WebSVN – Games.Chess Giants – Diff – /engine-crafty/crafty.hlp

 evaluation..................... adjust evaluation terms.
 exit........................... restores STDIN to keyboard.
 force move..................... forces specific move.
 hash n......................... sets transposition table size.
                                  (n bytes, nK bytes or nM bytes).
-hashe n........................ sets eval hash table size.
 hashp n........................ sets pawn hash table size.
 history........................ display game moves.
 import filename................ imports learning data (.lrn files).
 info........................... displays program settings.
 input filename................. sets STDIN to filename, reverts back on exit.
                                  clear clears all learned information
 level moves time inc........... sets ICS time controls.
 linelength n................... sets line length to n.  A really large value
                                 will produce 1 line PVs, making parsing easier
 list........................... update/display GM/IM/computer lists.
+lmp base scale................. LMP pruning move counts
-lmr min max depths moves scale. LMR reduction matrix generator
+lmr min max bias moves scale... LMR reduction matrix generator
 load file title................ load a position from problem file, starting
                                 with line containing title, ending on exit.
 log on|off..................... turn logging on/off.
 mode normal|tournament......... toggles tournament mode.
 move........................... initiates search (same as go).
 skill n........................ set skill level to n
 smp............................ sets SMP parameters (help smp for details)
 sn n........................... sets absolute search node limit.
 speech on|off.................. enables (disables) audio output.
 st n........................... sets absolute search time.
-store val...................... stores position/score (position.bin).
 swindle on|off................. enables/disables swindle mode.
 tags........................... list PGN header tags.
 test file [N].................. test a suite of problems.
 time........................... time controls.
 timebook....................... out of book time adjustment
 list is:
 list SP +name [book=filename] [personality=filename]
 <end>
+<lmp>
+lmp base scale
+This commands tunes the LMP move count thresholds.  The array it produces
+is indexed by depth, and defines the number of moves at that remaining
+depth that must be searched before late move pruning can kick in.
+The basic formula looks like this:
+moves = base + depth ^ scale
+Bigger valuse for base and scale make LMP more conservative, smaller values
+make it more aggressive and risky.
 <lmr>
 lmr min max dscale mscale scale
 <end>
 <smp>
 smp commands are used to control the SMP search.
-smpaffinity <off|n> is used to enable or disable processor affinity.  "off"
+smpaffinity <n> <p> is used to enable or disable processor affinity.  "-1"
 disables affinity and lets threads run on any available core.  If you use an
 integer <n> then thread zero will bind itself to cpu <n> and each additional
 thread will bind to the next higher cpu number.  This is useful if you try to
 run two copies of crafty on the same machine, now you can cause one to bind
 to the first <n> cores, and the second to the last <n> cores.  For the first
 instance of Crafty, you would use smpaffinity=0, and for the second
 smpaffinity=8, assuming you are running 8 threads per copy on a 16 cpu machine.
 If you get this wrong, you can have more than one thread on the same cpu which
 will significantly impact performance.
+The second parameter is used to help Crafty identify physical vs logical cores.
+On a typical 20 core intel machine, processors 0 - 19 are on physical cores,
+then 20-39 map back to those same physical cores, but different logical
+(hyperthreaded) processors.  "1" is the correct value for this system.  For an
+IBM Power 8 machine with dual 10-core chips, processors 0 through 7 are on
+physical core 0, then 8 through 15 are on physical core 1, etc.  A value of "8"
+will map threads to physical cores correctly as each thread is spaced on the
+current processor core + 8, which is correct.
 smpmt <n> sets the total number of allowable threads for the search.  The
 default is one (1) as Crafty does not assume it should use all available
 resources.  For optimal performance this should be set to the number of
 physical cores your machine has, which does NOT include hyperthreaded cores.

Subversion Repositories Games.Chess Giants

Games.Chess Giants/engine-crafty/crafty.hlp – Rev 110 → 154