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Subject: Re: Parallel algorithms in chess programming

Author: Eugene Nalimov

Date: 19:53:34 04/16/01

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On April 16, 2001 at 22:07:10, Robert Hyatt wrote:

>On April 16, 2001 at 18:15:52, Dieter Buerssner wrote:
>
>>In a different discussion, Vincent wrote the following:
>>
>>>It is not difficult to implement the form of parallellism as used by
>>>Rudolf. Invented by a frenchman who couldn't spell a word english and
>>>who wrote an impossible article for JICCA (did anyone proofread it at
>>>the time as i'm pretty sure they didn't get his parallel idea?).
>>>
>>>At the time when i read the article i was pathetically laughing about it
>>>actually as i also didn't get the idea of the frenchman. But it appears
>>>everyone who can make a chessprogram work under win2000 can also get
>>>within an afternoon his program parallel to work. Then some debugging
>>>and a day later it works cool.
>>
>>I'd be very interested in this algorithm, that can be implemented at an
>>afternoon :-)
>>
>>Could you point elaborate on this.
>>
>>BTW. In Paderborn, Roland Pfister also told me, that he knows this from Rudolf
>>Huber, and he even started to explain it to me. Somhow, we (or me) got
>>distracted, and I cannot remember the essential things.
>>
>>What I remember is, that the time consuming work, of making your
>>search/evaluation routines free from all those global variables is not needed.
>>
>>Regards,
>>Dieter
>
>
>Global variables will _always_ be a problem.  Unless you avoid threads
>altogether and use separate processes.  But then you incur other penalties
>you have to solve...

Visual C allows you to declare the global variable as "thread-specific", i.e.
each thread will have its own copy of the variable. Compiler generates special
code to access such a variables.

Eugene



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