Intel's Groveport Platform

By: Brendan (btrotter.delete@this.gmail.com), April 17, 2017 3:13 pm
Room: Moderated Discussions
Hi,

Michael S (already5chosen.delete@this.yahoo.com) on April 17, 2017 1:43 pm wrote:
> Brendan (btrotter.delete@this.gmail.com) on April 14, 2017 12:23 pm wrote:
> > Michael S (already5chosen.delete@this.yahoo.com) on April 14, 2017 8:09 am wrote:
> > For single threaded they are slow (compared to "equally modern" alternatives). However, when you have
> > more threads than CPUs (e.g. many thin clients running many completely unrelated processes, many separate
> > compiler/linker processes, etc) a normal server at the same price (e.g. a pair of 8-core Xeon E5s)
> > is even slower (due to the time threads have to wait doing nothing between timeslices).
> >
>
> Doing nothing between timeslices?
> May be, I am taking you more seriously than you deserve?
> Or your way of thinking and expressing thoughts is just to different from mine?

This is extremely basic stuff. If there's 10 threads that want to use a CPU and only one CPU, at any point in time 9 threads can't be using that CPU and would be waiting ("doing nothing"); and 10 CPUs that are half as fast would be a huge improvement.

> IMHO, it's bloody obvious than if KNL has any chance at all to be competitive against "normal" Xeon
> on non-HPC loads then it's *only* when there is a lot of parallel tasks ready all the time. *Much* more
> tasks than mere 32 that are needed for full utilization of a pair of hyperthreaded 8-core Xeons.

Yes; and it would be extremely foolish to assume that HPC is the only case where there is a lot of parallel tasks. Unfortunately, for some bizarre reason, some "HPC people" think that they're special little snowflakes.

It would also be extremely foolish to assume "parallel tasks ready all the time". For fluctuating loads you want to cope with the peak demand. You don't want a system that crumbles during the "9 am office worker rush" because someone decided it'd be overkill for the "overnight lull".

> And no, according to Intel's own estimates, even in the best case scenario
> (SPECInt2006_base) KNL does not quite match performance of dual Xeon E5 2620
> v4, which street price is likely 2.5-3 times lower than Growerport.

Are you suggesting that HPC are the only special little snowflakes that use floating point; or that HPC is beaten by dual Xeon E5 2620 for both HPC and non-HPC?

- Brendan
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
Intel's Groveport PlatformMS04/11/17 01:41 PM
  Intel's Groveport PlatformDaveC04/11/17 05:47 PM
    Intel's Groveport PlatformMichael S04/12/17 07:14 AM
  Intel's Groveport PlatformBrendan04/12/17 05:49 AM
    Intel's Groveport PlatformMS04/12/17 03:23 PM
      Intel's Groveport PlatformBrendan04/12/17 07:50 PM
        Intel's Groveport PlatformMichael S04/13/17 10:51 AM
          Intel's Groveport PlatformBrendan04/14/17 07:40 AM
            Intel's Groveport PlatformMichael S04/14/17 08:09 AM
              Intel's Groveport PlatformBrendan04/14/17 12:23 PM
                Intel's Groveport PlatformMichael S04/17/17 01:43 PM
                  Intel's Groveport PlatformBrendan04/17/17 03:13 PM
                    Intel's Groveport PlatformMichael S04/17/17 04:18 PM
                      Intel's Groveport PlatformBrendan04/17/17 05:35 PM
                        Intel's Groveport Platformanon04/17/17 06:32 PM
                          Intel's Groveport PlatformBrendan04/17/17 08:31 PM
                            Intel's Groveport Platformanon04/17/17 10:39 PM
                              Intel's Groveport PlatformBrendan04/17/17 11:48 PM
                                Intel's Groveport PlatformMichael S04/18/17 01:40 AM
                                Intel's Groveport Platformanon04/18/17 03:32 AM
                                  Intel's Groveport PlatformBrendan04/19/17 04:43 PM
                                    Intel's Groveport Platformanon04/21/17 05:10 PM
                                    Intel's Groveport PlatformJukka Larja04/21/17 11:09 PM
                            Intel's Groveport PlatformMichael S04/18/17 01:17 AM
                            Intel's Groveport PlatformMichael S04/18/17 01:29 AM
                        Intel's Groveport PlatformMaynard Handley04/17/17 09:40 PM
                          Intel's Groveport PlatformBrendan04/17/17 10:13 PM
                          snowflakesMichael S04/18/17 01:06 AM
                            snowflakesAaron Spink04/18/17 07:21 AM
                              strawberries Daniel B04/20/17 04:31 AM
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