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Some Notes about Hyper-Threading
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Robert Hyatt



Joined: 27 Feb 2006
Posts: 15816
Location: Birmingham, AL
PostPost subject: Re: Some Notes about Hyper-Threading    Posted: Sun Dec 11, 2011 3:49 pm Reply to topic Reply with quote
rodolfoleoni wrote:
bob wrote:
rodolfoleoni wrote:
bob wrote:

Problem with HT on is that if you have 4 physical cores, and search X NPS, when you go to 8 cores (HT on) the tree will grow by 30%. If your NPS doesn't grow by MORE than 30%, you see a net loss.

NPS is NOT the way to measure parallel search performance. It provides completely bogus comparisons...


And here's my problem: I tried to disable HT but I didn't find any option in BIOS-Advanced. There's only an utility, "Easy Flash", and I should only use it to browse and find the BIOS file.... but I've no idea about where to search for it.

It's an Asus laptop, X53S series. Any guess?

Thanks in advance. Smile


It is usually under 'CPU information." But it is often called something bizarre like "logical processor on/off" or such nonsense. That is what our Dell boxes had the last time I fooled with this. I no longer disable HT, I just make sure to use 1 thread per physical core and let the O/S (Linux in my case) make certain that each physical thread runs on its own physical core...


Thanks! Smile

As soon as the current test I'm running will be complete I'll try to disable HT again.

BTW, Crafty 23.4 is one of the sparring partners I always use to tune The Baron. Crafty seems to gain something in depth with HT enabled and 8 cores (ponder off), but I want to try it with 4 cores and HT disabled too. I think it'll run better.


I have not found a box where HT on helps crafty. Might help on some positions, but it hurts on others, and the overall effect is a loss, although not a big one.
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Subject Author Date/Time
Some Notes about Hyper-Threading Sedat Canbaz Fri Dec 09, 2011 3:50 pm
      Re: Some Notes about Hyper-Threading Ernest Bonnem Sat Dec 10, 2011 12:31 am
            Re: Some Notes about Hyper-Threading Sedat Canbaz Sat Dec 10, 2011 2:43 am
                  Re: Some Notes about Hyper-Threading Robert Hyatt Sat Dec 10, 2011 4:06 pm
                        Re: Some Notes about Hyper-Threading enrico fagiuoli Sat Dec 10, 2011 11:26 pm
                        Re: Some Notes about Hyper-Threading Ernest Bonnem Mon Dec 12, 2011 8:07 pm
                        Re: Some Notes about Hyper-Threading H.G.Muller Tue Jun 26, 2012 4:30 pm
                              Re: Some Notes about Hyper-Threading Daniel Shawul Tue Jun 26, 2012 11:35 pm
                                    Re: Some Notes about Hyper-Threading H.G.Muller Wed Jun 27, 2012 5:40 am
                                          Re: Some Notes about Hyper-Threading Daniel Shawul Wed Jun 27, 2012 10:23 am
                                                Re: Some Notes about Hyper-Threading H.G.Muller Wed Jun 27, 2012 10:57 am
                                                      Re: Some Notes about Hyper-Threading Daniel Shawul Wed Jun 27, 2012 11:33 am
                  Re: Some Notes about Hyper-Threading Ernest Bonnem Sun Dec 11, 2011 1:19 am
                        Re: Some Notes about Hyper-Threading M ANSARI Sun Dec 11, 2011 6:06 am
                              Re: Some Notes about Hyper-Threading Sedat Canbaz Mon Dec 12, 2011 11:14 am
                        Re: Some Notes about Hyper-Threading Sedat Canbaz Sun Dec 11, 2011 8:31 am
                              Re: Some Notes about Hyper-Threading Ernest Bonnem Sun Dec 11, 2011 6:00 pm
                                    Re: Some Notes about Hyper-Threading Vincent Diepeveen Sun Dec 11, 2011 7:12 pm
                                          Re: Some Notes about Hyper-Threading Vincent Diepeveen Sun Dec 11, 2011 7:35 pm
                                                Re: Some Notes about Hyper-Threading Sedat Canbaz Mon Dec 12, 2011 2:03 am
                                                      Re: Some Notes about Hyper-Threading Vincent Lejeune Mon Dec 12, 2011 8:46 am
                                                            Re: Some Notes about Hyper-Threading Sedat Canbaz Mon Dec 12, 2011 12:04 pm
                                                                  Re: Some Notes about Hyper-Threading Vincent Lejeune Mon Dec 12, 2011 12:32 pm
                                    Re: Some Notes about Hyper-Threading Sedat Canbaz Mon Dec 12, 2011 2:37 am
                                          Re: Some Notes about Hyper-Threading Ernest Bonnem Mon Dec 12, 2011 5:24 pm
                                                Re: Some Notes about Hyper-Threading Sedat Canbaz Mon Dec 12, 2011 6:14 pm
                                                      Re: Some Notes about Hyper-Threading Robert Hyatt Mon Dec 12, 2011 6:51 pm
                                                            Re: Some Notes about Hyper-Threading Sedat Canbaz Mon Dec 12, 2011 7:27 pm
                                                                  Re: Some Notes about Hyper-Threading Robert Hyatt Tue Dec 13, 2011 5:01 pm
                                                      Re: Some Notes about Hyper-Threading Vincent Lejeune Tue Dec 13, 2011 2:10 am
                                                            Re: Some Notes about Hyper-Threading Sedat Canbaz Tue Dec 13, 2011 8:35 am
                                                            Re: Some Notes about Hyper-Threading Sujay Jagannathan Wed Jun 27, 2012 12:42 pm
                                                      Re: Some Notes about Hyper-Threading Vincent Lejeune Tue Jun 26, 2012 4:00 pm
                                                            Re: Some Notes about Hyper-Threading Sedat Canbaz Tue Jun 26, 2012 4:56 pm
                                                                  Re: Some Notes about Hyper-Threading Vincent Lejeune Wed Jun 27, 2012 7:45 am
                                                                  Re: Some Notes about Hyper-Threading Vincent Lejeune Wed Jun 27, 2012 10:22 pm
                                                Re: Some Notes about Hyper-Threading Sedat Canbaz Mon Dec 12, 2011 7:51 pm
      Re: Some Notes about Hyper-Threading Rodolfo Leoni Sat Dec 10, 2011 10:45 am
            Re: Some Notes about Hyper-Threading Sedat Canbaz Sat Dec 10, 2011 12:25 pm
                  Re: Some Notes about Hyper-Threading Albert Silver Sat Dec 10, 2011 12:33 pm
                        Re: Some Notes about Hyper-Threading Vincent Diepeveen Sat Dec 10, 2011 7:52 pm
                              Re: Some Notes about Hyper-Threading Sedat Canbaz Sat Dec 10, 2011 10:23 pm
                                    Re: Some Notes about Hyper-Threading Russell Murray Sat Dec 10, 2011 11:58 pm
                                          Re: Some Notes about Hyper-Threading Wylie Garvin Sun Dec 11, 2011 12:23 am
                                                Re: Some Notes about Hyper-Threading Robert Hyatt Sun Dec 11, 2011 12:38 am
                                    Re: Some Notes about Hyper-Threading Vincent Diepeveen Sun Dec 11, 2011 4:25 pm
                  Re: Some Notes about Hyper-Threading Robert Hyatt Sat Dec 10, 2011 4:04 pm
                        Re: Some Notes about Hyper-Threading Rodolfo Leoni Sat Dec 10, 2011 8:53 pm
                              Re: Some Notes about Hyper-Threading Robert Hyatt Sun Dec 11, 2011 12:36 am
                                    Re: Some Notes about Hyper-Threading Rodolfo Leoni Sun Dec 11, 2011 2:19 pm
                                          Re: Some Notes about Hyper-Threading Robert Hyatt Sun Dec 11, 2011 3:49 pm
                                    Re: Some Notes about Hyper-Threading Sujay Jagannathan Wed Jun 27, 2012 12:36 pm
                              Re: Some Notes about Hyper-Threading Robert Flesher Sun Dec 11, 2011 7:00 pm
                                    Re: Some Notes about Hyper-Threading Vincent Diepeveen Sun Dec 11, 2011 7:27 pm
                              Re: Some Notes about Hyper-Threading Lonnie Cook Wed Jun 27, 2012 12:44 pm
                        Re: Some Notes about Hyper-Threading Carl Bicknell Mon Dec 12, 2011 9:06 am
                              Re: Some Notes about Hyper-Threading Robert Hyatt Mon Dec 12, 2011 1:31 pm
                                    Re: Some Notes about Hyper-Threading Carl Bicknell Mon Dec 12, 2011 4:00 pm
                                          Re: Some Notes about Hyper-Threading Robert Hyatt Mon Dec 12, 2011 4:31 pm
                                                Re: Some Notes about Hyper-Threading Carl Bicknell Mon Dec 12, 2011 4:54 pm
                                                      Re: Some Notes about Hyper-Threading Robert Hyatt Mon Dec 12, 2011 6:42 pm
                                                            Re: Some Notes about Hyper-Threading Robert Flesher Tue Dec 13, 2011 4:25 am
                                    Re: Some Notes about Hyper-Threading Vincent Diepeveen Tue Dec 13, 2011 6:46 pm
                                          Re: Some Notes about Hyper-Threading Robert Hyatt Wed Dec 14, 2011 4:30 am
                                                Re: Some Notes about Hyper-Threading Sedat Canbaz Wed Dec 14, 2011 1:01 pm
                                                      Re: Some Notes about Hyper-Threading Robert Hyatt Wed Dec 14, 2011 7:35 pm
                                                            Re: Some Notes about Hyper-Threading Sedat Canbaz Wed Dec 14, 2011 8:22 pm
                                                      Re: Some Notes about Hyper-Threading Sedat Canbaz Wed Dec 14, 2011 7:39 pm
                                                            Re: Some Notes about Hyper-Threading Robert Hyatt Wed Dec 14, 2011 10:43 pm
                                                                  Re: Some Notes about Hyper-Threading Sedat Canbaz Thu Dec 15, 2011 2:21 am
                                                                        Re: Some Notes about Hyper-Threading Robert Hyatt Fri Dec 16, 2011 5:31 pm
                                                                              Re: Some Notes about Hyper-Threading Sedat Canbaz Fri Dec 16, 2011 6:55 pm
                                                                                    Re: Some Notes about Hyper-Threading Robert Hyatt Sat Dec 17, 2011 3:52 pm
                                                                  Re: Some Notes about Hyper-Threading Sedat Canbaz Thu Dec 15, 2011 2:34 am
                                                                        Re: Some Notes about Hyper-Threading Sedat Canbaz Thu Dec 15, 2011 3:13 am
                                                                              Re: Some Notes about Hyper-Threading Sedat Canbaz Fri Dec 16, 2011 11:27 am
                                                                                    Re: Some Notes about Hyper-Threading Sedat Canbaz Fri Dec 16, 2011 12:19 pm
                                                                                    Re: Some Notes about Hyper-Threading Robert Hyatt Fri Dec 16, 2011 11:25 pm
                                                                                          Re: Some Notes about Hyper-Threading Sedat Canbaz Sat Dec 17, 2011 12:26 am
                                                                                          Re: Some Notes about Hyper-Threading Sedat Canbaz Sat Dec 17, 2011 1:27 am
                                                                                          Re: Some Notes about Hyper-Threading Robert Hyatt Sat Dec 17, 2011 4:50 am
                                                                                          Re: Some Notes about Hyper-Threading Robert Hyatt Sat Dec 17, 2011 4:49 am
                                                                                          Re: Some Notes about Hyper-Threading Sedat Canbaz Sat Dec 17, 2011 10:11 am
                                                                                          Re: Some Notes about Hyper-Threading Robert Hyatt Sat Dec 17, 2011 3:54 pm
                                                                              Re: Some Notes about Hyper-Threading Robert Hyatt Fri Dec 16, 2011 11:23 pm
                                                                                    Re: Some Notes about Hyper-Threading Sedat Canbaz Sat Dec 17, 2011 12:09 am
                                                                                          Re: Some Notes about Hyper-Threading Robert Hyatt Sat Dec 17, 2011 4:52 am
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