The list() constructor isn't taking full advantage of known input
lengths or length hints. This commit makes the constructor
pre-size and not over-allocate when the input size is known (the
input collection implements __len__). One on the main advantages is
that this provides 12% difference in memory savings due to the difference
between overallocating and allocating exactly the input size.
For efficiency purposes and to avoid a performance regression for small
generators and collections, the size of the input object is calculated using
__len__ and not __length_hint__, as the later is considerably slower.
METH_NOARGS functions need only a single argument but they are cast
into a PyCFunction, which takes two arguments. This triggers an
invalid function cast warning in gcc8 due to the argument mismatch.
Fix this by adding a dummy unused argument.
Py_Main() now handles two more -X options:
* -X showrefcount: new _PyCoreConfig.show_ref_count field
* -X showalloccount: new _PyCoreConfig.show_alloc_count field
* group the (stateful) runtime globals into various topical structs
* consolidate the topical structs under a single top-level _PyRuntimeState struct
* add a check-c-globals.py script that helps identify runtime globals
Other globals are excluded (see globals.txt and check-c-globals.py).
Issue #28858: The change b9c9691c72c5 introduced a regression. It seems like
_PyObject_CallArg1() uses more stack memory than
PyObject_CallFunctionObjArgs().
* PyObject_CallFunctionObjArgs(func, NULL) => _PyObject_CallNoArg(func)
* PyObject_CallFunctionObjArgs(func, arg, NULL) => _PyObject_CallArg1(func, arg)
PyObject_CallFunctionObjArgs() allocates 40 bytes on the C stack and requires
extra work to "parse" C arguments to build a C array of PyObject*.
_PyObject_CallNoArg() and _PyObject_CallArg1() are simpler and don't allocate
memory on the C stack.
This change is part of the fastcall project. The change on listsort() is
related to the issue #23507.
SHOW_ALLOC_COUNT or SHOW_TRACK_COUNT macros is now off by default. It can
be re-enabled using the "-X showalloccount" option. It now outputs to stderr
instead of stdout.
See
de Gouw, Stijn and Rot, Jurriaan and de Boer, Frank S and Bubel, Richard and Hähnle, Reiner
"OpenJDK’s java.utils.Collection.sort() is broken: The good, the bad and the worst case"
svn+ssh://pythondev@svn.python.org/python/branches/py3k
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r78541 | ezio.melotti | 2010-03-01 06:08:34 +0200 (Mon, 01 Mar 2010) | 17 lines
Merged revisions 78515-78516,78522 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r78515 | georg.brandl | 2010-02-28 20:19:17 +0200 (Sun, 28 Feb 2010) | 1 line
#8030: make builtin type docstrings more consistent: use "iterable" instead of "seq(uence)", use "new" to show that set() always returns a new object.
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r78516 | georg.brandl | 2010-02-28 20:26:37 +0200 (Sun, 28 Feb 2010) | 1 line
The set types can also be called without arguments.
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r78522 | ezio.melotti | 2010-03-01 01:59:00 +0200 (Mon, 01 Mar 2010) | 1 line
#8030: more docstring fix for builtin types.
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svn+ssh://pythondev@svn.python.org/python/trunk
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r78515 | georg.brandl | 2010-02-28 20:19:17 +0200 (Sun, 28 Feb 2010) | 1 line
#8030: make builtin type docstrings more consistent: use "iterable" instead of "seq(uence)", use "new" to show that set() always returns a new object.
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r78516 | georg.brandl | 2010-02-28 20:26:37 +0200 (Sun, 28 Feb 2010) | 1 line
The set types can also be called without arguments.
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r78522 | ezio.melotti | 2010-03-01 01:59:00 +0200 (Mon, 01 Mar 2010) | 1 line
#8030: more docstring fix for builtin types.
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svn+ssh://pythondev@svn.python.org/python/branches/py3k
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r78185 | mark.dickinson | 2010-02-14 12:53:32 +0000 (Sun, 14 Feb 2010) | 13 lines
Merged revisions 78183-78184 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r78183 | mark.dickinson | 2010-02-14 12:16:43 +0000 (Sun, 14 Feb 2010) | 1 line
Silence some 'comparison between signed and unsigned' compiler warnings.
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r78184 | mark.dickinson | 2010-02-14 12:31:26 +0000 (Sun, 14 Feb 2010) | 1 line
Silence more compiler warnings; fix an instance of potential undefined behaviour from signed overflow.
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svn+ssh://pythondev@svn.python.org/python/trunk
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r78183 | mark.dickinson | 2010-02-14 12:16:43 +0000 (Sun, 14 Feb 2010) | 1 line
Silence some 'comparison between signed and unsigned' compiler warnings.
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r78184 | mark.dickinson | 2010-02-14 12:31:26 +0000 (Sun, 14 Feb 2010) | 1 line
Silence more compiler warnings; fix an instance of potential undefined behaviour from signed overflow.
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svn+ssh://pythondev@svn.python.org/python/branches/py3k
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r77823 | mark.dickinson | 2010-01-29 17:27:24 +0000 (Fri, 29 Jan 2010) | 10 lines
Merged revisions 77821 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r77821 | mark.dickinson | 2010-01-29 17:11:39 +0000 (Fri, 29 Jan 2010) | 3 lines
Issue #7788: Fix a crash produced by deleting a list slice with huge
step value. Patch by Marcin Bachry.
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Victor Stinner