ice-9/time.scm

   1 ;;;;    Copyright (C) 2001, 2004, 2006 Free Software Foundation, Inc.
   2 ;;;;
   3 ;;;; This library is free software; you can redistribute it and/or
   4 ;;;; modify it under the terms of the GNU Lesser General Public
   5 ;;;; License as published by the Free Software Foundation; either
   6 ;;;; version 2.1 of the License, or (at your option) any later version.
   7 ;;;;
   8 ;;;; This library is distributed in the hope that it will be useful,
   9 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 ;;;; Lesser General Public License for more details.
  12 ;;;;
  13 ;;;; You should have received a copy of the GNU Lesser General Public
  14 ;;;; License along with this library; if not, write to the Free Software
  15 ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  16 ;;;;
  17 \f
  18 ;;; Commentary:
  19
  20 ;; This module exports a single macro: `time'.
  21 ;; Usage: (time exp)
  22 ;;
  23 ;; Example:
  24 ;; guile> (time (sleep 3))
  25 ;; clock utime stime cutime cstime gctime
  26 ;; 3.01  0.00  0.00   0.00   0.00   0.00
  27 ;; 0
  28
  29 ;;; Code:
  30
  31 (define-module (ice-9 time)
  32   :use-module (ice-9 format)
  33   :export (time))
  34
  35 (define (time-proc proc)
  36   (let* ((gc-start (gc-run-time))
  37          (tms-start (times))
  38          (result (proc))
  39          (tms-end (times))
  40          (gc-end (gc-run-time)))
  41     ;; FIXME: We would probably like format ~f to accept rationals, but
  42     ;; currently it doesn't so we force to a flonum with exact->inexact.
  43     (define (get proc start end)
  44       (exact->inexact (/ (- (proc end) (proc start)) internal-time-units-per-second)))
  45     (display "clock utime stime cutime cstime gctime\n")
  46     (format #t "~5,2F ~5,2F ~5,2F ~6,2F ~6,2F ~6,2F\n"
  47             (get tms:clock tms-start tms-end)
  48             (get tms:utime tms-start tms-end)
  49             (get tms:stime tms-start tms-end)
  50             (get tms:cutime tms-start tms-end)
  51             (get tms:cstime tms-start tms-end)
  52             (get identity gc-start gc-end))
  53     result))
  54
  55 (define-macro (time exp)
  56   `(,time-proc (lambda () ,exp)))
  57
  58 ;;; time.scm ends here