Avoiding ping pong

By: Patrick Chase (patrickjchase.delete@this.gmail.com), December 9, 2014 1:06 pm
Room: Moderated Discussions
Maynard Handley (name99.delete@this.name99.org) on December 9, 2014 11:41 am wrote:
> Of course, per my previous post, the obvious rejoinder to this
> would be: "get a better language and a better codebase".
> Now that is flip, but it carries a core of truth. IF your goal is to keep on using an
> ancient codebase indefinitely, then you're, more or less by definition, in the business
> of wanting computers that look exactly like what the ancient codebase targeted, only
> faster. Point is, new codebases come along as well, and THEY are willing to adapt
> themselves to new hardware.
>
> IBM seems to be doing OK selling mainframes, but I don't see the rest of us assuming that
> we need to write our code using mainframe paradigms. At some point a Google says "to hell
> with this, we're starting from scratch and can organize things completely differently"...

Being careful as to what I say here as I work (but definitely don't speak) for Google these days...

I think the difference is that the "micro revolution" was a technology-driven sea change that fundamentally made mainframes less competitive. VLSI enabled CMOS microprocessors that rivaled the (traditionally) ECL-based mainframes for performance at vastly lower cost.

While you're right that the specific issue Gabriele raised can be mitigated by a different language choice, that isn't generally true. There have been no fundamental technological breakthroughs that make parallelism easier/cheaper to achieve than it was, say, a decade ago. No magical compilers, no breakthrough methodologies or languages, and therefore no substantive mitigation of Amdahl's law.

While there is certainly pressure from the semiconductor process side that limits the pace of improvement of serial performance, I don't see anything that would actually shift the equilibrium/optimum in favor of smaller cores.

I therefore think 'anon' had it about right: We'll continue to muddle along by improving per-core performance where we can and increasing parallelism where we must. It's not a terribly sexy vision, but sometimes reality works that way.

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TopicPosted ByDate
ARMv8 getting atomic operationsdmcq12/02/14 05:32 PM
  ARMv8 getting atomic operationsMaynard Handley12/02/14 07:33 PM
    ARMv8 getting atomic operationsDoug S12/02/14 10:30 PM
      ARMv8 getting atomic operationsdmcq12/03/14 03:16 AM
      ARMv8 getting atomic operationsMaynard Handley12/03/14 09:20 AM
      ARMv8 getting atomic operationsBrett12/03/14 04:46 PM
    ARMv8 getting atomic operationsAndreas12/03/14 06:51 AM
      ARMv8 getting atomic operationsLinus Torvalds12/03/14 11:15 AM
        ARMv8 getting atomic operationsanon12/03/14 05:08 PM
          Guaranteed transactionsPaul A. Clayton12/03/14 08:04 PM
            Guaranteed transactionsanon12/03/14 08:38 PM
              Avoiding ping pongPaul A. Clayton12/04/14 09:11 AM
                Avoiding ping ponganon12/04/14 10:15 AM
                  OoO window is limitedPaul A. Clayton12/04/14 01:06 PM
                Avoiding ping pongAaron Spink12/04/14 12:01 PM
                  Avoiding ping pongKonrad Schwarz12/04/14 01:10 PM
                    Avoiding ping pongAaron Spink12/04/14 02:31 PM
                    Avoiding ping pongGabriele Svelto12/04/14 02:49 PM
                      Avoiding ping pongKonrad Schwarz12/04/14 11:08 PM
                        Avoiding ping pongGabriele Svelto12/05/14 12:04 AM
                          Avoiding ping pongEric Bron nli12/05/14 02:28 AM
                            Avoiding ping pongKonrad Schwarz12/05/14 03:37 AM
                              Avoiding ping pongEric Bron nli12/05/14 04:23 AM
                                Avoiding ping pongKlimax12/05/14 05:47 AM
                                  Avoiding ping pongEric Bron12/05/14 06:24 AM
                              Avoiding ping pongGabriele Svelto12/05/14 10:38 AM
                                Avoiding ping pongKonrad Schwarz12/07/14 02:28 PM
                                  Avoiding ping pongGabriele Svelto12/08/14 07:10 PM
                                    Avoiding ping pongKonrad Schwarz12/09/14 05:12 AM
                                      Avoiding ping pongGabriele Svelto12/09/14 07:31 AM
                                        Avoiding ping ponganon12/09/14 11:24 PM
                            Avoiding ping pongGabriele Svelto12/05/14 10:17 AM
                              Avoiding ping pongEric Bron12/05/14 10:32 AM
                                Avoiding ping pongGabriele Svelto12/05/14 12:45 PM
                                  Avoiding ping pongEric Bron12/06/14 02:20 AM
                                    Avoiding ping pongnksingh12/06/14 03:42 AM
                                      Avoiding ping pongEric Bron12/06/14 04:04 AM
                                        Avoiding ping pongGiGNiC12/06/14 06:27 AM
                                          Avoiding ping pongEric Bron nli12/06/14 06:44 AM
                                          Avoiding ping pongEric Bron12/06/14 07:07 AM
                                            Avoiding ping pongnksingh12/07/14 04:06 PM
                                              Avoiding ping pongEric Bron12/08/14 04:17 AM
                                                Avoiding ping pongGiGNiC12/08/14 11:53 AM
                                                Avoiding ping pongnksingh12/08/14 05:53 PM
                                                  Avoiding ping pongEric Bron12/09/14 01:33 AM
                                    Avoiding ping pongdmsc12/06/14 04:12 AM
                                      Avoiding ping pongEric Bron12/06/14 04:25 AM
                                        Avoiding ping pongKlimax12/06/14 05:49 AM
                                          Avoiding ping pongrwessel12/07/14 02:34 AM
                                        Avoiding ping pongdmsc12/06/14 07:39 AM
                                        Avoiding ping pongKonrad Schwarz12/07/14 02:37 PM
                                          Avoiding ping pongMichael S12/07/14 04:37 PM
                                            Avoiding ping pongKonrad Schwarz12/08/14 04:35 AM
                          Avoiding ping pongKonrad Schwarz12/05/14 03:30 AM
                        Avoiding ping pongLinus Torvalds12/05/14 12:58 PM
                          Avoiding ping pongEric Bron12/06/14 02:42 AM
                            Avoiding ping pongnksingh12/06/14 03:51 AM
                              Avoiding ping pongEric Bron12/06/14 04:08 AM
                            Avoiding ping pongLinus Torvalds12/06/14 01:25 PM
                              Avoiding ping pongnksingh12/07/14 03:26 PM
                                Avoiding ping pongEric Bron12/08/14 04:35 AM
                                  Avoiding ping pongBrett12/08/14 10:00 AM
                                    Avoiding ping pongEric Bron12/08/14 10:48 AM
                                    Avoiding ping pongrwessel12/08/14 12:52 PM
                                      Avoiding ping pongBrett12/08/14 01:58 PM
                                      Avoiding ping pongDoug S12/08/14 02:04 PM
                              Avoiding ping pongJouni Osmala12/08/14 02:45 AM
                                Avoiding ping ponganon12/08/14 05:44 AM
                                  Avoiding ping pongJouni Osmala12/08/14 01:10 PM
                                    Avoiding ping pongLinus Torvalds12/08/14 01:34 PM
                                      Avoiding ping pongJouni Osmala12/08/14 03:47 PM
                                        Avoiding ping pongLinus Torvalds12/08/14 08:08 PM
                                          Avoiding ping pongGabriele Svelto12/09/14 07:48 AM
                                            Avoiding ping pongMaynard Handley12/09/14 11:41 AM
                                              Avoiding ping pongPatrick Chase12/09/14 01:06 PM
                                              Avoiding ping pongGabriele Svelto12/09/14 01:52 PM
                                                Avoiding ping pongPatrick Chase12/09/14 02:08 PM
                                            Why read RWT or Reddit when you can get journalists to do it for you?Rob Thorpe01/02/15 08:20 AM
                                              Why read RWT or Reddit when you can get journalists to do it for you?juanrga01/02/15 11:21 AM
                                                Why read RWT or Reddit when you can get journalists to do it for you?EduardoS01/02/15 11:37 AM
                                                  Why read RWT or Reddit when you can get journalists to do it for you?juanrga01/03/15 12:00 PM
                                                Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron nli01/02/15 02:28 PM
                                                  Why read RWT or Reddit when you can get journalists to do it for you?juanrga01/03/15 12:02 PM
                                                    Why read RWT or Reddit when you can get journalists to do it for you?Michael S01/03/15 12:36 PM
                                                      Why read RWT or Reddit when you can get journalists to do it for you?juanrga01/03/15 01:11 PM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Michael S01/03/15 01:30 PM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron01/03/15 02:57 PM
                                                            KNL cacheDavid Kanter01/03/15 07:36 PM
                                                              KNL cacheEric Bron01/04/15 03:34 AM
                                                                KNL cacheMichael S01/04/15 04:11 AM
                                                                  KNL cacheEric Bron01/04/15 04:57 AM
                                                                    KNL cacheMichael S01/04/15 05:21 AM
                                                                      KNL cacheEric Bron01/04/15 05:58 AM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?juanrga01/07/15 05:47 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Michael S01/07/15 08:27 AM
                                                              Manycores vs multicoresjuanrga01/10/15 04:10 PM
                                                                Manycores vs multicoresAaron Spink01/10/15 05:32 PM
                                                                  Manycores vs multicoresjuanrga01/10/15 06:32 PM
                                                                    Manycores vs multicoresExophase01/10/15 06:49 PM
                                                                      Manycores vs multicoresjuanrga01/10/15 08:21 PM
                                                                        Manycores vs multicoresExophase01/10/15 08:51 PM
                                                                        Manycores vs multicoresAaron Spink01/10/15 09:03 PM
                                                                    Manycores vs multicoresAaron Spink01/10/15 07:21 PM
                                                                      Manycores vs multicoresjuanrga01/10/15 08:25 PM
                                                                        Manycores vs multicoresAaron Spink01/10/15 09:11 PM
                                                                          Manycores vs multicoresJouni Osmala01/11/15 04:50 AM
                                                                            Manycores vs multicoresjuanrga01/11/15 08:58 AM
                                                                            Manycores vs multicorescoppice01/12/15 10:01 PM
                                                                              Manycores vs multicoresJouni Osmala01/13/15 04:38 AM
                                                                        Manycores vs multicoresanon01/11/15 03:19 AM
                                                                      Manycores vs multicoresMichael S01/11/15 05:44 AM
                                                                        Manycores vs multicoresAaron Spink01/11/15 05:55 PM
                                                                          Manycores vs multicoresMichael S01/12/15 04:41 AM
                                                                            Manycores vs multicoresEric Bron01/12/15 06:29 AM
                                                                              Manycores vs multicoresEric Bron01/12/15 06:30 AM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron01/03/15 02:54 PM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?juanrga01/07/15 05:48 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron01/07/15 07:41 AM
                                                              Manycores vs multicoresjuanrga01/10/15 04:14 PM
                                                    Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron01/03/15 02:42 PM
                                                      Why read RWT or Reddit when you can get journalists to do it for you?juanrga01/07/15 06:03 AM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron01/07/15 07:45 AM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Linus Torvalds01/08/15 03:09 PM
                                                          Pink unicorns for salejuanrga01/10/15 05:09 PM
                                                        Intentionally picking a competitors slow part is cheating ...Mark Roulo01/08/15 06:37 PM
                                                          Intentionally picking a competitors slow part is cheating ...coppice01/08/15 11:38 PM
                                                            Intentionally picking a competitors slow part is cheating ...Mark Roulo01/09/15 09:13 AM
                                                              Intentionally picking a competitors slow part is cheating ...Anon01/10/15 02:00 AM
                                                              Intentionally picking a competitors slow part is cheating ...David Hess01/11/15 01:03 PM
                                                            Intentionally picking a competitors slow part is cheating ...someone01/09/15 10:31 AM
                                                              Intentionally picking a competitors slow part is cheating ...coppice01/12/15 09:45 PM
                                                                Intentionally picking a competitors slow part is cheating ...coppice01/12/15 09:47 PM
                                                                  Intentionally picking a competitors slow part is cheating ...Michael S01/13/15 07:53 AM
                                                                    Intentionally picking a competitors slow part is cheating ...coppice01/13/15 09:44 AM
                                                                      Intentionally picking a competitors slow part is cheating ...Michael S01/13/15 10:01 AM
                                                                        Intentionally picking a competitors slow part is cheating ...coppice01/13/15 08:35 PM
                                                                      Core sizesjuanrga01/13/15 12:28 PM
                                                          NVIDIA'S FIRST CPU IS A WINNER (Linley Gwennap)juanrga01/10/15 04:34 PM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?Patrick Chase01/08/15 07:02 PM
                                                        Why read RWT or Reddit when you can get journalists to do it for you?coppice01/08/15 10:18 PM
                                                          Why read RWT or Reddit when you can get journalists to do it for you?Patrick Chase01/09/15 11:54 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Mark Roulo01/09/15 12:59 PM
                                                              Why read RWT or Reddit when you can get journalists to do it for you?Patrick Chase01/09/15 03:20 PM
                                                                Why read RWT or Reddit when you can get journalists to do it for you?Eric Bron01/09/15 03:30 PM
                                                            Alternatives to OOOE (again)juanrga01/10/15 04:50 PM
                                                              Alternatives to OOOE (again)David Kanter01/11/15 12:10 AM
                                                                Alternatives to OOOE (again)juanrga01/11/15 08:30 AM
                                                            Why read RWT or Reddit when you can get journalists to do it for you?Gabriele Svelto01/11/15 12:53 AM
                                              Why read RWT or Reddit when you can get journalists to do it for you?Fake Linus Torvalds01/03/15 12:14 PM
                                                Why read RWT or Reddit when you can get journalists to do it for you?Rob Thorpe01/03/15 08:25 PM
                                          Avoiding ping pongMaynard Handley12/09/14 11:33 AM
                                            Avoiding ping pongPatrick Chase12/09/14 01:54 PM
                                              Avoiding ping pongMaynard Handley12/09/14 06:56 PM
                                      Avoiding ping pongSalvatore De Dominicis12/09/14 08:51 AM
                                        Avoiding ping pongPatrick Chase12/09/14 02:00 PM
                                      Avoiding ping pongook12/11/14 03:31 AM
                                      Avoiding ping pongArt Scott12/19/14 10:19 PM
                                        Avoiding ping pongEric Bron nli12/20/14 04:05 AM
                                      What about specialization?Troll?01/02/15 07:55 AM
                                        What about specialization?Ungo01/04/15 03:27 PM
                                      Avoiding ping pongfewwef01/05/15 08:16 PM
                                      Avoiding ping pongV.Krishn01/08/15 06:11 AM
                                    Avoiding ping pongGabriele Svelto12/08/14 07:32 PM
                                    Avoiding ping ponganon12/08/14 11:37 PM
                            Avoiding ping pongKonrad Schwarz12/10/14 06:23 AM
                              Avoiding ping pongLinus Torvalds12/10/14 11:56 AM
                          Object reference lockingDavid W12/08/14 11:36 PM
                            Object reference lockingPatrick Chase12/09/14 04:52 PM
                              Object reference lockingDavid W12/11/14 05:18 AM
                    ISA != interface for "most programmers"Paul A. Clayton12/04/14 03:34 PM
                      ISA != interface for "most programmers"rwessel12/04/14 07:50 PM
                  Interesting! (exporting hot lines/cache-aware ISA); "Please sir, I want some more" (NT)Paul A. Clayton12/04/14 02:26 PM
                  Avoiding ping pongMichael S12/06/14 03:48 PM
          ARMv8 getting atomic operationsLinus Torvalds12/04/14 12:05 PM
            LL/SC idiom recognition is not admitting RMW superiorityPaul A. Clayton12/04/14 02:34 PM
            ARMv8 getting atomic operationsanon12/04/14 10:17 PM
    ARMv8 getting atomic operationsPatrick Chase12/03/14 12:09 PM
  limited ordernksingh12/04/14 10:17 PM
    I didn't understand this either. (NT)Konrad Schwarz12/04/14 10:32 PM
    limited orderdmcq12/05/14 02:13 AM
    limited orderbakaneko12/05/14 09:11 AM
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