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76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
"""High-perfomance logging profiler, mostly written in C."""
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import _hotshot
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from _hotshot import ProfilerError
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class Profile:
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def __init__(self, logfn, lineevents=0, linetimings=1):
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self.lineevents = lineevents and 1 or 0
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self.linetimings = (linetimings and lineevents) and 1 or 0
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self._prof = p = _hotshot.profiler(
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logfn, self.lineevents, self.linetimings)
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# Attempt to avoid confusing results caused by the presence of
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# Python wrappers around these functions, but only if we can
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# be sure the methods have not been overridden or extended.
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if self.__class__ is Profile:
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self.close = p.close
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self.start = p.start
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self.stop = p.stop
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self.addinfo = p.addinfo
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def close(self):
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"""Close the logfile and terminate the profiler."""
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self._prof.close()
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def fileno(self):
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"""Return the file descriptor of the profiler's log file."""
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return self._prof.fileno()
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def start(self):
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"""Start the profiler."""
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self._prof.start()
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def stop(self):
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"""Stop the profiler."""
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self._prof.stop()
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def addinfo(self, key, value):
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"""Add an arbitrary labelled value to the profile log."""
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self._prof.addinfo(key, value)
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# These methods offer the same interface as the profile.Profile class,
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# but delegate most of the work to the C implementation underneath.
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def run(self, cmd):
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"""Profile an exec-compatible string in the script
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environment.
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The globals from the __main__ module are used as both the
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globals and locals for the script.
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"""
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import __main__
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dict = __main__.__dict__
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return self.runctx(cmd, dict, dict)
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def runctx(self, cmd, globals, locals):
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"""Evaluate an exec-compatible string in a specific
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environment.
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The string is compiled before profiling begins.
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"""
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code = compile(cmd, "<string>", "exec")
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self._prof.runcode(code, globals, locals)
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return self
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def runcall(self, func, *args, **kw):
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"""Profile a single call of a callable.
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Additional positional and keyword arguments may be passed
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along; the result of the call is returned, and exceptions are
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allowed to propogate cleanly, while ensuring that profiling is
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disabled on the way out.
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"""
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return self._prof.runcall(func, args, kw)
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