Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied)

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From	Chris Hinsley <chris.hinsley@gmail.com>
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Date	Mon, 8 Oct 2012 20:56:03 +0100
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On 2012-10-08 19:43:00 +0000, Chris Hinsley said:

> On 2012-10-08 08:38:34 +0000, Mark Wills said:
> 
>> "The secret sauce in the Epiphany design is the memory architecture,
>> which allows any core to access the SRAM of any other core on the die.
>> This SRAM is mapped as a single address space across the cores,
>> greatly simplifying memory management. Each core has a direct memory
>> access (DMA) unit that can prefetch data from external flash memory."
>> 
>> Oh. That is seriously nice.
>> 
>> See here: 
>> http://www.theregister.co.uk/2012/10/07/adapteva_epiphany_parallel_computing_kickstarter/ 
>> 
> 
> The hardware and SDK refernce manuals are avaiable for download now 
> BTW. Check the kickstarter announcement, it has the links to download.
> 
> Wish it had a bit more local memory, but yep, it looks quite nice.
> 
> Chris

Actually the memory architecture is very nice, you can even run 
instructions from the memory of external cores. Esentially the memory 
address top 6 bits are an core (x,y) address, the lower bits the dram 
address. The scoreboarding of registers in the dependancy logic can 
cope fine with instructions and register reads/writes from/to external 
core addresses. Each hop of a core adds 1 cycle to the stall if you try 
to use a register prior to the data being available. You can think of 
the mesh network as 3 seperate 2D token rings, a core can fill in an 
empty slot as it goes by etc (arbitration logic round robbins the slots 
between CPU, DMA and the neibouring cores).

2 DMA channels per core that can read/write 2D memory regions, plus 
chained DMA descriptors so you can do nice Amiga style DMA blit lists 
etc. Plus I belive the DMA can do remote read/writes, so you can get a 
cores DMA engine to do transfers from a remote core to another remote 
core…

The 32KB SRAM is organised as 4 8KB banks, each can be accsessed every 
cycle by various bits of the hardware, instruction read, DMA, etc etc. 
You need to keep instructions, data in, data out, buffers in seperate 
banks to hit maximum speed.

Probably best for compute kernels ATM till more local memory is 
available, but there is room in the memory map for more per core ! 
Bring on the version with 64 cores and 1MB SRAM per core and things 
will get very interesting !

Chris

Thread

Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "B.Person" <bruce.person@gmail.com> - 2012-09-28 07:16 -0700
  Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) jacko <jackokring@gmail.com> - 2012-09-28 10:44 -0700
    Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. (link supplied) jacko <jackokring@gmail.com> - 2012-09-28 10:45 -0700
    Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Mark Wills <forthfreak@gmail.com> - 2012-09-28 11:42 -0700
  Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Jecel <jecel@merlintec.com> - 2012-09-28 11:39 -0700
  Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Paul Rubin <no.email@nospam.invalid> - 2012-09-28 11:44 -0700
  Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-09-29 14:55 -0400
    Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Paul Rubin <no.email@nospam.invalid> - 2012-09-29 12:13 -0700
      Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-09-29 23:13 +0200
        Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Paul Rubin <no.email@nospam.invalid> - 2012-09-29 17:30 -0700
          Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Elizabeth D. Rather" <erather@forth.com> - 2012-09-29 17:59 -1000
            Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Anonymous <nobody@remailer.paranoici.org> - 2012-09-30 13:50 +0000
              Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Ed" <invalid@nospam.com> - 2012-10-02 23:53 +1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Fritz Wuehler <fritz@spamexpire-201210.rodent.frell.theremailer.net> - 2012-10-03 19:10 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-03 07:41 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. vandys@vsta.org - 2012-10-03 18:06 +0000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-03 20:22 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-04 08:39 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-04 07:51 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-04 14:05 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-04 09:26 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-04 19:23 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. vandys@vsta.org - 2012-10-05 00:41 +0000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-05 15:43 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. vandys@vsta.org - 2012-10-05 21:14 +0000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-07 17:58 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Ed" <invalid@nospam.com> - 2012-10-04 13:40 +1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-03 21:34 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Anonymous <nobody@remailer.paranoici.org> - 2012-10-04 09:49 +0000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Ed" <invalid@nospam.com> - 2012-10-10 00:10 +1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-09 16:42 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-09 14:01 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Paul Rubin <no.email@nospam.invalid> - 2012-10-09 11:43 -0700
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-09 09:02 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-09 15:34 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-09 09:53 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-09 16:06 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-09 17:00 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-10 20:54 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-11 19:26 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-12 23:52 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Elizabeth D. Rather" <erather@forth.com> - 2012-10-13 07:56 -1000
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-13 15:06 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-10 01:29 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. rickman <gnuarm@gmail.com> - 2012-10-09 15:31 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Paul Rubin <no.email@nospam.invalid> - 2012-10-09 14:14 -0700
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-09 21:37 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Paul Rubin <no.email@nospam.invalid> - 2012-10-09 15:26 -0700
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-10 02:21 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. Paul Rubin <no.email@nospam.invalid> - 2012-10-09 19:40 -0700
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-10-04 17:07 -0400
        Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-09-29 22:12 -0400
          Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Elizabeth D. Rather" <erather@forth.com> - 2012-09-29 18:38 -1000
          Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Paul Rubin <no.email@nospam.invalid> - 2012-09-29 23:38 -0700
            Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Jecel <jecel@merlintec.com> - 2012-09-30 11:47 -0700
            Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) rickman <gnuarm@gmail.com> - 2012-10-02 00:19 -0400
              Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-02 16:06 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. (link supplied) gavino_himself <visploveslisp@gmail.com> - 2012-10-05 14:50 -0700
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-06 03:14 +0200
          Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-09-30 16:34 +0200
            Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-10-01 02:31 -0400
              Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Paul Rubin <no.email@nospam.invalid> - 2012-10-01 01:27 -0700
              Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-01 16:57 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-10-02 16:51 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-03 02:48 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-10-04 17:47 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-05 00:39 +0200
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-10-06 18:47 -0400
                Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) Paul Rubin <no.email@nospam.invalid> - 2012-10-02 19:23 -0700
  Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) gavino_himself <visploveslisp@gmail.com> - 2012-09-30 17:05 -0700
    Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cmm> - 2012-10-01 02:26 -0400
      Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-10-05 19:45 +0000
    Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-10-04 13:22 +0000
    Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) awegel@arcor.de (Alex Wegel) - 2012-10-06 02:37 +0200
  Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Mark Wills <forthfreak@gmail.com> - 2012-10-08 01:38 -0700
    Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Chris Hinsley <chris.hinsley@gmail.com> - 2012-10-08 20:43 +0100
      Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Chris Hinsley <chris.hinsley@gmail.com> - 2012-10-08 20:56 +0100
      Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) rickman <gnuarm@gmail.com> - 2012-10-08 16:00 -0400
        Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Chris Hinsley <chris.hinsley@gmail.com> - 2012-10-08 21:05 +0100
          Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) rickman <gnuarm@gmail.com> - 2012-10-08 16:40 -0400
            Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Chris Hinsley <chris.hinsley@gmail.com> - 2012-10-08 23:16 +0100
              Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Mark Wills <forthfreak@gmail.com> - 2012-10-09 00:19 -0700
                Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Chris Hinsley <chris.hinsley@gmail.com> - 2012-10-09 18:43 +0100
          Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-10-09 09:59 +0000
            Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Chris Hinsley <chris.hinsley@gmail.com> - 2012-10-09 18:46 +0100
        Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) marko <marko@marko.marko> - 2012-10-10 07:29 +1100
          Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) rickman <gnuarm@gmail.com> - 2012-10-09 17:11 -0400
            Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-10 01:11 +0200
              Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) rickman <gnuarm@gmail.com> - 2012-10-09 20:46 -0400
                Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) Bernd Paysan <bernd.paysan@gmx.de> - 2012-10-10 14:48 +0200
                Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) gavino_himself <visploveslisp@gmail.com> - 2012-10-12 13:35 -0700
                Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) rickman <gnuarm@gmail.com> - 2012-10-13 00:01 -0400
                Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) "Rod Pemberton" <do_not_have@notemailnotz.cnm> - 2012-10-13 20:51 -0400
                Re: Your next supercomputer! Just $99 for 16 ARM cores on a chip. (link supplied) rickman <gnuarm@gmail.com> - 2012-10-14 17:36 -0400
  Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) gavino_himself <visploveslisp@gmail.com> - 2012-10-12 13:34 -0700
  Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip.  (link supplied) "B.Person" <bruce.person@gmail.com> - 2012-10-26 13:35 -0700
    Re: Your next supercomputer!  Just $99 for 16 ARM cores on a chip. (link supplied) "B.Person" <bruce.person@gmail.com> - 2012-10-27 08:54 -0700

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