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;;; From from http://www.ccs.neu.edu/home/will/Twobit/KVW/string.txt .
; string test
; (try 100000)
(define s "abcdef")
(define (grow)
(set! s (string-append "123" s "456" s "789"))
(set! s (string-append
(substring s (quotient (string-length s) 2) (string-length s))
(substring s 0 (+ 1 (quotient (string-length s) 2)))))
s)
(define (trial n)
(do ((i 0 (+ i 1)))
((> (string-length s) n) (string-length s))
(grow)))
(define (try n)
(do ((i 0 (+ i 1)))
((>= i 10) (string-length s))
(set! s "abcdef")
(trial n)))
(try 50000000) |