Commit Graph

13 Commits

Author SHA1 Message Date
Jeremy Hylton 985eba53f5 Small function call optimization and special build option for call stats.
-DCALL_PROFILE: Count the number of function calls executed.

When this symbol is defined, the ceval mainloop and helper functions
count the number of function calls made.  It keeps detailed statistics
about what kind of object was called and whether the call hit any of
the special fast paths in the code.

Optimization:

When we take the fast_function() path, which seems to be taken for
most function calls, and there is minimal frame setup to do, avoid
call PyEval_EvalCodeEx().  The eval code ex function does a lot of
work to handle keywords args and star args, free variables,
generators, etc.  The inlined version simply allocates the frame and
copies the arguments values into the frame.

The optimization gets a little help from compile.c which adds a
CO_NOFREE flag to code objects that don't have free variables or cell
variables.  This change allows fast_function() to get into the fast
path with fewer tests.

I measure a couple of percent speedup in pystone with this change, but
there's surely more that can be done.
2003-02-05 23:13:00 +00:00
Michael W. Hudson 202a4b6fdd Repair fill-paragraph damage.
Clarify LLTRACE description.  It was introduced in 1992, revision 2.20 of
ceval.c, well before Python 1.0!
2002-07-30 15:25:57 +00:00
Michael W. Hudson a6255238b2 add description of LLTRACE. 2002-07-30 09:49:29 +00:00
Guido van Rossum 0c08864fbb Replace rare tabs with 4 spaces, assuming that's what was intended. 2002-07-11 01:04:32 +00:00
Tim Peters 8acdf7a935 Noted the releases in which COUNT_ALLOCS can blow up. 2002-07-11 00:38:05 +00:00
Tim Peters 62fc52e6a1 Recorded the introduction release for each gimmick, as best I was able to
reconstruct that info.
Filled out some sketchy explanations of pragmatics.
2002-07-11 00:23:58 +00:00
Tim Peters 20c8a04a08 Some clarifications. 2002-07-11 00:02:52 +00:00
Tim Peters 889f61dcfb Documented PYMALLOC_DEBUG. This completes primary coverage of all the
"special builds" I ever use.  If you use others, document them here, or
don't be surprised if I rip out the code for them <0.5 wink>.
2002-07-10 19:29:49 +00:00
Tim Peters a788f5ef02 Clarified sys.getobjects() pragmatics. 2002-07-10 18:47:03 +00:00
Tim Peters 44c1a7bc51 Typo repair. 2002-07-09 19:27:20 +00:00
Tim Peters 48ba649ae3 Moved COUNT_ALLOCS down and finished writing its description. 2002-07-09 19:24:54 +00:00
Tim Peters 3486f617a1 Checkin comment. 2002-07-09 18:48:32 +00:00
Tim Peters 6045d48e5c New file to try to document the "special build" preprocessor symbols.
Incomplete.  Add to it!  Once it settles down, it would make a nice
appendix in the real docs.
2002-07-09 18:35:34 +00:00