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