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bpo-31415: Support PYTHONPROFILEIMPORTTIME envvar equivalent to -X importtime (#4240)

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Support PYTHONPROFILEIMPORTTIME envvar equivalent to -X importtime
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Barry Warsaw 2017-11-02 16:13:36 -07:00 committed by GitHub
parent 9e33973332
commit 700d2e4755
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3 changed files with 25 additions and 7 deletions
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14
Doc/using/cmdline.rst
View File

@ -411,7 +411,8 @@ Miscellaneous options
* ``-X importtime`` to show how long each import takes. It shows module name,
cumulative time (including nested imports) and self time (exluding nested
imports). Note that its output may be broken in multi threaded application.
Typical usage is ``python3 -X importtime -c 'import asyncio'``.
Typical usage is ``python3 -X importtime -c 'import asyncio'``. See also
:envvar:`PYTHONPROFILEIMPORTTIME`.
It also allows passing arbitrary values and retrieving them through the
:data:`sys._xoptions` dictionary.
@ -429,7 +430,7 @@ Miscellaneous options
The ``-X showalloccount`` option.
.. versionadded:: 3.7
The ``-X importtime`` option.
The ``-X importtime`` and :envvar:`PYTHONPROFILEIMPORTTIME` options.
Options you shouldn't use
@ -650,6 +651,15 @@ conflict.
.. versionadded:: 3.4
.. envvar:: PYTHONPROFILEIMPORTTIME
If this environment variable is set to a non-empty string, Python will
show how long each import takes. This is exactly equivalent to setting
``-X importtime`` on the command line.
.. versionadded:: 3.7
.. envvar:: PYTHONASYNCIODEBUG
If this environment variable is set to a non-empty string, enable the

3
Misc/NEWS.d/3.7.0a2.rst
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@ -166,7 +166,8 @@ special method lookups. Patch by Stefan Behnel.
.. section: Core and Builtins
Add ``-X importtime`` option to show how long each import takes. It can be
used to optimize application's startup time.
used to optimize application's startup time. Support the
:envvar:`PYTHONPROFILEIMPORTTIME` as an equivalent way to enable this.
..

15
Python/import.c
View File

@ -1682,10 +1682,17 @@ PyImport_ImportModuleLevelObject(PyObject *name, PyObject *globals,
* _PyDict_GetItemId()
*/
if (ximporttime == 0) {
PyObject *xoptions = PySys_GetXOptions();
if (xoptions) {
PyObject *value = _PyDict_GetItemId(xoptions, &PyId_importtime);
ximporttime = (value == Py_True);
char *envoption = Py_GETENV("PYTHONPROFILEIMPORTTIME");
if (envoption != NULL && strlen(envoption) > 0) {
ximporttime = 1;
}
else {
PyObject *xoptions = PySys_GetXOptions();
if (xoptions) {
PyObject *value = _PyDict_GetItemId(
xoptions, &PyId_importtime);
ximporttime = (value == Py_True);
}
}
if (ximporttime) {
fputs("import time: self [us] | cumulative | imported package\n",