Knights Landing L/S bandwidth

Article: Knights Landing Details
By: Michael S (already5chosen.delete@this.yahoo.com), January 8, 2014 1:29 pm
Room: Moderated Discussions
Nicolas Capens (nicolas.capens.delete@this.gmail.com) on January 8, 2014 2:02 pm wrote:
> Michael S (already5chosen.delete@this.yahoo.com) on January 8, 2014 1:42 am wrote:
> > Nicolas Capens (nicolas.capens.delete@this.gmail.com) on January 7, 2014 9:55 pm wrote:
> > > Michael S (already5chosen.delete@this.yahoo.com) on January 7, 2014 4:17 pm wrote:
> > > > You ignore 2 GPR accesses and one RS access needed to do your "symbolic" matching. Or 3 RS access,
> > > > if underlying architecture is, indeed, Silvermont which holds pre-read register values in RS.
> > > > RS is significantly narrower than VPU register file, probably has more entries,
> > > > so overall I'd expect that 3 RS lokups take about the same energy as one VPU
> > > > RF lookup, but than you add L0 lookup itself on top of it and you lost.
> > >
> > > The point of a symbolic lookup is to not access any GPR
> > > registers at all. You just match the encoding of the
> > > memory operand in the instruction. For example in Eric's code there are multiple accesses to [rax+r14*4].
> > > As long as rax and r14 don't change,
> >
> > And how exactly do you track rax and r14 changes if not via existing OoO structures?
>
> Just monitor the result bus. This isn't a hard thing to do.

Sound like handwaving.

> I'm afraid you're grasping at straws. An L0 like
> this is quite feasible and see no reason why it wouldn't be more power efficient than the register file.
>

You see no reasons...



> > > and as long as the corresponding L1 cache line isn't written to, any
> > > instruction with the same source memory operand encoding can use the data that was previously loaded.
> > >
> > > > > > But that's
> > > > > > not my point. My point is - compiler never tries to make execution more power efficient.
> > > > > > [Without PGO] at best, compiler tries to make execution faster in local context. And
> > > > > > today's compilers are not particularly good even at that more modest goal.
> > > > >
> > > > > With an L0 cache there's no need to hold back on using memory operands, which saves registers
> > > > > and thus lowers register pressure, allowing better register allocation: more performance. It also
> > > > > avoids a dependency on that register, so there's also no added latency: more performance.
> > > > >
> > > > > So even if the compiler would only be optimizing for performance, if there's
> > > > > an L0 cache using memory operands would be the right thing to do.
> > > >
> > > > Memory operands are bad for Ifetch. Too many of them probably no good for Idecode.
> > >
> > > According to David's article on Silvermont, it can decode any instruction which is not micro-coded, at full
> > > throughput.
> >
> > Paper tends to perform better than silicon.
> > Paper Silvermont will easily decode 2 instructions per clock.
> > I would be positively surprised if silicon Silvermont is able to sustain decoding
> > rate of 1.7 instruction per clock for long non-microcoded instructions.
>
> Again you're grasping at straws. A decode rate of 1.7 instead of 2 would strengthens my case that
> one L1 load port suffices. And if you think two are required, then the decode rate has to be as
> close to 2 as possible. So no matter how you look at it this argument isn't helping you.
>

When I said that I have an opinion about the # of L1D load ports?
I am just saying that your far-fetched conclusions are built on sand.

> > > Also, what are you even arguing against/for here?
> >
> > I am arguing against looking at icc output as a gospel.
> > IMHO, it means nothing at all.
>
> No, you were arguing about instruction fetch/decode there. You just didn't
> explain how it's supposed to add weight to requiring more L1 read ports.
>

See above.

> > > Knights Landing has two L1 load ports but it
> > > can not sustain the decoding of two instructions with a memory operand per cycle? Obviously they'll have to
> > > ensure that KNL can sustain two AVX-512 instructions with
> > > a memory operand. Not just source operand but also
> > > destination memory operands (which would have no effect on the L1 load port question) necessitate that.
> > >
> > > > And I still didn't figure out how you are going to avoid trashing
> > > > of your tiny L0. I think, to avoid catastrophic
> > > > trashing you will need full associativity, at least 8 entries per thread and not too sloppy pseudo-LRU.
> > >
> > > Please look at Eric's code again. With just two L0 entries per thread it could eliminate
> > > 6 accesses to L1, which is plenty to require L1 to only have one load port.
> >
> > Special case.
> > Anything relying on just 2 LRUed entries without additional
> > heuristics will be brittle to the edge of uselessness.
>
> It's not a special case by any stretch. Both of Eric's examples reused memory operands where they could
> have *easily* used register operand,

Look at the 3rd Eric's example:
http://www.realworldtech.com/forum/?threadid=138897&curpostid=139104
The one with __restrict


> so this is clearly a specific compiler rule that affects all code.

Yes, it looks like compiler rule, but the rule is much less sophisticated than you imagine.

> Reusing a source operand only a couple instructions later is extremely common, but it would typically
> use a register. The fact that this code doesn't is an indication that Intel knows there's a specific
> advantage to it, and the existence of a tiny L0 cache would completely support that.

Now, if you are really interested in my opinions, they are about like that:
1. uAarch that has decode rate equal to # of VPUs looks wrong.
2. Number of load units in the core must be equal to number of load ports in L1D cache. But the ports don't have to be "true". Banked pseudo-ports are acceptable.
Pay attention, I said "must be equal each other", not "must be equal to 2".

So far the only KNL theory that makes sense to me is that everybody on RWT are confused. KNL consists of 72 dual-core modules rather than of 72 cores. Each core has 2-way instruction decoder, 1 VPU, 1 512-bit L1D load port and 1 512-bit L1D store port. I don't know whether load and store are possible in the same clock cycle.
Also each core is more likely to have 1 or 2 HW threads rather than 4.



< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Knights Landing details (new article)David Kanter2014/01/02 11:58 PM
  eDRAM as cacheiz2014/01/03 03:39 AM
    eDRAM optionsEric Bron2014/01/09 02:45 AM
  Knights Landing details (new article)Emil Briggs2014/01/03 05:06 AM
  Knights Landing details (new article)Michael S2014/01/03 06:05 AM
    PCI-E and QPIDavid Kanter2014/01/03 11:11 AM
  eDRAM still seems too expensive ...Mark Roulo2014/01/03 09:48 AM
    Nevermind ... I see that you addressed this :-)Mark Roulo2014/01/03 09:51 AM
    eDRAM still seems too expensive ...Eric Bron2014/01/03 12:42 PM
  eDRAM or stacked DRAM?Patrick Chase2014/01/03 10:21 AM
    eDRAM or stacked DRAM?Wes Felter2014/01/03 02:00 PM
      eDRAM or stacked DRAM?Patrick Chase2014/01/03 06:26 PM
        eDRAM or stacked DRAM?tarlinian2014/06/23 08:59 PM
          eDRAM or stacked DRAM?Maynard Handley2014/06/24 12:47 AM
            eDRAM or stacked DRAM?Michael S2014/06/24 02:13 AM
            eDRAM or stacked DRAM?David Kanter2014/06/24 11:09 AM
              eDRAM or stacked DRAM?anon2014/06/24 06:50 PM
                eDRAM or stacked DRAM?Eric Bron2014/06/24 09:02 PM
                  eDRAM or stacked DRAM?anon2014/06/24 09:39 PM
                eDRAM or stacked DRAM?Michael S2014/06/25 12:46 AM
              eDRAM or stacked DRAM?Michael S2014/06/25 12:29 AM
          eDRAM or stacked DRAM?Eric Bron2014/06/24 04:37 AM
            eDRAM or stacked DRAM?tarlinian2014/06/24 07:53 AM
              eDRAM or stacked DRAM?Eric Bron2014/06/24 08:09 AM
                eDRAM or stacked DRAM?tarlinian2014/06/24 08:40 AM
                  eDRAM or stacked DRAM?Eric Bron2014/06/24 09:10 AM
                    eDRAM or stacked DRAM?Eric Bron2014/06/24 09:12 AM
          eDRAM or stacked DRAM?Wes Felter2014/06/24 09:09 PM
            eDRAM or stacked DRAM?Michael S2014/06/25 01:02 AM
  Why not tag-inclusive L3?Paul A. Clayton2014/01/03 03:28 PM
    Why not tag-inclusive L3?Eric Bron2014/01/04 02:22 AM
  Knights Landing L/S bandwidthNicolas Capens2014/01/04 04:43 AM
    Knights Landing L/S bandwidthEric Bron2014/01/04 05:20 AM
      Knights Landing L/S bandwidthNicolas Capens2014/01/04 01:55 PM
        Knights Landing L/S bandwidthEric Bron2014/01/04 02:27 PM
          Knights Landing L/S bandwidthhobold2014/01/04 03:23 PM
            Knights Landing L/S bandwidthEric Bron2014/01/04 04:20 PM
              Knights Landing L/S bandwidthMichael S2014/01/05 02:42 AM
                Knights Landing L/S bandwidthEric Bron2014/01/05 02:49 AM
                  Knights Landing L/S bandwidthPatrick Chase2014/01/11 07:13 PM
                    Knights Landing L/S bandwidthNicolas Capens2014/01/13 07:39 PM
                Knights Landing L/S bandwidthNicolas Capens2014/01/05 02:18 PM
                  Knights Landing L/S bandwidthMichael S2014/01/06 03:09 AM
                    Knights Landing L/S bandwidthEric Bron2014/01/06 04:11 AM
                      Knights Landing L/S bandwidthMichael S2014/01/06 04:40 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/06 04:54 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/08 08:00 AM
                    Knights Landing L/S bandwidthNicolas Capens2014/01/07 02:31 PM
                      Knights Landing L/S bandwidthMichael S2014/01/07 03:17 PM
                        Knights Landing L/S bandwidthNicolas Capens2014/01/07 08:55 PM
                          Knights Landing L/S bandwidthMichael S2014/01/08 12:42 AM
                            Knights Landing L/S bandwidthGabriele Svelto2014/01/08 07:30 AM
                              Occam's razorNicolas Capens2014/01/08 01:33 PM
                                Occam's razorGabriele Svelto2014/01/08 01:51 PM
                                  Occam's razorEric Bron2014/01/08 02:28 PM
                                    Occam's razorbakaneko2014/01/09 03:45 AM
                                      Occam's razoranon2014/01/09 04:02 AM
                                        Occam's razorbakaneko2014/01/09 05:24 AM
                                          Occam's razorbakaneko2014/01/09 05:51 AM
                                            Occam's razoranon2014/01/09 06:18 AM
                                          Occam's razoranon2014/01/09 06:16 AM
                                            Occam's razorbakaneko2014/01/09 07:43 AM
                                              Occam's razoranon2014/01/09 08:17 AM
                                                Occam's razorbakaneko2014/01/09 10:12 AM
                                                  Occam's razorEric Bron2014/01/09 10:18 AM
                                                    Occam's razorbakaneko2014/01/09 10:58 AM
                                                  Occam's razoranon2014/01/09 11:35 AM
                                                    Occam's razorbakaneko2014/01/12 09:48 AM
                                                  99.9% not a new extensionNicolas Capens2014/01/10 10:39 AM
                                                    Compiler complexityGabriele Svelto2014/01/11 02:58 AM
                                                      Compiler complexityNicolas Capens2014/01/11 12:20 PM
                                                        Compiler complexityGabriele Svelto2014/01/11 02:17 PM
                                                          Patent pendingNicolas Capens2014/01/14 06:21 PM
                                                    99.9% not a new extensionbakaneko2014/01/12 10:08 AM
                                  L0 data cacheEric Bron2014/01/08 03:52 PM
                                  Occam's razorDavid Kanter2014/01/08 03:53 PM
                                    Occam's razorNicolas Capens2014/01/09 02:07 AM
                                      Occam's razorRicardo B2014/01/09 04:21 AM
                                        Virtually indexed, untaggedNicolas Capens2014/01/10 10:27 AM
                                          Virtually indexed, untaggedGabriele Svelto2014/01/11 03:08 AM
                                            Virtually indexed, untaggedNicolas Capens2014/01/11 08:45 PM
                                              Virtually indexed, untaggedDavid Kanter2014/01/12 01:13 AM
                                                Virtually indexed, untaggedanon2014/01/12 03:02 AM
                                                Virtually indexed, untaggedNicolas Capens2014/01/16 08:55 AM
                                              Virtually indexed, untaggedMichael S2014/01/12 03:09 AM
                                                Virtually indexed, untaggedNicolas Capens2014/01/16 09:47 AM
                                      Occam's razorDavid Kanter2014/01/09 05:42 PM
                                        Occam's razorNicolas Capens2014/01/10 01:22 PM
                                          Occam's razorDavid Kanter2014/01/10 03:06 PM
                                            MEM : ALU ratioNicolas Capens2014/01/10 11:24 PM
                                              MEM : ALU ratioGabriele Svelto2014/01/11 02:47 AM
                                                MEM : ALU ratioEric Bron2014/01/11 03:41 AM
                                                  MEM : ALU ratioEric Bron2014/01/11 04:06 AM
                                                    MEM : ALU ratioDavid Kanter2014/01/11 07:28 PM
                                                      MEM : ALU ratioEric Bron nli2014/01/12 01:54 AM
                                                  MEM : ALU ratioGabriele Svelto2014/01/11 09:15 AM
                                                MEM : ALU ratioNicolas Capens2014/01/14 05:56 PM
                                                  Etiquette in linking to papersPaul A. Clayton2014/01/14 06:44 PM
                                                  MEM : ALU ratioanon2014/01/14 07:32 PM
                                                    L0 power costNicolas Capens2014/01/16 01:05 PM
                                                      L0 power costanon2014/01/16 09:01 PM
                                                        L0 power costNicolas Capens2014/01/18 11:30 PM
                                                          Links revealedPaul A. Clayton2014/01/19 03:47 PM
                                                          L0 power costanon2014/01/20 12:19 AM
                                                            L0 power costNicolas Capens2014/01/20 01:49 PM
                                                              L0 power costanon2014/01/21 12:18 AM
                                                                Q.E.D.Nicolas Capens2014/01/21 07:44 PM
                                                                  Q.E.D.anon2014/01/21 08:24 PM
                                                                    Straw manNicolas Capens2014/01/23 10:56 PM
                                                                      Straw mananon2014/01/25 05:46 AM
                                                                        Still waiting for an explanationNicolas Capens2014/01/25 11:19 PM
                                                                          Still waiting for an explanationExophase2014/01/26 12:13 PM
                                                                            Still waiting for an explanationbakaneko2014/01/26 10:52 PM
                                                                  Q.E.D.Ricardo B2014/01/22 05:58 PM
                                                                    Q.E.D.Michael S2014/01/23 03:59 AM
                                                                      L0 entry countNicolas Capens2014/01/24 12:11 AM
                                                                        L0 entry countEric Bron2014/01/24 01:08 AM
                                                                          L0 entry countMichael S2014/01/24 05:18 AM
                                                                            L0 entry countEric Bron2014/01/24 06:15 AM
                                                                              L0 entry countMichael S2014/01/24 07:10 AM
                                                                                L0 entry countEric Bron2014/01/24 07:20 AM
                                                                          L0 entry countNicolas Capens2014/01/24 01:33 PM
                                                                            L0 entry countEric Bron2014/01/24 02:20 PM
                                                                              L0 entry count and L1 read port orthogonalityNicolas Capens2014/01/26 12:14 AM
                                                                                L0 entry count and L1 read port orthogonalityEric Bron2014/01/26 02:49 AM
                                                                    L0 hit rateNicolas Capens2014/01/23 11:49 PM
                                                                      L0 hit rateRicardo B2014/01/24 05:42 AM
                                                                        L0 hit rateExophase2014/01/24 12:37 PM
                                                                          L0 hit rateEric Bron2014/01/24 01:12 PM
                                                                        L0 vs RF powerNicolas Capens2014/01/24 01:43 PM
                                              MEM : ALU ratioDavid Kanter2014/01/11 12:47 PM
                                                MEM : ALU ratioNicolas Capens2014/01/16 08:23 AM
                                                  MEM : ALU ratioStubabe2014/01/17 11:58 AM
                                                    MEM : ALU ratioStubabe2014/01/17 12:42 PM
                                                      MEM : ALU ratioMichael S2014/01/18 03:57 PM
                                                        MEM : ALU ratiobakaneko2014/01/18 11:47 PM
                                                    MEM : ALU ratioNicolas Capens2014/01/20 02:48 PM
                                                      It's called "tunnel vision" (NT)iz2014/01/20 03:36 PM
                                                      MEM : ALU ratioMichael S2014/01/20 03:37 PM
                                                        MEM : ALU ratioStubabe2014/01/21 03:54 PM
                                                        MEM : ALU ratioNicolas Capens2014/01/21 09:07 PM
                                                          MEM : ALU ratioMichael S2014/01/22 07:17 AM
                                                            MEM : ALU ratioNicolas Capens2014/01/24 02:33 PM
                                                      MEM : ALU ratioStubabe2014/01/21 03:32 PM
                                                        MEM : ALU ratioMichael S2014/01/22 07:56 AM
                                                          MEM : ALU ratioStubabe2014/01/23 08:06 AM
                                                            MEM : ALU ratioEric Bron2014/01/23 08:45 AM
                                                              editEric Bron2014/01/23 08:49 AM
                                                            MEM : ALU ratioMichael S2014/01/23 08:58 AM
                                                              MEM : ALU ratioEric Bron2014/01/23 09:29 AM
                                                                MEM : ALU ratioMichael S2014/01/23 09:33 AM
                                                              MEM : ALU ratioStubabe2014/01/24 03:50 AM
                                                MEM : ALU ratiobakaneko2014/01/23 09:36 AM
                                              MEM : ALU ratioNoSpammer2014/01/11 02:39 PM
                                                L1 vs L0 access costNicolas Capens2014/01/16 02:17 PM
                                                  L1 vs L0 access costNoSpammer2014/01/19 12:48 PM
                                                    L1 vs L0 access costdmcq2014/01/22 04:45 AM
                                                      L1 vs L0 access costGabriele Svelto2014/01/22 06:29 AM
                                                        L1 vs L0 access costdmcq2014/01/22 12:33 PM
                                                          L1 vs L0 access costGabriele Svelto2014/01/22 03:33 PM
                                                            L1 vs L0 access costdmcq2014/01/24 03:19 AM
                                                    L1 vs L0 access costNicolas Capens2014/01/24 01:16 AM
                                      Occam's razorPatrick Chase2014/01/13 10:19 AM
                                  Occam's razorNicolas Capens2014/01/08 11:40 PM
                                    Occam's razorGabriele Svelto2014/01/09 01:41 AM
                                      Occam's razorEric Bron2014/01/09 01:54 AM
                                        Occam's razorGabriele Svelto2014/01/09 05:35 AM
                                          Occam's razorEric Bron2014/01/09 06:14 AM
                                            avoiding redundant loadsEric Bron2014/01/09 06:18 AM
                                            AVX2 versionEric Bron2014/01/09 06:32 AM
                                      Occam's razorAmiba Gelos2014/01/09 02:01 AM
                                        Occam's razorEric Bron2014/01/09 02:06 AM
                                          Occam's razorAmiba Gelos2014/01/09 02:43 AM
                                            Occam's razorEric Bron2014/01/09 03:02 AM
                                        L0 access latencyNicolas Capens2014/01/09 03:27 AM
                                          L0 access latencyAmiba Gelos2014/01/09 04:16 AM
                                            compared to L0$ i would say banking is far more likely (NT)Amiba Gelos2014/01/09 04:20 AM
                                            L0 access latencyNicolas Capens2014/01/10 02:20 PM
                                      Occam's razorNicolas Capens2014/01/09 03:19 AM
                                    Occam's razorNoSpammer2014/01/09 11:55 AM
                                      Occam's razorNicolas Capens2014/01/10 02:40 PM
                                        Occam's razorMichael S2014/01/11 09:21 AM
                                        Occam's razorMichael S2014/01/12 02:21 PM
                                          KNC compiler outputNicolas Capens2014/01/16 05:39 PM
                                            KNC compiler outputMichael S2014/01/18 04:13 PM
                                    L0 cache coherencyDavid Kanter2014/01/11 07:39 PM
                                Occam's razoranon2014/01/09 04:12 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/08 09:46 AM
                              Knights Landing L/S bandwidthMichael S2014/01/08 10:23 AM
                            Knights Landing L/S bandwidthNicolas Capens2014/01/08 01:02 PM
                              Knights Landing L/S bandwidthMichael S2014/01/08 01:29 PM
                                Knights Landing L/S bandwidthEric Bron2014/01/08 01:54 PM
                                  Knights Landing L/S bandwidthMichael S2014/01/08 02:00 PM
                                    Knights Landing L/S bandwidthEric Bron2014/01/08 02:13 PM
                                      Knights Landing L/S bandwidthMichael S2014/01/08 02:28 PM
                                        Knights Landing L/S bandwidthEric Bron2014/01/08 02:32 PM
                                          Knights Landing L/S bandwidthMichael S2014/01/08 02:40 PM
                                            Knights Landing L/S bandwidthEric Bron2014/01/08 02:51 PM
                                              Knights Landing L/S bandwidthMichael S2014/01/09 11:18 AM
                          Knights Landing L/S bandwidthPatrick Chase2014/01/12 09:03 PM
                            Also page/line splits?David Kanter2014/01/12 09:50 PM
                              Also page/line splits?anon2014/01/13 12:44 AM
                                Also page/line splits?none2014/01/13 02:09 AM
                                  Also page/line splits?anon2014/01/13 03:19 AM
                            Knights Landing L/S bandwidthExophase2014/01/12 11:15 PM
                            Knights Landing L/S bandwidthanon2014/01/13 12:41 AM
                              Knights Landing L/S bandwidthPatrick Chase2014/01/13 10:14 AM
                            Aliased writesNicolas Capens2014/01/14 08:46 PM
                      Knights Landing L/S bandwidthRicardo B2014/01/07 03:27 PM
                        Knights Landing L/S bandwidthNicolas Capens2014/01/07 09:28 PM
                          Knights Landing L/S bandwidthRicardo B2014/01/08 01:13 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/08 10:10 AM
                            Knights Landing L/S bandwidthNicolas Capens2014/01/08 02:31 PM
                              Knights Landing L/S bandwidthRicardo B2014/01/08 02:58 PM
                                Knights Landing L/S bandwidthG. Gouvine2014/01/09 08:10 AM
                                  Knights Landing L/S bandwidthRicardo B2014/01/09 10:19 AM
                                    Efficient load queue vs. efficient L0 cacheNicolas Capens2014/01/11 11:28 AM
                                      Efficient load queue vs. efficient L0 cacheG. Gouvine2014/01/13 01:11 AM
                                        Efficient load queue vs. efficient L0 cacheMichael S2014/01/13 02:43 AM
                                Register file read port requirementsNicolas Capens2014/01/10 11:55 PM
                                  Register file read port requirementsRicardo B2014/01/11 04:24 AM
                                    Register file read port requirementsEric Bron2014/01/11 04:32 AM
                                      Register file read port requirementsMichael S2014/01/11 08:57 AM
                                        Register file read port requirementsEric Bron2014/01/11 10:16 AM
                                          Register file read port requirementsMichael S2014/01/11 10:46 AM
                                            Register file read port requirementsEric Bron2014/01/11 11:12 AM
                                              Register file read port requirementsMichael S2014/01/11 11:36 AM
                                                Register file read port requirementsEric Bron2014/01/11 11:51 AM
                                              Register file read port requirementsPatrick Chase2014/01/13 01:27 PM
                                                Register file read port requirementsEric Bron2014/01/13 03:24 PM
                                                  Register file read port requirementsPatrick Chase2014/01/13 05:02 PM
                                                    Register file read port requirementsEric Bron2014/01/14 03:50 AM
                                                      Register file read port requirementsMichael S2014/01/14 10:36 AM
                                                        Register file read port requirementsEric Bron nli2014/01/14 12:04 PM
                                            Register file read port requirementsPatrick Chase2014/01/13 01:17 PM
                                              Register file read port requirementsMichael S2014/01/15 03:27 AM
                                        Register file read port requirementsEric Bron2014/01/11 10:28 AM
                                          Register file read port requirementsMichael S2014/01/11 11:07 AM
                                            Register file read port requirementsPatrick Chase2014/01/13 01:40 PM
                                          Register file read port requirementsPatrick Chase2014/01/13 01:34 PM
                                      Register file read port requirementsRicardo B2014/01/11 11:55 AM
                                        Register file read port requirementsEric Bron2014/01/11 12:17 PM
                                          Register file read port requirementsRicardo B2014/01/11 01:36 PM
                                            Register file read port requirementsEric Bron2014/01/11 01:42 PM
                                              Register file read port requirementsRicardo B2014/01/11 02:20 PM
                                                Register file read port requirementsEric Bron2014/01/11 02:26 PM
                                                  Register file read port requirementsMichael S2014/01/11 03:07 PM
                                                    Register file read port requirementsRicardo B2014/01/11 03:38 PM
                                                      Register file read port requirementsMichael S2014/01/11 03:49 PM
                                                Register file read port requirementsEric Bron2014/01/11 02:39 PM
                                                  Register file read port requirementsEric Bron2014/01/11 02:41 PM
                                                  Register file read port requirementsRicardo B2014/01/11 03:30 PM
                                    Register file read port requirementsNicolas Capens2014/01/11 11:09 AM
              Knights Landing L/S bandwidthanon2014/01/05 05:55 AM
                Knights Landing L/S bandwidthEric Bron2014/01/05 06:30 AM
                  Knights Landing L/S bandwidthanon2014/01/06 12:07 AM
                    Knights Landing L/S bandwidthEric Bron2014/01/06 01:38 AM
                      Knights Landing L/S bandwidthanon2014/01/06 03:01 AM
                        Knights Landing L/S bandwidthEric Bron2014/01/06 03:44 AM
                          Knights Landing L/S bandwidthanon2014/01/06 04:39 AM
                            Knights Landing L/S bandwidthEric Bron2014/01/06 05:00 AM
                              Knights Landing L/S bandwidthanon2014/01/06 05:44 AM
                                Knights Landing L/S bandwidthMichael S2014/01/06 07:54 AM
                                  Knights Landing L/S bandwidthEric Bron2014/01/06 09:11 AM
                                    Knights Landing L/S bandwidthMichael S2014/01/06 09:14 AM
                                      Knights Landing L/S bandwidthEric Bron2014/01/06 10:37 AM
                                        Knights Landing L/S bandwidthRicardo B2014/01/08 05:25 AM
                                          Knights Landing L/S bandwidthEric Bron2014/01/08 07:36 AM
                                            Knights Landing L/S bandwidthEric Bron2014/01/08 07:41 AM
                                            KNC code generator with EVEX back-end?Michael S2014/01/08 08:43 AM
                                              KNC code generator with EVEX back-end?Exophase2014/01/08 09:00 AM
                                                KNC code generator with EVEX back-end?Ricardo B2014/01/08 10:39 AM
                                                  KNC code generator with EVEX back-end?Eric Bron2014/01/08 11:15 AM
                                                    KNC code generator with EVEX back-end?Exophase2014/01/08 12:17 PM
                                                      KNC code generator with EVEX back-end?Ricardo B2014/01/08 01:06 PM
                                                        KNC code generator with EVEX back-end?Exophase2014/01/08 01:24 PM
                                                        KNC code generator with EVEX back-end?Eric Bron2014/01/08 01:38 PM
                                                    KNC code generator with EVEX back-end?Michael S2014/01/08 12:54 PM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 09:25 AM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 09:35 AM
                                                KNC code generator with EVEX back-end?Michael S2014/01/08 10:07 AM
                                                  KNC code generator with EVEX back-end?Eric Bron2014/01/08 10:24 AM
                                                    KNC code generator with EVEX back-end?Michael S2014/01/08 10:43 AM
                                                      KNC code generator with EVEX back-end?Eric Bron2014/01/08 12:23 PM
                                              KNC code generator with EVEX back-end?Eric Bron2014/01/08 09:43 AM
                                          AVX2 code much different than AVX-512Eric Bron2014/01/08 07:52 AM
                                            evil questionhobold2014/01/08 09:22 AM
                                              evil questionEric Bron2014/01/08 09:27 AM
                                                evil questionhobold2014/01/08 01:33 PM
                                                  evil questionMichael S2014/01/08 01:37 PM
                                                    stupid question (was: evil question)hobold2014/01/09 04:41 AM
                                                      stupid question (was: evil question)Eric Bron2014/01/09 04:52 AM
                                                        stupid question (was: evil question)Michael S2014/01/09 07:00 AM
                                                          stupid question (was: evil question)Michael S2014/01/09 07:12 AM
                                                            stupid question (was: evil question)Eric Bron2014/01/09 09:47 AM
                                                              stupid question (was: evil question)Michael S2014/01/09 10:48 AM
                                                                more decisive (hopefully) test caseMichael S2014/01/09 11:01 AM
                                                                  more decisive (hopefully) test caseEric Bron2014/01/09 11:08 AM
                                                                    more decisive (hopefully) test caseMichael S2014/01/09 11:24 AM
                                                                      more decisive (hopefully) test caseEric Bron2014/01/09 11:27 AM
                                                                        more decisive (hopefully) test caseMichael S2014/01/09 11:33 AM
                                                                  AVX2Eric Bron2014/01/09 11:14 AM
                                                                    AVX2Michael S2014/01/09 11:30 AM
                                                                      AVX2Eric Bron2014/01/09 11:40 AM
                                                                  another tryMichael S2014/01/09 02:02 PM
                                                                    another tryEric Bron2014/01/09 02:33 PM
                                                                      another tryMichael S2014/01/09 03:20 PM
                                                                      another try - ignore misformated mess aboveMichael S2014/01/09 03:24 PM
                                                                        another try - ignore misformated mess aboveGabriele Svelto2014/01/10 12:01 AM
                                                                          another try - ignore misformated mess aboveEric Bron2014/01/10 02:05 AM
                                                                            another try - ignore misformated mess aboveMichael S2014/01/11 09:23 AM
                                                                              another try - ignore misformated mess aboveEric Bron2014/01/11 10:08 AM
                                                                                another try - ignore misformated mess aboveMichael S2014/01/11 11:09 AM
                                                                                  another try - ignore misformated mess aboveMichael S2014/01/11 11:12 AM
                                                                                    another try - ignore misformated mess aboveEric Bron2014/01/11 11:24 AM
                                                                                      another try - ignore misformated mess aboveMichael S2014/01/11 12:24 PM
                                                                                        another try - ignore misformated mess aboveEric Bron2014/01/11 01:11 PM
                                                                                          another try - ignore misformated mess aboveMichael S2014/01/11 01:18 PM
                                                                                            another try - ignore misformated mess aboveEric Bron2014/01/11 01:27 PM
                                                                                              another try - ignore misformated mess aboveMichael S2014/01/11 01:29 PM
                                                                                                another try - ignore misformated mess aboveEric Bron2014/01/11 01:46 PM
                                                                                                  another try - ignore misformated mess aboveEric Bron2014/01/11 01:46 PM
                                                                                                  another try - ignore misformated mess aboveMichael S2014/01/11 02:28 PM
                                                                                        another try - ignore misformated mess aboveEric Bron2014/01/11 01:17 PM
                                                                                          another try - ignore misformated mess aboveMichael S2014/01/11 01:24 PM
                                                                    KNC versionMichael S2014/01/11 04:19 PM
                                                                      KNC versionEric Bron nli2014/01/12 01:59 AM
                                                                        KNC versionGabriele Svelto2014/01/12 08:06 AM
                                                  evil questionEric Bron2014/01/08 01:41 PM
              Knights Landing L/S bandwidthPatrick Chase2014/01/05 10:20 PM
                Knights Landing L/S bandwidthEric Bron2014/01/06 01:45 AM
                  Knights Landing L/S bandwidthanon2014/01/06 03:12 AM
                    Knights Landing L/S bandwidthMichael S2014/01/06 03:17 AM
                      Knights Landing L/S bandwidthanon2014/01/06 04:20 AM
          Knights Landing L/S bandwidthNicolas Capens2014/01/04 04:34 PM
            Knights Landing L/S bandwidthEric Bron2014/01/04 04:44 PM
              Knights Landing L/S bandwidthNicolas Capens2014/01/05 11:25 AM
                Knights Landing L/S bandwidthEric Bron2014/01/05 12:50 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/05 02:34 PM
                    Might even help with gatherNicolas Capens2014/01/05 02:40 PM
                      What is an L0 cache?David Kanter2014/01/05 09:44 PM
                        What is an L0 cache?anon2014/01/06 04:57 AM
                          What is an L0 cache?Nicolas Capens2014/01/06 11:57 AM
                            What is an L0 cache?anon2014/01/06 01:18 PM
    Knights Landing L/S bandwidthDavid Kanter2014/01/04 09:58 AM
      Knights Landing L/S bandwidthNicolas Capens2014/01/04 03:24 PM
        Knights Landing L/S bandwidthEric Bron2014/01/04 03:46 PM
          Knights Landing L/S bandwidthKonrad Schwarz2014/01/07 11:48 PM
            Knights Landing L/S bandwidthMichael S2014/01/08 01:45 AM
        Knights Landing L/S bandwidthDavid Kanter2014/01/05 12:44 AM
          Knights Landing L/S bandwidthEric Bron2014/01/05 02:55 AM
          Knights Landing L/S bandwidthNicolas Capens2014/01/05 11:18 AM
            Knights Landing L/S bandwidthMaynard Handley2014/01/05 10:33 PM
              Knights Landing L/S bandwidthEric Bron2014/01/06 03:02 AM
                Knights Landing L/S bandwidthMichael S2014/01/06 03:23 AM
                  Knights Landing L/S bandwidthEric Bron2014/01/06 03:35 AM
                    Knights Landing L/S bandwidthMichael S2014/01/06 04:20 AM
                      Knights Landing L/S bandwidthMichael S2014/01/06 04:32 AM
                      Knights Landing L/S bandwidthEric Bron2014/01/06 04:36 AM
                        Knights Landing L/S bandwidthMichael S2014/01/06 05:00 AM
                          Knights Landing L/S bandwidthEric Bron2014/01/06 05:07 AM
                          Knights Landing L/S bandwidthEric Bron2014/01/06 05:14 AM
                            editsEric Bron2014/01/06 05:22 AM
                              optimized versionEric Bron2014/01/06 05:35 AM
                                yet more optimized versionEric Bron2014/01/06 05:42 AM
                                  latest version for todayEric Bron2014/01/06 05:51 AM
                                    Probably just L2 bandwith limitedNicolas Capens2014/01/06 10:48 AM
                                  yet more optimized versionMaynard Handley2014/01/06 05:54 PM
                                optimized versionMaynard Handley2014/01/06 05:52 PM
                                  optimized versionMichael S2014/01/07 09:42 AM
                                    optimized versionNicolas Capens2014/01/07 11:36 AM
                                      optimized versionMichael S2014/01/07 02:41 PM
                                        optimized versionNicolas Capens2014/01/07 09:52 PM
                                          optimized versionMichael S2014/01/08 01:10 AM
                                    optimized versionEric Bron2014/01/07 01:34 PM
                                      optimized versionMichael S2014/01/07 02:18 PM
                                        optimized versionEric Bron2014/01/07 02:30 PM
                                          optimized versionEric Bron2014/01/07 02:33 PM
                                            optimized versionMichael S2014/01/07 02:57 PM
                                    optimized versionMaynard Handley2014/01/07 05:50 PM
                                      optimized versionMichael S2014/01/08 01:39 AM
                Knights Landing L/S bandwidthMaynard Handley2014/01/06 05:47 PM
              Knights Landing L/S bandwidthNicolas Capens2014/01/06 08:18 AM
                Knights Landing L/S bandwidthMaynard Handley2014/01/06 05:56 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/07 11:18 AM
        Knights Landing L/S bandwidthNoSpammer2014/01/05 12:15 PM
          Knights Landing L/S bandwidthNicolas Capens2014/01/05 02:06 PM
            Knights Landing L/S bandwidthNoSpammer2014/01/06 03:20 AM
              Knights Landing L/S bandwidthNicolas Capens2014/01/06 10:54 AM
                Knights Landing L/S bandwidthNoSpammer2014/01/06 12:24 PM
                  Knights Landing L/S bandwidthNicolas Capens2014/01/06 08:15 PM
                    Knights Landing L/S bandwidthNoSpammer2014/01/07 02:58 AM
                      Knights Landing L/S bandwidthNicolas Capens2014/01/07 02:18 PM
                        Knights Landing L/S bandwidthNoSpammer2014/01/08 12:38 PM
                          Knights Landing L/S bandwidthNicolas Capens2014/01/08 10:14 PM
  AVX512F questionMichael S2014/01/06 09:18 AM
    AVX512F questionNicolas Capens2014/01/06 11:01 AM
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How do you spell green?