Latency and HPC Workloads

Article: Intel's Near-Threshold Voltage Computing and Applications
By: anon (anon.delete@this.anon.com), October 3, 2012 5:50 pm
Room: Moderated Discussions
Robert Myers (rbmyersusa.delete@this.gmail.com) on October 3, 2012 10:52 am wrote:
> David Kanter (dkanter.delete@this.realworldtech.com) on September 18, 2012 12:26
> pm wrote:
> > Our latest article has just gone online:
> >
> >
> "Near-threshold voltage computing
> > extends the voltage scaling associated
> with Moore's Law and dramatically
> > improves power and energy efficiency.
> The technology is superb for throughput,
> > at the cost of latency, and best
> suited to Intel's products for HPC and mobile
> > graphics."
> >
>
> I've
> sort of dropped this subject because I am busy with other things, but HPC
> workloads are not a uniform universe. As I have been repeatedly informed,
> latency is still a driving issue for many HPC workloads. I'd make the trade of
> latency vs. power, computational density, and/or bandwidth any day, but I don't
> know how many HPC users would agree.

What do you mean by latency?

There is the old problem with how many physical simulations are scaled to many cores, which is that the speed of the result is determined by the speed of the slowest job. So in a 1000 core system, a core which is taking a periodic interrupt or administrative job that causes its job to run 1% slower, is better off not being used at all, because it effectively costs 10 cores of throughput.

This is the latency issue that I know HPC cares about. But if they could choose to have a CPU which is 200% the throughput but with a 10% variation between CPUs, surely there is no downside to that (provided that perf/watt stays the same and overall power draw scales with the idle time introduced).
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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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