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Re: gratuitous optimization and benchmarking



 * From: "Taylor R. Campbell" <campbell@xxxxxxxxxx>
 * Date: Fri, 7 Apr 2006 16:54:44 +0000
 * Subj: Re: gratuitous optimization and benchmarking

 | I didn't see how you loaded the code in any of the systems, so I
can't
 | tell where the disparity is exactly, but here are my guesses:

  1. In Scheme48, you probably neither set inline-values at the REPL
     nor used the module system.  By default, the REPL will compile
     code under the assumption that any binding can be redefined,
     including standard R5RS ones, so it inhibits the compiler from
     performing *any* kind of analyses on standard bindings.  This
     means that it was given no chance to recognize CWV, and that it
     must generate full, heap-allocated closures for the operands.
     Either use the module system or type this at the REPL first:

        ,set inline-values

 | ...	
 | For the record, this is how I ran the code:
 | Scheme48: no special command-line options
  ,set inline-values
  ,load soo.scm
  ,collect
  ,time (test-m)
  ,collect
  ,time (test-v)
  ,collect
  ,time (test-mm)
  ,collect
  ,time (test-vv)
 | ...


  
The following are test-results in Scheme48 as instructed by you.

;;; mu-nu.scm
(define-structure mu-nu
  (export ((mu nu) :syntax))
  (open scheme)
  (begin
(define-syntax mu
  (syntax-rules ()
    ((mu argument ...)
     (lambda (m) (m argument ...)))))
(define-syntax nu
  (syntax-rules ()
    ((nu argument ...)
     (lambda (n) (apply n argument ...)))))
))

;;; mu-test.scm
(define-structure mu-test
  (export test-m test-v test-mm test-vv) 
  (open scheme srfi-8 mu-nu)
  (begin
(define m (mu 1 2 3))
(define v (lambda () (values 1 2 3)))
(define mm (lambda (x)
             (if (< x 0)
                 (mu 1 2 3)
                 (if (= x 0)
                     (mu 4 5 6)
                     (mu 7 8 9)))))
(define vv (lambda (x)
             (if (< x 0)
                 (values 1 2 3)
                 (if (= x 0)
                     (values 4 5 6)
                     (values 7 8 9)))))
(define-syntax dotimes
  (syntax-rules ()
    ((dotimes (i count) body0 body1 ...)
     (let ((%COUNT count))
       (do ((i 0 (+ i 1)))
           ((= i %COUNT))
         body0
         body1
         ...)))))
(define (test-m)
  (dotimes (i 10000000)
    (m (lambda (x y z)
         (+ i x y z)))))
(define (test-v)
  (dotimes (i 10000000)
    (receive (x y z) (v)
      (+ i x y z))))
(define (test-mm)
  (dotimes (i 10000000)
    ((mm i) (lambda (x y z)
              (+ i x y z)))))
(define (test-vv)
  (dotimes (i 10000000)
    (receive (x y z) (vv i)
      (+ i x y z))))
))      

;;; mu-unfair-test.scm
(define-syntax mu
  (syntax-rules ()
    ((mu argument ...)
     (lambda (m) (m argument ...)))))
(define-syntax receive
  (syntax-rules ()
    ((receive formals expression body ...)
     (call-with-values (lambda () expression)
                       (lambda formals body ...)))))    
(define m (mu 1 2 3))
(define v (lambda () (values 1 2 3)))
(define mm (lambda (x)
             (if (< x 0)
                 (mu 1 2 3)
                 (if (= x 0)
                     (mu 4 5 6)
                     (mu 7 8 9)))))
(define vv (lambda (x)
             (if (< x 0)
                 (values 1 2 3)
                 (if (= x 0)
                     (values 4 5 6)
                     (values 7 8 9)))))
(define-syntax dotimes
  (syntax-rules ()
    ((dotimes (i count) body0 body1 ...)
     (let ((%COUNT count))
       (do ((i 0 (+ i 1)))
           ((= i %COUNT))
         body0
         body1
         ...)))))
(define (test-m)
  (dotimes (i 10000000)
    (m (lambda (x y z)
         (+ i x y z)))))
(define (test-v)
  (dotimes (i 10000000)
    (receive (x y z) (v)
      (+ i x y z))))
(define (test-mm)
  (dotimes (i 10000000)
    ((mm i) (lambda (x y z)
              (+ i x y z)))))
(define (test-vv)
  (dotimes (i 10000000)
    (receive (x y z) (vv i)
      (+ i x y z))))
;;;

soo@INITERM:~$ scheme48
Welcome to Scheme 48 1.3 (made by soo on Mon Jul 11 09:51:36     2005)
Copyright (c) 1993-2005 by Richard Kelsey and Jonathan Rees.
Please report bugs to scheme-48-bugs@xxxxxxxx
Get more information at http://www.s48.org/.
Type ,? (comma question-mark) for help.
> ,set inline-values
will compile some calls in line
> ,load mu-unfair-test.scm 
> ,collect
Before: 868227 words free in semispace
After:  983100 words free in semispace
> ,time (test-m)
Run time: 22.66 seconds; Elapsed time: 23.04 seconds
#t
> ,collect
Before: 71195 words free in semispace
After:  983088 words free in semispace
> ,time (test-v)
Run time: 30.00 seconds; Elapsed time: 35.09 seconds
#t
> ,collect
Before: 515503 words free in semispace
After:  983088 words free in semispace
> ,time (test-mm)
Run time: 33.34 seconds; Elapsed time: 35.70 seconds
#t
> ,collect
Before: 523639 words free in semispace
After:  983088 words free in semispace
> ,time (test-vv)
Run time: 35.99 seconds; Elapsed time: 36.33 seconds
#t
> ,exit
soo@INITERM:~$ scheme48
Welcome to Scheme 48 1.3 (made by soo on Mon Jul 11 09:51:36     2005)
Copyright (c) 1993-2005 by Richard Kelsey and Jonathan Rees.
Please report bugs to scheme-48-bugs@xxxxxxxx
Get more information at http://www.s48.org/.
Type ,? (comma question-mark) for help.
> ,config ,load mu-nu.scm mu-test.scm
> ,open mu-test
> ,collect
Before: 828046 words free in semispace
After:  980846 words free in semispace
> ,time (test-m)
Run time: 22.63 seconds; Elapsed time: 24.66 seconds
#t
> ,collect
Before: 933975 words free in semispace
After:  980828 words free in semispace
> ,time (test-v)
Run time: 29.03 seconds; Elapsed time: 29.39 seconds
#t
> ,collect
Before: 340484 words free in semispace
After:  980822 words free in semispace
> ,time (test-mm)
Run time: 33.10 seconds; Elapsed time: 35.27 seconds
#t
> ,collect
Before: 337016 words free in semispace
After:  980816 words free in semispace
> ,time (test-vv)
Run time: 35.89 seconds; Elapsed time: 41.16 seconds
#t


Still, my results are different from yous.

--
Joo ChurlSoo