Re: Very good news from AMD

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Subject	Re: Very good news from AMD
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On 7/8/2011 6:37 AM, Jason Riedy wrote:
> And Quadibloc writes:
>> http://www.theregister.co.uk/2011/07/07/amd_graphics_core_next/
>
> Cute.  It's a Cray X1/SV2 on a chip.

I'vwe been hoping to find time to write an article "AMD's Next 
Generation GPU: Larrabee done right."

They are apparently giving up on VLIW.

They are even giving up on SIMT/CT (Single Instruction Multiple 
Threads/Coherent Threading).

When I asked the architect (I attended the conference) how they compared 
to Larrabee, he said "well, we have 2Kbit entry vectors spread over 4 
clocks, rather than 512b vectors done in exactly one clock".

I would go further: they are a dynamically scheduled vector machine.
Choosing which instructions to dispatch from 10 or 40 threads per 
compute unit (I need to check my notes - I think it is choosing up to 10 
instructions from 10 different threads, which will execute for 4 cycles, 
from a pool off 40 threads per compute unit - but I may have that wrong).

They may have totally given up on SIMT/CT, but I would not be surprised 
to see some ISA support to make it easier to emulate DirectX or OpenGL 
threads per vector lane.

Unfortunately, only high level keynote slides are on web.  The actual 
detail slides, from Mantor and Houston's talk, are not on the web.

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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