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authorAlexandre Vassalotti <alexandre@peadrop.com>2013-11-28 22:56:09 (GMT)
committerAlexandre Vassalotti <alexandre@peadrop.com>2013-11-28 22:56:09 (GMT)
commitb13e6bcbd851c61af22c44dbe6f156653f54baae (patch)
tree62351f7cb4505e03b848b9d6abd4f0d2112b6407 /Modules
parentb6e66ebdf76c56b4a893c0687f91d1e6dd9cac2d (diff)
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Remove the tuple reuse optimization in _Pickle_FastCall.
I have noticed a race-condition occurring on one of the buildbots because of this optimization. The function called may release the GIL which means multiple threads may end up accessing the shared tuple. I could fix it up by storing the tuple to the Pickler and Unipickler object again, but honestly it really not worth the trouble. I ran many benchmarks and the only time the optimization helps is when using a fin-memory file, like io.BytesIO on which reads are super cheap, combined with pickle protocol less than 4. Even in this contrived case, the speedup is a about 5%. For everything else, this optimization does not provide any noticable improvements.
Diffstat (limited to 'Modules')
-rw-r--r--Modules/_pickle.c45
1 files changed, 15 insertions, 30 deletions
diff --git a/Modules/_pickle.c b/Modules/_pickle.c
index a69a9aa..bb10118 100644
--- a/Modules/_pickle.c
+++ b/Modules/_pickle.c
@@ -169,8 +169,6 @@ typedef struct {
/* As the name says, an empty tuple. */
PyObject *empty_tuple;
- /* Single argument tuple used by _Pickle_FastCall */
- PyObject *arg_tuple;
} PickleState;
/* Forward declaration of the _pickle module definition. */
@@ -208,7 +206,6 @@ _Pickle_ClearState(PickleState *st)
Py_CLEAR(st->import_mapping_3to2);
Py_CLEAR(st->codecs_encode);
Py_CLEAR(st->empty_tuple);
- Py_CLEAR(st->arg_tuple);
}
/* Initialize the given pickle module state. */
@@ -328,8 +325,6 @@ _Pickle_InitState(PickleState *st)
if (st->empty_tuple == NULL)
goto error;
- st->arg_tuple = NULL;
-
return 0;
error:
@@ -342,40 +337,31 @@ _Pickle_InitState(PickleState *st)
/* Helper for calling a function with a single argument quickly.
- This has the performance advantage of reusing the argument tuple. This
- provides a nice performance boost with older pickle protocols where many
- unbuffered reads occurs.
-
This function steals the reference of the given argument. */
static PyObject *
_Pickle_FastCall(PyObject *func, PyObject *obj)
{
- PickleState *st = _Pickle_GetGlobalState();
- PyObject *arg_tuple;
PyObject *result;
+ PyObject *arg_tuple = PyTuple_New(1);
+
+ /* Note: this function used to reuse the argument tuple. This used to give
+ a slight performance boost with older pickle implementations where many
+ unbuffered reads occurred (thus needing many function calls).
+
+ However, this optimization was removed because it was too complicated
+ to get right. It abused the C API for tuples to mutate them which led
+ to subtle reference counting and concurrency bugs. Furthermore, the
+ introduction of protocol 4 and the prefetching optimization via peek()
+ significantly reduced the number of function calls we do. Thus, the
+ benefits became marginal at best. */
- arg_tuple = st->arg_tuple;
if (arg_tuple == NULL) {
- arg_tuple = PyTuple_New(1);
- if (arg_tuple == NULL) {
- Py_DECREF(obj);
- return NULL;
- }
+ Py_DECREF(obj);
+ return NULL;
}
- assert(arg_tuple->ob_refcnt == 1);
- assert(PyTuple_GET_ITEM(arg_tuple, 0) == NULL);
-
PyTuple_SET_ITEM(arg_tuple, 0, obj);
result = PyObject_Call(func, arg_tuple, NULL);
-
- Py_CLEAR(PyTuple_GET_ITEM(arg_tuple, 0));
- if (arg_tuple->ob_refcnt > 1) {
- /* The function called saved a reference to our argument tuple.
- This means we cannot reuse it anymore. */
- Py_CLEAR(arg_tuple);
- }
- st->arg_tuple = arg_tuple;
-
+ Py_CLEAR(arg_tuple);
return result;
}
@@ -7427,7 +7413,6 @@ pickle_traverse(PyObject *m, visitproc visit, void *arg)
Py_VISIT(st->import_mapping_3to2);
Py_VISIT(st->codecs_encode);
Py_VISIT(st->empty_tuple);
- Py_VISIT(st->arg_tuple);
return 0;
}
4_win_speedup'>core_8_4_win_speedup Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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