My guess would be that we're pushing the PythonContext._callSplatSite outside of the sweet spot in DLR site caches.
You could check this by putting a breakpoint in PythonContext.Call(object, params object[]). Then look and see if _callSplatSite._rules is an instance of EmptyRuleSet<T> with _supportAdding == false. If this is the cause it should be pretty easy to fix - property's should probably get their own call site object so it'll be specialized to the specific property (maybe we could share a common one of the function is a PythonFunction as these generate highly shareable calls between multiple function instances). We're also doing a params call today which we could stop doing and get a nice perf boost on properties. > -----Original Message----- > From: users-boun...@lists.ironpython.com [mailto:users- > boun...@lists.ironpython.com] On Behalf Of Kamil Dworakowski > Sent: Tuesday, December 16, 2008 11:08 AM > To: users@lists.ironpython.com > Subject: [IronPython] weird performance issue > > We see a very strange side effect of running the follwing code on the > performance of recalculations in Resolver One. > > def Dumbcorator(fn): > def _inner(self, *args): > return fn(self, *args) > return _inner > > class Locker(object): > @property > @Dumbcorator > def thing(self): > return 2 > > l = Locker() > l.thing > > Specifically, one of the performance test reports results 4 to 8 times > worse with this snippet in than without (the clock is turned on after > this snippet executes). If I comment out this snippet from the code, > it suddenly runs 4 to 8 times faster. The fact that I can comment it > out means that it is not used in the test, so it is bizzare that it > slows it down. > > We can't reproduce the slow down in a clean example though. I hope > something clicks for somebody and gives me a hint as to what is going > on. Tomorrow I'll continue on trying to minimize the code that is > being slowed down, and hopefully come up with some decent repro. > _______________________________________________ > Users mailing list > Users@lists.ironpython.com > http://lists.ironpython.com/listinfo.cgi/users-ironpython.com _______________________________________________ Users mailing list Users@lists.ironpython.com http://lists.ironpython.com/listinfo.cgi/users-ironpython.com
