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Diffstat (limited to 'Doc/using/cmdline.rst')
| -rw-r--r-- | Doc/using/cmdline.rst | 90 |
1 files changed, 84 insertions, 6 deletions
diff --git a/Doc/using/cmdline.rst b/Doc/using/cmdline.rst index 57faf89..75cb8ea 100644 --- a/Doc/using/cmdline.rst +++ b/Doc/using/cmdline.rst @@ -395,6 +395,8 @@ Miscellaneous options stored in a traceback of a trace. Use ``-X tracemalloc=NFRAME`` to start tracing with a traceback limit of *NFRAME* frames. See the :func:`tracemalloc.start` for more information. + * ``-X showalloccount`` to enable the output of the total count of allocated + objects for each type (only works when built with ``COUNT_ALLOCS`` defined); It also allows passing arbitrary values and retrieving them through the :data:`sys._xoptions` dictionary. @@ -408,6 +410,9 @@ Miscellaneous options .. versionadded:: 3.4 The ``-X showrefcount`` and ``-X tracemalloc`` options. + .. versionadded:: 3.6 + The ``-X showalloccount`` option. + Options you shouldn't use ~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -554,6 +559,10 @@ conflict. .. versionchanged:: 3.4 The ``encodingname`` part is now optional. + .. versionchanged:: 3.6 + On Windows, the encoding specified by this variable is ignored for interactive + console buffers unless :envvar:`PYTHONLEGACYWINDOWSIOENCODING` is also specified. + Files and pipes redirected through the standard streams are not affected. .. envvar:: PYTHONNOUSERSITE @@ -619,6 +628,81 @@ conflict. .. versionadded:: 3.4 +.. envvar:: PYTHONMALLOC + + Set the Python memory allocators and/or install debug hooks. + + Set the family of memory allocators used by Python: + + * ``malloc``: use the :c:func:`malloc` function of the C library + for all domains (:c:data:`PYMEM_DOMAIN_RAW`, :c:data:`PYMEM_DOMAIN_MEM`, + :c:data:`PYMEM_DOMAIN_OBJ`). + * ``pymalloc``: use the :ref:`pymalloc allocator <pymalloc>` for + :c:data:`PYMEM_DOMAIN_MEM` and :c:data:`PYMEM_DOMAIN_OBJ` domains and use + the :c:func:`malloc` function for the :c:data:`PYMEM_DOMAIN_RAW` domain. + + Install debug hooks: + + * ``debug``: install debug hooks on top of the default memory allocator + * ``malloc_debug``: same as ``malloc`` but also install debug hooks + * ``pymalloc_debug``: same as ``pymalloc`` but also install debug hooks + + When Python is compiled in release mode, the default is ``pymalloc``. When + compiled in debug mode, the default is ``pymalloc_debug`` and the debug hooks + are used automatically. + + If Python is configured without ``pymalloc`` support, ``pymalloc`` and + ``pymalloc_debug`` are not available, the default is ``malloc`` in release + mode and ``malloc_debug`` in debug mode. + + See the :c:func:`PyMem_SetupDebugHooks` function for debug hooks on Python + memory allocators. + + .. versionadded:: 3.6 + + +.. envvar:: PYTHONMALLOCSTATS + + If set to a non-empty string, Python will print statistics of the + :ref:`pymalloc memory allocator <pymalloc>` every time a new pymalloc object + arena is created, and on shutdown. + + This variable is ignored if the :envvar:`PYTHONMALLOC` environment variable + is used to force the :c:func:`malloc` allocator of the C library, or if + Python is configured without ``pymalloc`` support. + + .. versionchanged:: 3.6 + This variable can now also be used on Python compiled in release mode. + It now has no effect if set to an empty string. + + +.. envvar:: PYTHONLEGACYWINDOWSFSENCODING + + If set to a non-empty string, the default filesystem encoding and errors mode + will revert to their pre-3.6 values of 'mbcs' and 'replace', respectively. + Otherwise, the new defaults 'utf-8' and 'surrogatepass' are used. + + This may also be enabled at runtime with + :func:`sys._enablelegacywindowsfsencoding()`. + + Availability: Windows + + .. versionadded:: 3.6 + See :pep:`529` for more details. + +.. envvar:: PYTHONLEGACYWINDOWSIOENCODING + + If set to a non-empty string, does not use the new console reader and + writer. This means that Unicode characters will be encoded according to + the active console code page, rather than using utf-8. + + This variable is ignored if the standard streams are redirected (to files + or pipes) rather than referring to console buffers. + + Availability: Windows + + .. versionadded:: 3.6 + Debug-mode variables ~~~~~~~~~~~~~~~~~~~~ @@ -634,9 +718,3 @@ if Python was configured with the ``--with-pydebug`` build option. If set, Python will dump objects and reference counts still alive after shutting down the interpreter. - - -.. envvar:: PYTHONMALLOCSTATS - - If set, Python will print memory allocation statistics every time a new - object arena is created, and on shutdown. |