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cProfile.py6.2 KB · 192 lines
#! /usr/bin/python3.9 """Python interface for the 'lsprof' profiler.   Compatible with the 'profile' module.""" __all__ = ["run", "runctx", "Profile"] import _lsprofimport ioimport profile as _pyprofile # ____________________________________________________________# Simple interface def run(statement, filename=None, sort=-1):    return _pyprofile._Utils(Profile).run(statement, filename, sort) def runctx(statement, globals, locals, filename=None, sort=-1):    return _pyprofile._Utils(Profile).runctx(statement, globals, locals,                                             filename, sort) run.__doc__ = _pyprofile.run.__doc__runctx.__doc__ = _pyprofile.runctx.__doc__ # ____________________________________________________________ class Profile(_lsprof.Profiler):    """Profile(timer=None, timeunit=None, subcalls=True, builtins=True)     Builds a profiler object using the specified timer function.    The default timer is a fast built-in one based on real time.    For custom timer functions returning integers, timeunit can    be a float specifying a scale (i.e. how long each integer unit    is, in seconds).    """     # Most of the functionality is in the base class.    # This subclass only adds convenient and backward-compatible methods.     def print_stats(self, sort=-1):        import pstats        pstats.Stats(self).strip_dirs().sort_stats(sort).print_stats()     def dump_stats(self, file):        import marshal        with open(file, 'wb') as f:            self.create_stats()            marshal.dump(self.stats, f)     def create_stats(self):        self.disable()        self.snapshot_stats()     def snapshot_stats(self):        entries = self.getstats()        self.stats = {}        callersdicts = {}        # call information        for entry in entries:            func = label(entry.code)            nc = entry.callcount         # ncalls column of pstats (before '/')            cc = nc - entry.reccallcount # ncalls column of pstats (after '/')            tt = entry.inlinetime        # tottime column of pstats            ct = entry.totaltime         # cumtime column of pstats            callers = {}            callersdicts[id(entry.code)] = callers            self.stats[func] = cc, nc, tt, ct, callers        # subcall information        for entry in entries:            if entry.calls:                func = label(entry.code)                for subentry in entry.calls:                    try:                        callers = callersdicts[id(subentry.code)]                    except KeyError:                        continue                    nc = subentry.callcount                    cc = nc - subentry.reccallcount                    tt = subentry.inlinetime                    ct = subentry.totaltime                    if func in callers:                        prev = callers[func]                        nc += prev[0]                        cc += prev[1]                        tt += prev[2]                        ct += prev[3]                    callers[func] = nc, cc, tt, ct     # The following two methods can be called by clients to use    # a profiler to profile a statement, given as a string.     def run(self, cmd):        import __main__        dict = __main__.__dict__        return self.runctx(cmd, dict, dict)     def runctx(self, cmd, globals, locals):        self.enable()        try:            exec(cmd, globals, locals)        finally:            self.disable()        return self     # This method is more useful to profile a single function call.    def runcall(self, func, /, *args, **kw):        self.enable()        try:            return func(*args, **kw)        finally:            self.disable()     def __enter__(self):        self.enable()        return self     def __exit__(self, *exc_info):        self.disable() # ____________________________________________________________ def label(code):    if isinstance(code, str):        return ('~', 0, code)    # built-in functions ('~' sorts at the end)    else:        return (code.co_filename, code.co_firstlineno, code.co_name) # ____________________________________________________________ def main():    import os    import sys    import runpy    import pstats    from optparse import OptionParser    usage = "cProfile.py [-o output_file_path] [-s sort] [-m module | scriptfile] [arg] ..."    parser = OptionParser(usage=usage)    parser.allow_interspersed_args = False    parser.add_option('-o', '--outfile', dest="outfile",        help="Save stats to <outfile>", default=None)    parser.add_option('-s', '--sort', dest="sort",        help="Sort order when printing to stdout, based on pstats.Stats class",        default=-1,        choices=sorted(pstats.Stats.sort_arg_dict_default))    parser.add_option('-m', dest="module", action="store_true",        help="Profile a library module", default=False)     if not sys.argv[1:]:        parser.print_usage()        sys.exit(2)     (options, args) = parser.parse_args()    sys.argv[:] = args     # The script that we're profiling may chdir, so capture the absolute path    # to the output file at startup.    if options.outfile is not None:        options.outfile = os.path.abspath(options.outfile)     if len(args) > 0:        if options.module:            code = "run_module(modname, run_name='__main__')"            globs = {                'run_module': runpy.run_module,                'modname': args[0]            }        else:            progname = args[0]            sys.path.insert(0, os.path.dirname(progname))            with io.open_code(progname) as fp:                code = compile(fp.read(), progname, 'exec')            globs = {                '__file__': progname,                '__name__': '__main__',                '__package__': None,                '__cached__': None,            }        try:            runctx(code, globs, None, options.outfile, options.sort)        except BrokenPipeError as exc:            # Prevent "Exception ignored" during interpreter shutdown.            sys.stdout = None            sys.exit(exc.errno)    else:        parser.print_usage()    return parser # When invoked as main program, invoke the profiler on a scriptif __name__ == '__main__':    main()