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Re: Very good news from AMD

From Jason Riedy <jason@lovesgoodfood.com>
Newsgroups comp.arch
Subject Re: Very good news from AMD
Organization Just me.
References <e6933e28-bc1a-4343-83b6-66b44f1eddae@b21g2000yqc.googlegroups.com> <8762ncevv6.fsf@NaN.sparse.dyndns.org> <4E179E0B.1010902@SPAM.comp-arch.net> <87oc13rolb.fsf@NaN.sparse.dyndns.org> <4E194AAF.6030307@SPAM.comp-arch.net>
Date 2011-07-10 13:34 -0400
Message-ID <87sjqeqbss.fsf@NaN.sparse.dyndns.org> (permalink)

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And Andy Glew writes:
> Memory may be failing me, but I think that the MTA was a fixed
> barrel scheduled machine.  Did thy not have a fixed 128 threads
> per node, and always switch from thread to thread, every cycle,
> with no variation in the schedule?

It switched to the next *ready* stream.  If a stream is waiting
for memory, it isn't ready and is skipped by scheduling.
Similarly, if a stream already has an instruction in the pipe,
it's skipped.

My old micro-benchmarks made the scheduling look a bit more
dynamic than a simple barrel even without memory interaction.
There was a large variation in the number of cycles between
consecutive instructions in a single stream.
-- 
Jason

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Thread

Very good news from AMD Quadibloc <jsavard@ecn.ab.ca> - 2011-07-07 20:14 -0700
  Re: Very good news from AMD Jason Riedy <jason@lovesgoodfood.com> - 2011-07-08 09:37 -0400
    Re: Very good news from AMD "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-07-08 09:33 -0700
      Re: Very good news from AMD "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-07-08 16:21 -0700
        Re: Very good news from AMD "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-07-08 17:30 -0700
          Re: Very good news from AMD "Paul A. Clayton" <paaronclayton@gmail.com> - 2011-07-25 20:24 -0700
    Re: Very good news from AMD Robert Myers <rbmyersusa@gmail.com> - 2011-07-08 12:33 -0700
      Re: Very good news from AMD Thomas Womack <twomack@chiark.greenend.org.uk> - 2011-07-08 20:59 +0100
        Re: Very good news from AMD Robert Myers <rbmyersusa@gmail.com> - 2011-07-09 14:57 -0700
    Re: Very good news from AMD "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-07-08 17:17 -0700
      Re: Very good news from AMD Jason Riedy <jason@lovesgoodfood.com> - 2011-07-09 20:01 -0400
        Re: Very good news from AMD "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-07-09 23:46 -0700
          Re: Very good news from AMD Jason Riedy <jason@lovesgoodfood.com> - 2011-07-10 13:34 -0400
            Re: Very good news from AMD "Andy \"Krazy\" Glew" <andy@SPAM.comp-arch.net> - 2011-07-10 12:23 -0700
    Re: Very good news from AMD Quadibloc <jsavard@ecn.ab.ca> - 2011-07-08 18:14 -0700
    Re: Very good news from AMD Quadibloc <jsavard@ecn.ab.ca> - 2011-07-09 10:19 -0700
  Re: Very good news from AMD Terje Mathisen <"terje.mathisen at tmsw.no"> - 2011-07-08 23:11 +0200
  Re: Very good news from AMD "Skybuck Flying" <Windows7IsOK@DreamPC2006.com> - 2011-07-10 09:39 +0200
    Re: Very good news from AMD "Skybuck Flying" <Windows7IsOK@DreamPC2006.com> - 2011-07-11 10:37 +0200
      Re: Very good news from AMD "Skybuck Flying" <Windows7IsOK@DreamPC2006.com> - 2011-07-12 03:55 +0200
        Re: Very good news from AMD "Skybuck Flying" <Windows7IsOK@DreamPC2006.com> - 2011-07-12 04:05 +0200

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