benchmark-suite/benchmarks/subr.bm

   1 ;;; subr.bm --- Measure the subr invocation cost.     -*- Scheme -*-
   2 ;;;
   3 ;;; Copyright (C) 2009 Free Software Foundation, Inc.
   4 ;;;
   5 ;;; This program is free software; you can redistribute it and/or
   6 ;;; modify it under the terms of the GNU Lesser General Public License
   7 ;;; as published by the Free Software Foundation; either version 3, or
   8 ;;; (at your option) any later version.
   9 ;;;
  10 ;;; This program is distributed in the hope that it will be useful,
  11 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 ;;; GNU Lesser General Public License for more details.
  14 ;;;
  15 ;;; You should have received a copy of the GNU Lesser General Public
  16 ;;; License along with this software; see the file COPYING.LESSER.  If
  17 ;;; not, write to the Free Software Foundation, Inc., 51 Franklin
  18 ;;; Street, Fifth Floor, Boston, MA 02110-1301 USA
  19
  20 (define-module (benchmarks subrs)
  21   :use-module (benchmark-suite lib))
  22
  23 \f
  24 (define hook1 (make-hook 1))
  25 (define hook3 (make-hook 3))
  26
  27 (with-benchmark-prefix "subr invocation"
  28
  29   (benchmark "simple subr" 700000
  30     ;; 1 required argument, 0 optional arguments, no rest.
  31     (1+ 0))
  32
  33   (benchmark "generic subr" 700000
  34     ;; 2 required arguments, 4 optional arguments, no rest.
  35
  36     ;; In Guile 1.8 and earlier, such subrs are implemented as "compiled
  37     ;; closures" (cclos).  There, when a cclo/gsubr is called, the evaluator
  38     ;; goes through `SCM_APPLY ()' and conses the arguments, which is more
  39     ;; costly than the invocation of a "simple subr".
  40     (string= "foo" "bar"))
  41
  42   (benchmark "generic subr with rest arg" 700000
  43     ;; 1 required argument, 0 optional arguments, 1 rest.
  44     (run-hook hook1 1))
  45
  46   (benchmark "generic subr with rest arg and 3+ parameters" 700000
  47     ;; 1 required argument, 0 optional arguments, 1 rest.
  48
  49     ;; The evaluator considers calls with 3 and more parameters as a general
  50     ;; form and always stores the arguments into a list.
  51     (run-hook hook3 1 2 3)))
  52
  53 \f
  54 (with-benchmark-prefix "subr application"
  55
  56   (benchmark "simple subr" 700000
  57     (apply 1+ '(0)))
  58
  59   (benchmark "generic subr" 700000
  60     (apply string= "foo" '("bar")))
  61
  62   (benchmark "generic subr with rest arg" 700000
  63     (apply run-hook hook1 '(1)))
  64
  65   (benchmark "generic subr with rest arg and 3+ parameters" 700000
  66     (run-hook hook3 1 2 '(3))))