Author: Robert Hyatt
Date: 14:42:29 01/02/04
Go up one level in this thread
On January 02, 2004 at 15:56:36, Juergen Wolf wrote: >On January 02, 2004 at 13:30:09, Robert Hyatt wrote: > >>On January 02, 2004 at 09:57:38, Jasmine Baer wrote: >> >>>I've seen it written that under the following conditions: >>> >>>1. Engine vs. Engine match or tournament >>>2. Held on a single computer with a single processor >>> >>>having ponder=ON(or Permanent Brain in the Fritz GUI) will impact the play of >>>the engines since the each individual engine would not have full access to the >>>processor during its own turn. >>> >>>First, is this true? >> >>yes. Since both engines are running, each should get about 1/2 the >>computational cycles. > >usually yes, if the priority-level is controlled by the GUI and not >overwritten by the engine. i just want to mention this as i have seen >one (weaker) engine resetting the priority-level. > Not a problem in Unix. You can set your priority down, but never up. So you can give the advantage to your opponent, but you can't "take it". > >> >>> >>>Second, is this issue, if it actually is an issue, something that is eliminated >>>by running a two-processor system? >> >>Partially. What about engines that can use _both_ processors? :) >> >> >> >>> >>>And, finally, does anyone have any solid insight on how ponder=off/on or >>>Permanent Brain works on a Pentium 4 with Hyperthreading? >>> >>>Thanks. >> >> >>Same way. PIV with SMT on looks like two slower processors...
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