One core , better than 4?

[bupalo]

Is it possible that the engines behave better with one core with 4 times calculating compare to 4 cores?

That's becuase with one core they see better the crtical moves

[jdart]

No, in general engines do not do better with one core vs. 4.

But once you start using multiple cores, you will see a lot of variability in search results. Sometimes you get a lot of speedup in finding a key move, sometimes you don't. It is random because the order in which threads are scheduled can affect the solution time.

--Jon

[tjfroh]

Well said Jon. I enjoy Arasanchess very much. I was under the impression that four cores would, in general, give a threefold increase in NPS. The more cores would yield less improvement per core. Most important is a well-written program. TJF

No, in general engines do not do better with one core vs. 4.

But once you start using multiple cores, you will see a lot of variability in search results. Sometimes you get a lot of speedup in finding a key move, sometimes you don't. It is random because the order in which threads are scheduled can affect the solution time.

--Jon

[hgm]

I think you missed a critical part of his question:

1 core with 4 times calculating

[bupalo]

i can post results where stockfish one core performs better than 4 cores

[Laskos]

I think you missed a critical part of his question:

1 core with 4 times calculating

Yes, I think he missed that, and the reply is that 1 core 4x time calculating on average is definitely better than 4 cores 1x time calculating.