Haskell Compilation Improvement

By: Maynard Handley (name99.delete@this.redheron9.com), December 31, 2013 7:49 pm
Room: Moderated Discussions
TREZA (no.delete@this.ema.il) on December 31, 2013 5:44 pm wrote:
> Maynard Handley (name99.delete@this.redheron9.com) on December 31, 2013 5:26 pm wrote:
> > Meanwhile as a dark horse in the prefetching world, there is Yale Patt's favorite idea of abandoning
> > the attempt at more and more aggressive OoO and switching to runahead computing, as in, e.g.
> > http://users.ece.cmu.edu/~omutlu/pub/mutlu_ieee_micro06_submitted.pdf
> > I personally would not be surprised to see this idea popup implemented in ARM. Basically
> > it's (IMHO) a way to do the same sort of amount of work as implementing SMT, but in a
> > way that actually achieves something useful for most code. (While, for ARM the CPUs are
> > so small that if you want more SMP, you might as well just replicate the cores.)
>
> Is it like the late Sun ROCK CPU ? Scout threads, speculative instruction retiring...
>
> It was abandoned as an overheating, slow chip.

It does seem like the same idea. But I don't think we know enough about Rock to conclude that it's a bad idea. We know that Rock was frequently delayed, which may just be a sign of poor management, or that it was generally too ambitious. And that ambition may have failed not in the runahead computing but in the HWTM, or in the attempting to share resources (I & D cache, FPU) between cores, or in trying to fit too much onto the chip.

We know that the chip was abandoned shortly after Oracle bought Sun, and we know that Ellison claimed that it was abandoned because ran hot and slow. But we don't, as far as I know, have independent confirmation of this claim (after all, Ellison had his own agenda and vision for Sun once it became part of Oracle) or any insight into the extent to which what Ellison was seeing as slow and hot was in fact not the final chip but, e.g., some sort of FPGA version being used to verify the design.
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TopicPosted ByDate
Haskell Compilation ImprovementSymmetry2013/04/09 10:41 AM
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  Haskell Compilation ImprovementLinus Torvalds2013/04/09 12:03 PM
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        Haskell Compilation ImprovementEduardoS2013/04/09 12:49 PM
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        Haskell Compilation ImprovementBrendan2013/04/11 07:06 AM
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            Haskell Compilation ImprovementBrendan2013/04/11 11:31 AM
          Haskell Compilation ImprovementEric Bron2013/04/11 08:57 AM
            Haskell Compilation ImprovementBrendan2013/04/11 11:26 AM
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                Haskell Compilation ImprovementBrendan2013/04/11 05:00 PM
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                      Haskell Compilation ImprovementEric Bron2013/04/12 12:15 PM
                        Haskell Compilation ImprovementBrendan2013/04/12 03:34 PM
                          Haskell Compilation ImprovementEric Bron2013/04/12 10:44 PM
                            Haskell Compilation ImprovementBrendan2013/04/13 02:20 AM
                              Haskell Compilation ImprovementEric Bron2013/04/13 02:32 AM
                                Haskell Compilation ImprovementBrendan2013/04/13 10:18 AM
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                          Haskell Compilation ImprovementEric Bron2013/04/15 08:34 AM
                            Haskell Compilation ImprovementBrendan2013/04/16 03:26 PM
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        Haskell Compilation Improvementanon2013/04/11 07:14 AM
          Haskell Compilation ImprovementMichael S2013/04/11 07:27 AM
            Haskell Compilation Improvementanon2013/04/11 08:25 AM
              Haskell Compilation ImprovementMichael S2013/04/11 08:37 AM
                Haskell Compilation Improvementbakaneko2013/04/11 09:39 AM
                  Haskell Compilation ImprovementEric Bron2013/04/11 10:08 AM
                    Haskell Compilation Improvementbakaneko2013/04/11 10:36 AM
                    Haskell Compilation Improvementanon2013/04/11 10:54 AM
                      Haskell Compilation ImprovementEric Bron2013/04/11 11:10 AM
                        Haskell Compilation Improvementanon2013/04/11 11:18 AM
                          Haskell Compilation ImprovementEric Bron2013/04/11 11:27 AM
                            Haskell Compilation Improvementanon2013/04/11 12:02 PM
                              Haskell Compilation ImprovementEric Bron2013/04/11 12:09 PM
                                Haskell Compilation ImprovementEric Bron2013/04/11 12:12 PM
                                Haskell Compilation Improvementanon2013/04/11 12:14 PM
                                  Haskell Compilation ImprovementEric Bron2013/04/11 12:30 PM
                                    Haskell Compilation Improvementanon2013/04/11 11:30 PM
                                      Haskell Compilation ImprovementEric Bron2013/04/12 09:25 AM
                                        Haskell Compilation Improvementanon2013/04/12 07:12 PM
                                          Haskell Compilation ImprovementEric Bron2013/04/12 10:51 PM
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                        Haskell Compilation ImprovementLinus Torvalds2013/04/11 12:56 PM
                          Inherent advantage of software prefetchJouni Osmala2013/04/11 09:41 PM
                            Inherent advantage of software prefetchSeni2013/04/13 03:40 AM
                            Another example: software scatter gather (NT)Megol2013/04/14 02:39 AM
                          Haskell Compilation ImprovementMaynard Handley2013/12/31 05:26 PM
                            Haskell Compilation ImprovementTREZA2013/12/31 05:44 PM
                              Haskell Compilation ImprovementMaynard Handley2013/12/31 07:49 PM
                                Haskell Compilation Improvementanon2013/12/31 10:39 PM
                                  Haskell Compilation ImprovementMaynard Handley2014/01/01 02:04 AM
                                  Haskell Compilation Improvementbakaneko2014/01/01 05:31 AM
                                Haskell Compilation ImprovementGabriele Svelto2014/01/02 07:57 AM
                                  Haskell Compilation ImprovementMichael S2014/01/02 08:37 AM
                                    Haskell Compilation ImprovementGabriele Svelto2014/01/02 10:09 AM
                                    Haskell Compilation ImprovementTREZA2014/01/02 12:43 PM
                            Haskell Compilation ImprovementMaynard Handley2013/12/31 06:07 PM
                            Future core architectures. (Was Haskell Compilation Improvement)Maynard Handley2014/01/03 12:06 AM
                              Speculative multi-threadingDavid Kanter2014/01/03 02:12 AM
                                Speculative multi-threadingMaynard Handley2014/01/03 05:01 AM
                              Future core architectures. (Was Haskell Compilation Improvement)Seni2014/01/03 01:09 PM
                              Future core architectures. (Was Haskell Compilation Improvement)Linus Torvalds2014/01/03 01:27 PM
                            Haskell Compilation ImprovementKonrad Schwarz2014/01/04 09:38 AM
              Haskell Compilation ImprovementEric Bron2013/04/11 09:23 AM
          Haskell Compilation ImprovementEric Bron2013/04/11 08:50 AM
            Haskell Compilation ImprovementEugene Nalimov2013/04/11 09:20 AM
              Haskell Compilation ImprovementEric Bron2013/04/11 09:28 AM
                Haskell Compilation ImprovementEduardoS2013/04/11 07:30 PM
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              Haskell Compilation ImprovementEric Bron2013/04/11 10:30 AM
                Haskell Compilation Improvementanon2013/04/11 10:50 AM
                  Haskell Compilation ImprovementEric Bron2013/04/11 11:03 AM
                    Haskell Compilation Improvementanon2013/04/11 11:16 AM
                      Haskell Compilation ImprovementEric Bron2013/04/11 11:24 AM
                        Haskell Compilation Improvementanon2013/04/11 12:09 PM
                          Haskell Compilation ImprovementEric Bron2013/04/11 12:43 PM
                            Haskell Compilation Improvementanon2013/04/11 11:27 PM
                              Haskell Compilation ImprovementEric Bron2013/04/12 12:15 AM
                                Haskell Compilation Improvementanon2013/04/12 07:14 PM
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                        Haskell Compilation Improvementanon2013/04/11 10:42 PM
                        Haskell Compilation ImprovementRobert David Graham2013/04/12 02:12 PM
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          Software prefetch architectureEric Bron2013/04/11 09:06 AM
            Software prefetch architectureMegol2013/04/15 11:03 AM
              Software prefetch architectureEric Bron2013/04/15 11:30 AM
  low barMichael S2013/04/09 04:38 PM
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