Author: Robert Hyatt
Date: 21:08:31 12/20/01
Go up one level in this thread
On December 20, 2001 at 19:34:37, Michael Fuhrmann wrote: >On December 20, 2001 at 14:44:18, Robert Hyatt wrote: > >>On December 20, 2001 at 14:07:28, David Rasmussen wrote: >> >>>On December 20, 2001 at 13:38:02, Robert Hyatt wrote: >>> >>>>On December 20, 2001 at 07:17:31, Jouni Uski wrote: >>>> >>>>>When I play Crafty 18.10 against Yace under Winboard 4.2.3 with 60 moves in >>>>>1 or 3 minutes, in almost all games Crafty seems to lose from time (Winboard >>>>>says flag fell)? Actually it's only matter of may be fraction of second, but >>>>>still... >>>>>Has others noticed that? I remember Bob said Crafty never loses on time, but >>>>>here it does... >>>>>(I play with ponder off) >>>> ^^^^^^^^^^^^^^^^^^^^^^ >>>> >>>>What more can I say? :) >>>> >>> >>>Why would playing with ponder off make the program lose on time?? I don't see >>>the relation at all. >>> >>>/David >> >> >>Because it _assumes_ it will save time here and there by "pondering" correctly >>and it adjusts the time target for each move based on this assumption. But >>the assumption is _wrong_ since it isn't pondering at all. The time allocation >>for ponder=off simply needs more tuning. But I don't _ever_ play serious games >>with ponder=off so I never test or tune for that... > >Still, when using just one machine to play comp-comp games under winboard, isn't >it advisable to have pondering off? It is a sticky issue. With ponder=off, you alter the time allocation per move Crafty uses, which can cause time trouble near time controls. With ponder=on, everything runs normally since both programs get 1/2 of the processor. _until_ something happens. IE one program doesn't have a PV move to ponder, and can't find a hash move either. It just sits. While Crafty has a special search it will do to get a move to ponder, when all else fails. And while one is not pondering, the other suddenly finds the machine twice as fast. Which can also skew the results... Either way has its associated problems. Best of both worlds is a dual cpu machine with each program using one cpu only.
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