Yitian 710

By: Wilco (wilco.dijkstra.delete@this.ntlworld.com), July 21, 2022 5:33 am
Room: Moderated Discussions
Anon (no.delete@this.spam.com) on July 21, 2022 5:17 am wrote:
> Wilco (wilco.dijkstra.delete@this.ntlworld.com) on July 21, 2022 4:31 am wrote:
> > No it's 0.4MB vs 0.13MB per core, so 3.2 times.
>
> Why did you forget the 1MB L2 cache? 1.4MB vs 1.125MB is just 12% more.

How does the L2 matter? It's the same so you get the same amount of cachemisses either way. Only the L3 is different, so that means L3 misses will be much higher, resulting in far higher memory latency. And that is what slows you down.

> > No. Remember it was your claim was they are all memory bandwidth limited, hence they should all score
> > identically once you have enough cores to max out memory. I've shown that's not true at all.
>
> They don't have to score identically to be bandwidth limited, if they are limited in part of the
> benchmark the score will increase much less than the core count, which is exactly what happens.

No that is not at all what happens - the score actually decreases significantly. Remember once again, the memory bandwidth is identical between Altra and Altra Max, so if what you say is true then you'd expect a small increase in the score, rather than a huge drop.

> > And now you seem to be claiming that they are not limited at all
> > by memory bandwidth but by the core and compiler flags?!?
>
> No, I am claiming that official results and Anandtech results are not comparable because of compiler flags.

I've already shown that compiler flags don't make much difference here - it's not like O3, Ofast or LTO change your memory bandwidth! The size of the input dataset and how well it fits in the cache is what matters (MCF uses a huge dataset which stresses the memory system).

Wilco

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Yitian 710 anonymous22021/10/20 08:57 PM
  Yitian 710 Adrian2021/10/21 12:20 AM
  Yitian 710 Wilco2021/10/21 03:47 AM
    Yitian 710 Rayla2021/10/21 05:52 AM
      Yitian 710 Wilco2021/10/21 11:59 AM
        Yitian 710 anon22021/10/21 05:16 PM
        Yitian 710 Wilco2022/07/16 12:21 PM
          Yitian 710 Anon2022/07/16 08:22 PM
            Yitian 710 Rayla2022/07/17 09:10 AM
              Yitian 710 Anon2022/07/17 12:04 PM
                Yitian 710 Rayla2022/07/17 12:08 PM
                  Yitian 710 Wilco2022/07/17 01:16 PM
                    Yitian 710 Anon2022/07/17 01:32 PM
                      Yitian 710 Wilco2022/07/17 02:22 PM
                        Yitian 710 Anon2022/07/17 02:47 PM
                          Yitian 710 Wilco2022/07/17 03:50 PM
                            Yitian 710 Anon2022/07/17 08:46 PM
                              Yitian 710 Wilco2022/07/18 03:01 AM
                                Yitian 710 Anon2022/07/19 11:21 AM
                                  Yitian 710 Wilco2022/07/19 06:15 PM
                                    Yitian 710 Anon2022/07/21 01:25 AM
                                      Yitian 710 none2022/07/21 01:49 AM
                                        Yitian 710 Anon2022/07/21 03:03 AM
                                          Yitian 710 none2022/07/21 04:34 AM
                                      Yitian 710 James2022/07/21 02:29 AM
                                        Yitian 710 Anon2022/07/21 03:05 AM
                                      Yitian 710 Wilco2022/07/21 04:31 AM
                                        Yitian 710 Anon2022/07/21 05:17 AM
                                          Yitian 710 Wilco2022/07/21 05:33 AM
                                            Yitian 710 Anon2022/07/21 05:50 AM
                                              Yitian 710 Wilco2022/07/21 06:07 AM
                                                Yitian 710 Anon2022/07/21 06:20 AM
                                                  Yitian 710 Wilco2022/07/21 10:02 AM
                                                    Yitian 710 Anon2022/07/21 10:22 AM
                    Yitian 710 Adrian2022/07/17 11:09 PM
                      Yitian 710 Wilco2022/07/18 01:15 AM
                        Yitian 710 Adrian2022/07/18 02:35 AM
          Yitian 710 Adrian2022/07/16 11:19 PM
            Computations on Big IntegersBill G2022/07/25 10:06 PM
              Computations on Big Integersnone2022/07/25 11:35 PM
                x86 MUL 64x64 Eric Fink2022/07/26 01:06 AM
                  x86 MUL 64x64 Adrian2022/07/26 02:27 AM
                  x86 MUL 64x64 none2022/07/26 02:38 AM
                    x86 MUL 64x64 Jörn Engel2022/07/26 10:17 AM
                      x86 MUL 64x64 Linus Torvalds2022/07/27 10:13 AM
                        x86 MUL 64x64 2022/07/28 09:40 AM
                        x86 MUL 64x64 Jörn Engel2022/07/28 10:18 AM
                          More than 3 registers per instruction-.-2022/07/28 07:01 PM
                            More than 3 registers per instructionAnon2022/07/28 10:39 PM
                            More than 3 registers per instructionJörn Engel2022/07/28 10:42 PM
                              More than 3 registers per instruction-.-2022/07/29 04:31 AM
                Computations on Big IntegersBill G2022/07/26 01:40 AM
                  Computations on Big Integersnone2022/07/26 02:17 AM
                    Computations on Big IntegersBill G2022/07/26 03:52 AM
                    Computations on Big Integers---2022/07/26 09:57 AM
                  Computations on Big IntegersAdrian2022/07/26 02:53 AM
                    Computations on Big IntegersBill G2022/07/26 03:39 AM
                      Computations on Big IntegersAdrian2022/07/26 04:21 AM
                    Computations on Big Integers in Apple AMX UnitsBill G2022/07/26 04:28 AM
                      Computations on Big Integers in Apple AMX UnitsAdrian2022/07/26 05:13 AM
                        TypoAdrian2022/07/26 05:20 AM
                          IEEE binary64 is 53 bits rather than 52. (NT)Michael S2022/07/26 05:34 AM
                            IEEE binary64 is 53 bits rather than 52.Adrian2022/07/26 07:32 AM
                              IEEE binary64 is 53 bits rather than 52.Michael S2022/07/26 10:02 AM
                                IEEE binary64 is 53 bits rather than 52.Adrian2022/07/27 06:58 AM
                                  IEEE binary64 is 53 bits rather than 52.none2022/07/27 07:14 AM
                                    IEEE binary64 is 53 bits rather than 52.Adrian2022/07/27 07:55 AM
                                      Thanks a lot for the link to the article! (NT)none2022/07/27 08:09 AM
                          TypozArchJon2022/07/26 09:51 AM
                            TypoMichael S2022/07/26 10:25 AM
                              TypozArchJon2022/07/26 11:52 AM
                                TypoMichael S2022/07/26 01:02 PM
                    Computations on Big IntegersMichael S2022/07/26 05:55 AM
                      Computations on Big IntegersAdrian2022/07/26 07:59 AM
                        IFMA and DivisionBill G2022/07/26 04:25 PM
                          IFMA and Divisionrwessel2022/07/26 08:16 PM
                          IFMA and DivisionAdrian2022/07/27 07:25 AM
                      Computations on Big Integersnone2022/07/27 01:22 AM
                    Big integer multiplication with vector IFMABill G2022/07/29 01:06 AM
                      Big integer multiplication with vector IFMAAdrian2022/07/29 01:35 AM
                        Big integer multiplication with vector IFMA-.-2022/07/29 04:32 AM
                          Big integer multiplication with vector IFMAAdrian2022/07/29 09:47 PM
                            Big integer multiplication with vector IFMAAnon2022/07/30 08:12 AM
                              Big integer multiplication with vector IFMAAdrian2022/07/30 09:27 AM
                                AVX-512 unfriendly to heter-performance coresPaul A. Clayton2022/07/31 03:20 PM
                                  AVX-512 unfriendly to heter-performance coresAnon2022/07/31 03:33 PM
                                    AVX-512 unfriendly to heter-performance coresanonymou52022/07/31 05:03 PM
                                  AVX-512 unfriendly to heter-performance coresBrett2022/07/31 07:26 PM
                                  AVX-512 unfriendly to heter-performance coresAdrian2022/08/01 01:45 AM
                                    Why can't E-cores have narrow/slow AVX-512? (NT)anonymous22022/08/01 03:37 PM
                                      Why can't E-cores have narrow/slow AVX-512?Ivan2022/08/02 12:09 AM
                                        Why can't E-cores have narrow/slow AVX-512?anonymou52022/08/02 10:13 AM
                                        Why can't E-cores have narrow/slow AVX-512?Dummond D. Slow2022/08/02 03:02 PM
                                    AVX-512 unfriendly to heter-performance coresPaul A. Clayton2022/08/02 01:19 PM
                                      AVX-512 unfriendly to heter-performance coresAnon2022/08/02 09:09 PM
                                      AVX-512 unfriendly to heter-performance coresAdrian2022/08/03 12:50 AM
                                        AVX-512 unfriendly to heter-performance coresAnon2022/08/03 09:15 AM
                                          AVX-512 unfriendly to heter-performance cores-.-2022/08/03 08:17 PM
                                            AVX-512 unfriendly to heter-performance coresAnon2022/08/03 09:02 PM
                        IFMA: empty promises from Intel as usualKent R2022/07/29 07:15 PM
                          No hype lasts foreverAnon2022/07/30 08:06 AM
                        Big integer multiplication with vector IFMAme2022/07/30 09:15 AM
                Computations on Big Integers---2022/07/26 09:48 AM
                  Computations on Big Integersnone2022/07/27 01:10 AM
                    Computations on Big Integers---2022/07/28 11:43 AM
                      Computations on Big Integers---2022/07/28 06:44 PM
              Computations on Big Integersdmcq2022/07/26 02:27 PM
                Computations on Big IntegersAdrian2022/07/27 08:15 AM
                  Computations on Big IntegersBrett2022/07/27 11:07 AM
      Yitian 710 Wes Felter2021/10/21 12:51 PM
        Yitian 710 Adrian2021/10/21 01:25 PM
    Yitian 710 Anon2021/10/21 06:08 AM
      Strange definition of the word single. (NT)anon22021/10/21 05:00 PM
        AMD Epyc uses chiplets. This is why "strange"?Mark Roulo2021/10/21 05:08 PM
          AMD Epyc uses chiplets. This is why "strange"?anon22021/10/21 05:34 PM
            Yeah. Blame spec.org, too, though!Mark Roulo2021/10/21 05:58 PM
              Yeah. Blame spec.org, too, though!anon22021/10/21 08:07 PM
                Yeah. Blame spec.org, too, though!Björn Ragnar Björnsson2022/07/17 06:23 AM
              Yeah. Blame spec.org, too, though!Rayla2022/07/17 09:13 AM
                Yeah. Blame spec.org, too, though!Anon2022/07/17 12:01 PM
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