Author: Uri Blass
Date: 09:21:42 05/02/01
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On May 02, 2001 at 11:43:10, Robert Hyatt wrote: >On May 02, 2001 at 02:32:27, Chessfun wrote: > >> >> >>>A SMP version of Tiger exists. Actually existed last year. >>>A friend of mine went on a long hollyday last year, and instead of leaving his >>>dual system unused at home, he lent it to me. >>>I developped a SMP version on top of Chess Tiger 12.2. >>>But as I already told several times SMP was not a priority for me. So once I had >>>SMP working, I disabled the code in Tiger's source code. I did not erase it of >>>course, I just deactivated the relevant parts of code. >>>Since then, Tiger has evolved on many points, including a different internal >>>move coding and a different hash table structure. >>>So now I cannot just reactivate the SMP code. It will not work directly. I need >>>to reactivate it and adapt it to what has changed in the latest Tiger engines. >> >>>It's not a lot of work. The principle of the SMP algorithm does not have to be >>>rewritten, it's just a matter of adapting the code. >> >>>I just asked for a little delay in order to do that and to double check that >>>everything was working. >> >>>You can have your doubts about this SMP version, but after all if I send a SMP >>>Tiger that crashes in Cadaques, I will be the one to look stupid, not the >>>organizers of the Kramnik match. > > > >I'm willing to let a lot of hype slip by, but not _everything_. It seems you >are saying you developed an SMP search over a weekend. I have too much >experience with parallel search to believe that. I don't think I could even >steal my SMP code and move it into something like gnuchess in a single weekend, >and get it working reliably. > >Believe me, this is _not_ a weekend task. It is not a month task. It is really >not a year task. > >I would not ever believe there is an SMP Rebel until there is a windows version >of Rebel. DOS is _not_ capable of running on an SMP platform itself, much less >managing threads in any way... I have a _really_ hard time believing that a >robust SMP algorithm is a week-end project, unless I am a far worse programmer >than I believe. It is also possible that there is another way to do programs parallel that other did not think about and I do not know what is the speed improvement that Christophe got from the parallel program. I understand that patzer used a parallel version of their program and it was not hard for the programmer to do it parallel. The speed improvement from 2 processors in that case was 1.2 The interesting question is what is the speed improvement that christophe got from the parallel tiger12.2 Uri
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