Latency and HPC Workloads - Why not SRAM?

Article: Intel's Near-Threshold Voltage Computing and Applications
By: forestlaughing (forestlaughing.delete@this.yahoo.com), October 15, 2012 7:02 am
Room: Moderated Discussions
Robert Myers (rbmyersusa.delete@this.gmail.com) on October 10, 2012 10:11 am wrote:
> The hidden figure of merit
> apparently driving all HPC decisions is Linpack flops/$. There is really little
> point in discussing anything else. I've given up. The field is owned by bean
> counters and self-promoters.

And you wouldn't know anything about self promotion, would you Robert? ;)

Linpack flops/$ certainly fills up more HPC mindshare than it deserves, but it's not the only driving factor. When RFPs go out for large procurements, they usually come with a list of about 10 applications, and the required performance levels for each of those applications. Most HPC sites pick their 10 most frequently run applications, or highest profile users, and use those applications for their criteria. If your application is one of those, great. If not, it kinda sucks.

There are a few odd-ball applications, very far from the linpack model, that do get their needs met. Cray builds their full-custom multithreaded machine for the spooks, in order to do their graph algorithm stuff. IBM has a weird bit-matrix machine thing, also for the spooks. NEC still sells vector machines, though it's not clear if they will continue doing so. The trick is that it takes a LOT of money to get a full custom machine, and the rest of the HPC world has to live with what is economically viable.

This is not to say that everyone else is completely up the creek. If you have a half million dollars, and can solve your particular problem with an fpga, or have few million dollars, and can fit your solution on a 45nm asic, you can create custom processors. Periodically universities are out there, presenting these designs at hotchips, or similar venues. Most of the time, these don't provide enough advantage over a xeon, to justify the exercise, but for some applications they do.
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TopicPosted ByDate
New article: Intel's Near-Threshold ComputingDavid Kanter2012/09/18 11:26 AM
  Higher SRAM voltage and shared L1Paul A. Clayton2012/09/18 01:38 PM
    Higher SRAM voltage and shared L1David Kanter2012/09/18 04:20 PM
      Higher SRAM voltage and shared L1Eric2012/09/20 09:44 AM
        Higher SRAM voltage and shared L1David Kanter2012/09/20 11:24 AM
      Yes, that kind of asynchronousPaul A. Clayton2012/09/20 01:53 PM
    Higher SRAM voltage and shared L1somebody2012/09/19 08:27 AM
      So micro-turboboost is doubly impracticalPaul A. Clayton2012/09/20 01:53 PM
  Big littleDoug S2012/09/18 02:04 PM
    Big littleDavid Kanter2012/09/18 03:05 PM
    Big littleRicardo B2012/09/19 03:06 AM
  New article: Intel's Near-Threshold Computingdefderdar2012/09/18 08:39 PM
    New article: Intel's Near-Threshold Computingtarlinian2012/09/19 07:32 AM
      New article: Intel's Near-Threshold ComputingDavid Kanter2012/09/19 09:44 AM
  New article: Intel's Near-Threshold ComputingMark Christiansen2012/09/19 10:31 AM
    New article: Intel's Near-Threshold ComputingChris Brodersen2012/09/19 11:54 AM
  New article: Intel's Near-Threshold ComputingEric2012/09/20 09:47 AM
  Latency and HPC WorkloadsRobert Myers2012/10/03 09:52 AM
    Latency and HPC Workloadsanon2012/10/03 05:50 PM
      Latency and HPC WorkloadsRobert Myers2012/10/04 09:24 AM
        Latency and HPC WorkloadsSHK2012/10/08 04:42 AM
          Latency and HPC WorkloadsMichael S2012/10/08 12:59 PM
            Latency and HPC WorkloadsSHK2012/10/08 01:42 PM
              Latency and HPC WorkloadsMichael S2012/10/08 04:12 PM
                Latency and HPC Workloadsforestlaughing2012/10/15 07:41 AM
                  The original context was Micron RLDRAM (NT)Michael S2012/10/15 07:55 AM
                    The original context was Micron RLDRAMforestlaughing2012/10/15 09:21 AM
              Latency and HPC Workloads - Why not SRAM?Kevin G2012/10/09 08:48 AM
                Latency and HPC Workloads - Why not SRAM?Michael S2012/10/09 09:33 AM
                  Latency and HPC Workloads - Why not SRAM?SHK2012/10/09 11:55 AM
                    Why not SRAM? - CapacityRohit2012/10/09 08:13 PM
                  Latency and HPC Workloads - Why not SRAM?Kevin G2012/10/09 02:04 PM
                    Latency and HPC Workloads - Why not SRAM?Michael S2012/10/09 03:52 PM
                      Latency and HPC Workloads - Why not SRAM?Robert Myers2012/10/10 09:11 AM
                        Latency and HPC Workloads - Why not SRAM?forestlaughing2012/10/15 07:02 AM
                          Latency and HPC Workloads - Why not SRAM?Robert Myers2012/10/15 08:04 AM
                            Latency and HPC Workloads - Why not SRAM?forestlaughing2012/10/16 08:13 AM
                          Latency and HPC Workloads - Why not SRAM?SHK2012/10/16 07:12 AM
                    Latency and HPC Workloads - Why not SRAM?slacker2012/10/11 12:35 PM
                      SRAM leakageDavid Kanter2012/10/11 02:00 PM
          Latency and HPC Workloadsforestlaughing2012/10/15 07:57 AM
            Latency and HPC WorkloadsRobert Myers2012/10/16 06:28 AM
              Latency and HPC WorkloadsMichael S2012/10/16 06:35 AM
              Latency and HPC Workloadsanon2012/10/16 07:17 AM
                Latency and HPC WorkloadsRobert Myers2012/10/16 08:56 AM
                  Supercomputer variant of Kahan quotePaul A. Clayton2012/10/16 10:09 AM
                    Supercomputer variant of Kahan quoteanon2012/10/17 12:17 AM
                      Supercomputer variant of Kahan quoteRobert Myers2012/10/17 03:34 AM
                        Supercomputer variant of Kahan quoteanon2012/10/17 04:12 AM
                          Supercomputer variant of Kahan quoteRobert Myers2012/10/17 01:38 PM
                            Supercomputer variant of Kahan quoteanon2012/10/17 04:24 PM
                              Supercomputer variant of Kahan quoteRobert Myers2012/10/17 04:45 PM
                                Supercomputer variant of Kahan quoteanon2012/10/17 04:58 PM
                                Supercomputer variant of Kahan quoteanon2012/10/17 04:58 PM
                                  Supercomputer variant of Kahan quoteRobert Myers2012/10/17 06:14 PM
                                    Supercomputer variant of Kahan quoteanon2012/10/17 07:36 PM
                                      Supercomputer variant of Kahan quoteRobert Myers2012/10/18 08:47 AM
                                        Supercomputer variant of Kahan quoteanon2012/10/19 01:34 AM
                                          Supercomputer variant of Kahan quoteanon2012/10/19 03:47 AM
                                          Supercomputer variant of Kahan quoteRobert Myers2012/10/19 02:14 PM
                        Supercomputer variant of Kahan quoteMichael S2012/10/17 05:56 PM
                          Supercomputer variant of Kahan quoteanon2012/10/17 08:02 PM
                            Supercomputer variant of Kahan quoteRobert Myers2012/10/18 12:29 PM
                              Supercomputer variant of Kahan quoteanon2012/10/19 01:27 AM
                                Supercomputer variant of Kahan quoteRobert Myers2012/10/19 06:24 AM
                                  Supercomputer variant of Kahan quoteanon2012/10/19 07:00 AM
                                    Supercomputer variant of Kahan quoteRobert Myers2012/10/19 08:28 AM
                                      Supercomputer variant of Kahan quoteanon2012/10/19 09:27 AM
                              Supercomputer variant of Kahan quoteforestlaughing2012/10/19 09:26 AM
                                Supercomputer variant of Kahan quoteRobert Myers2012/10/19 06:04 PM
                                  Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 03:52 AM
                                    Supercomputer variant of Kahan quoteRobert Myers2012/10/20 06:51 AM
                                      Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 07:33 AM
                                        Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 07:34 AM
                                          Supercomputer variant of Kahan quoteRobert Myers2012/10/20 08:35 AM
                                            Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 09:04 AM
                                              Supercomputer variant of Kahan quoteRobert Myers2012/10/20 10:23 AM
                  Latency and HPC Workloadsanon2012/10/16 05:48 PM
                    Latency and HPC Workloadsforestlaughing2012/10/19 10:43 AM
              Latency and HPC Workloadsforestlaughing2012/10/19 08:38 AM
                Latency and HPC WorkloadsRobert Myers2012/10/19 10:40 AM
                Potential false economics in researchPaul A. Clayton2012/10/19 11:54 AM
                  Potential false economics in researchVincent Diepeveen2012/10/20 07:59 AM
                  Potential false economics in researchforestlaughing2012/10/23 09:56 AM
                    Potential false economics in researchRobert Myers2012/10/23 06:16 PM
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