MEM : ALU ratio

Article: Knights Landing Details
By: Gabriele Svelto (gabriele.svelto.delete@this.gmail.com), January 11, 2014 3:47 am
Room: Moderated Discussions
Nicolas Capens (nicolas.capens.delete@this.gmail.com) on January 11, 2014 12:24 am wrote:
> And knowing how much an L1 access cost in power, that doesn't make sense unless they have
> 'something' to make it cheap for very locally reused data. I call that something an L0 cache.

This is an argument that really works against your thesis: memory accesses cost power, you suggest adding another dual-ported structure that needs to be wired to the L1, to the instruction fetch logic, reorder buffer, LSU and to the store-queue. That 'something' sits squarely in the middle of one of some of the most timing-critical paths in a processor and will be continuously burning power whether you use it or not. How do you possibly thing that's going to save power?

> The Intel compiler has been around for a long time, and AVX-512 is a very minor variation on KNC's
> 512-bit ISA extension.

Have you ever seen the output of the KNC compiler? I haven't and I'd be glad if someone would post it here.

> Also as someone pointed out elsewhere you need a somewhat representative
> compiler to generate traces that can be used during the design of the new architecture.

Very true however in my personal experience those compilers are never shared with the public.

> And lastly
> this behavior isn't coming from some complicated experimental optimization. This is part of basic
> register allocation and for decades the overall goal has been to minimize the number of memory operands.

That's just wrong: deciding what instructions to use happens during instruction selection, not register allocation, and in most compilers that happens *before* register allocation because the latter depends on the former (and it's also a highly compiler-dependent process). The two phases are not completely independent anyway as there's heuristics usually involved (to reduce register pressure, optimize for instruction decoding, etc...). On a new target those heuristics can easily yield wrong results resulting in poor code. Note that the heuristics driving instruction selection are not generic and usually depend on the machine description, so a very mature compiler with a brand new immature MD for a new core can still spit out some terrible code.

> To suddenly see that basic rule reversed cannot possibly be something Intel has overlooked.

Bugs happen and do so far more often than weird, never-seen-before microarchitectural changes appearing.

> There's a difference between it being the wrong solution and two L1 read ports being the right
> solution. The L0 cache is just one way Intel might avoid a 40% increase in power consumption,
> but the most likely one I've been able to come up with so far based on the compiler output.
> That you think that output is "probably" the result of an immature compiler, which it clearly
> isn't, is a much more interesting expression of doubt. So what's your other explanation?

The more this debate evolves and the more I'm keen on Michael S' thesis that there's really only one vector unit and L/S pipeline per core and there's twice as many cores as everybody expects.
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TopicPosted ByDate
Knights Landing details (new article)David Kanter2014/01/03 12:58 AM
  eDRAM as cacheiz2014/01/03 04:39 AM
    eDRAM optionsEric Bron2014/01/09 03:45 AM
  Knights Landing details (new article)Emil Briggs2014/01/03 06:06 AM
  Knights Landing details (new article)Michael S2014/01/03 07:05 AM
    PCI-E and QPIDavid Kanter2014/01/03 12:11 PM
  eDRAM still seems too expensive ...Mark Roulo2014/01/03 10:48 AM
    Nevermind ... I see that you addressed this :-)Mark Roulo2014/01/03 10:51 AM
    eDRAM still seems too expensive ...Eric Bron2014/01/03 01:42 PM
  eDRAM or stacked DRAM?Patrick Chase2014/01/03 11:21 AM
    eDRAM or stacked DRAM?Wes Felter2014/01/03 03:00 PM
      eDRAM or stacked DRAM?Patrick Chase2014/01/03 07:26 PM
        eDRAM or stacked DRAM?tarlinian2014/06/23 09:59 PM
          eDRAM or stacked DRAM?Maynard Handley2014/06/24 01:47 AM
            eDRAM or stacked DRAM?Michael S2014/06/24 03:13 AM
            eDRAM or stacked DRAM?David Kanter2014/06/24 12:09 PM
              eDRAM or stacked DRAM?anon2014/06/24 07:50 PM
                eDRAM or stacked DRAM?Eric Bron2014/06/24 10:02 PM
                  eDRAM or stacked DRAM?anon2014/06/24 10:39 PM
                eDRAM or stacked DRAM?Michael S2014/06/25 01:46 AM
              eDRAM or stacked DRAM?Michael S2014/06/25 01:29 AM
          eDRAM or stacked DRAM?Eric Bron2014/06/24 05:37 AM
            eDRAM or stacked DRAM?tarlinian2014/06/24 08:53 AM
              eDRAM or stacked DRAM?Eric Bron2014/06/24 09:09 AM
                eDRAM or stacked DRAM?tarlinian2014/06/24 09:40 AM
                  eDRAM or stacked DRAM?Eric Bron2014/06/24 10:10 AM
                    eDRAM or stacked DRAM?Eric Bron2014/06/24 10:12 AM
          eDRAM or stacked DRAM?Wes Felter2014/06/24 10:09 PM
            eDRAM or stacked DRAM?Michael S2014/06/25 02:02 AM
  Why not tag-inclusive L3?Paul A. Clayton2014/01/03 04:28 PM
    Why not tag-inclusive L3?Eric Bron2014/01/04 03:22 AM
  Knights Landing L/S bandwidthNicolas Capens2014/01/04 05:43 AM
    Knights Landing L/S bandwidthEric Bron2014/01/04 06:20 AM
      Knights Landing L/S bandwidthNicolas Capens2014/01/04 02:55 PM
        Knights Landing L/S bandwidthEric Bron2014/01/04 03:27 PM
          Knights Landing L/S bandwidthhobold2014/01/04 04:23 PM
            Knights Landing L/S bandwidthEric Bron2014/01/04 05:20 PM
              Knights Landing L/S bandwidthMichael S2014/01/05 03:42 AM
                Knights Landing L/S bandwidthEric Bron2014/01/05 03:49 AM
                  Knights Landing L/S bandwidthPatrick Chase2014/01/11 08:13 PM
                    Knights Landing L/S bandwidthNicolas Capens2014/01/13 08:39 PM
                Knights Landing L/S bandwidthNicolas Capens2014/01/05 03:18 PM
                  Knights Landing L/S bandwidthMichael S2014/01/06 04:09 AM
                    Knights Landing L/S bandwidthEric Bron2014/01/06 05:11 AM
                      Knights Landing L/S bandwidthMichael S2014/01/06 05:40 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/06 05:54 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/08 09:00 AM
                    Knights Landing L/S bandwidthNicolas Capens2014/01/07 03:31 PM
                      Knights Landing L/S bandwidthMichael S2014/01/07 04:17 PM
                        Knights Landing L/S bandwidthNicolas Capens2014/01/07 09:55 PM
                          Knights Landing L/S bandwidthMichael S2014/01/08 01:42 AM
                            Knights Landing L/S bandwidthGabriele Svelto2014/01/08 08:30 AM
                              Occam's razorNicolas Capens2014/01/08 02:33 PM
                                Occam's razorGabriele Svelto2014/01/08 02:51 PM
                                  Occam's razorEric Bron2014/01/08 03:28 PM
                                    Occam's razorbakaneko2014/01/09 04:45 AM
                                      Occam's razoranon2014/01/09 05:02 AM
                                        Occam's razorbakaneko2014/01/09 06:24 AM
                                          Occam's razorbakaneko2014/01/09 06:51 AM
                                            Occam's razoranon2014/01/09 07:18 AM
                                          Occam's razoranon2014/01/09 07:16 AM
                                            Occam's razorbakaneko2014/01/09 08:43 AM
                                              Occam's razoranon2014/01/09 09:17 AM
                                                Occam's razorbakaneko2014/01/09 11:12 AM
                                                  Occam's razorEric Bron2014/01/09 11:18 AM
                                                    Occam's razorbakaneko2014/01/09 11:58 AM
                                                  Occam's razoranon2014/01/09 12:35 PM
                                                    Occam's razorbakaneko2014/01/12 10:48 AM
                                                  99.9% not a new extensionNicolas Capens2014/01/10 11:39 AM
                                                    Compiler complexityGabriele Svelto2014/01/11 03:58 AM
                                                      Compiler complexityNicolas Capens2014/01/11 01:20 PM
                                                        Compiler complexityGabriele Svelto2014/01/11 03:17 PM
                                                          Patent pendingNicolas Capens2014/01/14 07:21 PM
                                                    99.9% not a new extensionbakaneko2014/01/12 11:08 AM
                                  L0 data cacheEric Bron2014/01/08 04:52 PM
                                  Occam's razorDavid Kanter2014/01/08 04:53 PM
                                    Occam's razorNicolas Capens2014/01/09 03:07 AM
                                      Occam's razorRicardo B2014/01/09 05:21 AM
                                        Virtually indexed, untaggedNicolas Capens2014/01/10 11:27 AM
                                          Virtually indexed, untaggedGabriele Svelto2014/01/11 04:08 AM
                                            Virtually indexed, untaggedNicolas Capens2014/01/11 09:45 PM
                                              Virtually indexed, untaggedDavid Kanter2014/01/12 02:13 AM
                                                Virtually indexed, untaggedanon2014/01/12 04:02 AM
                                                Virtually indexed, untaggedNicolas Capens2014/01/16 09:55 AM
                                              Virtually indexed, untaggedMichael S2014/01/12 04:09 AM
                                                Virtually indexed, untaggedNicolas Capens2014/01/16 10:47 AM
                                      Occam's razorDavid Kanter2014/01/09 06:42 PM
                                        Occam's razorNicolas Capens2014/01/10 02:22 PM
                                          Occam's razorDavid Kanter2014/01/10 04:06 PM
                                            MEM : ALU ratioNicolas Capens2014/01/11 12:24 AM
                                              MEM : ALU ratioGabriele Svelto2014/01/11 03:47 AM
                                                MEM : ALU ratioEric Bron2014/01/11 04:41 AM
                                                  MEM : ALU ratioEric Bron2014/01/11 05:06 AM
                                                    MEM : ALU ratioDavid Kanter2014/01/11 08:28 PM
                                                      MEM : ALU ratioEric Bron nli2014/01/12 02:54 AM
                                                  MEM : ALU ratioGabriele Svelto2014/01/11 10:15 AM
                                                MEM : ALU ratioNicolas Capens2014/01/14 06:56 PM
                                                  Etiquette in linking to papersPaul A. Clayton2014/01/14 07:44 PM
                                                  MEM : ALU ratioanon2014/01/14 08:32 PM
                                                    L0 power costNicolas Capens2014/01/16 02:05 PM
                                                      L0 power costanon2014/01/16 10:01 PM
                                                        L0 power costNicolas Capens2014/01/19 12:30 AM
                                                          Links revealedPaul A. Clayton2014/01/19 04:47 PM
                                                          L0 power costanon2014/01/20 01:19 AM
                                                            L0 power costNicolas Capens2014/01/20 02:49 PM
                                                              L0 power costanon2014/01/21 01:18 AM
                                                                Q.E.D.Nicolas Capens2014/01/21 08:44 PM
                                                                  Q.E.D.anon2014/01/21 09:24 PM
                                                                    Straw manNicolas Capens2014/01/23 11:56 PM
                                                                      Straw mananon2014/01/25 06:46 AM
                                                                        Still waiting for an explanationNicolas Capens2014/01/26 12:19 AM
                                                                          Still waiting for an explanationExophase2014/01/26 01:13 PM
                                                                            Still waiting for an explanationbakaneko2014/01/26 11:52 PM
                                                                  Q.E.D.Ricardo B2014/01/22 06:58 PM
                                                                    Q.E.D.Michael S2014/01/23 04:59 AM
                                                                      L0 entry countNicolas Capens2014/01/24 01:11 AM
                                                                        L0 entry countEric Bron2014/01/24 02:08 AM
                                                                          L0 entry countMichael S2014/01/24 06:18 AM
                                                                            L0 entry countEric Bron2014/01/24 07:15 AM
                                                                              L0 entry countMichael S2014/01/24 08:10 AM
                                                                                L0 entry countEric Bron2014/01/24 08:20 AM
                                                                          L0 entry countNicolas Capens2014/01/24 02:33 PM
                                                                            L0 entry countEric Bron2014/01/24 03:20 PM
                                                                              L0 entry count and L1 read port orthogonalityNicolas Capens2014/01/26 01:14 AM
                                                                                L0 entry count and L1 read port orthogonalityEric Bron2014/01/26 03:49 AM
                                                                    L0 hit rateNicolas Capens2014/01/24 12:49 AM
                                                                      L0 hit rateRicardo B2014/01/24 06:42 AM
                                                                        L0 hit rateExophase2014/01/24 01:37 PM
                                                                          L0 hit rateEric Bron2014/01/24 02:12 PM
                                                                        L0 vs RF powerNicolas Capens2014/01/24 02:43 PM
                                              MEM : ALU ratioDavid Kanter2014/01/11 01:47 PM
                                                MEM : ALU ratioNicolas Capens2014/01/16 09:23 AM
                                                  MEM : ALU ratioStubabe2014/01/17 12:58 PM
                                                    MEM : ALU ratioStubabe2014/01/17 01:42 PM
                                                      MEM : ALU ratioMichael S2014/01/18 04:57 PM
                                                        MEM : ALU ratiobakaneko2014/01/19 12:47 AM
                                                    MEM : ALU ratioNicolas Capens2014/01/20 03:48 PM
                                                      It's called "tunnel vision" (NT)iz2014/01/20 04:36 PM
                                                      MEM : ALU ratioMichael S2014/01/20 04:37 PM
                                                        MEM : ALU ratioStubabe2014/01/21 04:54 PM
                                                        MEM : ALU ratioNicolas Capens2014/01/21 10:07 PM
                                                          MEM : ALU ratioMichael S2014/01/22 08:17 AM
                                                            MEM : ALU ratioNicolas Capens2014/01/24 03:33 PM
                                                      MEM : ALU ratioStubabe2014/01/21 04:32 PM
                                                        MEM : ALU ratioMichael S2014/01/22 08:56 AM
                                                          MEM : ALU ratioStubabe2014/01/23 09:06 AM
                                                            MEM : ALU ratioEric Bron2014/01/23 09:45 AM
                                                              editEric Bron2014/01/23 09:49 AM
                                                            MEM : ALU ratioMichael S2014/01/23 09:58 AM
                                                              MEM : ALU ratioEric Bron2014/01/23 10:29 AM
                                                                MEM : ALU ratioMichael S2014/01/23 10:33 AM
                                                              MEM : ALU ratioStubabe2014/01/24 04:50 AM
                                                MEM : ALU ratiobakaneko2014/01/23 10:36 AM
                                              MEM : ALU ratioNoSpammer2014/01/11 03:39 PM
                                                L1 vs L0 access costNicolas Capens2014/01/16 03:17 PM
                                                  L1 vs L0 access costNoSpammer2014/01/19 01:48 PM
                                                    L1 vs L0 access costdmcq2014/01/22 05:45 AM
                                                      L1 vs L0 access costGabriele Svelto2014/01/22 07:29 AM
                                                        L1 vs L0 access costdmcq2014/01/22 01:33 PM
                                                          L1 vs L0 access costGabriele Svelto2014/01/22 04:33 PM
                                                            L1 vs L0 access costdmcq2014/01/24 04:19 AM
                                                    L1 vs L0 access costNicolas Capens2014/01/24 02:16 AM
                                      Occam's razorPatrick Chase2014/01/13 11:19 AM
                                  Occam's razorNicolas Capens2014/01/09 12:40 AM
                                    Occam's razorGabriele Svelto2014/01/09 02:41 AM
                                      Occam's razorEric Bron2014/01/09 02:54 AM
                                        Occam's razorGabriele Svelto2014/01/09 06:35 AM
                                          Occam's razorEric Bron2014/01/09 07:14 AM
                                            avoiding redundant loadsEric Bron2014/01/09 07:18 AM
                                            AVX2 versionEric Bron2014/01/09 07:32 AM
                                      Occam's razorAmiba Gelos2014/01/09 03:01 AM
                                        Occam's razorEric Bron2014/01/09 03:06 AM
                                          Occam's razorAmiba Gelos2014/01/09 03:43 AM
                                            Occam's razorEric Bron2014/01/09 04:02 AM
                                        L0 access latencyNicolas Capens2014/01/09 04:27 AM
                                          L0 access latencyAmiba Gelos2014/01/09 05:16 AM
                                            compared to L0$ i would say banking is far more likely (NT)Amiba Gelos2014/01/09 05:20 AM
                                            L0 access latencyNicolas Capens2014/01/10 03:20 PM
                                      Occam's razorNicolas Capens2014/01/09 04:19 AM
                                    Occam's razorNoSpammer2014/01/09 12:55 PM
                                      Occam's razorNicolas Capens2014/01/10 03:40 PM
                                        Occam's razorMichael S2014/01/11 10:21 AM
                                        Occam's razorMichael S2014/01/12 03:21 PM
                                          KNC compiler outputNicolas Capens2014/01/16 06:39 PM
                                            KNC compiler outputMichael S2014/01/18 05:13 PM
                                    L0 cache coherencyDavid Kanter2014/01/11 08:39 PM
                                Occam's razoranon2014/01/09 05:12 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/08 10:46 AM
                              Knights Landing L/S bandwidthMichael S2014/01/08 11:23 AM
                            Knights Landing L/S bandwidthNicolas Capens2014/01/08 02:02 PM
                              Knights Landing L/S bandwidthMichael S2014/01/08 02:29 PM
                                Knights Landing L/S bandwidthEric Bron2014/01/08 02:54 PM
                                  Knights Landing L/S bandwidthMichael S2014/01/08 03:00 PM
                                    Knights Landing L/S bandwidthEric Bron2014/01/08 03:13 PM
                                      Knights Landing L/S bandwidthMichael S2014/01/08 03:28 PM
                                        Knights Landing L/S bandwidthEric Bron2014/01/08 03:32 PM
                                          Knights Landing L/S bandwidthMichael S2014/01/08 03:40 PM
                                            Knights Landing L/S bandwidthEric Bron2014/01/08 03:51 PM
                                              Knights Landing L/S bandwidthMichael S2014/01/09 12:18 PM
                          Knights Landing L/S bandwidthPatrick Chase2014/01/12 10:03 PM
                            Also page/line splits?David Kanter2014/01/12 10:50 PM
                              Also page/line splits?anon2014/01/13 01:44 AM
                                Also page/line splits?none2014/01/13 03:09 AM
                                  Also page/line splits?anon2014/01/13 04:19 AM
                            Knights Landing L/S bandwidthExophase2014/01/13 12:15 AM
                            Knights Landing L/S bandwidthanon2014/01/13 01:41 AM
                              Knights Landing L/S bandwidthPatrick Chase2014/01/13 11:14 AM
                            Aliased writesNicolas Capens2014/01/14 09:46 PM
                      Knights Landing L/S bandwidthRicardo B2014/01/07 04:27 PM
                        Knights Landing L/S bandwidthNicolas Capens2014/01/07 10:28 PM
                          Knights Landing L/S bandwidthRicardo B2014/01/08 02:13 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/08 11:10 AM
                            Knights Landing L/S bandwidthNicolas Capens2014/01/08 03:31 PM
                              Knights Landing L/S bandwidthRicardo B2014/01/08 03:58 PM
                                Knights Landing L/S bandwidthG. Gouvine2014/01/09 09:10 AM
                                  Knights Landing L/S bandwidthRicardo B2014/01/09 11:19 AM
                                    Efficient load queue vs. efficient L0 cacheNicolas Capens2014/01/11 12:28 PM
                                      Efficient load queue vs. efficient L0 cacheG. Gouvine2014/01/13 02:11 AM
                                        Efficient load queue vs. efficient L0 cacheMichael S2014/01/13 03:43 AM
                                Register file read port requirementsNicolas Capens2014/01/11 12:55 AM
                                  Register file read port requirementsRicardo B2014/01/11 05:24 AM
                                    Register file read port requirementsEric Bron2014/01/11 05:32 AM
                                      Register file read port requirementsMichael S2014/01/11 09:57 AM
                                        Register file read port requirementsEric Bron2014/01/11 11:16 AM
                                          Register file read port requirementsMichael S2014/01/11 11:46 AM
                                            Register file read port requirementsEric Bron2014/01/11 12:12 PM
                                              Register file read port requirementsMichael S2014/01/11 12:36 PM
                                                Register file read port requirementsEric Bron2014/01/11 12:51 PM
                                              Register file read port requirementsPatrick Chase2014/01/13 02:27 PM
                                                Register file read port requirementsEric Bron2014/01/13 04:24 PM
                                                  Register file read port requirementsPatrick Chase2014/01/13 06:02 PM
                                                    Register file read port requirementsEric Bron2014/01/14 04:50 AM
                                                      Register file read port requirementsMichael S2014/01/14 11:36 AM
                                                        Register file read port requirementsEric Bron nli2014/01/14 01:04 PM
                                            Register file read port requirementsPatrick Chase2014/01/13 02:17 PM
                                              Register file read port requirementsMichael S2014/01/15 04:27 AM
                                        Register file read port requirementsEric Bron2014/01/11 11:28 AM
                                          Register file read port requirementsMichael S2014/01/11 12:07 PM
                                            Register file read port requirementsPatrick Chase2014/01/13 02:40 PM
                                          Register file read port requirementsPatrick Chase2014/01/13 02:34 PM
                                      Register file read port requirementsRicardo B2014/01/11 12:55 PM
                                        Register file read port requirementsEric Bron2014/01/11 01:17 PM
                                          Register file read port requirementsRicardo B2014/01/11 02:36 PM
                                            Register file read port requirementsEric Bron2014/01/11 02:42 PM
                                              Register file read port requirementsRicardo B2014/01/11 03:20 PM
                                                Register file read port requirementsEric Bron2014/01/11 03:26 PM
                                                  Register file read port requirementsMichael S2014/01/11 04:07 PM
                                                    Register file read port requirementsRicardo B2014/01/11 04:38 PM
                                                      Register file read port requirementsMichael S2014/01/11 04:49 PM
                                                Register file read port requirementsEric Bron2014/01/11 03:39 PM
                                                  Register file read port requirementsEric Bron2014/01/11 03:41 PM
                                                  Register file read port requirementsRicardo B2014/01/11 04:30 PM
                                    Register file read port requirementsNicolas Capens2014/01/11 12:09 PM
              Knights Landing L/S bandwidthanon2014/01/05 06:55 AM
                Knights Landing L/S bandwidthEric Bron2014/01/05 07:30 AM
                  Knights Landing L/S bandwidthanon2014/01/06 01:07 AM
                    Knights Landing L/S bandwidthEric Bron2014/01/06 02:38 AM
                      Knights Landing L/S bandwidthanon2014/01/06 04:01 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/06 04:44 AM
                          Knights Landing L/S bandwidthanon2014/01/06 05:39 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/06 06:00 AM
                              Knights Landing L/S bandwidthanon2014/01/06 06:44 AM
                                Knights Landing L/S bandwidthMichael S2014/01/06 08:54 AM
                                  Knights Landing L/S bandwidthEric Bron2014/01/06 10:11 AM
                                    Knights Landing L/S bandwidthMichael S2014/01/06 10:14 AM
                                      Knights Landing L/S bandwidthEric Bron2014/01/06 11:37 AM
                                        Knights Landing L/S bandwidthRicardo B2014/01/08 06:25 AM
                                          Knights Landing L/S bandwidthEric Bron2014/01/08 08:36 AM
                                            Knights Landing L/S bandwidthEric Bron2014/01/08 08:41 AM
                                            KNC code generator with EVEX back-end?Michael S2014/01/08 09:43 AM
                                              KNC code generator with EVEX back-end?Exophase2014/01/08 10:00 AM
                                                KNC code generator with EVEX back-end?Ricardo B2014/01/08 11:39 AM
                                                  KNC code generator with EVEX back-end?Eric Bron2014/01/08 12:15 PM
                                                    KNC code generator with EVEX back-end?Exophase2014/01/08 01:17 PM
                                                      KNC code generator with EVEX back-end?Ricardo B2014/01/08 02:06 PM
                                                        KNC code generator with EVEX back-end?Exophase2014/01/08 02:24 PM
                                                        KNC code generator with EVEX back-end?Eric Bron2014/01/08 02:38 PM
                                                    KNC code generator with EVEX back-end?Michael S2014/01/08 01:54 PM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 10:25 AM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 10:35 AM
                                                KNC code generator with EVEX back-end?Michael S2014/01/08 11:07 AM
                                                  KNC code generator with EVEX back-end?Eric Bron2014/01/08 11:24 AM
                                                    KNC code generator with EVEX back-end?Michael S2014/01/08 11:43 AM
                                                      KNC code generator with EVEX back-end?Eric Bron2014/01/08 01:23 PM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 10:43 AM
                                          AVX2 code much different than AVX-512Eric Bron2014/01/08 08:52 AM
                                            evil questionhobold2014/01/08 10:22 AM
                                              evil questionEric Bron2014/01/08 10:27 AM
                                                evil questionhobold2014/01/08 02:33 PM
                                                  evil questionMichael S2014/01/08 02:37 PM
                                                    stupid question (was: evil question)hobold2014/01/09 05:41 AM
                                                      stupid question (was: evil question)Eric Bron2014/01/09 05:52 AM
                                                        stupid question (was: evil question)Michael S2014/01/09 08:00 AM
                                                          stupid question (was: evil question)Michael S2014/01/09 08:12 AM
                                                            stupid question (was: evil question)Eric Bron2014/01/09 10:47 AM
                                                              stupid question (was: evil question)Michael S2014/01/09 11:48 AM
                                                                more decisive (hopefully) test caseMichael S2014/01/09 12:01 PM
                                                                  more decisive (hopefully) test caseEric Bron2014/01/09 12:08 PM
                                                                    more decisive (hopefully) test caseMichael S2014/01/09 12:24 PM
                                                                      more decisive (hopefully) test caseEric Bron2014/01/09 12:27 PM
                                                                        more decisive (hopefully) test caseMichael S2014/01/09 12:33 PM
                                                                  AVX2Eric Bron2014/01/09 12:14 PM
                                                                    AVX2Michael S2014/01/09 12:30 PM
                                                                      AVX2Eric Bron2014/01/09 12:40 PM
                                                                  another tryMichael S2014/01/09 03:02 PM
                                                                    another tryEric Bron2014/01/09 03:33 PM
                                                                      another tryMichael S2014/01/09 04:20 PM
                                                                      another try - ignore misformated mess aboveMichael S2014/01/09 04:24 PM
                                                                        another try - ignore misformated mess aboveGabriele Svelto2014/01/10 01:01 AM
                                                                          another try - ignore misformated mess aboveEric Bron2014/01/10 03:05 AM
                                                                            another try - ignore misformated mess aboveMichael S2014/01/11 10:23 AM
                                                                              another try - ignore misformated mess aboveEric Bron2014/01/11 11:08 AM
                                                                                another try - ignore misformated mess aboveMichael S2014/01/11 12:09 PM
                                                                                  another try - ignore misformated mess aboveMichael S2014/01/11 12:12 PM
                                                                                    another try - ignore misformated mess aboveEric Bron2014/01/11 12:24 PM
                                                                                      another try - ignore misformated mess aboveMichael S2014/01/11 01:24 PM
                                                                                        another try - ignore misformated mess aboveEric Bron2014/01/11 02:11 PM
                                                                                          another try - ignore misformated mess aboveMichael S2014/01/11 02:18 PM
                                                                                            another try - ignore misformated mess aboveEric Bron2014/01/11 02:27 PM
                                                                                              another try - ignore misformated mess aboveMichael S2014/01/11 02:29 PM
                                                                                                another try - ignore misformated mess aboveEric Bron2014/01/11 02:46 PM
                                                                                                  another try - ignore misformated mess aboveEric Bron2014/01/11 02:46 PM
                                                                                                  another try - ignore misformated mess aboveMichael S2014/01/11 03:28 PM
                                                                                        another try - ignore misformated mess aboveEric Bron2014/01/11 02:17 PM
                                                                                          another try - ignore misformated mess aboveMichael S2014/01/11 02:24 PM
                                                                    KNC versionMichael S2014/01/11 05:19 PM
                                                                      KNC versionEric Bron nli2014/01/12 02:59 AM
                                                                        KNC versionGabriele Svelto2014/01/12 09:06 AM
                                                  evil questionEric Bron2014/01/08 02:41 PM
              Knights Landing L/S bandwidthPatrick Chase2014/01/05 11:20 PM
                Knights Landing L/S bandwidthEric Bron2014/01/06 02:45 AM
                  Knights Landing L/S bandwidthanon2014/01/06 04:12 AM
                    Knights Landing L/S bandwidthMichael S2014/01/06 04:17 AM
                      Knights Landing L/S bandwidthanon2014/01/06 05:20 AM
          Knights Landing L/S bandwidthNicolas Capens2014/01/04 05:34 PM
            Knights Landing L/S bandwidthEric Bron2014/01/04 05:44 PM
              Knights Landing L/S bandwidthNicolas Capens2014/01/05 12:25 PM
                Knights Landing L/S bandwidthEric Bron2014/01/05 01:50 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/05 03:34 PM
                    Might even help with gatherNicolas Capens2014/01/05 03:40 PM
                      What is an L0 cache?David Kanter2014/01/05 10:44 PM
                        What is an L0 cache?anon2014/01/06 05:57 AM
                          What is an L0 cache?Nicolas Capens2014/01/06 12:57 PM
                            What is an L0 cache?anon2014/01/06 02:18 PM
    Knights Landing L/S bandwidthDavid Kanter2014/01/04 10:58 AM
      Knights Landing L/S bandwidthNicolas Capens2014/01/04 04:24 PM
        Knights Landing L/S bandwidthEric Bron2014/01/04 04:46 PM
          Knights Landing L/S bandwidthKonrad Schwarz2014/01/08 12:48 AM
            Knights Landing L/S bandwidthMichael S2014/01/08 02:45 AM
        Knights Landing L/S bandwidthDavid Kanter2014/01/05 01:44 AM
          Knights Landing L/S bandwidthEric Bron2014/01/05 03:55 AM
          Knights Landing L/S bandwidthNicolas Capens2014/01/05 12:18 PM
            Knights Landing L/S bandwidthMaynard Handley2014/01/05 11:33 PM
              Knights Landing L/S bandwidthEric Bron2014/01/06 04:02 AM
                Knights Landing L/S bandwidthMichael S2014/01/06 04:23 AM
                  Knights Landing L/S bandwidthEric Bron2014/01/06 04:35 AM
                    Knights Landing L/S bandwidthMichael S2014/01/06 05:20 AM
                      Knights Landing L/S bandwidthMichael S2014/01/06 05:32 AM
                      Knights Landing L/S bandwidthEric Bron2014/01/06 05:36 AM
                        Knights Landing L/S bandwidthMichael S2014/01/06 06:00 AM
                          Knights Landing L/S bandwidthEric Bron2014/01/06 06:07 AM
                          Knights Landing L/S bandwidthEric Bron2014/01/06 06:14 AM
                            editsEric Bron2014/01/06 06:22 AM
                              optimized versionEric Bron2014/01/06 06:35 AM
                                yet more optimized versionEric Bron2014/01/06 06:42 AM
                                  latest version for todayEric Bron2014/01/06 06:51 AM
                                    Probably just L2 bandwith limitedNicolas Capens2014/01/06 11:48 AM
                                  yet more optimized versionMaynard Handley2014/01/06 06:54 PM
                                optimized versionMaynard Handley2014/01/06 06:52 PM
                                  optimized versionMichael S2014/01/07 10:42 AM
                                    optimized versionNicolas Capens2014/01/07 12:36 PM
                                      optimized versionMichael S2014/01/07 03:41 PM
                                        optimized versionNicolas Capens2014/01/07 10:52 PM
                                          optimized versionMichael S2014/01/08 02:10 AM
                                    optimized versionEric Bron2014/01/07 02:34 PM
                                      optimized versionMichael S2014/01/07 03:18 PM
                                        optimized versionEric Bron2014/01/07 03:30 PM
                                          optimized versionEric Bron2014/01/07 03:33 PM
                                            optimized versionMichael S2014/01/07 03:57 PM
                                    optimized versionMaynard Handley2014/01/07 06:50 PM
                                      optimized versionMichael S2014/01/08 02:39 AM
                Knights Landing L/S bandwidthMaynard Handley2014/01/06 06:47 PM
              Knights Landing L/S bandwidthNicolas Capens2014/01/06 09:18 AM
                Knights Landing L/S bandwidthMaynard Handley2014/01/06 06:56 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/07 12:18 PM
        Knights Landing L/S bandwidthNoSpammer2014/01/05 01:15 PM
          Knights Landing L/S bandwidthNicolas Capens2014/01/05 03:06 PM
            Knights Landing L/S bandwidthNoSpammer2014/01/06 04:20 AM
              Knights Landing L/S bandwidthNicolas Capens2014/01/06 11:54 AM
                Knights Landing L/S bandwidthNoSpammer2014/01/06 01:24 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/06 09:15 PM
                    Knights Landing L/S bandwidthNoSpammer2014/01/07 03:58 AM
                      Knights Landing L/S bandwidthNicolas Capens2014/01/07 03:18 PM
                        Knights Landing L/S bandwidthNoSpammer2014/01/08 01:38 PM
                          Knights Landing L/S bandwidthNicolas Capens2014/01/08 11:14 PM
  AVX512F questionMichael S2014/01/06 10:18 AM
    AVX512F questionNicolas Capens2014/01/06 12:01 PM
  Knights Landing - time for obituary?Michael S2018/07/31 03:00 PM
    Knights Landing - time for obituary?Adrian2018/07/31 09:24 PM
      Knights Landing - time for obituary?SoftwareEngineer2018/08/01 02:15 AM
        auto-vectorization is a dead endMichael S2018/08/01 03:48 AM
          Auto-vectorization of random C is a dead endMark Roulo2018/08/01 11:07 AM
            Auto-vectorization of random C is a dead endPassing Through2018/08/01 01:35 PM
              Auto-vectorization of random C is a dead endDavid Kanter2018/08/01 10:44 PM
                Auto-vectorization of random C is a dead endPassing Through2018/08/02 01:51 AM
            Auto-vectorization of random C is a dead endSoftwareEngineer2018/08/02 01:19 AM
              Auto-vectorization of random C is a dead endMark Roulo2018/08/02 09:50 AM
                Auto-vectorization of random C is a dead endMichael S2018/08/02 12:11 PM
                  Auto-vectorization of random C is a dead endj2018/08/02 11:37 PM
                    Auto-vectorization of random C is a dead endMichael S2018/08/03 03:50 AM
                      Auto-vectorization of random C is a dead endrwessel2018/08/03 11:06 PM
                  Auto-vectorization of random C is a dead endRicardo B2018/08/03 04:20 AM
                    Auto-vectorization of random C is a dead endMichael S2018/08/03 05:37 AM
                      Auto-vectorization of random C is a dead endRicardo B2018/08/03 11:22 AM
            Auto-vectorization of random C is a dead endTravis2018/08/03 07:58 PM
              Potential way to autovectorization in the future. Jouni Osmala2018/08/03 10:22 PM
                Potential way to autovectorization in the future. Jukka Larja2018/08/04 04:03 AM
                  Potential way to autovectorization in the future. Passing Through2018/08/04 06:47 AM
                Potential way to autovectorization in the future. Travis2018/08/04 01:50 PM
                  Potential way to autovectorization in the future. Michael S2018/08/04 02:33 PM
                    Potential way to autovectorization in the future. Travis2018/08/04 02:48 PM
                    Potential way to autovectorization in the future. Passing Through2018/08/04 02:58 PM
                  Skylake server/client AVX PRF speculationJeff S.2018/08/04 05:42 PM
                    Skylake server/client AVX PRF speculationanonymou52018/08/04 06:21 PM
                      Skylake server/client AVX PRF speculationJeff S.2018/08/04 06:38 PM
                        Skylake server/client AVX PRF speculationanonymou52018/08/04 07:45 PM
                          Skylake server/client AVX PRF speculationJeff S.2018/08/04 08:08 PM
                            Skylake server/client AVX PRF speculationanonymou52018/08/04 08:18 PM
                              Skylake server/client AVX PRF speculationNomad2018/08/05 11:10 PM
                                Skylake server/client AVX PRF speculationanonymou52018/08/06 12:14 PM
                                Skylake server/client AVX PRF speculationTravis2018/08/06 08:43 PM
                            Skylake server/client AVX PRF speculationTravis2018/08/06 08:39 PM
              Auto-vectorization of random C is a dead endBrett2018/08/04 01:55 PM
                Auto-vectorization of random C is a dead endTravis2018/08/04 02:38 PM
                  Auto-vectorization of random C is a dead endPassing Through2018/08/04 03:00 PM
                    New record for shortest post by Ireland - AI crashed? (NT)Travis2018/08/04 03:34 PM
                      New record for shortest post by Ireland - AI crashed?Passing Through2018/08/04 04:12 PM
                        New record for shortest post by Ireland - AI crashed?anonymou52018/08/04 06:00 PM
                          New record for shortest post by Ireland - AI crashed?Brett2018/08/04 06:40 PM
                            New record for shortest post by Ireland - AI crashed?anonymou52018/08/04 07:38 PM
                  Auto-vectorization of random C is a dead endnoko2018/08/04 09:46 PM
        The story of ispc (a 12 entry blog series)Simon Farnsworth2018/08/01 03:50 AM
          the 1st link is empty (NT)Michael S2018/08/01 04:05 AM
            the 1st link is emptySimon Farnsworth2018/08/01 06:42 AM
          Interesting read, thanks! (NT)SoftwareEngineer2018/08/01 06:57 AM
          Amazing readLaurent2018/08/01 09:00 AM
            Amazing readPassing Through2018/08/01 01:13 PM
              Amazing readDoug S2018/08/01 02:30 PM
                Amazing readPassing Through2018/08/01 02:49 PM
          ISPC vs OpenCL?j2018/08/02 11:41 PM
            ISPC vs OpenCL?coppcie2018/08/03 03:55 AM
            ISPC vs OpenCL?Passing Through2018/08/03 04:07 AM
              Go awayForum Reader2018/08/03 08:11 AM
              ISPC vs OpenCL?Gian-Carlo Pascutto2018/09/11 06:50 AM
            ISPC vs OpenCL?SoftwareEngineer2018/08/03 04:18 AM
        Knights Landing - time for obituary?Kevin G2018/08/01 07:14 AM
          Knights Landing - time for obituary?SoftwareEngineer2018/08/01 07:29 AM
        Knights Landing - time for obituary?Passing Through2018/08/01 07:38 AM
          Knights Landing - time for obituary?Eric Bron2018/08/02 06:57 AM
            Knights Landing - time for obituary?Passing Through2018/08/02 12:29 PM
              Knights Landing - time for obituary?Eric Bron2018/08/02 01:49 PM
                Knights Landing - time for obituary?Passing Through2018/08/02 02:17 PM
          chess algorithms vs, low level optimizationsEric Bron2018/08/02 07:15 AM
            AlphaZero vs StockfishMichael S2018/08/02 07:55 AM
              AlphaZero vs StockfishEric Bron2018/08/02 08:24 AM
                AlphaZero vs StockfishMichael S2018/08/02 09:01 AM
                  AlphaZero vs StockfishEric Bron2018/08/02 09:11 AM
                  Leela 4th vs all othersEric Bron nli2018/09/11 03:40 AM
              AlphaZero vs StockfishGian-Carlo Pascutto2018/09/11 06:31 AM
                AlphaZero vs StockfishEric Bron2018/09/11 09:26 AM
                  AlphaZero vs StockfishEric Bron2018/09/11 09:58 AM
        C/C++ and vector/parallel/distributedRichardC2018/08/02 05:50 AM
      Knights Landing - time for obituary?Passing Through2018/08/01 07:52 AM
        Knights Landing - time for obituary?Kevin G2018/08/01 02:03 PM
          Knights Landing - time for obituary?Passing Through2018/08/01 02:33 PM
      Knights Landing - time for obituary?Kevin G2018/08/01 08:26 AM
        Knights Landing - time for obituary?Kevin G2018/08/01 08:26 AM
        Knights Landing - time for obituary?juanrga2018/08/01 02:26 PM
          Knights Landing - time for obituary?hobel2018/08/02 05:46 AM
    Knights Landing - time for obituary?juanrga2018/07/31 11:25 PM
      Right, time for obituary for whole LRB lineageAM2018/08/02 11:46 AM
        Right, time for obituary for whole LRB lineageAdrian2018/08/02 11:46 PM
          LRBNI, AVX512, etc...Michael S2018/08/03 05:23 AM
        Right, time for obituary for whole LRB lineagejuanrga2018/08/03 04:11 AM
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How do you spell green?