Author: Robert Hyatt
Date: 15:02:36 04/25/00
Go up one level in this thread
On April 25, 2000 at 05:59:45, Bas Hamstra wrote: >On April 25, 2000 at 01:33:45, Tom Kerrigan wrote: > >>On April 25, 2000 at 01:32:48, Tom Kerrigan wrote: >> >>>On April 25, 2000 at 01:20:11, Bas Hamstra wrote: >>> >>>>(Currently I myself have started all over trying to make a really fast rotated >>>>BB program. Looks promising so far: make/unmake=2M/sec and movegeneration=12M >>>>moves/sec on a Celeron 466) >>> >>>My program does gen/make/unmake at 2M/sec, and just gen at ~10M/sec. >>> >>>I'm not using any sort of bitboards. >>> >>>Maybe something to consider... >>> >>>-Tom >> >>Whoops, forgot to mention that I have a Celeron/400. >>-Tom > >I am not very familiar with these type of statistics. What exactly does that >"gen/make/unmake" mean? Gen all moves and then making/unmaking each? But what >does it SAY..? I am afraid not much for my type of program. Here is why. > >- I have distinct functions gencaps() and gennoncaps() >- Profiler says caps() is called 10x as much called as noncaps() >- So 90% the time all the work of gen() is only to find a capture that gives a >cutoff. Regardless if you distinct them or not. > >So you can maybe extremely fast gen+make+unmake all moves. But what *I* want to >know is "how many times/sec" can I do a capgen(), since that has to be done >practically *every* node. > >And since it don't seem to matter a lot timewise if I generate 3 or 5 captures, >I simply measure the above TotalCapGens/sec. Maybe we can compare (same hardware >anyway): > >after e4 e5 Nf3 Nf6 Nc3 Nc6 Bc4 Bc5 > >I can do a CaptureGen() 800k times a second. I am interested in what others >have, especially 0x88 and non-rotated BB programs. > > >Regards, >Bas Hamstra. that was a good data point. I do the same thing of course, but I often forget to point out that total move generation is not that frequent, that often captures are enough. I just had crafty annotate a whole game at 40 secs/move, with profiler turned on, to see where the speed is going nowadays. The data you mentioned looks like this in this particular profile run: Generate Captures: 98.3M calls Generate non-captures: 8.6M calls Generating only captures is something bitboards excel at, and it is obviously important, as opposed to the total move generator speed which is not done even 10% of the time.
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