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|
;;; memory-usage.el --- Analyze the memory usage of Emacs in various ways
;; Copyright (C) 2002, 2004, 2012 Free Software Foundation, Inc.
;; Author: Stefan Monnier <monnier@cs.yale.edu>
;; Keywords: maint
;; Version: 0.2
;; This file 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.
;; This file 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This package provides the command `memory-usage', which lists all
;; buffers and how much memory they use.
;;; Code:
(defvar memory-usage-word-size (ceiling (/ (log most-positive-fixnum 2) 8))
"Size of a Lisp word box in bytes.")
(defun memory-usage-buffer-size-bytes (b)
"Return total number of bytes in the buffer contents."
(with-current-buffer b
(save-restriction
(widen)
(- (position-bytes (point-max)) (position-bytes (point-min))))))
(defun memory-usage-buffer-gap-bytes (b)
"Return total number of bytes in the buffer gap."
(with-current-buffer b
(gap-size)))
(defun memory-usage-buffer-total-bytes (b)
"Return total number of ralloc bytes used by buffer."
(with-current-buffer b
(save-restriction
(widen)
(+ (position-bytes (point-max))
(- (position-bytes (point-min)))
(gap-size)))))
(defun memory-usage-mult-cons (n c)
(setq n (* n memory-usage-word-size))
(cons (* n (car c)) (* n (cdr c))))
(defun memory-usage-format (bytes)
(setq bytes (/ bytes 1024.0))
(let ((units '(;; "B"
"kB" "MB" "GB" "TB")))
(while (>= bytes 1024)
(setq bytes (/ bytes 1024.0))
(setq units (cdr units)))
(cond
;; ((integerp bytes) (format "%4d%s" bytes (car units)))
((>= bytes 100) (format "%4.0f%s" bytes (car units)))
((>= bytes 10) (format "%4.1f%s" bytes (car units)))
(t (format "%4.2f%s" bytes (car units))))))
;;;###autoload
(defun memory-usage ()
"List all buffers and their memory usage."
(interactive)
(pop-to-buffer (get-buffer-create "*Buffer Details*"))
(erase-buffer)
(let* ((bufs (buffer-list))
(num (length bufs))
(gc-stats (garbage-collect))
(gc-stats (if (numberp (caar gc-stats))
(mapcar (lambda (x)
`(,(car x)
,(max (* memory-usage-word-size (cadr x))
1)
,@(let ((stat (nth (cddr x) gc-stats)))
(if (consp stat)
(list (car stat) (cdr stat))
(list stat)))))
'((cons 2 . 0)
(symbol 6 . 1)
(marker 5 . 2)
(string 4 . 7)
(string-byte 0 . 3)
(vector-slot 1 . 4)
(float 2 . 5)
(interval 7 . 6)))
gc-stats)))
(insert (format "Garbage collection stats:\n%s\n\n =>" gc-stats))
(let ((live 0)
(dead 0))
(dolist (x gc-stats)
(let* ((size (nth 1 x))
(xlive (* size (nth 2 x)))
(xdead (if (nth 3 x) (* size (nth 3 x)))))
(insert (if xdead
(format "\t%s (+ %s dead) in %s\n"
(memory-usage-format xlive)
(memory-usage-format xdead)
(car x))
(format "\t%s in %s\n"
(memory-usage-format xlive)
(car x))))
(setq live (+ live xlive))
(if xdead (setq dead (+ dead xdead)))))
(insert (format "\nTotal in lisp objects: %s (live %s, dead %s)\n\n"
(memory-usage-format (+ dead live))
(memory-usage-format live)
(memory-usage-format dead))))
(insert
(format "Buffer ralloc memory usage:\n%d buffers\n%s total (%s in gaps)\n"
num
(memory-usage-format
(apply #'+ (mapcar #'memory-usage-buffer-total-bytes bufs)))
(memory-usage-format
(apply #'+ (mapcar #'memory-usage-buffer-gap-bytes bufs)))))
(insert (format "%10s\t%s\t%s\n\n" "Size" "Gap" "Name"))
(insert (mapconcat
(lambda (b)
(format "%10d\t%s\t%s"
(memory-usage-buffer-size-bytes b)
(memory-usage-buffer-gap-bytes b)
(buffer-name b)))
(sort bufs (lambda (b1 b2)
(> (memory-usage-buffer-size-bytes b1)
(memory-usage-buffer-size-bytes b2))))
"\n"))
(insert "\n"))
(goto-char (point-min)))
(defun memory-usage-find-large-variables ()
"Find variables whose printed representation takes over 100KB."
(interactive)
(let ((min-size (* 100 1024)))
(pop-to-buffer "*Memory Explorer*")
(delete-region (point-min) (point-max))
;; First find large global variables.
(mapatoms
(lambda (sym)
(let ((size (or (and (boundp sym)
(length (prin1-to-string (symbol-value sym))))
0)))
(when (> size min-size)
(insert (format "%d\tGlobal\t%s\n"
size
(symbol-name sym)))))))
;; Second find large buffer-local variables.
(mapc
(lambda (buffer)
(let ((holder ""))
(with-current-buffer buffer
(mapc
(lambda (var-cons)
(let ((size (or (and (consp var-cons)
(length (prin1-to-string (cdr var-cons))))
0)))
(if (> size min-size)
(setq holder (format "%d\t%s\t%s\n"
size (buffer-name buffer)
(symbol-name (car var-cons)))))))
(buffer-local-variables)))
(insert holder)))
(buffer-list))
(sort-numeric-fields 1 (point-min) (point-max))))
(provide 'memory-usage)
;;; memory-usage.el ends here
|
