150 GFLOP/s measured?

Article: PhysX87: Software Deficiency
By: Aaron Spink (aaronspink.delete@this.notearthlink.net), July 19, 2010 8:56 am
Room: Moderated Discussions
Richard Cownie (tich@pobox.com) on 7/19/10 wrote:
---------------------------
>That seems a bit extreme. There are significant HPC
>machines that spend a heck of a lot of time doing
>DP matrix-matrix multiplication, or FFT's, that are
>running carefully-optimized hand-coded routines.
>

And these codes tend to get the maximal performance less some single digit percentage possible given the constraints (caches, memory, interconnect, communication, etc).

>And graphics pipelines are another example, where we've
>shunted the work off onto carefully-optimized routines
>running on (lots of) in-order processors. If you
>want to say those aren't "real CPUs", then it's a bit
>of a circular argument: defining away all the things that
>work well as hand-tuned routines on in-order cores as
>being not "real" enough to count.
>
if by carefully-optimized, you mean JIT code that often has trouble reaching 50% efficiency on matmul kernels. In fact, the overriding trend in GPUs is computational efficiency being traded off for area and power efficiency.


>But that isn't a universal law - there *are* some
>applications where the computation routines are small
>enough and the data access patterns are predictable enough
>that hand-tuning for in-order cores is a good approach.
>
And these applications do just fine on OOOE processors and generally run better and faster on OOOE processors.

>Perhaps the various late and slow Itanium chips
>have given that approach a worse reputation than it
>deserves.
>
It has had a bad reputation for a while and it has little to do with Itanium. The simple fact is that OOOE allows hardware designs that cannot be done or cannot be done at all efficiently with an in order design. These hardware designs generally have more resources available for computation and get better performance both on unoptimized and highly optimized code.

Here's another way to think about it, why did CELL fail so badly? Its pretty much the ideal: in-order, software controlled data store, etc. Shouldn't it be blowing everything else out of the water?

Aaron Spink
speaking for myself inc.
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          150 GFLOP/s measured?David Kanter2010/07/08 07:53 PM
            150 GFLOP/s measured?Aaron Spink2010/07/08 09:05 PM
              150 GFLOP/s measured?anon2010/07/08 09:31 PM
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                    150 GFLOP/s measured?Ian Ollmann2010/07/19 01:14 AM
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                        150 GFLOP/s measured?hobold2010/07/19 07:26 AM
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                      150 GFLOP/s measured?Linus Torvalds2010/07/19 07:36 AM
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                                150 GFLOP/s measured?Richard Cownie2010/07/19 04:10 PM
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            You are just quoting SINGLE precision flops? OMG what planet do you live? Vincent Diepeveen2010/07/19 10:26 AM
              The prior poster was talking about SP (NT)David Kanter2010/07/19 11:34 AM
                All FFT's need double precisionVincent Diepeveen2010/07/19 02:02 PM
                  All FFT's need double precisionDavid Kanter2010/07/19 02:09 PM
                    All FFT's need double precisionVincent Diepeveen2010/07/19 04:06 PM
                  All FFT's need double precision - notMichael S2010/07/20 01:16 AM
                    All FFT's need double precision - notUngo2010/07/21 12:04 AM
                      All FFT's need double precision - notMichael S2010/07/21 02:35 PM
                      All FFT's need double precision - notEduardoS2010/07/21 02:52 PM
                        All FFT's need double precision - notAnon2010/07/21 05:23 PM
                          All FFT's need double precision - notRicardo B2010/07/26 07:46 AM
                        I'm on a boat!anon2010/07/22 11:42 AM
                        All FFT's need double precision - notVincent Diepeveen2010/07/24 11:39 PM
                          All FFT's need double precision - notslacker2010/07/25 03:27 AM
                            All FFT's need double precision - notRicardo B2010/07/26 07:40 AM
                          All FFT's need double precision - notEduardoS2010/07/25 08:37 AM
                            All FFT's need double precision - notMichael S2010/07/25 10:43 AM
                    All FFT's need double precision - notVincent Diepeveen2010/07/24 11:19 PM
      A bit off baseEduardoS2010/07/08 04:08 PM
        A bit off baseGroo2010/07/08 06:11 PM
          A bit off basejohn mann2010/07/08 06:58 PM
            All right...let's cool it...David Kanter2010/07/08 07:54 PM
    A bit off baseVincent Diepeveen2010/07/19 03:36 PM
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