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YBWC: Active Reparenting
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Robert Hyatt



Joined: 27 Feb 2006
Posts: 15816
Location: Birmingham, AL
PostPost subject: Re: YBWC: Active Reparenting    Posted: Thu Apr 12, 2012 1:20 am Reply to topic Reply with quote
mcostalba wrote:
bob wrote:
There are a few ugly race conditions to handle as well. One runs out of work to do, finds an active split point, verifies there is something to do, and then does the usual "copy/work" stuff. But it then can split at a point that is no longer active, because between the time when you check to see if the split point is active and there is work to do, and you copy the necessary data to start the parallel search, one of the other processors already searching could have completed everything and cleaned up...


Obviously you didn't read the code. Thanks anyhow for your report on your past experiences. Actually I cannot say if it is good or bad until after the testing, but because I think this patch kicks in (bad or good) only with high number of cores I was asking for some test support.


Sure didn't. I was simply commenting on the idea itself, which is not new. DTS does that in Cray Blitz since it is simple. But I limited it because I would rather not have too many threads collect at one split point... BTW why wouldn't this "kick in" with even 4 cores???

I have seen as many as 100 active split points on a 12 core box in a 30 minute game. For 8 cores, the max was about the same, with a peak of 94 in the one log file I examined...

I don't have any significant 2/4 core games unfortunately, so I can't give data there, but with so many split points, there is plenty of opportunity to do an "out-of-band split" at an already active point...
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Subject Author Date/Time
YBWC: Active Reparenting Marco Costalba Tue Apr 10, 2012 5:38 pm
      Re: YBWC: Active Reparenting Vincent Diepeveen Tue Apr 10, 2012 6:23 pm
            Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 10, 2012 7:11 pm
                  Re: YBWC: Active Reparenting Vincent Diepeveen Tue Apr 10, 2012 7:54 pm
                        Re: YBWC: Active Reparenting Marco Costalba Tue Apr 10, 2012 8:48 pm
                              Re: YBWC: Active Reparenting Vincent Diepeveen Wed Apr 11, 2012 10:09 am
                                    Re: YBWC: Active Reparenting Robert Hyatt Mon Apr 16, 2012 6:53 pm
                        Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 10, 2012 11:11 pm
                              Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 10, 2012 11:33 pm
                              Re: YBWC: Active Reparenting Robert Hyatt Mon Apr 16, 2012 7:07 pm
                                    Re: YBWC: Active Reparenting Vincent Diepeveen Mon Apr 16, 2012 8:55 pm
                                          Re: YBWC: Active Reparenting Robert Hyatt Tue Apr 17, 2012 2:54 pm
                                                Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 17, 2012 5:42 pm
                                                      Re: YBWC: Active Reparenting Robert Hyatt Tue Apr 17, 2012 8:01 pm
                                                            Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 17, 2012 9:34 pm
                                                                  Re: YBWC: Active Reparenting Robert Hyatt Tue Apr 17, 2012 9:46 pm
                                                                        Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 17, 2012 10:30 pm
                                                                              Re: YBWC: Active Reparenting Vincent Diepeveen Tue Apr 17, 2012 11:43 pm
                                                                                    Re: YBWC: Active Reparenting Daniel Shawul Wed Apr 18, 2012 1:05 am
                                                                                          Re: YBWC: Active Reparenting Vincent Diepeveen Wed Apr 18, 2012 11:24 am
                                                                                          Re: YBWC: Active Reparenting Daniel Shawul Wed Apr 18, 2012 1:01 pm
                                                                              Re: YBWC: Active Reparenting Robert Hyatt Wed Apr 18, 2012 7:34 pm
                                                                                    Re: YBWC: Active Reparenting Daniel Shawul Wed Apr 18, 2012 11:18 pm
                                                                                          Re: YBWC: Active Reparenting Vincent Diepeveen Thu Apr 19, 2012 7:01 am
                                                                                          Re: YBWC: Active Reparenting Daniel Shawul Thu Apr 19, 2012 12:46 pm
                                                                                          Re: YBWC: Active Reparenting Vincent Diepeveen Thu Apr 19, 2012 2:40 pm
                                                                                          Re: YBWC: Active Reparenting Daniel Shawul Thu Apr 19, 2012 9:32 pm
                                                                                          Re: YBWC: Active Reparenting Robert Hyatt Thu Apr 19, 2012 7:08 pm
                                                                                          Re: YBWC: Active Reparenting Daniel Shawul Thu Apr 19, 2012 9:37 pm
                                                                                          Re: YBWC: Active Reparenting Robert Hyatt Thu Apr 19, 2012 9:48 pm
                                                                                          Re: YBWC: Active Reparenting Robert Hyatt Thu Apr 19, 2012 6:59 pm
                                                                                          Re: YBWC: Active Reparenting Robert Hyatt Thu Apr 19, 2012 5:30 pm
                                                                        Re: YBWC: Active Reparenting Vincent Diepeveen Tue Apr 17, 2012 11:29 pm
                                                                              Re: YBWC: Active Reparenting Daniel Shawul Wed Apr 18, 2012 12:58 am
                                                                  Re: YBWC: Active Reparenting Vincent Diepeveen Tue Apr 17, 2012 11:18 pm
                                    Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 17, 2012 5:37 pm
      Re: YBWC: Active Reparenting Álvaro Begué Tue Apr 10, 2012 6:27 pm
            Re: YBWC: Active Reparenting Vincent Diepeveen Tue Apr 10, 2012 6:44 pm
      Re: YBWC: Active Reparenting Robert Hyatt Tue Apr 10, 2012 9:39 pm
            Re: YBWC: Active Reparenting Marco Costalba Wed Apr 11, 2012 6:06 am
                  Re: YBWC: Active Reparenting Robert Hyatt Thu Apr 12, 2012 1:20 am
                        Re: YBWC: Active Reparenting Vincent Diepeveen Sun Apr 15, 2012 10:04 am
                              Re: YBWC: Active Reparenting Marco Costalba Sun Apr 15, 2012 10:22 am
                                    Re: YBWC: Active Reparenting Vincent Diepeveen Sun Apr 15, 2012 2:39 pm
                                          Re: YBWC: Active Reparenting Marco Costalba Mon Apr 16, 2012 5:29 am
                                                Re: YBWC: Active Reparenting Vincent Diepeveen Mon Apr 16, 2012 5:54 pm
                                                      Re: YBWC: Active Reparenting Marco Costalba Tue Apr 17, 2012 11:30 am
                                                Re: YBWC: Active Reparenting Marco Costalba Wed Apr 18, 2012 6:31 am
      Re: YBWC: Active Reparenting Rein Halbersma Wed Apr 11, 2012 7:23 am
            Re: YBWC: Active Reparenting Vincent Diepeveen Wed Apr 11, 2012 9:07 am
            Re: YBWC: Active Reparenting Vincent Diepeveen Wed Apr 11, 2012 9:31 am
            Re: YBWC: Active Reparenting Daniel Shawul Wed Apr 11, 2012 12:14 pm
                  Re: YBWC: Active Reparenting Vincent Diepeveen Wed Apr 11, 2012 1:54 pm
                  Re: YBWC: Active Reparenting Robert Hyatt Thu Apr 12, 2012 1:28 am
                        Re: YBWC: Active Reparenting Daniel Shawul Tue Apr 17, 2012 5:49 pm
                              Re: YBWC: Active Reparenting Vincent Diepeveen Tue Apr 17, 2012 11:10 pm
                                    Re: YBWC: Active Reparenting Daniel Shawul Wed Apr 18, 2012 12:50 am
                              Re: YBWC: Active Reparenting Robert Hyatt Wed Apr 18, 2012 7:38 pm
                                    Re: YBWC: Active Reparenting Daniel Shawul Wed Apr 18, 2012 11:30 pm
                                          Re: YBWC: Active Reparenting Vincent Diepeveen Thu Apr 19, 2012 7:08 am
                                                Re: YBWC: Active Reparenting Daniel Shawul Thu Apr 19, 2012 12:15 pm
                                                      Re: YBWC: Active Reparenting Vincent Diepeveen Thu Apr 19, 2012 1:53 pm
                                          Re: YBWC: Active Reparenting Robert Hyatt Thu Apr 19, 2012 7:11 pm
      Re: GPUs Srdja Matovic Mon Jun 04, 2012 5:08 pm
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