about setting up the dispatch table, and update the OldProfile and
HotProfile classes to the current implementations, showing the adjusted
construction for the dispatch table.
that should be used to cache an interned version of the event
string passed to the profile/trace function. call_trace() will
create interned strings and cache them in using the storage
specified by this additional parameter, avoiding a lot of string
object creation at runtime when using the profiling or tracing
functions.
All call sites are modified to pass the additional parameter, and four
static PyObject* variables are allocated to cache the interned string
objects.
This closes SF patch #431257.
Ensure that all the default timers are called as functions, not an
expensive method wrapper around a variety of different functions.
Agressively avoid dictionary lookups.
Modify the dispatch scheme (Profile.trace_dispatch_*(), where * is not
'call', 'exception' or 'return') so that the callables dispatched to
are simple functions and not bound methods -- this reduces the number
of layers of Python call machinery that gets touched.
Remove a couple of duplicate imports from the "if __name__ == ..."
section.
This closes SF patch #430948.
frequently used, and in particular this allows to drop the last
remaining obvious time-waster in the crucial lookdict() and
lookdict_string() functions. Other changes consist mostly of changing
"i < ma_size" to "i <= ma_mask" everywhere.
be possible to provoke unbounded recursion now, but leaving that to someone
else to provoke and repair.
Bugfix candidate -- although this is getting harder to backstitch, and the
cases it's protecting against are mondo contrived.
code, less memory. Tests have uncovered no drawbacks. Christian and
Vladimir are the other two people who have burned many brain cells on the
dict code in recent years, and they like the approach too, so I'm checking
it in without further ado.
in release builds. Suggested by Martin v. Loewis.
I'm half tempted to macroize PyErr_Occurred too, as the whole thing could
collapse to just
_PyThreadState_Current->curexc_type
random inputs: if you ran the test 100 times, you could expect it to
report a bogus failure. So loosened its expectations.
Also changed the way failing tests are printed, so that when run under
regrtest.py we get enough info to reproduce the failure.
exactly once. But the test code can't know that, as the number of times
__cmp__ is called depends on internal details of the dict implementation.
This is especially nasty because the __hash__ method returns the address
of the class object, so the hash codes seen by the dict can vary across
runs, causing the dict to use a different probe order across runs. I
just happened to see this test fail about 1 run in 7 today, but only
under a release build and when passing -O to Python. So, changed the test
to be predictable across runs.
PySequence_Size(), not PyObject_Size(): the later considers the mapping
methods as well as the sequence methods, which is not needed here. Either
should be equally fast in this case, but PySequence_Size() offers a better
conceptual match.
absolute or relative.
remove(), rename() descriptions: Give more information about the cross-
platform behavior of these functions, so single-platform developers
can be aware of the potential issues when writing portable code.
This closes SF patch #426598.
In the default branch, keep three ifs that are used if level == 0, the
most common case. Note that first if here is a slight optimization
for the 'O' format.
Second part of SF patch 426072.
Fred Drake
Martin v. Löwis
Peter Schneider-Kamp
Marc-André Lemburg
Guido van Rossum
Tim Peters
Skip Montanaro
Mark Hammond
Neil Schemenauer
Jeremy Hylton