts, unless you set up affinities manually.
-
- Posts: 1242
- Joined: Thu Jun 10, 2010 2:13 am
- Real Name: Bob Hyatt (Robert M. Hyatt)
- Location: University of Alabama at Birmingham
- Contact:
Re: Hyper Threading On or Off ??
Ovyron wrote:Specifically for Rybka, it hurts, unless you set up affinities manually.
Just need a good operating system.
![Laughing :lol:](./images/smilies/icon_lol.gif)