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C# Performance
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Sven Schüle



Joined: 15 May 2008
Posts: 2246
Location: Berlin, Germany
PostPost subject: Re: C# Performance    Posted: Sun Feb 05, 2012 12:51 am Reply to topic Reply with quote
RoadWarrior wrote:
Sven Schüle wrote:

Just to be sure: did this change as I described it above cause 2% slowdown, or 2% speedup? I could not imagine how avoiding to test E8 (resp. E1) for attacks twice can slow down your engine. If it does indeed, then how did you implement it?


I added IsInCheck before generating any moves. That appears to have cost more time than it saved in avoiding the generation of castling moves. Mind you, I haven't profiled it yet, but those are the only 2 changes I made.

Well, it is clear that calling IsInCheck at every node costs much more than avoiding castling generation, since there are several reasons why castling can be not available that are cheaper to test than testing attacks to the king. But that is not a fair comparison ...

My proposal was meant as:
a) IF you already have the IsInCheck prior to move generation then there is no need to test for attacks to E8 (E1) in castling move generation, just test the inCheck flag, and
b) if you don't have IsInCheck and you don't want to use that information in the move generator then you can still save time by not testing attacks to E8 (E1) twice, for two castle types per color. You might need an additional flag like "attacksToE8WereTested" in the castling generation function to achieve that.

Since in fact you did not have IsInCheck before, the only change where you can compare speed is b).

For perft you do not strictly need IsInCheck, depending on your legality checking strategy of course. But for real search you will very likely need it anyway. I see perft as a tool to validate (or debug) the "real" move generator that will be part of your searching engine, so I would build the move generator exactly in the way it is meant to work in the real engine (including information that was collected in advance), and then base "perft" on that. The "perft" validation shall still work the same way when you have your search up and running, in my opinion the target is not to make "perft" as fast as it can be, or you lose the ability to test any later changes to board representation, make/unmake, or move generator by running "perft".

Sven
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Subject Author Date/Time
C# Performance Richard Allbert Fri Jan 27, 2012 8:41 pm
      Re: C# Performance Kevin Hearn Fri Jan 27, 2012 9:01 pm
            Re: C# Performance Richard Allbert Fri Jan 27, 2012 9:13 pm
      Re: C# Performance Gary Fri Jan 27, 2012 9:07 pm
            Re: C# Performance Richard Allbert Fri Jan 27, 2012 9:17 pm
                  Re: C# Performance Gary Fri Jan 27, 2012 10:09 pm
      Re: C# Performance Mark Pearce Sat Jan 28, 2012 12:59 am
            Re: C# Performance Richard Allbert Sat Jan 28, 2012 8:44 am
                  Re: C# Performance Sven Schüle Sat Jan 28, 2012 9:48 am
                        Re: C# Performance Richard Allbert Sat Jan 28, 2012 10:25 am
                              Re: C# Performance Richard Allbert Sat Jan 28, 2012 11:41 am
                  Re: C# Performance Mark Pearce Sat Jan 28, 2012 11:44 am
            Re: C# Performance Richard Allbert Sat Jan 28, 2012 10:31 am
      Re: C# Performance Marco Costalba Sat Jan 28, 2012 1:09 pm
            Re: C# Performance Lucas Braesch Sat Jan 28, 2012 1:52 pm
            Re: C# Performance Richard Allbert Sat Jan 28, 2012 2:05 pm
                  Re: C# Performance Marco Costalba Sat Jan 28, 2012 2:30 pm
                        Re: C# Performance Richard Allbert Sat Jan 28, 2012 5:22 pm
                              Re: C# Performance Sven Schüle Sat Jan 28, 2012 6:02 pm
                                    Re: C# Performance Richard Allbert Sat Jan 28, 2012 6:12 pm
                                    Re: C# Performance Robert Purves Sat Jan 28, 2012 10:17 pm
                              Re: C# Performance Marco Costalba Sat Jan 28, 2012 10:25 pm
                  Re: C# Performance Thomas Petzke Sat Jan 28, 2012 4:21 pm
      Re: C# Performance Richard Allbert Mon Jan 30, 2012 12:52 pm
            Re: C# Performance Marco Costalba Mon Jan 30, 2012 6:37 pm
                  Re: C# Performance Richard Allbert Wed Feb 01, 2012 6:55 pm
                        Re: C# Performance Marco Costalba Wed Feb 01, 2012 7:18 pm
            Re: C# Performance Mark Pearce Mon Jan 30, 2012 9:55 pm
                  Re: C# Performance Richard Allbert Wed Feb 01, 2012 6:57 pm
                        Re: C# Performance Mark Pearce Wed Feb 01, 2012 9:59 pm
            Re: C# Performance Mark Pearce Fri Feb 03, 2012 1:34 am
                  Re: C# Performance Robert Purves Fri Feb 03, 2012 3:26 am
                        Re: C# Performance Mark Pearce Fri Feb 03, 2012 9:28 am
                              Re: C# Performance Sven Schüle Fri Feb 03, 2012 9:45 am
                                    Re: C# Performance Mark Pearce Sat Feb 04, 2012 7:57 pm
                                          Re: C# Performance Sven Schüle Sat Feb 04, 2012 10:36 pm
                                                Re: C# Performance Mark Pearce Sat Feb 04, 2012 11:49 pm
                                                      Re: C# Performance Sven Schüle Sun Feb 05, 2012 12:51 am
                                                            Re: C# Performance Mark Pearce Sun Feb 05, 2012 1:05 am
                              Re: C# Performance Sven Schüle Fri Feb 03, 2012 10:04 am
                                    Re: C# Performance Mark Pearce Fri Feb 03, 2012 11:40 am
                                          Re: C# Performance Richard Allbert Sat Feb 04, 2012 7:10 pm
                                                Re: C# Performance Lucas Braesch Sat Feb 04, 2012 8:31 pm
                                                      Re: C# Performance Mark Pearce Sat Feb 04, 2012 10:23 pm
                                                            Re: C# Performance Mark Pearce Sun Feb 05, 2012 12:23 am
                                                                  Re: C# Performance Lucas Braesch Sun Feb 05, 2012 2:57 am
                                                                        Re: C# Performance Mark Pearce Sun Feb 05, 2012 11:40 am
                                                                              Re: C# Performance Richard Allbert Mon Feb 06, 2012 6:29 pm
                                                                                    Re: C# Performance Richard Allbert Mon Feb 06, 2012 6:29 pm
                                                                                          Re: C# Performance Richard Allbert Mon Feb 06, 2012 6:30 pm
                                                                                          Re: C# Performance Richard Allbert Mon Feb 06, 2012 6:45 pm
                                                                                          Re: C# Performance Gary Mon Feb 06, 2012 7:00 pm
                                                                                          Re: C# Performance Richard Allbert Mon Feb 06, 2012 7:12 pm
                                                                                          Re: C# Performance Sven Schüle Mon Feb 06, 2012 10:50 pm
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 9:52 am
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 9:53 am
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 9:53 am
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 9:54 am
                                                                                          Re: C# Performance Mark Pearce Tue Feb 07, 2012 1:59 pm
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 2:54 pm
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 3:06 pm
                                                                                          Re: C# Performance Mark Pearce Tue Feb 07, 2012 5:17 pm
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 6:10 pm
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 6:20 pm
                                                                                          Re: C# Performance Mark Pearce Tue Feb 07, 2012 8:02 pm
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 9:19 pm
                                                                                          Re: C# Performance Mark Pearce Tue Feb 07, 2012 10:20 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 7:47 am
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 7:57 am
                                                                                          Re: C# Performance Sven Schüle Wed Feb 08, 2012 10:09 am
                                                                                          Re: C# Performance Mark Pearce Wed Feb 08, 2012 12:16 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sat Feb 18, 2012 10:03 pm
                                                                                          Re: C# Performance Mark Pearce Wed Feb 08, 2012 9:30 am
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 12:02 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 12:34 pm
                                                                                          Re: C# Performance Mark Pearce Wed Feb 08, 2012 12:56 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 1:18 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 2:30 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 2:34 pm
                                                                                          Re: C# Performance Mark Pearce Wed Feb 08, 2012 3:02 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 3:27 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 3:29 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 3:59 pm
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 4:04 pm
                                                                                          Re: C# Performance Mark Pearce Wed Feb 08, 2012 6:07 pm
                                                                                          Re: C# Performance Richard Allbert Thu Feb 09, 2012 10:41 am
                                                                                          Re: C# Performance Mark Pearce Thu Feb 09, 2012 1:47 pm
                                                                                          Re: C# Performance Richard Allbert Thu Feb 09, 2012 2:56 pm
                                                                                          Re: C# Performance Mark Pearce Sat Feb 11, 2012 4:41 pm
                                                                                          Re: C# Performance Richard Allbert Sun Feb 12, 2012 8:34 am
                                                                                          Re: C# Performance Lucas Braesch Sun Feb 12, 2012 10:52 am
                                                                                          Re: C# Performance Richard Allbert Sun Feb 12, 2012 12:26 pm
                                                                                          Re: C# Performance Ron Murawski Mon Feb 13, 2012 5:26 am
                                                                                          Re: C# Performance Lucas Braesch Mon Feb 13, 2012 5:52 am
                                                                                          Re: C# Performance Richard Allbert Mon Feb 13, 2012 6:27 am
                                                                                          Re: C# Performance Ron Murawski Tue Feb 14, 2012 6:38 am
                                                                                          Re: C# Performance Lucas Braesch Tue Feb 14, 2012 8:22 am
                                                                                          Re: C# Performance Mark Pearce Tue Feb 14, 2012 11:30 pm
                                                                                          Re: C# Performance Richard Allbert Thu Feb 16, 2012 10:49 am
                                                                                          Re: C# Performance Mark Pearce Sat Feb 18, 2012 12:34 pm
                                                                                          Re: C# Performance Richard Allbert Mon Feb 20, 2012 9:19 pm
                                                                                          Re: C# Performance Mark Pearce Tue Feb 21, 2012 8:33 am
                                                                                          Re: C# Performance Richard Allbert Tue Feb 21, 2012 6:37 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sat Feb 18, 2012 10:19 pm
                                                                                          Re: C# Performance Mark Pearce Sun Feb 12, 2012 2:01 pm
                                                                                          Re: C# Performance Richard Allbert Sun Feb 12, 2012 4:40 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sat Feb 18, 2012 10:06 pm
                                                                                          Re: C# Performance Mark Pearce Sun Feb 19, 2012 1:01 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sun Feb 19, 2012 5:25 pm
                                                                                          Re: C# Performance Mark Pearce Sun Feb 19, 2012 7:04 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sun Feb 19, 2012 9:17 pm
                                                                                          Re: C# Performance Mark Pearce Sun Feb 19, 2012 11:33 pm
                                                                                          Re: C# Performance Richard Allbert Sun Feb 19, 2012 9:22 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sun Feb 19, 2012 9:32 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sun Feb 19, 2012 9:37 pm
                                                                                          Re: C# Performance Vincent Diepeveen Sun Feb 19, 2012 10:06 pm
                                                                                          Re: C# Performance Lucas Braesch Wed Feb 08, 2012 10:56 am
                                                                                          Re: C# Performance Mark Pearce Wed Feb 08, 2012 11:30 am
                                                                                          Re: C# Performance Richard Allbert Wed Feb 08, 2012 12:04 pm
                                                                                          Re: C# Performance Tony Soares Tue Feb 07, 2012 3:47 am
                                                                                          Re: C# Performance Richard Allbert Tue Feb 07, 2012 9:55 am
                                          Re: C# Performance Mark Pearce Sat Feb 04, 2012 8:37 pm
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