Latency and HPC Workloads

Article: Intel's Near-Threshold Voltage Computing and Applications
By: Michael S (already5chosen.delete@this.yahoo.com), October 8, 2012 1:59 pm
Room: Moderated Discussions
SHK (nomail.delete@this.mail.com) on October 8, 2012 5:42 am wrote:
> Robert Myers (rbmyersusa.delete@this.gmail.com) on October 4, 2012 10:24 am
> wrote:
>

> anon (anon.delete@this.anon.com) on October 3, 2012 6:50 pm wrote:
>
>
> >
>
> > What do you mean by latency?
> >
>
> As I have been
> involved in
> discussions, latency has always referred to the latency of memory
> references,
> whether to cache, to local memory, or to remote
> memory.
>
>
> www.sandia.gov/~rcmurph/doc/latency.pdf
>
> Robert.
>

>
> One of the things i
> really don't like in HPC since the whole "clusters take over vector processors"
> has taken place is that even the top machines on top500 are stuck with commodity
> DRAM+hardware managed caches. Everybody is complaining about the memory wall but
> something like RLDRAM-3 (AFAIK) has never been used outside networking
> equipment.
> Disregarding the physical implementation seems that a Cray T90 was a
> much better and balanced architecture for HPC.

First, you will have to convince Intel/AMD to include support for RLDRAM into their IMCs. According to my understanding, RLDRAM access protocol is substantially different from SDRAM DDR2/DDR3, or any SDRAM for that matter, so the required effort is not trivial.

Second, RLDRAM would be pretty bad for capacity, except if your opt for some form of fully buffered, which by itself adds more latency than RLDRAM saves.
If I am not mistaken, with RLDRAM you can't currently get more than 512 MB per 64bit "channel". That's like going almost full decade back. With standard unbuffered DDR3 you can easily get 8 GB per channel, with registered DDR3 - up to 96 GB/channel.




Could RLDRAM provide
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TopicPosted ByDate
New article: Intel's Near-Threshold ComputingDavid Kanter2012/09/18 12:26 PM
  Higher SRAM voltage and shared L1Paul A. Clayton2012/09/18 02:38 PM
    Higher SRAM voltage and shared L1David Kanter2012/09/18 05:20 PM
      Higher SRAM voltage and shared L1Eric2012/09/20 10:44 AM
        Higher SRAM voltage and shared L1David Kanter2012/09/20 12:24 PM
      Yes, that kind of asynchronousPaul A. Clayton2012/09/20 02:53 PM
    Higher SRAM voltage and shared L1somebody2012/09/19 09:27 AM
      So micro-turboboost is doubly impracticalPaul A. Clayton2012/09/20 02:53 PM
  Big littleDoug S2012/09/18 03:04 PM
    Big littleDavid Kanter2012/09/18 04:05 PM
    Big littleRicardo B2012/09/19 04:06 AM
  New article: Intel's Near-Threshold Computingdefderdar2012/09/18 09:39 PM
    New article: Intel's Near-Threshold Computingtarlinian2012/09/19 08:32 AM
      New article: Intel's Near-Threshold ComputingDavid Kanter2012/09/19 10:44 AM
  New article: Intel's Near-Threshold ComputingMark Christiansen2012/09/19 11:31 AM
    New article: Intel's Near-Threshold ComputingChris Brodersen2012/09/19 12:54 PM
  New article: Intel's Near-Threshold ComputingEric2012/09/20 10:47 AM
  Latency and HPC WorkloadsRobert Myers2012/10/03 10:52 AM
    Latency and HPC Workloadsanon2012/10/03 06:50 PM
      Latency and HPC WorkloadsRobert Myers2012/10/04 10:24 AM
        Latency and HPC WorkloadsSHK2012/10/08 05:42 AM
          Latency and HPC WorkloadsMichael S2012/10/08 01:59 PM
            Latency and HPC WorkloadsSHK2012/10/08 02:42 PM
              Latency and HPC WorkloadsMichael S2012/10/08 05:12 PM
                Latency and HPC Workloadsforestlaughing2012/10/15 08:41 AM
                  The original context was Micron RLDRAM (NT)Michael S2012/10/15 08:55 AM
                    The original context was Micron RLDRAMforestlaughing2012/10/15 10:21 AM
              Latency and HPC Workloads - Why not SRAM?Kevin G2012/10/09 09:48 AM
                Latency and HPC Workloads - Why not SRAM?Michael S2012/10/09 10:33 AM
                  Latency and HPC Workloads - Why not SRAM?SHK2012/10/09 12:55 PM
                    Why not SRAM? - CapacityRohit2012/10/09 09:13 PM
                  Latency and HPC Workloads - Why not SRAM?Kevin G2012/10/09 03:04 PM
                    Latency and HPC Workloads - Why not SRAM?Michael S2012/10/09 04:52 PM
                      Latency and HPC Workloads - Why not SRAM?Robert Myers2012/10/10 10:11 AM
                        Latency and HPC Workloads - Why not SRAM?forestlaughing2012/10/15 08:02 AM
                          Latency and HPC Workloads - Why not SRAM?Robert Myers2012/10/15 09:04 AM
                            Latency and HPC Workloads - Why not SRAM?forestlaughing2012/10/16 09:13 AM
                          Latency and HPC Workloads - Why not SRAM?SHK2012/10/16 08:12 AM
                    Latency and HPC Workloads - Why not SRAM?slacker2012/10/11 01:35 PM
                      SRAM leakageDavid Kanter2012/10/11 03:00 PM
          Latency and HPC Workloadsforestlaughing2012/10/15 08:57 AM
            Latency and HPC WorkloadsRobert Myers2012/10/16 07:28 AM
              Latency and HPC WorkloadsMichael S2012/10/16 07:35 AM
              Latency and HPC Workloadsanon2012/10/16 08:17 AM
                Latency and HPC WorkloadsRobert Myers2012/10/16 09:56 AM
                  Supercomputer variant of Kahan quotePaul A. Clayton2012/10/16 11:09 AM
                    Supercomputer variant of Kahan quoteanon2012/10/17 01:17 AM
                      Supercomputer variant of Kahan quoteRobert Myers2012/10/17 04:34 AM
                        Supercomputer variant of Kahan quoteanon2012/10/17 05:12 AM
                          Supercomputer variant of Kahan quoteRobert Myers2012/10/17 02:38 PM
                            Supercomputer variant of Kahan quoteanon2012/10/17 05:24 PM
                              Supercomputer variant of Kahan quoteRobert Myers2012/10/17 05:45 PM
                                Supercomputer variant of Kahan quoteanon2012/10/17 05:58 PM
                                Supercomputer variant of Kahan quoteanon2012/10/17 05:58 PM
                                  Supercomputer variant of Kahan quoteRobert Myers2012/10/17 07:14 PM
                                    Supercomputer variant of Kahan quoteanon2012/10/17 08:36 PM
                                      Supercomputer variant of Kahan quoteRobert Myers2012/10/18 09:47 AM
                                        Supercomputer variant of Kahan quoteanon2012/10/19 02:34 AM
                                          Supercomputer variant of Kahan quoteanon2012/10/19 04:47 AM
                                          Supercomputer variant of Kahan quoteRobert Myers2012/10/19 03:14 PM
                        Supercomputer variant of Kahan quoteMichael S2012/10/17 06:56 PM
                          Supercomputer variant of Kahan quoteanon2012/10/17 09:02 PM
                            Supercomputer variant of Kahan quoteRobert Myers2012/10/18 01:29 PM
                              Supercomputer variant of Kahan quoteanon2012/10/19 02:27 AM
                                Supercomputer variant of Kahan quoteRobert Myers2012/10/19 07:24 AM
                                  Supercomputer variant of Kahan quoteanon2012/10/19 08:00 AM
                                    Supercomputer variant of Kahan quoteRobert Myers2012/10/19 09:28 AM
                                      Supercomputer variant of Kahan quoteanon2012/10/19 10:27 AM
                              Supercomputer variant of Kahan quoteforestlaughing2012/10/19 10:26 AM
                                Supercomputer variant of Kahan quoteRobert Myers2012/10/19 07:04 PM
                                  Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 04:52 AM
                                    Supercomputer variant of Kahan quoteRobert Myers2012/10/20 07:51 AM
                                      Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 08:33 AM
                                        Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 08:34 AM
                                          Supercomputer variant of Kahan quoteRobert Myers2012/10/20 09:35 AM
                                            Supercomputer variant of Kahan quoteEmil Briggs2012/10/20 10:04 AM
                                              Supercomputer variant of Kahan quoteRobert Myers2012/10/20 11:23 AM
                  Latency and HPC Workloadsanon2012/10/16 06:48 PM
                    Latency and HPC Workloadsforestlaughing2012/10/19 11:43 AM
              Latency and HPC Workloadsforestlaughing2012/10/19 09:38 AM
                Latency and HPC WorkloadsRobert Myers2012/10/19 11:40 AM
                Potential false economics in researchPaul A. Clayton2012/10/19 12:54 PM
                  Potential false economics in researchVincent Diepeveen2012/10/20 08:59 AM
                  Potential false economics in researchforestlaughing2012/10/23 10:56 AM
                    Potential false economics in researchRobert Myers2012/10/23 07:16 PM
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