[gambit-list] Closures, continuations, strategies, and actual

Pavel Dudrenov dudrenov at gmail.com
Sun May 24 16:11:59 EDT 2009


Thank you for sharing this article. I don't think you are a troll,
and, unfortunately, my mentality is of 15 old.


On Sun, May 24, 2009 at 5:37 AM, D.McClain <dbm at asyrmatos.com> wrote:
> Yes, I notice you guys are quick to assume that I must be a troll and try to
> shoot me down. I was getting the impression that I was addressing an
> audience of 15-year olds.
> FYI, I am an astrophysicist by training, but I have been doing computers in
> anger for more than 40 years. My primary interests are in applied and
> embedded computing, not comp sci per se, although I do also have some
> graduate work in CompSci.
> Hence, I am most impressed by actual implementations and measurements.
> Concrete examples of theoretical topics are most welcome. But sweeping
> theoretical statements are really not very impressive.
> Cheers,
> Dr. David McClain
> Sr. VP, Embedded Systems
> Asyrmatos Inc.
> Boston & Tucson
> phone:  520-529-2437
> cell:  520-390-3995
> web:  www.asyrmatos.com
> e-mail: dbm at asyrmatos.com
>
>
>
> On May 24, 2009, at 00:37, David Rush wrote:
>
> 2009/5/23 D.McClain <dbm at asyrmatos.com>:
>
> should go a long way toward explaining why CPS code may be slower than
> direct form code.
>
> I have not yet read the paper, but it appears that there is a
> terminological disconnect happening here.
> In Scheme, I program using CPS precisely because it is in fact
> *faster*. Specifically, I have show it to be faster when compiling
> using Stalin. However, this performance increase is not a direct
> result of the CPS idiom, but due to the fact that monomorphic data
> extents are clearly defined - allowing Stalin more aggressive
> optimizations.
> Note that I am *not* using CPS to implement *continuations*. But I am
> using the CPS idiom in cases where a caller knows quite a bit more
> about type-appropriate behavior than the (ultimate) callee. Such
> conditions are often used as examples of when call/cc is helpful (e.g.
> in implementing exceptions).
> The point being that there is a long difference between programming in
> a CPS idiom and reifying continuations with call/cc. Saying CPS code
> is slower is simply silly and makes you look like a troll.
> david rush
> --
> GPG Public key at http://cyber-rush.org/drr/gpg-public-key.txt
>
>
>
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