Re: Green Compiler ?

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From	Walter Banks <walter@bytecraft.com>
Newsgroups	comp.compilers
Subject	Re: Green Compiler ?
Date	Fri, 28 Dec 2012 10:42:47 -0500
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Abid wrote:

> Hi:
>
> It seems that the Power Wall is becoming a major  issue, especially for High
> Performance Computing. Current compilers work has two dimensional model, i.e.,
> all the optimization phases are targeted either towards reducing execution
> time or code size. My question is: Do we need to change this model and make it
> three dimensional by adding power axis in the search space? If yes, then we
> have to revisit all the phases and adjust them or come up with  new cost
> models for these phases.
>
> I will be grateful if some one can point me to the latest efforts/projects
> with respect to power efficient compilation for high performance computing.

There has been a lot of work on energy efficient compiling. In the 80's
were were working on a data logging project where the devices needed to
run on battery power unattended for for more than a year in very bad
environments.

We created a compiler (CMOS variant to the Motorola 6805) to do the
development work initially optimized to require minimum execution
cycles.  As the project evolved we refined our model of the power
profile of the processor and made design modifications to product to
reduce energy consumption.

Our models started to look at both number of RAM and ROM fetches and
RAM writes as well as cycle counts. RAM and ROM access were separately
characterized.

We focused on utilizing page0 zero memory accesses and switching
external memory from sleep to active mode and minimizing the time each
memory was active.

The accumulation of the various optimizations made a big difference
to the energy consumption of the application.

Walter Banks

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Thread

Green Compiler ? Abid <abidmuslim@gmail.com> - 2012-12-20 02:00 -0800
  Re: Green Compiler ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-23 08:18 +0000
    Re: Green Compiler ? Peter Dassow <z80eu@arcor.de> - 2012-12-26 19:31 +0100
      Re: Green Compiler ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-28 03:09 +0000
      Re: Green Compiler ? Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-12-28 08:35 +0100
        Re: Green Compiler ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2012-12-28 16:14 +0000
        Re: Green Compiler ? Peter Dassow <z80eu@arcor.de> - 2012-12-29 09:35 +0100
          Re: Green Compiler ? Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-12-30 08:14 +0100
            Re: Green Compiler ? George Neuner <gneuner2@comcast.net> - 2012-12-31 01:24 -0500
              Re: Green Compiler ? "Jonathan Thornburg" <jthorn@astro.indiana.edu> - 2013-01-02 04:09 +0000
                Re: Green Compiler ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-01-02 18:29 +0000
              Re: Green Compiler ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-01-02 05:11 +0000
              Re: Green Compiler ? Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2013-01-02 07:29 +0100
                Re: Green Compiler ? glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2013-01-02 19:52 +0000
                Re: Green Compiler ? "Charles Richmond" <numerist@aquaporin4.com> - 2013-01-04 08:59 -0600
  Re: Green Compiler ? "Nils M Holm" <nmh@t3x.org> - 2012-12-23 10:01 +0100
    Re: Green Compiler ? Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2012-12-24 05:16 +0100
    Re: Green Compiler ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-12-27 13:36 +0000
      Re: Green Compiler ? "Nils M Holm" <nmh@t3x.org> - 2012-12-28 09:11 +0100
        Re: Green Compiler ? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-12-28 16:57 +0000
        Re: Green Compiler ? George Neuner <gneuner2@comcast.net> - 2012-12-28 12:57 -0500
          Re: Green Compiler ? "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-12-30 09:22 +0100
    Re: Green Compiler ? Joshua Cranmer <Pidgeot18@verizon.invalid> - 2012-12-27 21:59 -0600
  Re: Green Compiler ? Walter Banks <walter@bytecraft.com> - 2012-12-28 10:42 -0500

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