Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)

By: Tim McCaffrey (timcaffrey.delete@this.aol.com), July 9, 2015 10:41 am
Room: Moderated Discussions
Maynard Handley (name99.delete@this.name99.org) on July 9, 2015 10:04 am wrote:

> There's a time for prognostication about who will do well in future,
> the consequences of business decisions, even cheering on your team.
> There is ALSO a time for trying to understand the algorithms that are
> present in a particular chip. This is one of those latter times.
> We still, for example, have no idea about the nature and quality of the prefetchers in either
> the A8 or Haswell/Broadwell; and if I figure out a way to shed light on that, and if that
> involves normalizing by frequency, that's how I will proceed, and I don't think that's something
> I have to apologize for. The goal is to understand the relevant chips.
>

You should also understand the divisor you are using is probably wrong. If you are
using single-core results, the processor was *probably* going much faster for the
Intel results (and maybe the Apple results as well). I did a comparison of Cinebench
results awhile back and I assumed, since it was a single threaded test, that all
processors were running at full turbo. The IPC results per processor family were
very consistent (which implies I was correct about the turbo).

The best way to compare these results is to lock down the clock speed, it would
also help if you could compare systems that were identical in all aspects
(cache size, etc) but only varied in clock speed. You could then tell if
scaling the scores by clock speed is valid or not.


< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Cyclone Macro-op fusionMaynard Handley2015/07/05 06:01 PM
  Cyclone Macro-op fusionGabriele Svelto2015/07/06 02:11 AM
    Cyclone Macro-op fusionMaynard Handley2015/07/06 10:25 AM
      Cyclone Macro-op fusionWilco2015/07/06 11:17 AM
        Cyclone Macro-op fusionMaynard Handley2015/07/06 12:07 PM
          Cyclone Macro-op fusionMaynard Handley2015/07/06 12:55 PM
            Cyclone Macro-op fusionGabriele Svelto2015/07/07 02:49 AM
      Power8 branch conversionSHK2015/07/06 12:41 PM
        Power8 branch conversionMaynard Handley2015/07/06 01:01 PM
          Power8 branch conversionMaynard Handley2015/07/06 01:09 PM
        Benefit of dynamic hammock predicationPaul A. Clayton2015/07/06 03:02 PM
          Benefit of dynamic hammock predicationMaynard Handley2015/07/06 03:34 PM
            Benefit of dynamic hammock predicationEduardoS2015/07/06 07:56 PM
            Benefit of dynamic hammock predicationPatrick Chase2015/07/06 10:30 PM
          Benefit of dynamic hammock predicationLinus Torvalds2015/07/06 03:59 PM
            Benefit of dynamic hammock predicationWilco2015/07/06 04:35 PM
              Benefit of dynamic hammock predicationLinus Torvalds2015/07/06 05:25 PM
                Benefit of dynamic hammock predicationanon2015/07/06 09:02 PM
            Benefit of dynamic hammock predicationPatrick Chase2015/07/06 10:31 PM
              Benefit of dynamic hammock predicationanon2015/07/06 11:02 PM
              Benefit of dynamic hammock predicationMichael S2015/07/07 01:07 AM
              Benefit of dynamic hammock predicationLinus Torvalds2015/07/07 09:23 AM
                Benefit of dynamic hammock predicationPatrick Chase2015/07/07 10:49 AM
                  Benefit of dynamic hammock predicationSHK2015/07/07 11:34 AM
                  Benefit of dynamic hammock predicationMaynard Handley2015/07/07 12:00 PM
                    Benefit of dynamic hammock predicationExophase2015/07/07 01:26 PM
                      Benefit of dynamic hammock predicationWilco2015/07/07 04:54 PM
                      Benefit of dynamic hammock predicationMaynard Handley2015/07/07 05:25 PM
                    Benefit of dynamic hammock predicationPatrick Chase2015/07/07 02:32 PM
                    Benefit of dynamic hammock predicationMichael S2015/07/08 01:57 AM
                  Benefit of dynamic hammock predicationSylvain Collange2015/07/08 06:30 AM
                    Benefit of dynamic hammock predicationMaynard Handley2015/07/08 09:46 AM
                      Benefit of dynamic hammock predicationSylvain Collange2015/07/08 10:32 AM
                        Benefit of dynamic hammock predicationMaynard Handley2015/07/08 10:57 AM
                        Sadly, skewed associativity has not been broadly adoptedPaul A. Clayton2015/07/08 02:00 PM
                        Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Maynard Handley2015/07/08 08:23 PM
                          Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)David Kanter2015/07/09 07:20 AM
                            Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Maynard Handley2015/07/09 10:04 AM
                              Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Tim McCaffrey2015/07/09 10:41 AM
                                Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Patrick Chase2015/07/09 01:08 PM
                                  Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Sylvain Collange2015/07/10 02:03 AM
                              Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)David Kanter2015/07/09 04:15 PM
                                Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Maynard Handley2015/07/09 05:21 PM
                            Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Patrick Chase2015/07/09 12:44 PM
                          Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)Patrick Chase2015/07/09 09:43 AM
                          Prediction quality of A8 and Intel (was Benefit of dynamic hammock predication)someone2015/07/10 05:43 AM
            Benefit of dynamic hammock predicationKonrad Schwarz2015/07/07 07:54 AM
            Benefit of dynamic hammock predicationdmcq2015/07/07 02:38 PM
              Benefit of dynamic hammock predicationLinus Torvalds2015/07/08 08:23 AM
                Benefit of dynamic hammock predicationdmcq2015/07/08 10:11 AM
                  Benefit of dynamic hammock predicationLinus Torvalds2015/07/08 01:38 PM
                    Example of memory ordering causing excitement in the real worldMark Roulo2015/07/08 04:54 PM
                      Example of memory ordering causing excitement in the real worlddmcq2015/07/09 04:37 AM
                        Example of memory ordering causing excitement in the real worldMark Roulo2015/07/09 08:24 AM
                          Example of memory ordering causing excitement in the real worlddmcq2015/07/09 10:09 AM
                          Example of memory ordering causing excitement in the real worldMaynard Handley2015/07/09 10:12 AM
                            Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/09 12:14 PM
                              Example of memory ordering causing excitement in the real worlddmcq2015/07/09 04:24 PM
                                Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/10 01:07 PM
                                  Example of memory ordering causing excitement in the real worlddmcq2015/07/10 03:49 PM
                                    Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/12 01:02 PM
                                      Example of memory ordering causing excitement in the real worlddmcq2015/07/13 05:03 AM
                                        Example of memory ordering causing excitement in the real worldMichael S2015/07/13 05:19 AM
                                        Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/14 01:21 PM
                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/14 02:54 PM
                                            Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/15 01:13 PM
                                              Example of memory ordering causing excitement in the real worlddmcq2015/07/15 03:43 PM
                                                Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/16 12:41 PM
                                                  Example of memory ordering causing excitement in the real worldWilco2015/07/17 01:57 PM
                                                    Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/17 04:29 PM
                                                      Example of memory ordering causing excitement in the real worlddmcq2015/07/18 04:07 AM
                                          Example of memory ordering causing excitement in the real worldJouni Osmala2015/07/16 03:52 AM
                                            Example of memory ordering causing excitement in the real worldSimon Farnsworth2015/07/16 01:05 PM
                                              Example of memory ordering causing excitement in the real worldJouni Osmala2015/07/17 01:18 AM
                                                ISA support for bound checkingMichael S2015/07/17 04:51 AM
                                                  ISA support for bound checkingEtienne2015/07/17 06:39 AM
                                                  MPX on SkylakeMark Roulo2015/07/17 08:19 AM
                                                    MPX on SkylakeMichael S2015/07/17 08:44 AM
                                                      MPX on SkylakeMark Roulo2015/07/17 09:03 AM
                                  Example of memory ordering causing excitement in the real worldanon2015/07/12 03:42 AM
                                    Example of memory ordering causing excitement in the real worlddmcq2015/07/12 10:27 AM
                                    Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/12 11:24 AM
                                      Example of memory ordering causing excitement in the real worldEduardoS2015/07/12 11:53 AM
                                        Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/12 01:07 PM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/12 07:52 PM
                                            Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/13 11:05 AM
                                              Example of memory ordering causing excitement in the real worlddmcq2015/07/13 12:20 PM
                                                Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/13 01:46 PM
                                                  Example of memory ordering causing excitement in the real worldMaynard Handley2015/07/13 02:10 PM
                                                    Example of memory ordering causing excitement in the real worldanon2015/07/13 08:51 PM
                                                    Simple cores justifying weak ordering?Paul A. Clayton2015/07/14 09:01 AM
                                                      David's Paul A. Clayton2015/07/14 09:37 AM
                                                      David's 2015-07-12 10:34 post confirmed some of that (NT)Paul A. Clayton2015/07/14 09:39 AM
                                                    Example of memory ordering causing excitement in the real worldEtienne2015/07/17 01:15 AM
                                                  Example of memory ordering causing excitement in the real worlddmcq2015/07/13 02:14 PM
                                                  Reality is even worseTerry Gray2015/07/13 06:05 PM
                                                    Reality is even worseKonrad Schwarz2015/07/21 12:13 AM
                                                  A simple CAS/MCAS semantics2015/07/15 12:54 PM
                                                    A simple CAS/MCAS semanticsLinus Torvalds2015/07/15 01:55 PM
                                                    A simple CAS/MCAS semanticsEduardoS2015/07/15 02:31 PM
                                                Example of memory ordering causing excitement in the real worldsylt2015/07/13 02:19 PM
                                                  Example of memory ordering causing excitement in the real worlddmcq2015/07/13 03:24 PM
                                                    Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 04:48 PM
                                                      Example of memory ordering causing excitement in the real worldMaynard Handley2015/07/13 07:18 PM
                                                        Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 07:57 PM
                                                      Example of memory ordering causing excitement in the real worldanon2015/07/13 09:01 PM
                                                    What high level languages do you have in mind?Mark Roulo2015/07/13 05:00 PM
                                                      What high level languages do you have in mind?dmcq2015/07/14 06:54 AM
                                                  Example of memory ordering causing excitement in the real worldWilco2015/07/13 04:36 PM
                                                    Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 04:56 PM
                                                      Example of memory ordering causing excitement in the real worldanon2015/07/13 06:43 PM
                                                        Example of memory ordering causing excitement in the real worldEduardoS2015/07/13 08:11 PM
                                                          Example of memory ordering causing excitement in the real worldanon2015/07/13 09:07 PM
                                      Example of memory ordering causing excitement in the real worldMaynard Handley2015/07/12 12:32 PM
                                        Example of memory ordering causing excitement in the real worldEduardoS2015/07/12 01:35 PM
                                        Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/12 01:38 PM
                                          Example of memory ordering causing excitement in the real worldEduardoS2015/07/12 06:47 PM
                                            Example of memory ordering causing excitement in the real worldNoSpammer2015/07/13 12:34 PM
                                              Example of memory ordering causing excitement in the real worldWilco2015/07/13 04:50 PM
                                                Example of memory ordering causing excitement in the real worldNoSpammer2015/07/14 02:02 PM
                                                  Example of memory ordering causing excitement in the real worldanon2015/07/14 09:37 PM
                                                    Example of memory ordering causing excitement in the real worldMichael S2015/07/15 01:19 AM
                                                      Example of memory ordering causing excitement in the real worldanon2015/07/15 02:26 AM
                                                        Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 07:05 AM
                                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/15 08:04 AM
                                                            Example of memory ordering causing excitement in the real worldMichael S2015/07/15 08:29 AM
                                                              Example of memory ordering causing excitement in the real worlddmcq2015/07/15 10:09 AM
                                                              Can string ops use microarchitectural state?Paul A. Clayton2015/07/16 09:33 AM
                                                                Can string ops use microarchitectural state?rwessel2015/07/16 01:00 PM
                                                                  Can string ops use microarchitectural state?Paul A. Clayton2015/07/16 06:16 PM
                                                                    Can string ops use microarchitectural state?rwessel2015/07/16 09:34 PM
                                                                      Can string ops use microarchitectural state?Michael S2015/07/17 05:39 AM
                                                                        Can string ops use microarchitectural state?rwessel2015/07/17 09:02 AM
                                                                Consider interrupt followed by task preemptionMichael S2015/07/16 04:31 PM
                                                                  Consider interrupt followed by task preemptionPaul A. Clayton2015/07/16 06:23 PM
                                                            Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 12:50 PM
                                                              Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 02:27 PM
                                                                Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 03:14 PM
                                                                  Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 05:42 PM
                                                      Example of memory ordering causing excitement in the real worldNoSpammer2015/07/15 02:44 AM
                                                    Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 02:17 PM
                                                      Example of memory ordering causing excitement in the real worldWilco2015/07/15 02:43 PM
                                                        Example of memory ordering causing excitement in the real worldanon2015/07/15 05:45 PM
                                                        Example of memory ordering causing excitement in the real worldLinus Torvalds2015/07/15 06:35 PM
                                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/16 02:46 AM
                                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/16 02:49 AM
                                        Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 07:15 AM
                                      Example of memory ordering causing excitement in the real worldanon2015/07/12 07:42 PM
                                        Example of memory ordering causing excitement in the real worldanon2015/07/12 09:48 PM
                                        Example of memory ordering causing excitement in the real worldDavid Kanter2015/07/12 10:34 PM
                                          Example of memory ordering causing excitement in the real worldMichael S2015/07/13 01:51 AM
                                            Example of memory ordering causing excitement in the real worldDavid Kanter2015/07/13 08:31 AM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/13 06:05 AM
                                            Example of memory ordering causing excitement in the real worldGabriele Svelto2015/07/17 05:40 AM
                                          Example of memory ordering causing excitement in the real worlddmcq2015/07/13 08:09 AM
                                        Example of memory ordering causing excitement in the real worldanon2015/07/13 07:46 AM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/14 04:12 AM
                                        Example of memory ordering causing excitement in the real worlddmcq2015/07/15 03:51 AM
                                          Example of memory ordering causing excitement in the real worldanon2015/07/15 04:38 AM
                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/15 06:21 AM
                                      Store queues in POWER/PowerPC processorsGabriele Svelto2015/07/16 01:55 AM
                                        Not sure about that conclusionDavid Kanter2015/07/16 07:34 AM
                                          The POWER4 had the same structureGabriele Svelto2015/07/17 05:20 AM
                                        Committing stores in program orderPaul A. Clayton2015/07/16 01:35 PM
                                          Committing stores in program orderMaynard Handley2015/07/17 12:52 PM
                                      Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/20 04:44 AM
                                        Example of memory ordering causing excitement in the real worldanon2015/07/20 07:29 AM
                                          Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 12:08 AM
                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/21 01:27 AM
                                            Example of memory ordering causing excitement in the real worldMichael S2015/07/21 03:11 AM
                                              Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 05:24 AM
                                            Example of memory ordering causing excitement in the real worldanon2015/07/21 06:22 AM
                                              Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/21 07:36 AM
                                                Example of memory ordering causing excitement in the real worldanon2015/07/21 08:25 AM
                                              Example of memory ordering causing excitement in the real worldanon2015/07/21 08:17 AM
                                                Example of memory ordering causing excitement in the real worldanon2015/07/21 09:50 AM
                                                Example of memory ordering causing excitement in the real worldGabriele Svelto2015/07/21 12:46 PM
                                                Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/22 12:35 AM
                                                  Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/22 01:37 AM
                                                  Example of memory ordering causing excitement in the real worldanon2015/07/23 03:17 AM
                                                    Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/23 04:59 AM
                                                      Example of memory ordering causing excitement in the real worldMichael S2015/07/23 07:31 AM
                                                        Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/23 03:38 PM
                                                          Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/23 11:44 PM
                                                            Example of memory ordering causing excitement in the real worlddmcq2015/07/24 01:08 AM
                                    Example of memory ordering causing excitement in the real worlddmcq2015/07/13 07:27 AM
                          Example of memory ordering causing excitement in the real worldKonrad Schwarz2015/07/16 05:11 AM
                      Example of memory ordering causing excitement in the real worldAnonymousse2015/07/16 05:07 AM
          Benefit of dynamic hammock predicationsomeotherdude2015/07/06 05:12 PM
            Benefit of dynamic hammock predicationMichael S2015/07/07 01:19 AM
          Benefit of dynamic hammock predicationPatrick Chase2015/07/06 10:20 PM
            SIMD predication is also helpful, of course (NT)Paul A. Clayton2015/07/07 07:45 AM
        Power8 branch conversionGabriele Svelto2015/07/07 02:50 AM
          isel works for storesPaul A. Clayton2015/07/07 07:43 AM
            isel works for storesPatrick Chase2015/07/07 11:08 AM
            isel DOES NOT work for storessomeotherdude2015/07/07 04:01 PM
              isel DOES NOT work for storesWilco2015/07/07 04:40 PM
              Yes it doesPatrick Chase2015/07/07 11:14 PM
                Yes it doesvvid2015/07/08 09:51 AM
            You don't need isel eitherGabriele Svelto2015/07/08 02:01 AM
              You don't need isel eitherPaul A. Clayton2015/07/08 04:46 AM
                You don't need isel eitherGabriele Svelto2015/07/08 05:22 AM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell green?