Delfi, Multiprocessor support

[Tony Thomas]

Did anyone had any idea that Delfi supported Multi-processors? I dont remember seeing any testing group testing the engine with more than one processors. I just saw that while changing the absolute score in the configuration file. May be this is a new feature..

Later
Tony

[beachknight]

just noticed, Tony.

I'll try with

CPU_THREADS=2

and

CPU_THREADS=4

later.

best,

[Graham Banks]

Did anyone had any idea that Delfi supported Multi-processors? I dont remember seeing any testing group testing the engine with more than one processors. I just saw that while changing the absolute score in the configuration file. May be this is a new feature..

Later
Tony

My understanding is that it can use either 1CPU or 2CPU.

[Tony Thomas]

Did anyone had any idea that Delfi supported Multi-processors? I dont remember seeing any testing group testing the engine with more than one processors. I just saw that while changing the absolute score in the configuration file. May be this is a new feature..

Later
Tony

My understanding is that it can use either 1CPU or 2CPU.

That's what I thought as well. Keep this a secret from Harun, let him figure that out the hard way..

[terminator]

Code: Select all

;
; The Hash Table size is expressed in megabytes (4..64)
; The Pawn hash table is 2 Mb. Delfi needs further 5 Mb for its processing.
;

HASH_TABLE=16

It is rather strange to assume that hash table can only be set from 4 to 64 Mb. Even Windows 95 could handle more memory than that. Can the source be altered to allow it to handle more memory. I suppose this is what you get if people want to cling to the archaic winboard protocol.

The Crafty people may not be interested in their program anymore but is has better "configurability" than the likes of Delfi.

[Zach Wegner]

I suppose this is what you get if people want to cling to the archaic winboard protocol.

That has absolutely nothing to do with the winboard protocol.

[gerold]

Code: Select all

;
; The Hash Table size is expressed in megabytes (4..64)
; The Pawn hash table is 2 Mb. Delfi needs further 5 Mb for its processing.
;

HASH_TABLE=16

It is rather strange to assume that hash table can only be set from 4 to 64 Mb. Even Windows 95 could handle more memory than that. Can the source be altered to allow it to handle more memory. I suppose this is what you get if people want to cling to the archaic winboard protocol.

The Crafty people may not be interested in their program anymore but is has better "configurability" than the likes of Delfi.

I have been using it uci with a lot more hash. Play a few games
with it and you will see it is an exciting program.

[Denis P. Mendoza]

Delfi is a software suite composed of three programs to help your training in chess.
The current version is 5.3 [2008/06/27], dual core processors are now supported.

RELEASE NOTES

Version 5.3, 2008/06/27.

Many evaluation improvements.
Option for dual core CPUs, 1.5X speedup.
Fixed a bug in UCI pondering.
Restored "perft" command.

Code: Select all

Delfi 5.3 - 2008/06/27

Chess engine for Winboard/UCI.
For more info: http://www.msbsoftware.it/delfi

Installation:
1) To play with the Winboard version ("Delfi.exe") you need
to download and configure Winboard:
http://www.tim-mann.org/xboard.html
2) To play with a UCI chessboard (Fritz, Arena, Chessbase, etc.)
see your chessboard instructions.

Easy levels:
To set a easy level modify the file Delfi.ini, (standard version
is limited to 1000 ELO or full strength).

Parallel version:
To enable parallel processing on dual core processors set
the option CPU_THREADS in Delfi.ini

Author:
Dr. Fabio Cavicchio.
All right reserved.

Code: Select all

;
; Delfi -  Chess engine for Winboard and UCI interfaces.
;
; Author:  Dr. Fabio Cavicchio.
; For more info:  http://www.msbsoftware.it/delfi
; All rights reserved.
;
;
; ******** EASY LEVELS ******** 
;
; The ELO is a measure of ability in chess.
;
;        600 = Random mover(!)
; 1000..1200 = beginner
; 1200..1400 = Weak club player
; 1400..1700 = Average club player
; 1700..1900 = Strong club player
; 1900..2100 = Candidate master
; 2100..2300 = Master
;
; To set the ELO strength in DelfiT (1000..2300) modify the setting below:
;
; Example:  ELO_STRENGTH=1125
;
; Don't set values beyond these limits, they won't be accepted.
; The ELO strength is not affected by the CPU speed.
; To set max strength write ELO_STRENGTH=MAX (more than 2600 ELO)
; 
; The standard version of Delfi plays only at 1000 ELO (or full strength)
; 

ELO_STRENGTH=MAX


;
; The RESIGN value is expressed in pawn values.
;

RESIGN=7


;
; The Hash Table size is expressed in megabytes (4..64)
; The Pawn hash table is 2 Mb. Delfi needs further 5 Mb for its processing.
;

HASH_TABLE=16


;
; CPU_THREADS: set to 2 to enable parallel processing on dual core
; processors. This feature is currently experimental, the speedup
; is 1.5X

CPU_THREADS=1


;
; ABSOLUTE_SCORE: set to 1 to display score relative to white, set to
; 0 to display score relative to Delfi.
;

ABSOLUTE_SCORE=1

These infos from Fabio may help.

[beachknight]

After first twenty games, Delfi 5.3 w32 2 cpu seems
scoring around 100 points higher than Delfi 5.3 w32.

best,

[Dr.Wael Deeb]

After first twenty games, Delfi 5.3 w32 2 cpu seems
scoring around 100 points higher than Delfi 5.3 w32.

best,

With all my respect I strongly suspect that doubling the speed will earn you that much,maybe 30-40,maximum 60 Elo,but 100 Elo is not possible