Alder Lake and AVX-512

By: (0xe2.0x9a.0x9b.delete@this.gmail.com), July 12, 2020 11:07 am
Room: Moderated Discussions
Linus Torvalds (torvalds.delete@this.linux-foundation.org) on July 11, 2020 11:41 am wrote:
> me (me.delete@this.me.com) on July 11, 2020 7:02 am wrote:
> > https://www.phoronix.com/scan.php?page=news_item&px=GCC11-SapphireRapids-AlderLake
> >
> > Hope you didn't get too attached to AVX-512. The GCC 11 compiler target for Alder
> > Lake doesn't enable it, only AVX2. As Phoronix mentions the target likely is what
> > the small cores support and not necessarily the big... but it makes me wonder...
>
> I hope AVX512 dies a painful death, and that Intel starts fixing real problems instead of
> trying to create magic instructions to then create benchmarks that they can look good on.
>
> I hope Intel gets back to basics: gets their process working again, and concentrate
> more on regular code that isn't HPC or some other pointless special case.
>
> I've said this before, and I'll say it again: in the heyday of x86, when Intel was laughing all the
> way to the bank and killing all their competition, absolutely everybody else did better than Intel
> on FP loads. Intel's FP performance sucked (relatively speaking), and it matter not one iota.

As far as I remember, in the days of the original Pentium and Pentium MMX, Intel had the best FP32/FP64 performance in x86 CPU space - AMD, Cyrix and Centaur had lower FP32/FP64 performance. Pentium was able to run FP instructions with predictable clock-precision latency in parallel to integer instructions, with the integer instructions having clock-precise performance when using register operands and when operand was in L1 cache.

As far as I know, but I might very well be wrong about this: FP-intensive "apps" such as Doom and Quake didn't have AMD/Cyrix/Centaur-optimized codepaths, they only had codepaths optimized for 486&Pentium.

> Because absolutely nobody cares outside of benchmarks.
>
> The same is largely true of AVX512 now - and in the future. Yes, you can find
> things that care. No, those things don't sell machines in the big picture.
>
> And AVX512 has real downsides. I'd much rather see that transistor budget used on other things that
> are much more relevant. Even if it's still FP math (in the GPU, rather than AVX512). Or just give me
> more cores (with good single-thread performance, but without the garbage like AVX512) like AMD did.
>
> I want my power limits to be reached with regular integer code, not with some AVX512
> power virus that takes away top frequency (because people ended up using it for memcpy!)
> and takes away cores (because those useless garbage units take up space).

First, using AVX-512 for memcpy was kind-of inevitable and to be expected. This is the same situation as in the 90-ties of 20th century when people where using FP64 or MMX instructions to implement memcpy on CPUs having a single memory write port and 32-bit integer instructions. I wrote previously (some months ago) in this forum that with AVX-512 Intel should have clearly separated the 512-bit compute ISA from the 512-bit memcpy/memset ISA.

Secondly, if you were serious about achieving top turbo frequencies on [x86] CPUs then you would be strongly advocating for a CPU package to contain cores which are mainly 32-bit integer cores and are not optimized for 64-bit integer computations expect maybe for FP64 register-register computations. Clearly, about 90% of 64-bit applications are running in 64-bit mode just because 64-bit is the default implementation target today and not because they actually need the 64-bit address space. A 32-bit-centric high-clock CPU core can support 64-bit integer computations but 64-bit would run at half the speed of 32-bit compute.

A random note: LP-DDR5 supports data copy and write-all-0-or-1 commands, so the people who are advocating that selected parts of computation should move from CPUs closer to memory devices might actually be right in the long-term (10+ years). Somewhere in the future, filling a 4 KiB page with zeroes might take just a nanosecond (a few CPU clocks) to submit for execution and 10 nanoseconds to complete (latency). The write-all-1 command is in my opinion pointless and is unnecessarily complicating the memory device implementation.

> Yes, yes, I'm biased. I absolutely destest FP benchmarks, and I realize other people care deeply.
> I just think AVX512 is exactly the wrong thing to do. It's a pet peeve of mine. It's a prime example
> of something Intel has done wrong, partly by just increasing the fragmentation of the market.

I mostly agree, but it should be mentioned that a CPU supporting AVX-512 does not need to have 512-bit wide ALUs. It might be sufficient to have 256-bit or even 128-bit ALUs (and data-paths) and thus split an AVX-512 instruction into 2 or 4 µOPs. The complexity is mostly in the instruction decoder, in the 32*512 = 16384_bits = 2048_bytes register file, and in the fact that AVX-512 might be unnecessarily polluting the instruction encoding space which could have been used to encode some other (potentially more useful) new instructions, such as a "mov reg1, reg2, reg/mem1, reg/mem2" instruction for example.

Thus, clearly and obviously, in addition to an AVX-512 CPUID bit, there should also exist CPUID bits from which an application can tell the width of the CPUs data paths so that it can decide whether and when to use SSE/AVX-128, AVX-256 or AVX-512 optimized codepaths and how to determine what mix of 128/256/512-bit instructions is the right match for achieving the best performance on a CPU with a particular combination of datapath-widths in its CPUID bits.

> Stop with the special-case garbage, and make all the core common stuff that everybody
> cares about run as well as you humanly can. Then do a FPU that is barely good enough
> on the side, and people will be happy. AVX2 is much more than enough.
>
> Yeah, I'm grumpy.
>
> Linus

CPUs are competing with GPUs and in some cases with FPGAs and ASICs. Adding application-specific instructions (such as matrix multiplication) to a general-purpose CPU is trivial compared to how hard it is to improve the IPC of integer code by 25%, especially considering the insufficient/mediocre approaches to improving single-threaded [x86] IPC employed today.

-atom
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TopicPosted ByDate
Alder Lake and AVX-512me2020/07/11 07:02 AM
  Alder Lake and AVX-512Linus Torvalds2020/07/11 11:41 AM
    informative (NT)blue2020/07/11 12:40 PM
    grumpyMichael S2020/07/11 12:51 PM
      grumpyme2020/07/11 01:27 PM
    area and power cost of AVX-512Michael S2020/07/11 12:58 PM
      area and power cost of AVX-512Anon2020/07/11 04:35 PM
        area and power cost of AVX-512Michael S2020/07/12 04:16 AM
          area and power cost of AVX-512Travis Downs2020/07/12 09:13 AM
      area and power cost of AVX-512Travis Downs2020/07/11 07:19 PM
    Alder Lake and AVX-512Maynard Handley2020/07/11 02:02 PM
      Alder Lake and AVX-512Ungo2020/07/11 05:28 PM
        Alder Lake and AVX-512Maynard Handley2020/07/11 10:16 PM
      Alder Lake and AVX-512Linus Torvalds2020/07/11 06:51 PM
        Alder Lake and AVX-5122020/07/12 01:48 PM
          Alder Lake and AVX-512Michael S2020/07/12 03:07 PM
          HDRAnon32020/07/12 03:42 PM
            HDR10 in Kaby Lake?David Kanter2020/07/12 05:09 PM
              HDR10 in Kaby Lake?Maynard Handley2020/07/12 06:13 PM
                Thanks for the link (NT)David Kanter2020/07/12 06:43 PM
              HDR10 in Kaby Lake?Anon32020/07/13 01:36 AM
        Alder Lake and AVX-512Dummond D. Slow2020/07/12 03:00 PM
        AVX-512 with narrow ex units?m2020/07/23 12:10 PM
          AVX-512 with narrow ex units?Anon2020/07/23 12:53 PM
            AVX-512 with narrow ex units?Paul A. Clayton2020/07/23 06:32 PM
              AVX-512 with narrow ex units?Anon2020/07/23 06:50 PM
                AVX-512 with narrow ex units?Paul A. Clayton2020/07/23 07:45 PM
                  AVX-512 with narrow ex units?Anon2020/07/23 08:15 PM
                    AVX-512 with narrow ex units?Jukka Larja2020/07/24 04:44 AM
                      AVX-512 with narrow ex units?Gabriele Svelto2020/07/24 02:56 PM
                        AVX-512 with narrow ex units?Jouni Osmala2020/07/24 09:22 PM
                          AVX-512 with narrow ex units?Jukka Larja2020/07/25 01:32 AM
                      AVX-512 with narrow ex units?Eugene Nalimov2020/07/25 05:56 PM
                        AVX-512 with narrow ex units?Jukka Larja2020/07/26 01:28 AM
                        AVX-512 with narrow ex units?Gabriele Svelto2020/07/26 02:22 PM
                          AVX-512 with narrow ex units?Jukka Larja2020/07/27 07:00 AM
          AVX-512 with narrow ex units?-.-2020/07/23 06:32 PM
            AVX-512 with narrow ex units?Travis Downs2020/07/24 05:01 PM
    Alder Lake and AVX-512Jörn Engel2020/07/11 04:45 PM
      Alder Lake and AVX-512Chester2020/07/11 05:26 PM
        Alder Lake and AVX-512Jörn Engel2020/07/11 06:22 PM
        Alder Lake and AVX-512Michael S2020/07/12 02:02 AM
        Alder Lake and AVX-512Travis Downs2020/07/13 09:01 PM
      Alder Lake and AVX-512Linus Torvalds2020/07/11 06:54 PM
        Alder Lake and AVX-512Jörn Engel2020/07/11 08:01 PM
          Alder Lake and AVX-512N Owen2020/07/12 12:37 AM
            Alder Lake and AVX-512Michael S2020/07/12 01:48 AM
            Alder Lake and AVX-512anon22020/07/12 07:13 PM
          Alder Lake and AVX-512Travis Downs2020/07/13 09:09 PM
            Alder Lake and AVX-512Jörn Engel2020/07/13 11:42 PM
      Alder Lake and AVX-512Doug S2020/07/11 11:49 PM
        Alder Lake and AVX-512Michael S2020/07/12 01:53 AM
    Alder Lake and AVX-512Travis Downs2020/07/11 07:03 PM
      Alder Lake and AVX-512Veedrac2020/07/11 07:43 PM
        Alder Lake and AVX-512anon22020/07/12 01:31 AM
          Alder Lake and AVX-512Veedrac2020/07/12 04:01 AM
            Alder Lake and AVX-512anon22020/07/12 03:26 PM
              Alder Lake and AVX-512Anon32020/07/12 04:07 PM
                Alder Lake and AVX-512anon22020/07/12 05:39 PM
              Alder Lake and AVX-512Veedrac2020/07/12 04:21 PM
                Alder Lake and AVX-512anon22020/07/12 05:33 PM
                  Alder Lake and AVX-512Veedrac2020/07/12 05:54 PM
                    Alder Lake and AVX-512anon22020/07/12 06:20 PM
                  Alder Lake and AVX-512David Hess2020/07/12 07:32 PM
                    Alder Lake and AVX-512anon22020/07/12 08:41 PM
                Alder Lake and AVX-5122020/07/13 04:02 AM
                  Alder Lake and AVX-512anon22020/07/13 07:25 PM
                    PentiumMMX vs Transmeta's VLIW in hindsight2020/07/19 06:16 AM
                      PentiumMMX vs Transmeta's VLIW in hindsightMaynard Handley2020/07/19 10:47 AM
                      PentiumMMX vs Transmeta's VLIW in hindsightanon22020/07/19 03:24 PM
                      VLIW, OOO, Pairing, and FusionChester2020/07/19 10:16 PM
                        Poulson was in-order (NT)anon22020/07/20 12:20 AM
                        VLIW, OOO, Pairing, and FusionMichael S2020/07/20 12:48 AM
                        Itanium is NOT VLIWHeikki Kultala2020/07/20 02:27 PM
                          Itanium is NOT VLIWAdrian2020/07/20 11:03 PM
                            Itanium crappiness and EPIC - and could EPIC still have something good in it?Heikki Kultala2020/07/21 03:38 AM
                              Itanium crappiness and EPIC - and could EPIC still have something good in it?anon22020/07/21 05:03 AM
                                Itanium crappiness and EPIC - and could EPIC still have something good in it?dmcq2020/07/21 03:27 PM
                              Itanium crappiness and EPIC - and could EPIC still have something good in it?j2020/07/21 08:54 AM
                                Itanium crappiness and EPIC - and could EPIC still have something good in it?Tim McCaffrey2020/07/21 10:30 AM
                              Itanium crappiness and EPIC - and could EPIC still have something good in it?Linus Torvalds2020/07/21 09:13 AM
                                Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architectureHeikki Kultala2020/07/22 12:31 PM
                                  Turn that on its head?Ray2020/07/22 12:49 PM
                                    Turn that on its head?Anon2020/07/22 01:53 PM
                                    Turn that on its head?Maynard Handley2020/07/22 02:37 PM
                                    Turn that on its head?anon22020/07/22 03:32 PM
                                    Turn that on its head?anon32020/07/22 04:45 PM
                                    Turn that on its head?Heikki Kultala2020/07/23 02:53 AM
                                      Turn that on its head?Anon2020/07/23 10:20 AM
                                        Turn that on its head?Heikki Kultala2020/07/23 11:21 AM
                                          Turn that on its head?Brett2020/07/23 03:26 PM
                                            Turn that on its head?Brett2020/07/24 04:22 AM
                                      Bundling OOO entries does this implicitlyDavid Kanter2020/07/23 10:56 AM
                                      Turn that on its head?anon2020/07/23 11:49 AM
                                  Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architectureMaynard Handley2020/07/22 02:29 PM
                                  Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architecturewumpus2020/07/22 03:16 PM
                                    Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architectureDoug S2020/07/22 10:37 PM
                                      what Intel would have doneMichael S2020/07/23 12:46 AM
                                        what Intel would have doneDoug S2020/07/23 09:52 AM
                                        what Intel would have doneAnon2020/07/23 10:25 AM
                                          what Intel would have doneMichael S2020/07/23 11:23 AM
                                            what Intel would have doneMontaray Jack2020/07/23 06:08 PM
                                    Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architectureHeikki Kultala2020/07/22 11:47 PM
                                      Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architecturewumpus2020/07/23 01:46 PM
                                  Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architectureMichael S2020/07/23 12:56 AM
                                    Itanium is not synomym of EPIC. Itanium is just the most common EPIC-style architectureHeikki Kultala2020/07/23 02:44 AM
                          thanksChester2020/07/24 03:50 PM
      Alder Lake and AVX-512Linus Torvalds2020/07/11 07:46 PM
        Alder Lake and AVX-512never_released2020/07/11 08:54 PM
          Alder Lake and AVX-512Michael S2020/07/12 02:25 AM
        Alder Lake and AVX-512anon22020/07/12 01:36 AM
      Alder Lake and AVX-512Doug S2020/07/12 12:01 AM
      Alder Lake and AVX-512Michael S2020/07/12 02:41 AM
        Alder Lake and AVX-512rwessel2020/07/12 10:17 AM
      Alder Lake and AVX-512-.-2020/08/18 03:24 AM
        Alder Lake and AVX-512Travis Downs2020/08/18 11:04 PM
    Alder Lake and AVX-512Geoff Langdale2020/07/11 07:49 PM
      Alder Lake and AVX-512anon2020/07/11 08:12 PM
      Alder Lake and AVX-512Jörn Engel2020/07/11 08:33 PM
        Alder Lake and AVX-512Michael S2020/07/12 03:00 AM
        Alder Lake and AVX-512Jukka Larja2020/07/12 08:51 AM
          Alder Lake and AVX-512Maynard Handley2020/07/12 10:30 AM
            Alder Lake and AVX-512Jukka Larja2020/07/13 07:43 AM
              Alder Lake and AVX-512Montaray Jack2020/07/23 07:20 PM
                Alder Lake and AVX-512Jukka Larja2020/07/24 04:57 AM
          Alder Lake and AVX-512Jörn Engel2020/07/12 11:35 AM
            Alder Lake and AVX-512Linus Torvalds2020/07/12 12:01 PM
              Alder Lake and AVX-512Linus Torvalds2020/07/12 12:15 PM
                Alder Lake and AVX-512anonymou52020/07/12 01:50 PM
                  Alder Lake and AVX-512Linus Torvalds2020/07/12 02:31 PM
                    Alder Lake and AVX-512anonymou52020/07/12 03:09 PM
                      Alder Lake and AVX-512Linus Torvalds2020/07/12 04:25 PM
                        Alder Lake and AVX-512anonymou52020/07/12 08:34 PM
                          Alder Lake and AVX-512Jose2020/07/13 01:35 AM
                  Alder Lake and AVX-512gallier22020/07/13 02:11 AM
                Alder Lake and AVX-512gallier22020/07/13 02:01 AM
                  Alder Lake and AVX-512Linus Torvalds2020/07/13 11:06 AM
                    Alder Lake and AVX-512Doug S2020/07/13 12:11 PM
                      Alder Lake and AVX-512Brett2020/07/14 02:34 AM
                        Alder Lake and AVX-512Linus Torvalds2020/07/14 09:02 AM
                          Alder Lake and AVX-512Maynard Handley2020/07/14 12:40 PM
                            Alder Lake and AVX-512Michael S2020/07/14 12:48 PM
                            Alder Lake and AVX-512Linus Torvalds2020/07/15 01:37 AM
                              OS X file names normalizationMichael S2020/07/15 02:26 AM
                                OS X file names normalizationSimon Farnsworth2020/07/15 04:16 AM
                                  OS X file names normalizationMichael S2020/07/15 10:51 AM
                                    OS X file names normalizationSimon Farnsworth2020/07/15 12:27 PM
                                OS X file names normalizationDoug S2020/07/15 10:46 AM
                                  OS X file names normalizationMichael S2020/07/15 11:05 AM
                                    OS X file names normalizationLinus Torvalds2020/07/15 12:58 PM
                                      OS X file names normalizationLinus Torvalds2020/07/15 02:21 PM
                                      OS X file names normalizationgallier22020/07/15 11:57 PM
                                    OS X file names normalizationgallier22020/07/15 11:44 PM
                                  OS X file names normalizationRob Thorpe2020/07/15 11:23 AM
                                    OS X file names normalizationDoug S2020/07/15 01:32 PM
                                      OS X file names normalizationMaynard Handley2020/07/15 05:20 PM
                                        OS X file names normalizationLinus Torvalds2020/07/15 08:37 PM
                                          OS X file names normalizationAnon32020/07/16 01:43 PM
                                            OS X file names normalizationDoug S2020/07/16 03:38 PM
                                              OS X file names normalizationLinus Torvalds2020/07/17 12:21 AM
                                                OS X file names normalizationAnon32020/07/17 02:15 AM
                                                  OS X file names normalizationJukka Larja2020/07/17 06:40 AM
                                                OS X file names normalizationgallier22020/07/17 03:19 AM
                                                  OS X file names normalizationLinus Torvalds2020/07/17 09:41 AM
                                                    OS X file names normalizationDummond D. Slow2020/07/17 09:54 AM
                                                      OS X file names normalizationLinus Torvalds2020/07/17 10:16 AM
                                                      OS X file names normalizationSimon Farnsworth2020/07/18 06:12 AM
                                              OS X file names normalizationAnon32020/07/17 02:04 AM
                                                OS X file names normalizationDoug S2020/07/17 10:15 AM
                              Alder Lake and AVX-512Maynard Handley2020/07/15 10:32 AM
                            File Systems and VC ProblemsRob Thorpe2020/07/15 07:24 AM
                    vectorization of utf8Robert David Graham2020/07/13 02:36 PM
                      vectorization of utf8anon22020/07/13 05:07 PM
                        vectorization of utf8Robert David Graham2020/07/13 08:36 PM
                          vectorization of utf8anon22020/07/13 11:23 PM
                        vectorization of utf8Maynard Handley2020/07/13 10:46 PM
                      vectorization of utf8Gabriele Svelto2020/07/15 03:27 AM
                    Alder Lake and AVX-512gallier22020/07/14 01:13 AM
              Alder Lake and AVX-512Jörn Engel2020/07/12 01:29 PM
                Alder Lake and AVX-512Linus Torvalds2020/07/12 02:08 PM
                  Alder Lake and AVX-512Jörn Engel2020/07/12 06:26 PM
                    Alder Lake and AVX-512-.-2020/07/12 07:11 PM
                      Alder Lake and AVX-512Jörn Engel2020/07/12 07:43 PM
            Alder Lake and AVX-512Jukka Larja2020/07/13 08:38 AM
              Alder Lake and AVX-512Jörn Engel2020/07/13 10:10 AM
                Alder Lake and AVX-512Michael S2020/07/13 11:02 AM
                  Alder Lake and AVX-512Jörn Engel2020/07/13 11:22 AM
                    Alder Lake and AVX-512Michael S2020/07/13 12:10 PM
                      Alder Lake and AVX-512Jörn Engel2020/07/13 04:03 PM
                Alder Lake and AVX-512Jukka Larja2020/07/14 06:53 AM
      Alder Lake and AVX-512Linus Torvalds2020/07/11 08:34 PM
        Alder Lake and AVX-512Brett2020/07/11 09:02 PM
          Alder Lake and AVX-512David Hess2020/07/13 12:36 PM
            Alder Lake and AVX-512anonymou52020/07/13 01:01 PM
              Alder Lake and AVX-512Brett2020/07/13 04:19 PM
        Alder Lake and AVX-512Geert2020/07/11 09:36 PM
          AMD's FPUChester2020/07/12 02:28 AM
            Is 3|5 lower than 4?Michael S2020/07/12 03:59 AM
              Is 3|5 lower than 4?Chester2020/07/12 05:54 AM
        Alder Lake and AVX-512Geoff Langdale2020/07/11 11:45 PM
          Alder Lake and AVX-512me2020/07/12 03:44 AM
          Alder Lake and AVX-512Michael S2020/07/12 04:09 AM
          Alder Lake and AVX-512Linus Torvalds2020/07/12 11:35 AM
            ~80% of details are wrong. So what one can expect from conclusions? :( (NT)Michael S2020/07/12 11:57 AM
              ~80% of details are wrong. So what one can expect from conclusions? :(anonymous22020/07/12 12:50 PM
            Alder Lake and AVX-512nobody in particular2020/07/12 12:25 PM
              Alder Lake and AVX-512Linus Torvalds2020/07/12 12:37 PM
                Alder Lake and AVX-512nobody in particular2020/07/12 12:43 PM
                  Alder Lake and AVX-512me2020/07/12 01:32 PM
                    Alder Lake and AVX-512Maynard Handley2020/07/12 08:51 PM
            Alder Lake and AVX-512UnmaskedUnderflow2020/07/12 12:33 PM
            AVX-512 vs SVE2-.-2020/07/12 06:22 PM
              AVX-512 vs SVE2noko2020/07/13 12:12 AM
                AVX-512 vs SVE2-.-2020/07/13 04:00 AM
            Alder Lake and AVX-512Geoff Langdale2020/07/12 08:18 PM
              Could you please stop top-posting (NT)Jukka Larja2020/07/13 08:45 AM
              Alder Lake and AVX-512Romain Dolbeau2020/07/15 01:00 AM
            Alder Lake and AVX-512Spiteful Sprites2020/07/13 04:59 AM
              Alder Lake and AVX-512nobody in particular2020/07/13 09:12 AM
                Alder Lake and AVX-512Spiteful Sprites2020/07/13 04:21 PM
                  Alder Lake and AVX-512Jouni Osmala2020/07/14 02:55 AM
                  RISC-V & commercial support (was: Alder Lake and AVX-512)Romain Dolbeau2020/07/15 01:11 AM
                    RISC-V & commercial support (was: Alder Lake and AVX-512)Romain Dolbeau2020/07/15 01:13 AM
              Alder Lake and AVX-512Linus Torvalds2020/07/13 11:10 AM
            AVX-512/SVE & HPC (was: Alder Lake and AVX-512)Romain Dolbeau2020/07/14 10:09 AM
              AVX-512/SVE & HPC (was: Alder Lake and AVX-512)anon2020/07/14 10:53 AM
                AVX-512/SVE & HPC (was: Alder Lake and AVX-512)Romain Dolbeau2020/07/14 11:27 AM
                  AVX-512/SVE & HPC (was: Alder Lake and AVX-512)Maynard Handley2020/07/14 12:52 PM
                  AVX-512/SVE & HPC (was: Alder Lake and AVX-512)Doug S2020/07/14 01:43 PM
                  AVX-512/SVE & HPC (was: Alder Lake and AVX-512)anon2020/07/14 03:01 PM
              AVX-512/SVE & HPC (was: Alder Lake and AVX-512)Linus Torvalds2020/07/14 12:00 PM
                AVX-512/SVE & HPC (was: Alder Lake and AVX-512)Romain Dolbeau2020/07/14 11:42 PM
                  Configurable cache line size?Doug S2020/07/15 10:56 AM
                    Configurable cache line size?dmcq2020/07/15 03:43 PM
                    Configurable cache line size?Romain Dolbeau2020/07/15 11:37 PM
                    Configurable cache line size?NoSpammer2020/07/16 01:27 AM
                    Configurable cache line size?Pixie2020/07/16 10:55 AM
                      Configurable cache line size?Etienne2020/07/17 01:03 AM
                        Configurable cache line size?Hugo Décharnes2020/07/18 02:11 AM
                  Cache line sizeMark Roulo2020/07/15 06:10 PM
                    Cache line sizeanon2020/07/15 06:46 PM
                  AVX-512/SVE & HPC (was: Alder Lake and AVX-512)Gabriele Svelto2020/07/17 02:30 AM
                    AVX-512/SVE & HPC (was: Alder Lake and AVX-512)dmcq2020/07/17 03:34 AM
                      AVX-512/SVE & HPC (was: Alder Lake and AVX-512)zArchJon2020/07/17 01:16 PM
            Macro-instructions to the rescue2020/07/24 12:56 PM
              Some fundamentals haven't changedChester2020/07/24 03:59 PM
                Some fundamentals haven't changed2020/07/24 04:24 PM
                  Some fundamentals haven't changeddmcq2020/07/25 07:58 AM
                    Some fundamentals haven't changed2020/07/25 11:05 AM
                    Some fundamentals haven't changedBrett2020/07/25 02:16 PM
                      Some fundamentals haven't changedBrett2020/07/25 02:27 PM
                      What belt is.Heikki Kultala2020/07/26 07:49 AM
                        What belt is.Michael S2020/07/26 10:00 AM
                          What belt is.Brett2020/07/26 11:46 PM
                            What belt is.Michael S2020/07/27 12:52 AM
                              What belt is.Brett2020/07/27 07:25 AM
                                What belt is.Doug S2020/07/27 01:31 PM
                                  What belt is.Andrew Clough2020/07/28 06:11 AM
                                    What belt is.dmcq2020/07/28 08:17 AM
                                      Mill Compiler still MIA?Geoff Langdale2020/07/28 05:04 PM
                                        If they release the compiler, how they will blame the still-in-development compiler for the lacklust (NT)Anon2020/07/28 05:20 PM
                                          If they release the compiler, how they will blame the still-in-development compiler for the lacklustAnon2020/07/28 05:20 PM
                                        Apparently they're busy writing a kernel...Anon2020/07/29 03:03 AM
                                          Apparently they're busy writing a kernel...dmcq2020/07/29 03:39 AM
                        What belt is.2020/07/26 11:44 AM
                          What belt is.anonymous22020/07/26 12:02 PM
                            What belt is.Doug S2020/07/26 03:26 PM
                              What belt is.2020/07/26 04:02 PM
        gooduseruser2020/07/12 10:06 AM
      Alder Lake and AVX-512-.-2020/07/11 09:03 PM
        Alder Lake and AVX-512-.-2020/07/11 09:07 PM
      Alder Lake and AVX-512j2020/07/13 12:29 AM
        Alder Lake and AVX-512Michael S2020/07/13 01:12 AM
          Alder Lake and AVX-512j2020/07/13 02:58 AM
            Alder Lake and AVX-512dmcq2020/07/13 04:53 PM
              Alder Lake and AVX-512Michael S2020/07/14 12:57 AM
                Alder Lake and AVX-512Maynard Handley2020/07/14 10:26 AM
                Alder Lake and AVX-512dmcq2020/07/14 12:33 PM
                  Alder Lake and AVX-512dmcq2020/07/14 03:43 PM
                    Alder Lake and AVX-512Michael S2020/07/15 12:55 AM
                      Alder Lake and AVX-512dmcq2020/07/15 02:19 AM
                        Alder Lake and AVX-512Michael S2020/07/15 02:34 AM
                          Alder Lake and AVX-512dmcq2020/07/15 03:03 AM
                            Alder Lake and AVX-512Michael S2020/07/15 09:43 AM
                              Alder Lake and AVX-512dmcq2020/07/15 09:54 AM
                                Alder Lake and AVX-512Michael S2020/07/15 11:35 AM
                                  Alder Lake and AVX-512dmcq2020/07/15 03:18 PM
                                    GV100 + POWER9Michael S2020/07/16 01:17 AM
                                      GV100 + POWER9dmcq2020/07/16 08:58 AM
                                        GV100 + POWER9dmcq2020/07/16 09:10 AM
                        Alder Lake and AVX-512dmcq2020/07/15 02:48 AM
    Alder Lake and AVX-512o2020/07/12 03:08 AM
    Alder Lake and AVX-5122020/07/12 11:07 AM
      Alder Lake and AVX-5122020/07/12 11:32 AM
      Alder Lake and AVX-512Linus Torvalds2020/07/12 11:39 AM
        Alder Lake and AVX-5122020/07/12 12:47 PM
        Alder Lake and AVX-512Michael S2020/07/12 01:18 PM
          x87 crapHeikki Kultala2020/07/12 01:30 PM
            x87 crapMichael S2020/07/12 01:37 PM
              x87 crapHeikki kultala2020/07/12 02:11 PM
                x87 crapMichael S2020/07/12 02:50 PM
                  Sparc and PA-RISC vs pentium FP performanceHeikki Kultala2020/07/13 01:14 AM
                    Sparc and PA-RISC vs pentium FP performanceanonymous22020/07/13 10:48 AM
          Alder Lake and AVX-512Doug S2020/07/12 03:33 PM
            Alder Lake and AVX-512Michael S2020/07/12 04:10 PM
    Alder Lake and AVX-512David Kanter2020/07/12 05:01 PM
      Alder Lake and AVX-512anon2020/07/12 05:40 PM
      ~0% of users do much FP outside of GPUs for games (NT)anonymous22020/07/12 05:47 PM
        ~0% of users do much FP outside of GPUs for gamesMaynard Handley2020/07/13 12:26 AM
        not trueChester2020/07/13 12:37 AM
          not trueMichael S2020/07/13 01:29 AM
            not trueChester2020/07/13 01:59 AM
              not trueanonymous22020/07/13 10:32 AM
                not trueMaynard Handley2020/07/13 02:30 PM
                  not trueChester2020/07/14 05:47 AM
            not trueDoug S2020/07/13 12:30 PM
              not trueAnon2020/07/13 01:16 PM
                not trueMaynard Handley2020/07/13 02:39 PM
              not trueMaynard Handley2020/07/13 02:38 PM
          not trueLinus Torvalds2020/07/13 11:27 AM
            not trueDummond D. Slow2020/07/13 02:10 PM
              not trueMaynard Handley2020/07/13 02:49 PM
                not trueDummond D. Slow2020/07/13 03:38 PM
            not true (about FP, not avx-512)Chester2020/07/17 10:37 AM
  Alder Lake and AVX-512Travis Downs2020/07/11 06:45 PM
    Alder Lake and AVX-512-.-2020/07/11 06:57 PM
      Alder Lake and AVX-512-.-2020/07/12 04:26 PM
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