scripts/bloat-o-meter

   1 #!/usr/bin/python
   2 #
   3 # Copyright 2004 Matt Mackall <mpm@selenic.com>
   4 #
   5 # inspired by perl Bloat-O-Meter (c) 1997 by Andi Kleen
   6 #
   7 # This software may be used and distributed according to the terms
   8 # of the GNU General Public License, incorporated herein by reference.
   9
  10 import sys, os, re
  11
  12 if len(sys.argv) != 3:
  13     sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
  14     sys.exit(-1)
  15
  16 def getsizes(file):
  17     sym = {}
  18     for l in os.popen("nm --size-sort " + file).readlines():
  19         size, type, name = l[:-1].split()
  20         if type in "tTdDbBrR":
  21             # strip generated symbols
  22             if name.startswith("__mod_"): continue
  23             if name == "linux_banner": continue
  24             # statics and some other optimizations adds random .NUMBER
  25             name = re.sub(r'\.[0-9]+', '', name)
  26             sym[name] = sym.get(name, 0) + int(size, 16)
  27     return sym
  28
  29 old = getsizes(sys.argv[1])
  30 new = getsizes(sys.argv[2])
  31 grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
  32 delta, common = [], {}
  33
  34 for a in old:
  35     if a in new:
  36         common[a] = 1
  37
  38 for name in old:
  39     if name not in common:
  40         remove += 1
  41         down += old[name]
  42         delta.append((-old[name], name))
  43
  44 for name in new:
  45     if name not in common:
  46         add += 1
  47         up += new[name]
  48         delta.append((new[name], name))
  49
  50 for name in common:
  51         d = new.get(name, 0) - old.get(name, 0)
  52         if d>0: grow, up = grow+1, up+d
  53         if d<0: shrink, down = shrink+1, down-d
  54         delta.append((d, name))
  55
  56 delta.sort()
  57 delta.reverse()
  58
  59 print "add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
  60       (add, remove, grow, shrink, up, -down, up-down)
  61 print "%-40s %7s %7s %+7s" % ("function", "old", "new", "delta")
  62 for d, n in delta:
  63     if d: print "%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d)