Re: [Bug-gnubg] Performance Gains from 20090915 to 20110525 Codebases

[mpetch]

Quoting Philippe Michel <address@hidden>:

> When I wrote 30-40, I meant depending on the CPU. Your big Xeons are a
> favourable case. I think something like an old Pentium M would profit
> less and a machine without sse instructions would see a gain well below
> 30%.

I think non SSE machines are likely the exception to the norm now a  
days. And I agree that this is specific to my system - was why I made  
it clear the hardware I was using. I do have some tests going with an  
older Core 2 Duo (Yes with SSE). I am effectively suggesting that your  
30-40% improvement is reproducible.

I could run the experiments without SSE but I'm not sure it would be a  
good indicator of most typical usage patterns.

I think it also depends on what type of things you are doing in GNUBG.  
A checquer play rollout of say 46656 trials. Other data I have (most  
doesn't have to do with the performance gains) shows that Number of  
eval threads and cache as well as how many plys an evaluation is done  
at affects performance greatly.

Off topic note: I turned off all the Swap and used a Nice value of -19.