Construct GeneratorUsage

Kay Hayen

2013-08-15 08:15

Performance Diagrams

Source Code with Construct

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    def generator():
        yield 1
        yield 2
        yield 3

    gen = generator()

    x = next(gen)
# construct_begin
    next(gen)
# construct_end

    return x

import itertools
for x in itertools.repeat(None, 50000):
    calledRepeatedly()

print("OK.")

Source Code without Construct

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    def generator():
        yield 1
        yield 2
        yield 3

    gen = generator()

    x = next(gen)
# construct_begin



    return x

import itertools
for x in itertools.repeat(None, 50000):
    calledRepeatedly()

print("OK.")

Context Diff of Source Code

	Construct			Baseline
	29			29
	30	gen = generator()		30	gen = generator()
	31			31
	32	x = next(gen)		32	x = next(gen)
	33	# construct_begin		33	# construct_begin
t	34	next(gen)	t	34
	35	# construct_end		35
	36			36
	37	return x		37	return x
	38			38
	39	import itertools		39	import itertools
	40	for x in itertools.repeat(None, 50000):		40	for x in itertools.repeat(None, 50000):

Context Diff of Generated Code

	Construct			Baseline
	116	NUITKA_MAY_BE_UNUSED char const *type_description_1 = NULL;		116	NUITKA_MAY_BE_UNUSED char const *type_description_1 = NULL;
	117	PyObject *exception_type = NULL;		117	PyObject *exception_type = NULL;
	118	PyObject *exception_value = NULL;		118	PyObject *exception_value = NULL;
	119	PyTracebackObject *exception_tb = NULL;		119	PyTracebackObject *exception_tb = NULL;
	120	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;		120	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;
n	121	NUITKA_MAY_BE_UNUSED nuitka_void tmp_unused;	n
	122	static struct Nuitka_FrameObject *cache_frame_4488cc635023f69d6abf25f98defaa20 = NULL;		121	static struct Nuitka_FrameObject *cache_frame_4488cc635023f69d6abf25f98defaa20 = NULL;
	123	PyObject *tmp_return_value = NULL;		122	PyObject *tmp_return_value = NULL;
	124	PyObject *exception_keeper_type_1;		123	PyObject *exception_keeper_type_1;
	125	PyObject *exception_keeper_value_1;		124	PyObject *exception_keeper_value_1;
	126	PyTracebackObject *exception_keeper_tb_1;		125	PyTracebackObject *exception_keeper_tb_1;
	205	exception_lineno = 32;		204	exception_lineno = 32;
	206	goto frame_exception_exit_1;		205	goto frame_exception_exit_1;
	207	}		206	}
	208	assert(var_x == NULL);		207	assert(var_x == NULL);
	209	var_x = tmp_assign_source_3;		208	var_x = tmp_assign_source_3;
n	210	}	n
	211	{
	212	PyObject *tmp_value_name_2;
	213	PyObject *tmp_next_value_1;
	214	CHECK_OBJECT(var_gen);
	215	tmp_value_name_2 = var_gen;
	216	tmp_next_value_1 = ITERATOR_NEXT(tmp_value_name_2);
	217	if (tmp_next_value_1 == NULL) {
	218	if (!ERROR_OCCURRED()) {
	219	exception_type = PyExc_StopIteration;
	220	Py_INCREF(exception_type);
	221	exception_value = NULL;
	222	exception_tb = NULL;
	223	} else {
	224	FETCH_ERROR_OCCURRED(&exception_type, &exception_value, &exception_tb);
	225	}
	226
	227
	228	type_description_1 = "ooo";
	229	exception_lineno = 34;
	230	goto frame_exception_exit_1;
	231	}
	232	Py_DECREF(tmp_next_value_1);
	233	}		209	}
	234			210
	235	#if 0		211	#if 0
	236	RESTORE_FRAME_EXCEPTION(frame_4488cc635023f69d6abf25f98defaa20);		212	RESTORE_FRAME_EXCEPTION(frame_4488cc635023f69d6abf25f98defaa20);
	237	#endif		213	#endif
	315	CHECK_OBJECT(var_generator);		291	CHECK_OBJECT(var_generator);
	316	Py_DECREF(var_generator);		292	Py_DECREF(var_generator);
	317	var_generator = NULL;		293	var_generator = NULL;
	318	Py_XDECREF(var_gen);		294	Py_XDECREF(var_gen);
	319	var_gen = NULL;		295	var_gen = NULL;
t	320	Py_XDECREF(var_x);	t
	321	var_x = NULL;
	322	// Re-raise.		296	// Re-raise.
	323	exception_type = exception_keeper_type_1;		297	exception_type = exception_keeper_type_1;
	324	exception_value = exception_keeper_value_1;		298	exception_value = exception_keeper_value_1;
	325	exception_tb = exception_keeper_tb_1;		299	exception_tb = exception_keeper_tb_1;
	326	exception_lineno = exception_keeper_lineno_1;		300	exception_lineno = exception_keeper_lineno_1;