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118 lines
4.2 KiB
EmacsLisp
118 lines
4.2 KiB
EmacsLisp
;;; benchmark.el --- support for benchmarking code
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;; Copyright (C) 2003-2012 Free Software Foundation, Inc.
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;; Author: Dave Love <fx@gnu.org>
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;; Keywords: lisp, extensions
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Utilities for timing the execution of forms, including the time
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;; taken for GC. Note that prior to timing code you may want to
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;; ensure things like: there has just been a GC, the relevant code is
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;; already loaded (so that there's no overhead from autoloading etc.),
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;; and the code is compiled if appropriate (but see
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;; `benchmark-run-compiled').
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;;; Code:
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(defmacro benchmark-elapse (&rest forms)
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"Return the time in seconds elapsed for execution of FORMS."
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(let ((t1 (make-symbol "t1"))
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(t2 (make-symbol "t2")))
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`(let (,t1 ,t2)
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(setq ,t1 (current-time))
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,@forms
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(setq ,t2 (current-time))
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(float-time (time-subtract ,t2 ,t1)))))
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(put 'benchmark-elapse 'edebug-form-spec t)
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(put 'benchmark-elapse 'lisp-indent-function 0)
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;;;###autoload
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(defmacro benchmark-run (&optional repetitions &rest forms)
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"Time execution of FORMS.
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If REPETITIONS is supplied as a number, run forms that many times,
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accounting for the overhead of the resulting loop. Otherwise run
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FORMS once.
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Return a list of the total elapsed time for execution, the number of
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garbage collections that ran, and the time taken by garbage collection.
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See also `benchmark-run-compiled'."
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(unless (natnump repetitions)
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(setq forms (cons repetitions forms)
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repetitions 1))
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(let ((i (make-symbol "i"))
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(gcs (make-symbol "gcs"))
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(gc (make-symbol "gc")))
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`(let ((,gc gc-elapsed)
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(,gcs gcs-done))
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(list ,(if (> repetitions 1)
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;; Take account of the loop overhead.
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`(- (benchmark-elapse (dotimes (,i ,repetitions)
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,@forms))
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(benchmark-elapse (dotimes (,i ,repetitions))))
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`(benchmark-elapse ,@forms))
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(- gcs-done ,gcs)
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(- gc-elapsed ,gc)))))
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(put 'benchmark-run 'edebug-form-spec t)
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(put 'benchmark-run 'lisp-indent-function 2)
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;;;###autoload
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(defmacro benchmark-run-compiled (&optional repetitions &rest forms)
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"Time execution of compiled version of FORMS.
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This is like `benchmark-run', but what is timed is a funcall of the
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byte code obtained by wrapping FORMS in a `lambda' and compiling the
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result. The overhead of the `lambda's is accounted for."
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(unless (natnump repetitions)
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(setq forms (cons repetitions forms)
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repetitions 1))
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(let ((i (make-symbol "i"))
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(gcs (make-symbol "gcs"))
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(gc (make-symbol "gc"))
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(code (byte-compile `(lambda () ,@forms)))
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(lambda-code (byte-compile `(lambda ()))))
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`(let ((,gc gc-elapsed)
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(,gcs gcs-done))
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(list ,(if (> repetitions 1)
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;; Take account of the loop overhead.
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`(- (benchmark-elapse (dotimes (,i ,repetitions)
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(funcall ,code)))
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(benchmark-elapse (dotimes (,i ,repetitions)
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(funcall ,lambda-code))))
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`(benchmark-elapse (funcall ,code)))
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(- gcs-done ,gcs) (- gc-elapsed ,gc)))))
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(put 'benchmark-run-compiled 'edebug-form-spec t)
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(put 'benchmark-run-compiled 'lisp-indent-function 2)
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;;;###autoload
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(defun benchmark (repetitions form)
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"Print the time taken for REPETITIONS executions of FORM.
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Interactively, REPETITIONS is taken from the prefix arg.
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For non-interactive use see also `benchmark-run' and
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`benchmark-run-compiled'."
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(interactive "p\nxForm: ")
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(let ((result (eval `(benchmark-run ,repetitions ,form))))
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(if (zerop (nth 1 result))
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(message "Elapsed time: %fs" (car result))
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(message "Elapsed time: %fs (%fs in %d GCs)" (car result)
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(nth 2 result) (nth 1 result)))))
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(provide 'benchmark)
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;;; benchmark.el ends here
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