<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=UTF-8" http-equiv="Content-Type"> </head> <body alink="#ee0000" bgcolor="#ffffff" link="#0000ee" text="#ffffff" vlink="#551a8b"> I was actually benchmarking DrScheme against another flavor of Scheme, and I thought the results were unfair, since DrScheme is also an IDE. So I compiled to .zo (which didn't alter the times appreciably) and ran this little powerset routine in DrScheme and MzScheme with the following results. -------------- THE CODE -------------- (module powerset mzscheme (provide go) (define (power-set s) (if (null? s) (list '()) (let ((rest (power-set (cdr s)))) (append (map (lambda(x) (cons (car s) x)) rest) rest)))) (define (go) (collect-garbage) (time (let ([ps (power-set '(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20))]) 'powerset))) ) -------------- THE RESULTS ------------ Welcome to DrScheme, version 369.8-svn2mar2007 [3m]. Language: Textual (MzScheme, includes R5RS). > (require powerset) > (go) cpu time: 469 real time: 468 gc time: 265 powerset > (go) cpu time: 469 real time: 469 gc time: 266 powerset ----------------------------------------------------------------------------------- C:\Documents and Settings\kyle\My Documents\Scheme\math>mzscheme -q --require powerset.scm Welcome to MzScheme v369.8 [3m], Copyright (c) 2004-2007 PLT Scheme Inc. > (go) cpu time: 563 real time: 563 gc time: 405 powerset > (go) cpu time: 563 real time: 563 gc time: 376 powerset > (exit) ----------------------------------------------------------------------------------- I was really surprised that DrScheme beat out MzScheme. Do I have something setup wrong on the command line of MzScheme, as I don't often use the stand-alone interpreter, so I could be missing something? <pre class="moz-signature" cols="72">--kyle Kyle Smith airfoil at bellsouth dot net schemekeys.blogspot.com </pre> </body> </html>