i7 and parallel alpha-beta

[hcyrano]

hi,

have you stats on performance logical threads?

ex: 4:5/6/7/8 threads with i7 Quad.

thx

[bob]

hi,

have you stats on performance logical threads?

ex: 4:5/6/7/8 threads with i7 Quad.

thx

Do not do it. You will see a slight improvement in overall NPS, but the trees will grow by much more than that and make this an overall slowdown. I tested on a quad i7 for a month or so back in the Spring. hyper-threading is simply a no-no. You can safely turn it on if you are using linux (not sure about windows) if you only use 4 threads for your search. Linux is quite good about making sure that if you have 4 cores, each with hyperthreading on, and 4 threads, it will run one thread per core to produce max performance.