Author: Larry Griffiths
Date: 10:28:46 09/27/00
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On September 27, 2000 at 12:29:01, Vincent Diepeveen wrote: >On September 26, 2000 at 13:51:17, Larry Griffiths wrote: > >>I was looking at these URL's. >> >>http://members.tripod.com/~RyanMack/computer.htm >>http://members.tripod.com/~RyanMack/hypertech.htm >>Does this look promising for bitboards? > >>Larry. > >The guy who wrote this nonsense is completely sick and >knows very little from software and even less from hardware. > >First of all he doesn't seem to know the difference >between assembly and between c++, secondly he's confusing >generation speed of a program with search speed. > >Note that DIEP GENERATES about 15.5M nodes a second on a 450Mhz PII >processor, but that its search speed is a 1000 times less. > >Searching at a couple of million nodes a second in an efficient way >is simply impossible when using alfabeta+nullmove with a quiescencesearch. Tell me about it. my 1.5 million nodes a second drops to 300-500 thousand nodes per second with ab+qs. > >just minimaxing is of course no problem, but you'll end up searching >6 ply or so then. > >like 100 clocks a node in assembly at the intel processor is impossible, >especially with bitboards. > >Also he quotes Bob wrong. You don't suffer 15-20 penalties from a memory >reference, the latency of fast 133Mhz SDRAM is already more than that. > >The fastest 133Mhz SDRAM-222 needs 7.5ns x 10 = 75 clocks latency. > >The fastest PC800 memory needs 1.25ns x 15 = about 19 clocks latency > >Now we didn't talk yet about the 266PII with the real slow 66Mhz SDRAM >which this guy has... > >If 'his' hyperbola suffers penalties because of misprediction, and you sure >will suffer a lot of those when searching, then you suffer for each >misprediction at least 10 clocks. A few branches and you're already >slower as what he quotes. > >This guy is completely crazy and nuts and he sure knows nothing from >programming. Sounds more like a lunatic who has written some stupid nonsense >and i sure don't know why and what for, but it looks more like a vendetta >against Bob for no reason. Thanks for the post, Vincent. I was thinking that about half of it is nonsense... Larry.
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