Author: Bruce Moreland
Date: 13:18:21 09/26/01
Go up one level in this thread
On September 26, 2001 at 14:25:50, Gian-Carlo Pascutto wrote: >I have been wondering about my engines speed lately. > >Right now, I do about 110 knps in the middlegame on >an Athlon 1000. > >Is that good or bad? Well, everybody else (save the one >engine that shall not be named) seems to be doing more, >so it can't be very good ;) > >Programs like Crafty do about 700 knps on the same >hardware. ExChess (which has a similar design to >my engine) does about 250-350 knps. > >I couldn't care less about the actual NPS value, but >I do seem to get outsearched sometimes, which is quite >annoying. Especially since my eval isn't of the most >sophisticated either. Makes me shiver about the idea >of adding some of the more expensive terms. > >A simple explanation would be that I just suck at >programming and my program is slow. That would be >plausible, if it weren't for 2 facts: > >a) with material only eval I do +- 300 knps >b) I 'perft' a few percents faster than crafty > >I did a few more experiments (no SEE, futility pruning) >and I hardly go over about 350 knps. That's still >half the speed of crafty, with _everything_ enabled. > >I'm baffled as to where all those NPS come from/disappear >to. The only area where Crafty would hold the advantage is >capture-only movegen. > >My standard movegen does about 450 000 calls per second (testpos: LCT2 pos1). >Capture only makes that 600 000 calls per second. I could >see how crafty is faster here. (anyone care to test how >much?) However, I don't see how this could be enough to >compensate for the huge difference even without an eval >on my part! Crafty is _searching_ faster than I can generate >moves! > >So, basically, where are all those NPS coming from? > >You guys have a 'nodes <<= 2;' somewhere? It sounds like you need to spend some quality time with your profiler. It's possible that you are doing one dumb thing, and you can just fix that and go like blazes. It's more likely, with a pretty new program, that everything is slow, but at least you can figure out what the slowest thing is and fix it. bruce > >-- >GCP
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