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 8:02 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 Kanter09/18/12 12:26 PM
  Higher SRAM voltage and shared L1Paul A. Clayton09/18/12 02:38 PM
    Higher SRAM voltage and shared L1David Kanter09/18/12 05:20 PM
      Higher SRAM voltage and shared L1Eric09/20/12 10:44 AM
        Higher SRAM voltage and shared L1David Kanter09/20/12 12:24 PM
      Yes, that kind of asynchronousPaul A. Clayton09/20/12 02:53 PM
    Higher SRAM voltage and shared L1somebody09/19/12 09:27 AM
      So micro-turboboost is doubly impracticalPaul A. Clayton09/20/12 02:53 PM
  Big littleDoug S09/18/12 03:04 PM
    Big littleDavid Kanter09/18/12 04:05 PM
    Big littleRicardo B09/19/12 04:06 AM
  New article: Intel's Near-Threshold Computingdefderdar09/18/12 09:39 PM
    New article: Intel's Near-Threshold Computingtarlinian09/19/12 08:32 AM
      New article: Intel's Near-Threshold ComputingDavid Kanter09/19/12 10:44 AM
  New article: Intel's Near-Threshold ComputingMark Christiansen09/19/12 11:31 AM
    New article: Intel's Near-Threshold ComputingChris Brodersen09/19/12 12:54 PM
  New article: Intel's Near-Threshold ComputingEric09/20/12 10:47 AM
  Latency and HPC WorkloadsRobert Myers10/03/12 10:52 AM
    Latency and HPC Workloadsanon10/03/12 06:50 PM
      Latency and HPC WorkloadsRobert Myers10/04/12 10:24 AM
        Latency and HPC WorkloadsSHK10/08/12 05:42 AM
          Latency and HPC WorkloadsMichael S10/08/12 01:59 PM
            Latency and HPC WorkloadsSHK10/08/12 02:42 PM
              Latency and HPC WorkloadsMichael S10/08/12 05:12 PM
                Latency and HPC Workloadsforestlaughing10/15/12 08:41 AM
                  The original context was Micron RLDRAM (NT)Michael S10/15/12 08:55 AM
                    The original context was Micron RLDRAMforestlaughing10/15/12 10:21 AM
              Latency and HPC Workloads - Why not SRAM?Kevin G10/09/12 09:48 AM
                Latency and HPC Workloads - Why not SRAM?Michael S10/09/12 10:33 AM
                  Latency and HPC Workloads - Why not SRAM?SHK10/09/12 12:55 PM
                    Why not SRAM? - CapacityRohit10/09/12 09:13 PM
                  Latency and HPC Workloads - Why not SRAM?Kevin G10/09/12 03:04 PM
                    Latency and HPC Workloads - Why not SRAM?Michael S10/09/12 04:52 PM
                      Latency and HPC Workloads - Why not SRAM?Robert Myers10/10/12 10:11 AM
                        Latency and HPC Workloads - Why not SRAM?forestlaughing10/15/12 08:02 AM
                          Latency and HPC Workloads - Why not SRAM?Robert Myers10/15/12 09:04 AM
                            Latency and HPC Workloads - Why not SRAM?forestlaughing10/16/12 09:13 AM
                          Latency and HPC Workloads - Why not SRAM?SHK10/16/12 08:12 AM
                    Latency and HPC Workloads - Why not SRAM?slacker10/11/12 01:35 PM
                      SRAM leakageDavid Kanter10/11/12 03:00 PM
          Latency and HPC Workloadsforestlaughing10/15/12 08:57 AM
            Latency and HPC WorkloadsRobert Myers10/16/12 07:28 AM
              Latency and HPC WorkloadsMichael S10/16/12 07:35 AM
              Latency and HPC Workloadsanon10/16/12 08:17 AM
                Latency and HPC WorkloadsRobert Myers10/16/12 09:56 AM
                  Supercomputer variant of Kahan quotePaul A. Clayton10/16/12 11:09 AM
                    Supercomputer variant of Kahan quoteanon10/17/12 01:17 AM
                      Supercomputer variant of Kahan quoteRobert Myers10/17/12 04:34 AM
                        Supercomputer variant of Kahan quoteanon10/17/12 05:12 AM
                          Supercomputer variant of Kahan quoteRobert Myers10/17/12 02:38 PM
                            Supercomputer variant of Kahan quoteanon10/17/12 05:24 PM
                              Supercomputer variant of Kahan quoteRobert Myers10/17/12 05:45 PM
                                Supercomputer variant of Kahan quoteanon10/17/12 05:58 PM
                                Supercomputer variant of Kahan quoteanon10/17/12 05:58 PM
                                  Supercomputer variant of Kahan quoteRobert Myers10/17/12 07:14 PM
                                    Supercomputer variant of Kahan quoteanon10/17/12 08:36 PM
                                      Supercomputer variant of Kahan quoteRobert Myers10/18/12 09:47 AM
                                        Supercomputer variant of Kahan quoteanon10/19/12 02:34 AM
                                          Supercomputer variant of Kahan quoteanon10/19/12 04:47 AM
                                          Supercomputer variant of Kahan quoteRobert Myers10/19/12 03:14 PM
                        Supercomputer variant of Kahan quoteMichael S10/17/12 06:56 PM
                          Supercomputer variant of Kahan quoteanon10/17/12 09:02 PM
                            Supercomputer variant of Kahan quoteRobert Myers10/18/12 01:29 PM
                              Supercomputer variant of Kahan quoteanon10/19/12 02:27 AM
                                Supercomputer variant of Kahan quoteRobert Myers10/19/12 07:24 AM
                                  Supercomputer variant of Kahan quoteanon10/19/12 08:00 AM
                                    Supercomputer variant of Kahan quoteRobert Myers10/19/12 09:28 AM
                                      Supercomputer variant of Kahan quoteanon10/19/12 10:27 AM
                              Supercomputer variant of Kahan quoteforestlaughing10/19/12 10:26 AM
                                Supercomputer variant of Kahan quoteRobert Myers10/19/12 07:04 PM
                                  Supercomputer variant of Kahan quoteEmil Briggs10/20/12 04:52 AM
                                    Supercomputer variant of Kahan quoteRobert Myers10/20/12 07:51 AM
                                      Supercomputer variant of Kahan quoteEmil Briggs10/20/12 08:33 AM
                                        Supercomputer variant of Kahan quoteEmil Briggs10/20/12 08:34 AM
                                          Supercomputer variant of Kahan quoteRobert Myers10/20/12 09:35 AM
                                            Supercomputer variant of Kahan quoteEmil Briggs10/20/12 10:04 AM
                                              Supercomputer variant of Kahan quoteRobert Myers10/20/12 11:23 AM
                  Latency and HPC Workloadsanon10/16/12 06:48 PM
                    Latency and HPC Workloadsforestlaughing10/19/12 11:43 AM
              Latency and HPC Workloadsforestlaughing10/19/12 09:38 AM
                Latency and HPC WorkloadsRobert Myers10/19/12 11:40 AM
                Potential false economics in researchPaul A. Clayton10/19/12 12:54 PM
                  Potential false economics in researchVincent Diepeveen10/20/12 08:59 AM
                  Potential false economics in researchforestlaughing10/23/12 10:56 AM
                    Potential false economics in researchRobert Myers10/23/12 07:16 PM
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