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 from signal import signal, SIGPIPE, SIG_DFL
  12
  13 signal(SIGPIPE, SIG_DFL)
  14
  15 if len(sys.argv) != 3:
  16     sys.stderr.write("usage: %s file1 file2\n" % sys.argv[0])
  17     sys.exit(-1)
  18
  19 re_NUMBER = re.compile(r'\.[0-9]+')
  20
  21 def getsizes(file):
  22     sym = {}
  23     with os.popen("nm --size-sort " + file) as f:
  24         for line in f:
  25             size, type, name = line.split()
  26             if type in "tTdDbBrR":
  27                 # strip generated symbols
  28                 if name.startswith("__mod_"): continue
  29                 if name.startswith("SyS_"): continue
  30                 if name.startswith("compat_SyS_"): continue
  31                 if name == "linux_banner": continue
  32                 # statics and some other optimizations adds random .NUMBER
  33                 name = re_NUMBER.sub('', name)
  34                 sym[name] = sym.get(name, 0) + int(size, 16)
  35     return sym
  36
  37 old = getsizes(sys.argv[1])
  38 new = getsizes(sys.argv[2])
  39 grow, shrink, add, remove, up, down = 0, 0, 0, 0, 0, 0
  40 delta, common = [], {}
  41 otot, ntot = 0, 0
  42
  43 for a in old:
  44     if a in new:
  45         common[a] = 1
  46
  47 for name in old:
  48     otot += old[name]
  49     if name not in common:
  50         remove += 1
  51         down += old[name]
  52         delta.append((-old[name], name))
  53
  54 for name in new:
  55     ntot += new[name]
  56     if name not in common:
  57         add += 1
  58         up += new[name]
  59         delta.append((new[name], name))
  60
  61 for name in common:
  62         d = new.get(name, 0) - old.get(name, 0)
  63         if d>0: grow, up = grow+1, up+d
  64         if d<0: shrink, down = shrink+1, down-d
  65         delta.append((d, name))
  66
  67 delta.sort()
  68 delta.reverse()
  69
  70 print("add/remove: %s/%s grow/shrink: %s/%s up/down: %s/%s (%s)" % \
  71       (add, remove, grow, shrink, up, -down, up-down))
  72 print("%-40s %7s %7s %+7s" % ("function", "old", "new", "delta"))
  73 for d, n in delta:
  74     if d: print("%-40s %7s %7s %+7d" % (n, old.get(n,"-"), new.get(n,"-"), d))
  75
  76 print("Total: Before=%d, After=%d, chg %+.2f%%" % \
  77     (otot, ntot, (ntot - otot)*100.0/otot))