Some 'reverse-engineering' of Zen

By: Gabriele Svelto (gabriele.svelto.delete@this.gmail.com), October 30, 2015 2:14 am
Room: Moderated Discussions
lurker (lurker9000.delete@this.realemail.mail) on October 30, 2015 2:39 am wrote:
> Personally I just hope the lack of 3rd AGU won't cause problems in SMT. I don't think
> normal workloads have that many operations that access memory, but SMT aims to maximize
> utilization of all available resources and only 2 AGUs might be a problem there.

I'm doubtful that lacking a 3rd AGU will make much difference in SMT-friendly loads. Those are usually either constrained by memory or branch misses leaving plenty of opportunities for the other thread to use the AGUs. The only scenario where this might be limiting if there's more than two threads but even there this doesn't seem to be a major problem: if you look at POWER8 the only realistic scenario in which it can make full use both its dual load and dual load-store pipes are carefully tuned vector kernels; and that's a processor which supports up to 8 threads per core!
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Some 'reverse-engineering' of Zenjuanrga2015/10/03 03:48 AM
  Some 'reverse-engineering' of ZenHeikki Kultala2015/10/03 07:01 AM
    Some 'reverse-engineering' of Zenitsmydamnation2015/10/03 02:47 PM
      Some 'reverse-engineering' of ZenAnders2015/10/03 10:04 PM
        Some 'reverse-engineering' of ZenContrarian2015/10/04 10:53 AM
          Some 'reverse-engineering' of ZenJukka Larja2015/10/05 08:15 AM
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              Some 'reverse-engineering' of ZenContrarian2015/10/25 11:25 AM
                Some 'reverse-engineering' of Zenitsmydamnation2015/10/26 12:49 AM
                Some 'reverse-engineering' of Zenjuanrga2015/10/29 01:16 AM
                  Some 'reverse-engineering' of Zenanon2015/10/30 05:54 AM
                    Some 'reverse-engineering' of Zenjuanrga2015/10/30 09:37 AM
                    POWER8 load/store unitsGabriele Svelto2015/10/30 05:34 PM
                Some 'reverse-engineering' of Zenlurker2015/10/29 02:12 PM
                  Some 'reverse-engineering' of ZenDavid Kanter2015/10/29 11:06 PM
                    Some 'reverse-engineering' of Zenlurker2015/10/30 01:39 AM
                      Some 'reverse-engineering' of ZenGabriele Svelto2015/10/30 02:14 AM
                        Some 'reverse-engineering' of Zenlurker2015/10/30 02:41 AM
                      Some 'reverse-engineering' of Zendmcq2015/10/30 04:12 AM
                        Some 'reverse-engineering' of Zenlurker2015/10/30 04:56 AM
                          Some 'reverse-engineering' of Zendmcq2015/10/30 05:09 AM
                            Some 'reverse-engineering' of Zennone2015/10/30 05:16 AM
                          Some 'reverse-engineering' of ZenDavid Kanter2015/10/30 07:16 AM
                            Some 'reverse-engineering' of Zenlurker2015/10/30 07:44 AM
                          Some 'reverse-engineering' of Zenjuanrga2015/10/30 12:00 PM
                            AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Heikki Kultala2015/10/30 02:45 PM
                              AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)juanrga2015/10/31 05:20 AM
                                AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Heikki Kultala2015/10/31 01:19 PM
                                  AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)juanrga2015/11/01 06:41 AM
                                    AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Anne O. Nymous2015/11/01 08:39 AM
                                AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)Matthias Waldhauer2015/11/02 12:26 PM
                                  AVX and 128-bit FPUs in Zen(Re:Some 'reverse-engineering' of Zen)juanrga2015/11/03 02:42 AM
                            Some 'reverse-engineering' of ZenMatthias Waldhauer2015/11/02 10:39 AM
                        Some 'reverse-engineering' of Zenbakaneko2015/10/31 06:28 AM
                          Some 'reverse-engineering' of Zendmcq2015/10/31 07:19 AM
                            Some 'reverse-engineering' of ZenJukka Larja2015/10/31 08:21 AM
                            Some 'reverse-engineering' of Zenbakaneko2015/10/31 09:23 AM
                              Some 'reverse-engineering' of Zendmcq2015/10/31 03:12 PM
                                Some 'reverse-engineering' of Zenbakaneko2015/10/31 04:25 PM
                                  Some 'reverse-engineering' of Zendmcq2015/11/01 06:36 AM
                                    Some 'reverse-engineering' of Zenbakaneko2015/11/01 09:11 AM
                                      Some 'reverse-engineering' of Zendmcq2015/11/01 09:27 AM
                                        Some 'reverse-engineering' of Zenbakaneko2015/11/01 02:35 PM
                                          Some 'reverse-engineering' of Zendmcq2015/11/01 03:52 PM
                                            Some 'reverse-engineering' of Zenbakaneko2015/11/03 02:17 AM
                                              Some 'reverse-engineering' of Zendmcq2015/11/03 03:17 AM
                  Some 'reverse-engineering' of Zenjuanrga2015/10/30 11:43 AM
                    Some 'reverse-engineering' of Zenlurker2015/10/30 01:09 PM
                      Some 'reverse-engineering' of Zenjuanrga2015/10/31 05:58 AM
                        Some 'reverse-engineering' of Zenlurker2015/10/31 07:07 AM
                          Some 'reverse-engineering' of Zenjuanrga2015/10/31 11:50 AM
                            Some 'reverse-engineering' of ZenPoindexter2015/10/31 01:47 PM
                              Some 'reverse-engineering' of Zenlurker2015/10/31 03:06 PM
                                Some 'reverse-engineering' of ZenPoindexter2015/10/31 04:37 PM
                                  Some 'reverse-engineering' of Zenlurker2015/11/01 02:46 AM
                                  Some 'reverse-engineering' of Zenjuanrga2015/11/01 07:16 AM
                                    Some 'reverse-engineering' of ZenMaynard Handley2015/11/01 05:33 PM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/02 04:06 AM
                                        Zen transistor countHeikki Kultala2015/11/04 12:30 AM
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                                    Some 'reverse-engineering' of ZenSymmetry2015/11/02 05:56 AM
                                      Some 'reverse-engineering' of ZenDavid Hess2015/11/02 06:16 AM
                                      Some 'reverse-engineering' of Zennobody2015/11/02 07:19 AM
                                        Some 'reverse-engineering' of ZenJukka Larja2015/11/02 08:34 PM
                                          Some 'reverse-engineering' of Zennobody2015/11/03 12:35 AM
                                            Some 'reverse-engineering' of ZenJukka Larja2015/11/03 01:41 AM
                                              Some 'reverse-engineering' of Zennobody2015/11/03 04:10 AM
                                                Some 'reverse-engineering' of ZenJukka Larja2015/11/04 01:52 AM
                                            Some 'reverse-engineering' of ZenKlimax2015/11/03 01:47 AM
                                              Some 'reverse-engineering' of Zennobody2015/11/03 03:19 AM
                                                Some 'reverse-engineering' of ZenKlimax2015/11/03 11:09 AM
                                          Some 'reverse-engineering' of ZenBanana_Comedown2015/11/04 10:17 AM
                                            Some 'reverse-engineering' of ZenJukka Larja2015/11/05 02:51 AM
                                              Some 'reverse-engineering' of ZenBanana_Comedown2015/11/05 12:23 PM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/03 03:13 AM
                                Some 'reverse-engineering' of Zennobody2015/10/31 07:16 PM
                                  Some 'reverse-engineering' of Zenlurker2015/11/01 02:48 AM
                                    Some 'reverse-engineering' of Zensylt2015/11/01 03:07 AM
                                    Some 'reverse-engineering' of Zennobody2015/11/01 10:49 AM
                                  Some 'reverse-engineering' of Zenmd2015/11/01 12:06 PM
                                    Some 'reverse-engineering' of Zenblu2015/11/01 12:59 PM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/02 04:10 AM
                              Some 'reverse-engineering' of Zenjuanrga2015/11/01 06:00 AM
                                Some 'reverse-engineering' of ZenPoindexter2015/11/01 08:25 AM
                                  Some 'reverse-engineering' of Zenjuanrga2015/11/02 03:47 AM
                                    Some 'reverse-engineering' of ZenPoindexter2015/11/02 04:39 AM
                                      Some 'reverse-engineering' of Zenjuanrga2015/11/02 12:26 PM
                                        Some 'reverse-engineering' of ZenDan Downs2015/11/02 02:12 PM
                                          Some 'reverse-engineering' of Zenjuanrga2015/11/03 02:51 AM
                            Some 'reverse-engineering' of Zenlurker2015/10/31 02:57 PM
                              Some 'reverse-engineering' of Zenjuanrga2015/11/01 06:26 AM
                                Some 'reverse-engineering' of ZenHeikki Kultala2015/11/01 08:57 AM
                                  Some 'reverse-engineering' of ZenMaynard Handley2015/11/01 05:39 PM
                              Some 'reverse-engineering' of ZenUngo2015/11/01 01:05 PM
                  Some 'reverse-engineering' of Zenquzhujian2015/10/31 09:39 AM
                  Some 'reverse-engineering' of ZenPoindexter2015/11/04 05:10 AM
                    Some 'reverse-engineering' of Zenlurker2015/11/05 12:54 PM
                      Some 'reverse-engineering' of Zennobody2015/11/05 02:28 PM
                      The sad status of tech mediajuanrga2015/11/06 04:19 AM
                        The sad status of tech mediaJoel2015/11/06 05:45 PM
                        The sad status of tech mediaMatthias Waldhauer2015/11/07 02:12 PM
                          The sad status of tech mediaJoel2015/11/07 04:40 PM
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