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- ;;; profile.el --- basic profiling commands for XEmacs
-
- ;; Copyright (C) 1996 Ben Wing, (C) 1997 Free Software Foundation.
-
- ;; Maintainer: XEmacs Development Team
- ;; Keywords: internal
-
- ;; This file is part of XEmacs.
-
- ;; XEmacs is free software; you can redistribute it and/or modify it
- ;; under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; XEmacs is distributed in the hope that it will be useful, but
- ;; WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- ;; General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with XEmacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Synched up with: Not in FSF.
-
- ;;; Commentary:
-
- ;; In addition to Lisp-based `elp', XEmacs provides a set of
- ;; primitives able to profile evaluation of Lisp functions, created by
- ;; the illustrious Ben Wing. The functions in this file can be used
- ;; to gain easy access to the internal profiling functions.
-
- ;; The profiler works by catching "ticks" (actually SIGPROF signals),
- ;; and looking at the current Lisp function, at the time of each tick.
- ;; The output of this process is an alist with keys being the
- ;; functions, and values being the number of ticks per function. From
- ;; this, `profiling-results' easily extracts the total number of
- ;; Unless stated otherwise, profiling info is being accumulated
- ;; incrementally through several profile runs (the current info is
- ;; always available by `get-profiling-info'). Use
- ;; `clear-profiling-info' to break the accumulation chain.
-
- ;; Caveats (ELP users should read this):
- ;; 1) The time reported is function time, rather than
- ;; function+descendants time;
- ;; 2) Each tick is equivalent to 1ms (which can be changed), but this
- ;; is CPU time (user+kernel), not the real time;
- ;; 3) Only the actuall funcalls are profiled. If a subr Ffoo calls
- ;; Fbar using Fbar (), only Ffoo will appear in the profile.
-
- ;; A typical profiling session consists of using `clear-profiling-info'
- ;; followed by `profile' or `profile-key-sequence', followed by
- ;; `profiling-results'.
-
- ;; For instance, to see where Gnus spends time when generating Summary
- ;; buffer, go to the group buffer, and press `M-x clear-profiling-info'
- ;; followed by `M-x profile-key-sequence RET SPC'.
-
-
- ;;; Code:
-
- ;;;###autoload
- (defun profile-results (&optional info stream)
- "Print profiling info INFO to STREAM in a pretty format.
- If INFO is omitted, the current profiling info is retrieved using
- `get-profiling-info'.
- If STREAM is omitted, either a *Profiling Results* buffer or standard
- output are used, depending on whether the function was called
- interactively or not."
- (interactive)
- (setq info (if info
- (copy-alist info)
- (get-profiling-info)))
- (when (and (not stream)
- (interactive-p))
- (pop-to-buffer (get-buffer-create "*Profiling Results*"))
- (erase-buffer))
- (let ((standard-output (or stream (if (interactive-p)
- (current-buffer)
- standard-output)))
- ;; Calculate the longest function
- (maxfunlen (apply #'max
- (length "Function Name")
- (mapcar
- (lambda (el)
- ;; Functions longer than 50 characters (usually
- ;; anonymous functions) don't qualify
- (let ((l (length (format "%s" (car el)))))
- (if (< l 50)
- l 0)))
- info))))
- (princ (format "%-*s Ticks %%/Total\n" maxfunlen "Function Name"))
- (princ (make-string maxfunlen ?=))
- (princ " ===== =======\n")
- (let ((sum (float (apply #'+ (mapcar #'cdr info)))))
- (dolist (entry (nreverse (sort info #'cdr-less-than-cdr)))
- (princ (format "%-*s %-5d %-6.3f\n"
- maxfunlen (car entry) (cdr entry)
- (* 100 (/ (cdr entry) sum)))))
- (princ (make-string maxfunlen ?-))
- (princ "--------------------\n")
- (princ (format "%-*s %-5d %-6.2f\n" maxfunlen "Total" sum 100.0))
- (princ (format "\n\nOne tick = %g ms\n"
- (/ default-profiling-interval 1000.0)))))
- (when (and (not stream)
- (interactive-p))
- (goto-char (point-min))))
-
- ;; Support the old name for a while.
- (define-obsolete-function-alias 'pretty-print-profiling-info
- 'profile-results)
-
- ;;;###autoload
- (defmacro profile (&rest forms)
- "Turn on profiling, execute FORMS and restore profiling state.
- Profiling state here means that if profiling was not in effect when
- PROFILE was called, it will be turned off after FORMS are evaluated.
- Otherwise, profiling will be left running.
-
- Returns the profiling info, printable by `profiling-results'."
- `(let ((was-profiling (profiling-active-p)))
- (unwind-protect
- (progn
- (start-profiling)
- ,@forms)
- (unless was-profiling
- (stop-profiling)))
- (get-profiling-info)))
-
- (put 'profile 'lisp-indent-function 0)
-
- ;;;###autoload
- (defun profile-key-sequence (keys)
- "Dispatch the key sequence KEYS and profile the execution.
- KEYS can be a vector of keypress events, a keypress event, or a character.
- The function returns the profiling info."
- (interactive "kProfile keystroke: ")
- (and (characterp keys)
- (setq keys (character-to-event keys)))
- (or (vectorp keys)
- (setq keys (vector keys)))
- (profile
- (mapc 'dispatch-event keys)))
-
- ;;; profile.el ends here
-