New submission from kbengine:
I have an application, the use of Python3.2.3 development.
When I upgrade to Python3.4.2, found a problem.
I have an extended xxx.c (c-python) module, I call pickle to serialize and
deserialize, _pickle.c calls the whichmodule to look for this module, The final
will be to find the module from sys.modules.
But probably there are 200 elements in sys.modules, Use the obj = getattribute
(module, global_name, allow_qualname) to try to get the object:
static PyObject *
getattribute(PyObject *obj, PyObject *name, int allow_qualname) {
...
...
...
tmp = PyObject_GetAttr(obj, subpath);
Py_DECREF(obj);
// There will be hundreds of times to return to NULL
// There will be hundreds of times calls PyErr_Format
// (PyExc_AttributeError, Can't get attribute%R on%R , name, obj);
// This process will lead to hundreds of calls to moduleobject.c-
// module_repr(PyModuleObject *m).
// So I frequently call pickle.dumps CPU consumption sharply.
if (tmp == NULL) {
if (PyErr_ExceptionMatches(PyExc_AttributeError)) {
PyErr_Clear();
PyErr_Format(PyExc_AttributeError,
Can't get attribute %R on %R, name, obj);
}
Py_DECREF(dotted_path);
return NULL;
}
...
...
}
--
ncalls tottime percall cumtime percall filename:lineno(function)
3150.0010.0000.0040.000 frozen
importlib._bootstrap:690(_module_repr)
I went wrong?
Look forward to answer, thanks!
--
components: Extension Modules
files: 20141020193031.jpg
messages: 229723
nosy: kbengine
priority: normal
severity: normal
status: open
title: _pickle.c
type: performance
versions: Python 3.4
Added file: http://bugs.python.org/file36980/20141020193031.jpg
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