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Text File  |  2005-10-28  |  3KB  |  94 lines
  1. """Statistics analyzer for HotShot."""
  2.  
  3. import profile
  4. import pstats
  5.  
  6. import hotshot.log
  7.  
  8. from hotshot.log import ENTER, EXIT
  9.  
  10.  
  11. def load(filename):
  12.     return StatsLoader(filename).load()
  13.  
  14.  
  15. class StatsLoader:
  16.     def __init__(self, logfn):
  17.         self._logfn = logfn
  18.         self._code = {}
  19.         self._stack = []
  20.         self.pop_frame = self._stack.pop
  21.  
  22.     def load(self):
  23.         # The timer selected by the profiler should never be used, so make
  24.         # sure it doesn't work:
  25.         p = Profile()
  26.         p.get_time = _brokentimer
  27.         log = hotshot.log.LogReader(self._logfn)
  28.         taccum = 0
  29.         for event in log:
  30.             what, (filename, lineno, funcname), tdelta = event
  31.             if tdelta > 0:
  32.                 taccum += tdelta
  33.  
  34.             # We multiply taccum to convert from the microseconds we
  35.             # have to the seconds that the profile/pstats module work
  36.             # with; this allows the numbers to have some basis in
  37.             # reality (ignoring calibration issues for now).
  38.  
  39.             if what == ENTER:
  40.                 frame = self.new_frame(filename, lineno, funcname)
  41.                 p.trace_dispatch_call(frame, taccum * .000001)
  42.                 taccum = 0
  43.  
  44.             elif what == EXIT:
  45.                 frame = self.pop_frame()
  46.                 p.trace_dispatch_return(frame, taccum * .000001)
  47.                 taccum = 0
  48.  
  49.             # no further work for line events
  50.  
  51.         assert not self._stack
  52.         return pstats.Stats(p)
  53.  
  54.     def new_frame(self, *args):
  55.         # args must be filename, firstlineno, funcname
  56.         # our code objects are cached since we don't need to create
  57.         # new ones every time
  58.         try:
  59.             code = self._code[args]
  60.         except KeyError:
  61.             code = FakeCode(*args)
  62.             self._code[args] = code
  63.         # frame objects are create fresh, since the back pointer will
  64.         # vary considerably
  65.         if self._stack:
  66.             back = self._stack[-1]
  67.         else:
  68.             back = None
  69.         frame = FakeFrame(code, back)
  70.         self._stack.append(frame)
  71.         return frame
  72.  
  73.  
  74. class Profile(profile.Profile):
  75.     def simulate_cmd_complete(self):
  76.         pass
  77.  
  78.  
  79. class FakeCode:
  80.     def __init__(self, filename, firstlineno, funcname):
  81.         self.co_filename = filename
  82.         self.co_firstlineno = firstlineno
  83.         self.co_name = self.__name__ = funcname
  84.  
  85.  
  86. class FakeFrame:
  87.     def __init__(self, code, back):
  88.         self.f_back = back
  89.         self.f_code = code
  90.  
  91.  
  92. def _brokentimer():
  93.     raise RuntimeError, "this timer should not be called"
  94.