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[Chicken-users] Re: [gambit-list] Help With Memory

From: Marc Feeley
Subject: [Chicken-users] Re: [gambit-list] Help With Memory
Date: Fri, 26 Sep 2008 12:21:36 -0400

On 26-Sep-08, at 11:45 AM, Alex Shinn wrote:

[I trimmed off the chicken-users list because I'm not
interested in a pissing match between implementations :)]

Marc Feeley <address@hidden> writes:

You are comparing Chicken to Chicken using different modes

Nope, Chicken to Gambit.

When Chicken and Gambit are benchmarked in "r6rs-fixflo-unsafe" mode
(which combines declarations for standard-bindings, fixnum specific
operations and unsafe execution (no type checks)) the results I get

 ctak: Chicken is 1.03 times faster than Gambit
 fibc: Gambit is 1.01 times faster than Chicken

I'm using Chicken 3.4.0 with the -Ob optimization level, and
Gambit 4.1.0 with

  (declare (standard-bindings)
           (not safe)

on an x86 Mac OS X machine.  Running each benchmark 5 times
(as separate processes), discarding the high and low and
averaging the middle 3 times I get:

              ctak         fibc
   Chicken    0.023        0.011
   Gambit     0.033        0.024

hence the 1.4x and 2x claims.

-- Alex

When I try the same thing on my 2 GHz MacBook Pro (with ctak repeated 100 times and fibc repeated 1000 times) I get:

           ctak       fibc
Chicken    1.883s     4.551s
Gambit     1.970s     3.118s

  ctak: Chicken is 1.05 times faster than Gambit
  fibc: Gambit is 1.46 times faster than Chicken

I've attached the trace and source code below. The wild difference in performance you get is perhaps due to the old version of Gambit you are using. Can you please try this on your machine with Gambit v4.2.8?


% gsc -v
% gsc ctak.scm
% gsi ctak
(time (go 100))
    1970 ms real time
    1961 ms cpu time (1838 user, 123 system)
1434 collections accounting for 324 ms real time (292 user, 31 system)
    1221381344 bytes allocated
    no minor faults
    no major faults
% gsc fibc.scm
% gsi fibc
(time (go 1000))
    3118 ms real time
    3103 ms cpu time (2945 user, 158 system)
1806 collections accounting for 411 ms real time (373 user, 38 system)
    1538392000 bytes allocated
    no minor faults
    no major faults
% csc -V

(c)2008 The Chicken Team
(c)2000-2007 Felix L. Winkelmann
Version 3.3.0 - macosx-unix-gnu-x86     [ manyargs dload ptables applyhook ]
SVN rev. 11106  compiled 2008-09-22 on neo.local (Darwin)

Enter "chicken -help" for information on how to use it.
% csc -b ctak.scm
% ./ctak
   1.883 seconds elapsed
   0.044 seconds in (major) GC
       0 mutations
      71 minor GCs
      91 major GCs
% csc -b fibc.scm
% ./fibc
   4.551 seconds elapsed
   0.093 seconds in (major) GC
       0 mutations
     206 minor GCs
     174 major GCs
% cat ctak.scm
(declare (standard-bindings)
         (not safe)

(define (ctak x y z)
   (lambda (k) (ctak-aux k x y z))))

(define (ctak-aux k x y z)
  (if (not (< y x))
      (k z)
       (lambda (k)
           (lambda (k) (ctak-aux k (- x 1) y z)))
           (lambda (k) (ctak-aux k (- y 1) z x)))
           (lambda (k) (ctak-aux k (- z 1) x y))))))))

(define (go n)
  (let loop ((n n) (r '()))
    (if (> n 0)
        (loop (- n 1) (ctak 18 12 6))

(pretty-print (time (go 100)))
% cat fibc.scm
(declare (standard-bindings)
         (not safe)

(define (_1+ n) (+ n 1))
(define (_1- n) (- n 1))

(define (addc x y k)
  (if (zero? y)
    (k x)
    (addc (_1+ x) (_1- y) k)))

(define (fibc x c)
  (if (zero? x)
    (c 0)
    (if (zero? (_1- x))
      (c 1)
(addc (call-with-current-continuation (lambda (c) (fibc (_1- x) c))) (call-with-current-continuation (lambda (c) (fibc (_1- (_1- x)) c)))

(define (go n)
  (let loop ((n n) (r '()))
    (if (> n 0)
        (loop (- n 1) (fibc 18 (lambda (n) n)))

(pretty-print (time (go 1000)))

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