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(require (in-vicinity (implementation-vicinity) "pi.scm"))
(require 'transcript)
(define isqrt
(cond ((provided? 'inexact) sqrt)
(else (require 'root) integer-sqrt)))
(define i/
(cond ((provided? 'inexact) /)
(else quotient)))
(define around
(cond ((provided? 'inexact)
(lambda (x)
(cond ((>= 3000 (abs x) 3) (inexact->exact (round x)))
(else x))))
(else identity)))
(define (time-pi digits)
(let ((start-time (get-internal-run-time)))
(pi digits 4)
(i/ (* 1000 (- (get-internal-run-time) start-time))
internal-time-units-per-second)))
(define (benchmark . arg)
(define file
(cond ((null? arg) "bench.log")
(else (car arg))))
(do ((digits 50 (+ digits digits))
(t 0 (time-pi (+ digits digits))))
((> t 3000)
(do ((tl '() (cons (time-pi digits) tl))
(j 12 (+ -1 j)))
((zero? j)
(let* ((avg (i/ (apply + tl) (length tl)))
(dev (isqrt (i/ (apply
+ (map (lambda (x) (* (- x avg) (- x avg)))
tl))
(length tl)))))
(and file (transcript-on file))
(for-each display
(list digits " digits took " (around avg) " mSec +/- "
(around dev) " mSec."))
(newline)
(let ((scaled-avg (i/ (* (i/ (* avg 1000) digits) 1000) digits)))
(for-each display
(list " That is about " scaled-avg
" mSec/k-digit^2 +/- "
(around
(i/ (* 100 (i/ (* (i/ (* dev 1000) digits)
1000) digits))
scaled-avg))
"%."))
(newline)
(and file (transcript-off)))
))))))
(benchmark)
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