SPEC is NOT a representation of average workloads

By: Maynard Handley (name99.delete@this.name99.org), November 18, 2020 9:13 am
Room: Moderated Discussions
none (none.delete@this.none.com) on November 18, 2020 8:18 am wrote:
> Dummond D. Slow (mental.delete@this.protozoa.us) on November 18, 2020 7:17 am wrote:
> [...]
> > You know I am not completely sure about this as I can't check, but I heard that SPEC uses x264's
> > code WITHOUT SIMD assembly compiled (whether disabling ASM intentionally or not compiling with yasm
> > or whatever, no idea). If that is true it probably grossly changes character of the workload because
> > compiler autovectorization tends to fails on vectorizing multimedia integer algorithms. Normally,
> > x264 spends like 55% (figure given by devs 8-9 years back) in hand-tuned x86 SIMD.
>
> You're correct: no assembly (or intrinsics) are in any SPEC test; portability is paramount.
> So yes, that's not a good representation for the publicly available x264. But then it could
> be argued that you should use HW IP for that anyway, and so that part of SPEC is not very
> interesting; but it has quite a high IPC which makes it interesting to study.

x264 in SPEC is not there to help you decide which PC to buy for ripping DVD content!
It is there as an exemplar of certain styles of code: various generic compression techniques (so lots of bit by bit manipulation) and various image analysis techniques (so searches over images and image comparisons at various frequency granularities).
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TopicPosted ByDate
1st round of M1 GPU benchmarksMaynard Handley2020/11/16 12:46 PM
  1st round of M1 GPU benchmarksAdrian2020/11/16 01:02 PM
    1st round of M1 GPU benchmarksI_vs2020/11/17 01:18 AM
  1st round of M1 GPU benchmarksRType2020/11/16 01:06 PM
    1st round of M1 GPU benchmarksMaynard Handley2020/11/16 01:45 PM
      And the NZ'ers are first to deliver cinebench scoresMaynard Handley2020/11/16 02:58 PM
        And the NZ'ers are first to deliver cinebench scoresWill2020/11/16 03:30 PM
          re: "scaling"Dummond D. Slow2020/11/16 04:06 PM
            re: "scaling"Maynard Handley2020/11/16 04:29 PM
              re: "scaling"Dummond D. Slow2020/11/16 04:51 PM
                re: "scaling"Maynard Handley2020/11/16 05:51 PM
                  re: "scaling"Dummond D. Slow2020/11/16 06:22 PM
                    re: "scaling"Maynard Handley2020/11/16 06:23 PM
                      re: "scaling"Maynard Handley2020/11/16 06:27 PM
                        re: "scaling"Dummond D. Slow2020/11/16 06:37 PM
                          re: "scaling"Chester2020/11/16 08:25 PM
                          Actual power consumption values.Dummond D. Slow2020/11/17 07:05 AM
                    re: "scaling"Doug S2020/11/17 10:25 AM
                      Apple loses a lot by not having turbo and SMTDummond D. Slow2020/11/17 11:18 AM
                        Apple loses a lot by not having turbo and SMTDoug S2020/11/17 12:21 PM
                          Apple loses a lot by not having turbo and SMTblaine2020/11/19 05:18 PM
                            Apple loses a lot by not having turbo and SMTDummond D. Slow2020/11/19 05:31 PM
                        Apple loses a lot by not having turbo and SMTTJ2020/11/18 01:10 AM
                          Cinebench is NOT a representation of average workloadsAndrei F2020/11/18 05:21 AM
                            SPEC is NOT a representation of average workloadsChester2020/11/18 07:02 AM
                              SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 07:17 AM
                                SPEC is NOT a representation of average workloadsnone2020/11/18 08:18 AM
                                  x264 without SIMD is nonsenseDummond D. Slow2020/11/18 08:31 AM
                                  SPEC is NOT a representation of average workloadsMaynard Handley2020/11/18 09:13 AM
                                    SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 09:21 AM
                                      SPEC is NOT a representation of average workloadsWilco2020/11/18 09:42 AM
                                        role of hand-optimized assembly in multimedia encodersDummond D. Slow2020/11/18 11:06 AM
                                          role of hand-optimized assembly in multimedia encodersdifferent anon2020/11/18 01:27 PM
                                            role of hand-optimized assembly in multimedia encodersDummond D. Slow2020/11/18 02:47 PM
                                              role of hand-optimized assembly in multimedia encodersDummond D. Slow2021/05/18 12:29 PM
                                          role of hand-optimized assembly in multimedia encodersRichardC2020/11/18 03:42 PM
                                          role of hand-optimized assembly in multimedia encodersnone2020/11/19 07:17 AM
                                      SPEC is NOT a representation of average workloadsnone2020/11/18 10:14 AM
                                        SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 11:17 AM
                                      SPEC is NOT a representation of average workloadsMaynard Handley2020/11/18 11:03 AM
                                        SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 11:25 AM
                                          SPEC is NOT a representation of average workloadsMaynard Handley2020/11/18 12:03 PM
                                            SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 02:57 PM
                                              SPEC is NOT a representation of average workloadsMaynard Handley2020/11/18 04:36 PM
                                                SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 04:50 PM
                                                  SPEC is NOT a representation of average workloadsDoug S2020/11/19 09:13 AM
                                                    SPEC is NOT a representation of average workloads-.-2020/11/19 02:34 PM
                                                    SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/19 02:35 PM
                                              SPEC is NOT a representation of average workloadsEtienne Lorrain2020/11/19 04:04 AM
                                                SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/19 05:58 AM
                                SPEC is NOT a representation of average workloadsChester2020/11/18 02:06 PM
                                  about bitratesDummond D. Slow2020/11/18 03:04 PM
                                    about bitratesChester2020/11/19 02:45 PM
                                  SPEC is NOT a representation of average workloadsOok2020/11/18 03:05 PM
                                    SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 03:21 PM
                                  SPEC is NOT a representation of average workloadsNoSpammer2020/11/19 06:48 AM
                              SPEC is NOT a representation of average workloadsAndrei F2020/11/18 07:44 AM
                                SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 07:48 AM
                                  SPEC is NOT a representation of average workloadsAdrian2020/11/18 08:15 AM
                                    SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 08:41 AM
                                      SPEC is NOT a representation of average workloadsAdrian2020/11/18 09:04 AM
                                        SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 09:32 AM
                                          SPEC is NOT a representation of average workloadsAdrian2020/11/18 10:26 AM
                                    SPEC is NOT a representation of average workloadsMaynard Handley2020/11/18 09:22 AM
                                      SPEC is NOT a representation of average workloadsAdrian2020/11/18 10:28 AM
                                  SPEC is NOT a representation of average workloadsAndrei F2020/11/18 08:34 AM
                                    SPEC is NOT a representation of average workloadsDummond D. Slow2020/11/18 09:00 AM
                                    SPEC is NOT a representation of average workloadsChester2020/11/18 02:18 PM
                                    SPEC is NOT a representation of average workloadsJukka Larja2020/11/20 08:03 AM
                                SPEC is NOT a representation of average workloadsChester2020/11/18 02:13 PM
                              SPEC is NOT a representation of average workloadsnone2020/11/18 08:07 AM
                                SPEC is NOT a representation of average workloadsMichael S2020/11/18 01:33 PM
                                  Interesting, thanks! (NT)none2020/11/19 07:03 AM
                            Cinebench is NOT a representation of average workloadsrwessel2020/11/18 07:03 AM
                              Cinebench is NOT a representation of average workloadsDoug S2020/11/18 07:44 AM
                                Cinebench is NOT a representation of average workloadsDummond D. Slow2020/11/18 07:52 AM
                                  Cinebench is NOT a representation of average workloadsDoug S2020/11/18 02:59 PM
                                    Cinebench is NOT a representation of average workloadsDummond D. Slow2020/11/18 03:12 PM
                                      Cinebench is NOT a representation of average workloadsDoug S2020/11/19 09:19 AM
                                        Cinebench is NOT a representation of average workloadsDummond D. Slow2020/11/19 03:03 PM
                                          Cinebench is NOT a representation of average workloadsUngo2020/11/19 08:12 PM
                                            Cinebench is NOT a representation of average workloadsDummond D. Slow2020/11/20 08:45 AM
                                It's not really SMT or adding small coresDummond D. Slow2020/11/18 07:58 AM
                                  It's not really SMT or adding small coresDoug S2020/11/18 03:02 PM
                                    It's not really SMT or adding small coresDummond D. Slow2020/11/18 03:27 PM
                                Cinebench is NOT a representation of average workloadsxyz2020/11/18 12:14 PM
                                  Cinebench is NOT a representation of average workloadsMaynard Handley2020/11/18 12:54 PM
                                    Cinebench is NOT a representation of average workloadsGabriele Svelto2020/11/18 01:41 PM
                                      Cinebench is NOT a representation of average workloadsMaynard Handley2020/11/18 01:52 PM
                                        Cinebench is NOT a representation of average workloadsGabriele Svelto2020/11/18 02:05 PM
                            Cinebench is NOT a representation of average workloadsTJ2020/11/18 11:46 AM
                            SMT shines in IO heavy & commercial DB workloadsxyz2020/11/18 12:05 PM
                            "Average workloads" don't exist (NT)Foo_2020/11/19 02:55 AM
                          Apple loses a lot by not having turbo and SMTDummond D. Slow2020/11/18 07:02 AM
                            Apple loses a lot by not having turbo and SMTMaynard Handley2020/11/18 08:37 AM
                              Apple loses a lot by not having turbo and SMTDummond D. Slow2020/11/18 08:55 AM
                              Apple loses a lot by not having turbo and SMTDavid Hess2020/11/18 12:12 PM
                                Apple loses a lot by not having turbo and SMTMaynard Handley2020/11/18 01:12 PM
                                  Apple loses a lot by not having turbo and SMTJörn Engel2020/11/18 04:04 PM
                                    Apple loses a lot by not having turbo and SMTanonymou52020/11/18 04:37 PM
                                      Apple loses a lot by not having turbo and SMTJörn Engel2020/11/19 03:28 AM
                                  Apple loses a lot by not having turbo and SMTDavid Hess'2020/11/19 06:25 PM
                          Apple loses a lot by not having turbo and SMTAdrian2020/11/18 07:23 AM
                            Apple loses a lot by not having turbo and SMTgallier22020/11/18 11:21 PM
                              Apple loses a lot by not having turbo and SMTJames2020/11/19 01:22 AM
                                Apple loses a lot by not having turbo and SMTWilco2020/11/19 04:06 AM
                              Apple loses a lot by not having turbo and SMTanonymou52020/11/19 01:34 AM
                                Apple loses a lot by not having turbo and SMTgallier22020/11/19 08:04 AM
                                  big.LITTLE with different ISAsJames2020/11/19 08:41 AM
                                    big.LITTLE with different ISAsgallier22020/11/20 02:36 AM
                                    big.LITTLE with different ISAsanon2020/11/20 12:31 PM
                              Apple loses a lot by not having turbo and SMTAdrian2020/11/19 01:56 AM
                        Apple loses a lot by not having turbo and SMTJon Masters2020/11/18 11:46 AM
                          Apple loses a lot by not having turbo and SMTanonymou52020/11/18 02:41 PM
                          Apple loses a lot by not having turbo and SMTDummond D. Slow2020/11/18 03:17 PM
                            Apple loses a lot by not having turbo and SMTMaynard Handley2020/11/18 04:46 PM
                              Apple loses a lot by not having turbo and SMTJon Masters2020/11/18 11:31 PM
                                Apple loses a lot by not having turbo and SMTDummond D. Slow2020/11/19 06:01 AM
                              Apple loses a lot by not having turbo and SMTAdrian2020/11/19 01:50 AM
                                Apple loses a lot by not having turbo and SMTAdrian2020/11/19 02:10 AM
                                Apple loses a lot by not having turbo and SMTMaynard Handley2020/11/19 09:13 AM
                                  Apple loses a lot by not having turbo and SMTDummond D. Slow2020/11/19 03:10 PM
                        Apple loses a lot by not having turbo and SMTjuanrga2020/11/19 01:49 AM
                    re: "scaling"sr2020/11/17 11:39 AM
                      re: "scaling"Adrian2020/11/17 12:41 PM
                        re: "scaling"Adrian2020/11/17 12:52 PM
                          re: "scaling"Chester2020/11/17 05:29 PM
                  re: "scaling"anonymou52020/11/16 07:18 PM
                    re: "scaling"Maynard Handley2020/11/16 07:44 PM
        And the NZ'ers are first to deliver cinebench scoresDummond D. Slow2020/11/16 04:12 PM
          And the NZ'ers are first to deliver cinebench scoresMaynard Handley2020/11/16 04:31 PM
            And the NZ'ers are first to deliver cinebench scoresDummond D. Slow2020/11/16 04:46 PM
        And the NZ'ers are first to deliver cinebench scoresMaynard Handley2020/11/16 06:04 PM
          And the NZ'ers are first to deliver cinebench scoresDummond D. Slow2020/11/16 06:28 PM
  1st round of M1 GPU benchmarksRayla2020/11/16 03:16 PM
    1st round of M1 GPU benchmarksChester2020/11/16 08:17 PM
  Phoronix Mac mini M1 benchanon52020/11/20 10:51 AM
    Phoronix Mac mini M1 benchPer Hesselgren2020/11/24 09:04 AM
      Phoronix Mac mini M1 benchPaul2020/11/25 02:08 AM
        Phoronix Mac mini M1 benchPaul2020/11/25 02:12 AM
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