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https://github.com/sockspls/badfish
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5be3d98d17
Currently minimum split depth is set automatically to 6 when number of CPUs is more than 4. I believe this is a bad idea since for example my quad (4CPU with hyperthreading) is detected as 8CPU computer. I've manually lowered down the number of Threads, but so far I have played all games with Minimum Split Depth set to 6! Since 4CPU computers with hyperthreading are quite common and 8 CPU computers extremely rear (I expect we can get a direct jump to 16 or 32 cores), this automatic adjusting is likely to do more harm than good. Add a note in Readme.txt, so that those rear 8CPU owners can manually tweak the "Minimum Split Depth" parameter Signed-off-by: Marco Costalba <mcostalba@gmail.com>
91 lines
3.5 KiB
Text
91 lines
3.5 KiB
Text
1. Introduction
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---------------
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Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is
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not a complete chess program, but requires some UCI compatible GUI
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(like XBoard with PolyGlot, eboard, Jos<6F>, Arena, Sigma Chess, Shredder,
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Chess Partner, or Fritz) in order to be used comfortably. Read the
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documentation for your GUI of choice for information about how to use
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Stockfish with your GUI.
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This version of Stockfish supports up to 8 CPUs, but has not been
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tested thoroughly with more than 2. The program tries to detect the
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number of CPUs on your computer and set the number of search threads
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accordingly, but please be aware that the detection is not always
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correct. It is therefore recommended to inspect the value of the
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"Threads" UCI parameter, and to make sure it equals the number of CPU
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cores on your computer. If you are using more than four threads, it
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is recommended to raise the value of "Minimum Split Depth" UCI parameter
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to 6.
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2. Files
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--------
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This distribution of Stockfish consists of the following files:
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* Readme.txt, the file you are currently reading.
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* Copying.txt, a text file containing the GNU General Public
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License.
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* src/, a subdirectory containing the full source code, including a
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Makefile that can be used to compile Stockfish on Unix-like
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systems. For further information about how to compile Stockfish
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yourself, read section 4 below.
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* polyglot.ini, for using Stockfish with Fabien Letouzey's PolyGlot
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adapter.
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3. Opening books
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----------------
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This version of Stockfish has experimental support for PolyGlot opening
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books. For information about how to create such books, consult the
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PolyGlot documentation. The book file can be selected by setting the
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UCI parameter "Book File".
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4. Compiling it yourself
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------------------------
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On Unix-like systems, it should usually be possible to compile
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Stockfish directly from the source code with the included Makefile.
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The exception is computer with big-endian CPUs, like PowerPC
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Macintoshes. Some of the bitboard routines in the current version of
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Stockfish are endianness-sensitive, and won't work on a big-endian CPU.
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Stockfish has POPCNT instruction runtime detection and support. This can
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give an extra speed on Core i7 or similar systems. To enable this feature
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(disabled by default) simply uncomment #define USE_POPCNT in bitcount.h
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before to compile.
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On 64 bit Unix-like systems the 'bsfq' assembly instruction will be used
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for bit counting. Detection is automatic at compile time, but in case you
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experience compile problems you can comment out #define USE_BSFQ line in types.h
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5. Terms of use
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---------------
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Stockfish is free, and distributed under the GNU General Public License
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(GPL). Essentially, this means that you are free to do almost exactly
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what you want with the program, including distributing it among your
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friends, making it available for download from your web site, selling
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it (either by itself or as part of some bigger software package), or
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using it as the starting point for a software project of your own.
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The only real limitation is that whenever you distribute Stockfish in
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some way, you must always include the full source code, or a pointer
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to where the source code can be found. If you make any changes to the
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source code, these changes must also be made available under the GPL.
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For full details, read the copy of the GPL found in the file named
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Copying.txt.
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6. Feedback
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-----------
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The author's e-mail address is mcostalba@gmail.com
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