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.startswith("SyS_"): continue
  24             if name.startswith("compat_SyS_"): continue
  25             if name == "linux_banner": continue
  26             # statics and some other optimizations adds random .NUMBER
  27             name = re.sub(r'\.[0-9]+', '', name)
  28             sym[name] = sym.get(name, 0) + int(size, 16)
  29     return sym
  30
  31 old = getsizes(sys.argv[1])
  32 new = getsizes(sys.argv[2])
  33 grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
  34 delta, common = [], {}
  35 otot, ntot = 0, 0
  36
  37 for a in old:
  38     if a in new:
  39         common[a] = 1
  40
  41 for name in old:
  42     otot += old[name]
  43     if name not in common:
  44         remove += 1
  45         down += old[name]
  46         delta.append((-old[name], name))
  47
  48 for name in new:
  49     ntot += new[name]
  50     if name not in common:
  51         add += 1
  52         up += new[name]
  53         delta.append((new[name], name))
  54
  55 for name in common:
  56         d = new.get(name, 0) - old.get(name, 0)
  57         if d>0: grow, up = grow+1, up+d
  58         if d<0: shrink, down = shrink+1, down-d
  59         delta.append((d, name))
  60
  61 delta.sort()
  62 delta.reverse()
  63
  64 print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
  65       (add, remove, grow, shrink, up, -down, up-down))
  66 print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
  67 for d, n in delta:
  68     if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
  69
  70 print("Total: Before=%d, After=%d, chg %+.2f%%" % \
  71     (otot, ntot, (ntot - otot)*100.0/otot))