| """Statistics analyzer for HotShot.""" |
| |
| import profile |
| import pstats |
| |
| import hotshot.log |
| |
| from hotshot.log import ENTER, EXIT |
| |
| |
| def load(filename): |
| return StatsLoader(filename).load() |
| |
| |
| class StatsLoader: |
| def __init__(self, logfn): |
| self._logfn = logfn |
| self._code = {} |
| self._stack = [] |
| self.pop_frame = self._stack.pop |
| |
| def load(self): |
| # The timer selected by the profiler should never be used, so make |
| # sure it doesn't work: |
| p = Profile() |
| p.get_time = _brokentimer |
| log = hotshot.log.LogReader(self._logfn) |
| taccum = 0 |
| for event in log: |
| what, (filename, lineno, funcname), tdelta = event |
| if tdelta > 0: |
| taccum += tdelta |
| |
| # We multiply taccum to convert from the microseconds we |
| # have to the seconds that the profile/pstats module work |
| # with; this allows the numbers to have some basis in |
| # reality (ignoring calibration issues for now). |
| |
| if what == ENTER: |
| frame = self.new_frame(filename, lineno, funcname) |
| p.trace_dispatch_call(frame, taccum * .000001) |
| taccum = 0 |
| |
| elif what == EXIT: |
| frame = self.pop_frame() |
| p.trace_dispatch_return(frame, taccum * .000001) |
| taccum = 0 |
| |
| # no further work for line events |
| |
| assert not self._stack |
| return pstats.Stats(p) |
| |
| def new_frame(self, *args): |
| # args must be filename, firstlineno, funcname |
| # our code objects are cached since we don't need to create |
| # new ones every time |
| try: |
| code = self._code[args] |
| except KeyError: |
| code = FakeCode(*args) |
| self._code[args] = code |
| # frame objects are create fresh, since the back pointer will |
| # vary considerably |
| if self._stack: |
| back = self._stack[-1] |
| else: |
| back = None |
| frame = FakeFrame(code, back) |
| self._stack.append(frame) |
| return frame |
| |
| |
| class Profile(profile.Profile): |
| def simulate_cmd_complete(self): |
| pass |
| |
| |
| class FakeCode: |
| def __init__(self, filename, firstlineno, funcname): |
| self.co_filename = filename |
| self.co_firstlineno = firstlineno |
| self.co_name = self.__name__ = funcname |
| |
| |
| class FakeFrame: |
| def __init__(self, code, back): |
| self.f_back = back |
| self.f_code = code |
| |
| |
| def _brokentimer(): |
| raise RuntimeError, "this timer should not be called" |
