Big gotchas: poor specs

By: Linus Torvalds (torvalds.delete@this.linux-foundation.org), August 10, 2019 11:13 am
Room: Moderated Discussions
anon (spam.delete.delete@this.this.spam.com) on August 10, 2019 11:25 am wrote:
>
> If Linus is interested in the 3950X as an upgrade and not the 3900X (or even 3800X) I
> highly doubt it's for the single thread performance.

I'm a big proponent of single-thread performance in general, because a lot of real-world problems really do end up being fairly limited by Amdahl.

So you'll find me often talking up single-core performance, and I absolutely despise the "flock of chickens" machines.

But realistically, Zen 2 is clearly in the "good enough" territory for anything I do on that front. It will open that huge pdf file without me twiddling my thumbs, even when that's almost entirely single-threaded. And once something performs well enough, all that I really do is build the kernel. Which is actually ludicrously well parallelized - more so than most other projects are.

So I think single-thread performance is king, but I also know that the only thing I personally do doesn't really care all that deeply. We've got a couple of link stages and a few other serialized parts, but the really expensive parts when I do a full re-build can easily use hundreds of cores.

I just don't think that because I can use hundreds of cores that that is necessarily a good fit for a lot of other real-life problems.

From a performance standpoint I could easily use server-class machines (or something like Threadripper). Or even a farm. It's just that I also want it to be quiet and a convenient form factor, and easily available. If I can't buy the parts at the local Fry's or with two-day shipping off Amazon, I'm just not interested. You can keep your bespoke stuff. I believe in mass market.

Linus
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EPYC SAP-SD 2-tier benchmark resultsMichael S2019/08/08 04:18 AM
  EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownMichael S2019/08/08 07:29 AM
    Wrong headline. Should be "SPECpower_ssj2008 - EPYC2 is in class of its own" (NT)Michael S2019/08/08 07:51 AM
    EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownAlberto2019/08/08 02:42 PM
      EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownblue2019/08/08 06:35 PM
      EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownMaynard Handley2019/08/08 07:58 PM
        EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownanon2019/08/09 01:00 AM
          EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownAlberto2019/08/09 02:09 AM
            EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownblue2019/08/09 07:47 AM
        EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownAlberto2019/08/09 01:12 AM
          EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownMaynard Handley2019/08/09 08:25 AM
            EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownDoug S2019/08/09 08:33 AM
              EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownanon2019/08/09 09:24 AM
            EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownAlberto2019/08/10 03:04 AM
          EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownanon.12019/08/09 04:30 PM
        EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownme2019/08/09 08:58 PM
      EPYC SAP-SD 2-tier benchmark results - EPYC2 is in class of its ownanon2019/08/08 11:47 PM
  EPYC SAP-SD 2-tier benchmark resultsLinus Torvalds2019/08/09 02:29 PM
    EPYC SAP-SD 2-tier benchmark resultsanon2019/08/10 06:20 AM
      EPYC SAP-SD 2-tier benchmark resultsme2019/08/10 06:36 AM
        EPYC SAP-SD 2-tier benchmark resultsanon2019/08/10 07:20 AM
          EPYC SAP-SD 2-tier benchmark resultsanon.12019/08/10 08:40 AM
            EPYC SAP-SD 2-tier benchmark resultsanon2019/08/10 09:38 AM
          EPYC SAP-SD 2-tier benchmark resultsblue2019/08/10 08:47 AM
        EPYC SAP-SD 2-tier benchmark resultsAdrian2019/08/10 09:43 AM
          EPYC SAP-SD 2-tier benchmark resultsme2019/08/10 10:06 AM
            EPYC SAP-SD 2-tier benchmark resultsMichael S2019/08/10 10:28 AM
    Big gotchas: poor specsjohn2019/08/10 09:54 AM
      Big gotchas: poor specsme2019/08/10 10:04 AM
      Big gotchas: poor specsanon2019/08/10 10:25 AM
        Big gotchas: poor specsLinus Torvalds2019/08/10 11:13 AM
          Big gotchas: poor specsanon2019/08/10 12:58 PM
          Big gotchas: poor caches2019/08/12 12:51 AM
            Big gotchas: poor caches2019/08/12 12:59 AM
            Big gotchas: poor cachesTravis Downs2019/08/12 08:15 AM
              parallelism vs. efficiencyhobold2019/08/13 03:43 AM
            Big gotchas: poor cachesAndy N2019/08/12 05:45 PM
              Big gotchas: poor cachesanon2019/08/12 11:43 PM
          Big gotchas: poor specsJouni Osmala2019/08/12 09:18 PM
            Big gotchas: poor specsAdrian2019/08/12 10:58 PM
              Kernel compile 25-30s, noise 25-27dBJouni Osmala2019/08/13 03:00 AM
                Quiet and fast workstationsGian-Carlo Pascutto2019/08/13 05:00 AM
                  Quiet and fast workstationsAdrian2019/08/13 06:01 AM
                  Quiet and fast workstationsDavid Hess2019/08/13 12:51 PM
                    Quiet and fast workstationsGian-Carlo Pascutto2019/08/13 11:43 PM
                      Quiet and fast workstationsMichael S2019/08/14 01:09 AM
                        Quiet and fast workstationsGian-Carlo Pascutto2019/08/14 01:59 AM
                          Quiet and fast workstationsDavid Hess2019/08/14 05:05 PM
                        Quiet and fast workstationsDavid Hess2019/08/14 04:56 PM
                      Quiet and fast workstationsDavid Hess2019/08/14 05:30 PM
                  Passively cooled threadripper/xeon WJouni Osmala2019/08/15 02:12 AM
                    Passively cooled threadripper/xeon WAdrian2019/08/15 02:47 AM
                      Passively cooled threadripper/xeon WJouni Osmala2019/08/15 04:58 AM
                        Passively cooled threadripper/xeon WAdrian2019/08/15 11:12 PM
                          Passively cooled threadripper/xeon WAdrian2019/08/15 11:21 PM
                          Passively cooled threadripper/xeon WJouni osmala2019/08/16 08:46 AM
                            Passively cooled threadripper/xeon WGroo2019/08/16 11:07 AM
                Kernel compile 25-30s, noise 25-27dBAdrian2019/08/13 05:39 AM
                Kernel compile 25-30s, noise 25-27dBLinus Torvalds2019/08/13 11:12 AM
                  which graphics card?anonymous22019/08/13 11:52 AM
                    which graphics card?Linus Torvalds2019/08/13 12:12 PM
                  Kernel compile 25-30s, noise 25-27dBDoug S2019/08/13 02:22 PM
                    Kernel compile 25-30s, noise 25-27dBDavid Hess2019/08/14 05:38 PM
                  Kernel compile 25-30s, noise 25-27dBJouni Osmala2019/08/13 11:09 PM
                    AIOsGroo2019/08/14 06:19 AM
                      AIOsGian-Carlo Pascutto2019/08/14 07:52 AM
                        AIOsGroo2019/08/14 08:49 AM
                      AIOsBrett2019/08/14 01:02 PM
                    Kernel compile 25-30s, noise 25-27dBLinus Torvalds2019/08/14 10:10 AM
                  Kernel compile 25-30s, noise 25-27dBGian-Carlo Pascutto2019/08/14 12:33 AM
                    Kernel compile 25-30s, noise 25-27dBAdrian2019/08/14 04:06 AM
                      Kernel compile 25-30s, noise 25-27dBGian-Carlo Pascutto2019/08/14 08:01 AM
                      AMD Bios, etc..Anon2019/08/14 10:39 PM
                        AMD Bios, etc..hobold2019/08/15 06:10 AM
                          AMD Bios, etc..Anon2019/08/15 03:20 PM
                        AMD Bios, etc..Jan Olšan2019/08/15 07:49 AM
                          AMD Bios, etc..Adrian2019/08/15 08:16 AM
                          AMD Bios, etc..Gro2019/08/15 09:57 AM
                        AMD Bios, etc..David Hess2019/08/16 04:39 AM
      Big gotchas: poor specsAdrian2019/08/10 12:28 PM
      Big gotchas: poor specsDummond D. Slow2019/08/10 12:57 PM
        Big gotchas: poor specsanon22019/08/10 11:33 PM
          Big gotchas: poor specsblue2019/08/10 11:57 PM
          Big gotchas: poor specsAdrian2019/08/11 04:41 AM
            Big gotchas: poor specsaaron spink2019/08/12 08:45 AM
              Big gotchas: poor specsFoo_2019/08/12 10:02 AM
              Big gotchas: poor specsTravis Downs2019/08/12 10:26 AM
                Big gotchas: poor specsGabriele Svelto2019/08/13 08:48 AM
                Big gotchas: poor specsaaron spink2019/08/13 06:23 PM
                  Big gotchas: poor specsDoug S2019/08/13 10:15 PM
                    Big gotchas: poor specsGian-Carlo Pascutto2019/08/14 12:35 AM
                    Big gotchas: poor specsaaron spink2019/08/15 04:16 PM
                      Big gotchas: poor specsJouni Osmala2019/08/15 08:03 PM
                        Big gotchas: poor specsaaron spink2019/08/19 03:05 AM
                          Big gotchas: poor specsMichael S2019/08/19 03:37 AM
                            Big gotchas: poor specsRicardo B2019/08/19 04:40 PM
                              Big gotchas: poor specsAaron Spink2019/08/25 01:29 AM
              Big gotchas: poor specsAdrian2019/08/12 10:31 AM
              Big gotchas: poor specsJukka Larja2019/08/13 06:37 AM
              Big gotchas: poor specsLinus Torvalds2019/08/13 10:31 AM
          Big gotchas: poor specsDummond D. Slow2019/08/11 05:23 AM
      FX-9590 > i7-9700KGian-Carlo Pascutto2019/08/12 09:37 AM
    RDRAND issueanonymou52019/08/10 01:52 PM
      RDRAND issueLinus Torvalds2019/08/10 03:15 PM
        RDRAND issueGionatan Danti2019/08/11 12:35 AM
          RDRAND issueLinus Torvalds2019/08/11 09:43 AM
            RDRAND issueLinus Torvalds2019/08/11 10:05 AM
              RDRAND issue@never_released2019/08/11 10:10 AM
                RDRAND issueLinus Torvalds2019/08/11 12:13 PM
                  Err....Groo2019/08/11 05:47 PM
                    Err.... This is a zero content fud posteye roll2019/08/11 07:48 PM
                    Err....Brendan2019/08/11 07:50 PM
                    Err....Jukka Larja2019/08/12 06:38 AM
                  RDRAND issueJose2019/08/12 01:33 AM
              RDRAND issueGionatan Danti2019/08/11 01:12 PM
            RDRAND issueaaron spink2019/08/12 08:18 AM
      RDRAND issuename2019/08/11 08:35 AM
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