bm-20250416-azure-x86_64-faster%2dcpython-get_iter_stats-3.14.0a7+-10cd875-pystats-async_tree_memoization-vs-base.md

Execution counts

Execution counts for Tier 1 instructions.

The "miss ratio" column shows the percentage of times the instruction executed that it deoptimized. When this happens, the base unspecialized instruction is not counted.

Name	Base Count	Head Count	Change
LOAD_FAST_BORROW	375,917,700	375,917,700	0.0%
POP_JUMP_IF_FALSE	116,265,960	116,265,960	0.0%
RETURN_VALUE	98,107,940	98,107,940	0.0%
RESUME_CHECK	91,941,340	91,941,340	0.0%
LOAD_CONST_IMMORTAL	91,151,700	91,151,700	0.0%
STORE_FAST	89,764,740	89,764,740	0.0%
LOAD_FAST_BORROW_LOAD_FAST_BORROW	88,343,800	88,343,800	0.0%
TO_BOOL_BOOL	77,425,120	77,425,120	0.0%
LOAD_ATTR_METHOD_WITH_VALUES	72,128,640	72,128,640	0.0%
LOAD_ATTR_SLOT	66,711,000	66,711,000	0.0%
LOAD_ATTR_INSTANCE_VALUE	62,376,560	62,376,560	0.0%
POP_TOP	58,160,940	58,160,940	0.0%
STORE_ATTR_SLOT	56,809,180	56,809,180	0.0%
CALL_PY_EXACT_ARGS	52,297,380	52,297,380	0.0%
LOAD_GLOBAL_MODULE	51,406,720	51,406,720	0.0%
PUSH_NULL	47,252,280	47,252,280	0.0%
LOAD_ATTR_METHOD_NO_DICT	35,810,580	35,810,580	0.0%
LOAD_DEREF	30,785,000	30,785,000	0.0%
LOAD_ATTR_MODULE	30,196,180	30,196,180	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	27,766,780	27,766,780	0.0%
INTERPRETER_EXIT	23,714,760	23,714,760	0.0%
LOAD_SMALL_INT	23,511,620	23,511,620	0.0%
TO_BOOL_NONE	19,295,420	19,295,420	0.0%
POP_JUMP_IF_NOT_NONE	19,021,480	19,021,480	0.0%
JUMP_BACKWARD_NO_JIT	18,974,180	18,974,180	0.0%
POP_JUMP_IF_NONE	17,356,320	17,356,320	0.0%
COMPARE_OP_INT	15,908,900	15,908,900	0.0%
NOP	14,828,400	14,828,400	0.0%
BINARY_OP_ADD_INT	12,317,100	12,317,100	0.0%
LOAD_ATTR	12,308,320	12,308,320	0.0%
CALL_NON_PY_GENERAL	12,304,180	12,304,180	0.0%
CALL_FUNCTION_EX	12,025,320	12,025,320	0.0%
FOR_ITER_RANGE	11,750,540	11,750,540	0.0%
LOAD_GLOBAL_BUILTIN	11,696,820	11,696,820	0.0%
CALL_METHOD_DESCRIPTOR_O	11,487,940	11,487,940	0.0%
CALL_BUILTIN_FAST	10,353,640	10,353,640	0.0%
BUILD_LIST	10,346,940	10,346,940	0.0%
STORE_DEREF	9,517,680	9,517,680	0.0%
CALL_INTRINSIC_1	8,106,060	8,106,060	0.0%
LIST_EXTEND	8,106,060	8,106,060	0.0%
POP_JUMP_IF_TRUE	7,834,940	7,834,940	0.0%
EXIT_INIT_CHECK	7,830,320	7,830,320	0.0%
CALL_ALLOC_AND_ENTER_INIT	7,830,320	7,830,320	0.0%
CALL_LIST_APPEND	6,718,320	6,718,320	0.0%
RETURN_GENERATOR	6,710,540	6,710,540	0.0%
BINARY_OP_SUBTRACT_INT	6,158,580	6,158,580	0.0%
CALL_BUILTIN_O	6,150,680	6,150,680	0.0%
LOAD_CONST_MORTAL	5,315,200	5,315,200	0.0%
FOR_ITER_LIST	4,481,700	4,481,700	0.0%
BUILD_TUPLE	4,479,540	4,479,540	0.0%
COPY_FREE_VARS	4,471,520	4,471,520	0.0%
BUILD_MAP	4,195,300	4,195,300	0.0%
END_SEND	4,187,100	4,187,100	0.0%
GET_AWAITABLE	4,187,100	4,187,100	0.0%
SEND_GEN	4,179,200	4,179,200	0.0%
JUMP_FORWARD	3,922,260	3,922,260	0.0%
FOR_ITER_TUPLE	3,919,020	3,919,020	0.0%
CALL_PY_GENERAL	3,911,540	3,911,540	0.0%
COMPARE_OP_FLOAT	3,575,240	3,575,240	0.0%
STORE_ATTR	3,361,100	3,361,100	0.0%
COPY	3,361,080	3,361,080	0.0%
IS_OP	3,359,520	3,359,520	0.0%
DICT_MERGE	3,359,280	3,359,280	0.0%
DELETE_FAST	3,359,220	3,359,220	0.0%
CALL_KW_PY	3,359,220	3,359,220	0.0%
CALL_TYPE_1	3,359,220	3,359,220	0.0%
CONTAINS_OP_DICT	3,359,220	3,359,220	0.0%
CONTAINS_OP_SET	3,359,220	3,359,220	0.0%
STORE_SUBSCR_DICT	3,359,220	3,359,220	0.0%
LIST_APPEND	3,359,160	3,359,160	0.0%
CALL_ISINSTANCE	3,299,560	3,299,560	0.0%
GET_ITER	2,803,620	2,803,620	0.0%
MAKE_CELL	2,799,420	2,799,420	0.0%
CALL_BOUND_METHOD_EXACT_ARGS	2,799,420	2,799,420	0.0%
CALL_METHOD_DESCRIPTOR_FAST	2,523,620	2,523,620	0.0%
POP_ITER	2,243,820	2,243,820	0.0%
SWAP	1,679,820	1,679,820	0.0%
SEND	1,671,980	1,671,980	0.0%
JUMP_BACKWARD_NO_INTERRUPT	1,663,660	1,663,660	0.0%
YIELD_VALUE	1,663,660	1,663,660	0.0%
CALL_KW_NON_PY	1,395,700	1,395,700	0.0%
STORE_ATTR_INSTANCE_VALUE	1,122,660	1,122,660	0.0%
SET_FUNCTION_ATTRIBUTE	1,119,960	1,119,960	0.0%
LOAD_SUPER_ATTR_METHOD	1,112,180	1,112,180	0.0%
TO_BOOL	562,080	562,080	0.0%
CALL_BUILTIN_CLASS	561,780	561,780	0.0%
MAKE_FUNCTION	560,100	560,100	0.0%
CALL_BUILTIN_FAST_WITH_KEYWORDS	559,980	559,980	0.0%
LOAD_FAST_AND_CLEAR	559,860	559,860	0.0%
TO_BOOL_LIST	278,680	278,680	0.0%
BINARY_OP_ADD_FLOAT	277,300	277,300	0.0%
COMPARE_OP	276,140	276,140	0.0%
BINARY_OP_SUBSCR_LIST_INT	276,100	276,100	0.0%
LOAD_FAST	4,860	4,860	0.0%
CALL_LEN	4,140	4,140	0.0%
CALL	2,400	2,400	0.0%
TO_BOOL_INT	1,740	1,740	0.0%
CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	1,560	1,560	0.0%
LOAD_GLOBAL	1,320	1,320	0.0%
BINARY_OP	360	360	0.0%
BINARY_OP_EXTEND	360	360	0.0%
FOR_ITER	240	240	0.0%
LOAD_ATTR_CLASS	240	240	0.0%
UNPACK_SEQUENCE_TWO_TUPLE	240	240	0.0%
STORE_FAST_STORE_FAST	180	180	0.0%
LOAD_SUPER_ATTR	160	160	0.0%
CHECK_EXC_MATCH	120	120	0.0%
POP_EXCEPT	120	120	0.0%
PUSH_EXC_INFO	120	120	0.0%
UNARY_INVERT	120	120	0.0%
UNARY_NOT	120	120	0.0%
BINARY_OP_SUBSCR_DICT	120	120	0.0%
UNPACK_SEQUENCE	80	80	0.0%
IMPORT_NAME	60	60	0.0%
LOAD_FAST_LOAD_FAST	60	60	0.0%
RAISE_VARARGS	60	60	0.0%
RERAISE	60	60	0.0%
BINARY_OP_SUBSCR_GETITEM	60	60	0.0%
BINARY_OP_SUBSCR_TUPLE_INT	60	60	0.0%
BINARY_OP_SUBTRACT_FLOAT	60	60	0.0%
CALL_BOUND_METHOD_GENERAL	60	60	0.0%
LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES	60	60	0.0%
CALL_KW	40	40	0.0%
STORE_SUBSCR	20	20	0.0%
CONTAINS_OP	20	20	0.0%

Pair counts

Pair counts for top 100 opcode pairs

Pairs of specialized operations that deoptimize and are then followed by the corresponding unspecialized instruction are not counted as pairs.

Not included in comparative output.

Predecessor/Successor Pairs

Top 5 predecessors and successors of each Tier 1 opcode.

This does not include the unspecialized instructions that occur after a specialized instruction deoptimizes.

Not included in comparative output.

Specialization stats

Specialization stats by family

BINARY_OP

specialization stats for BINARY_OP family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	120	0.0%	120	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	19,305,840	100.0%	19,305,840	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	220	91.7%	220	91.7%	0.0%
Failure	20	8.3%	20	8.3%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
true divide other	20	100.0%	20	100.0%	0.0%

CALL

specialization stats for CALL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	6,948,140	5.0%	6,948,140	5.0%	0.0%
hit ⓘ Specialized instructions that complete.	131,432,020	94.9%	131,432,020	94.9%	0.0%
miss ⓘ Specialized instructions that deopt.	7,081,740	5.1%	7,081,740	5.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	136,000	100.0%	136,000	100.0%	0.0%
Failure	0	0.0%	0	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
init not python	20	20 / 0 !!	20	20 / 0 !!	0.0%

CALL_KW

specialization stats for CALL_KW family

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	40	100.0%	40	100.0%	0.0%
Failure	0	0.0%	0	0.0%

COMPARE_OP

specialization stats for COMPARE_OP family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	276,040	1.4%	276,040	1.4%	0.0%
hit ⓘ Specialized instructions that complete.	19,484,140	98.6%	19,484,140	98.6%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	20.0%	20	20.0%	0.0%
Failure	80	80.0%	80	80.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
float long	60	75.0%	60	75.0%	0.0%
bool	20	25.0%	20	25.0%	0.0%

CONTAINS_OP

specialization stats for CONTAINS_OP family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	6,718,440	100.0%	6,718,440	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	100.0%	20	100.0%	0.0%
Failure	0	0.0%	0	0.0%

FOR_ITER

specialization stats for FOR_ITER family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	180	0.0%	180	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	20,151,260	100.0%	20,151,260	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	33.3%	20	33.3%	0.0%
Failure	40	66.7%	40	66.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
dict items	40	100.0%	40	100.0%	0.0%

LOAD_ATTR

specialization stats for LOAD_ATTR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	12,302,260	4.4%	12,302,260	4.4%	0.0%
hit ⓘ Specialized instructions that complete.	266,661,320	95.4%	266,661,320	95.4%	0.0%
miss ⓘ Specialized instructions that deopt.	561,940	0.2%	561,940	0.2%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	13,260	79.7%	13,260	79.7%	0.0%
Failure	3,380	20.3%	3,380	20.3%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
method	2,100	62.1%	2,100	62.1%	0.0%
overriding descriptor	940	27.8%	940	27.8%	0.0%
module attr not found	260	7.7%	260	7.7%	0.0%
metaclass attribute	20	0.6%	20	0.6%	0.0%

LOAD_GLOBAL

specialization stats for LOAD_GLOBAL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deopt ⓘ Specialized instructions that deopt.	60	0.0%	60	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	63,103,480	100.0%	63,103,480	100.0%	0.0%
miss ⓘ Specialized instructions that deopt.	60	0.0%	60	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	1,320	100.0%	1,320	100.0%	0.0%
Failure	0	0.0%	0	0.0%

LOAD_SUPER_ATTR

specialization stats for LOAD_SUPER_ATTR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	1,112,180	100.0%	1,112,180	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	160	100.0%	160	100.0%	0.0%
Failure	0	0.0%	0	0.0%

SEND

specialization stats for SEND family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	1,671,560	28.6%	1,671,560	28.6%	0.0%
hit ⓘ Specialized instructions that complete.	4,179,200	71.4%	4,179,200	71.4%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	0	0.0%	0	0.0%
Failure	420	100.0%	420	100.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
other	420	100.0%	420	100.0%	0.0%

STORE_ATTR

specialization stats for STORE_ATTR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	3,359,340	5.5%	3,359,340	5.5%	0.0%
hit ⓘ Specialized instructions that complete.	54,444,120	88.8%	54,444,120	88.8%	0.0%
miss ⓘ Specialized instructions that deopt.	3,487,720	5.7%	3,487,720	5.7%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	66,700	98.7%	66,700	98.7%	0.0%
Failure	860	1.3%	860	1.3%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
overriding descriptor	840	97.7%	840	97.7%	0.0%

STORE_SUBSCR

specialization stats for STORE_SUBSCR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	3,359,220	100.0%	3,359,220	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	100.0%	20	100.0%	0.0%
Failure	0	0.0%	0	0.0%

TO_BOOL

specialization stats for TO_BOOL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	561,300	0.6%	561,300	0.6%	0.0%
hit ⓘ Specialized instructions that complete.	97,000,960	99.4%	97,000,960	99.4%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	580	74.4%	580	74.4%	0.0%
Failure	200	25.6%	200	25.6%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
tuple	140	70.0%	140	70.0%	0.0%
sequence	60	30.0%	60	30.0%	0.0%

UNPACK_SEQUENCE

specialization stats for UNPACK_SEQUENCE family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	240	75.0%	240	75.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	80	100.0%	80	100.0%	0.0%
Failure	0	0.0%	0	0.0%

Specialization effectiveness

specialization effectiveness

All entries are execution counts. Should add up to the total number of Tier 1 instructions executed.

Instructions	Base Count	Base Ratio	Head Count	Head Ratio	Change
Not specialized ⓘ Instructions that could be specialized but aren't, e.g. LOAD_ATTR, BINARY_SLICE.	18,184,260	0.9%	20,987,880	1.0%	15.4%
Basic ⓘ Instructions that are not and cannot be specialized, e.g. LOAD_FAST.	1,130,849,680	54.6%	1,128,046,060	54.4%	-0.2%
Specialized misses ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that deopt.	11,143,037	0.5%	11,143,041	0.5%	0.0%
Specialized hits ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that complete.	912,218,443	44.0%	912,218,439	44.0%	-0.0%

Deferred by instruction

Breakdown of deferred (not specialized) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
LOAD_ATTR	12,302,260	49.0%	12,302,260	49.0%	0.0%
CALL	6,948,140	27.7%	6,948,140	27.7%	0.0%
STORE_ATTR	3,359,340	13.4%	3,359,340	13.4%	0.0%
SEND	1,671,560	6.7%	1,671,560	6.7%	0.0%
TO_BOOL	561,300	2.2%	561,300	2.2%	0.0%
COMPARE_OP	276,040	1.1%	276,040	1.1%	0.0%
FOR_ITER	180	0.0%	180	0.0%	0.0%
BINARY_OP	120	0.0%	120	0.0%	0.0%
BINARY_SLICE	0	0.0%	0	0.0%
STORE_SLICE	0	0.0%	0	0.0%

Misses by instruction

Breakdown of misses (specialized deopts) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
RESUME	11,577	0.1%	11,581	0.1%	0.0%
RESUME_CHECK	11,577	0.1%	11,581	0.1%	0.0%
CALL_METHOD_DESCRIPTOR_O	3,657,740	32.8%	3,657,740	32.8%	0.0%
STORE_ATTR_SLOT	3,487,720	31.3%	3,487,720	31.3%	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	3,424,000	30.7%	3,424,000	30.7%	0.0%
LOAD_ATTR_SLOT	549,220	4.9%	549,220	4.9%	0.0%
LOAD_ATTR_METHOD_NO_DICT	12,720	0.1%	12,720	0.1%	0.0%
LOAD_GLOBAL_BUILTIN	60	0.0%	60	0.0%	0.0%
CACHE	0	0.0%	0	0.0%
CALL_FUNCTION_EX	0	0.0%	0	0.0%

Call stats

Inlined calls and frame stats

This shows what fraction of calls to Python functions are inlined (i.e. not having a call at the C level) and for those that are not, where the call comes from. The various categories overlap.

Also includes the count of frame objects created.

	Base Count	Base Ratio	Head Count	Head Ratio	Change
Calls to PyEval_EvalDefault	23,714,820	24.0%	23,714,820	24.0%	0.0%
Calls to Python functions inlined	74,937,060	76.0%	74,937,060	76.0%	0.0%
Calls via PyEval_EvalFrame (total)	23,714,820	24.0%	23,714,820	24.0%	0.0%
Calls via PyEval_EvalFrame (vector)	19,519,820	19.8%	19,519,820	19.8%	0.0%
Calls via PyEval_EvalFrame (generator)	4,195,000	4.3%	4,195,000	4.3%	0.0%
Calls via PyEval_EvalFrame (legacy)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (function vectorcall)	19,519,820	19.8%	19,519,820	19.8%	0.0%
Calls via PyEval_EvalFrame (build class)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (slot)	3,299,140	3.3%	3,299,140	3.3%	0.0%
Calls via PyEval_EvalFrame (function ex)	559,860	0.6%	559,860	0.6%	0.0%
Calls via PyEval_EvalFrame (api)	60	0.0%	60	0.0%	0.0%
Calls via PyEval_EvalFrame (method)	11,749,220	11.9%	11,749,220	11.9%	0.0%
Frame objects created	120	0.0%	120	0.0%	0.0%
Frames pushed	98,108,000	99.4%	98,108,000	99.4%	0.0%

Object stats

Allocations, frees and dict materializatons

Below, "allocations" means "allocations that are not from a freelist". Total allocations = "Allocations from freelist" + "Allocations".

"Inline values" is the number of values arrays inlined into objects.

The cache hit/miss numbers are for the MRO cache, split into dunder and other names.

	Base Count	Base Ratio	Head Count	Head Ratio	Change
Method cache dunder misses	113		116		2.7%
Method cache misses	563,929		563,353		-0.1%
Method cache collisions	563,414		562,918		-0.1%
Allocations to 4 kbytes	46,286	0.0%	46,288	0.0%	0.0%
Method cache hits	40,421,491		40,422,067		0.0%
Immortal decrefs	134,005,327	13.5%	134,004,474	13.5%	-0.0%
Frees	55,734,865		55,735,189		0.0%
Immortal increfs	96,994,627	10.6%	96,994,081	10.6%	-0.0%
Mortal increfs	195,984,914	21.4%	195,984,329	21.4%	-0.0%
Allocations from freelist	61,300,982	53.1%	61,301,049	53.1%	0.0%
Frees to freelist	61,301,042		61,301,109		0.0%
Mortal decrefs	268,217,137	27.1%	268,216,860	27.1%	-0.0%
Method cache dunder hits	3,859,747		3,859,744		-0.0%
Allocations	54,057,962	46.9%	54,057,988	46.9%	0.0%
Allocations to 512 bytes	54,011,676	46.8%	54,011,700	46.8%	0.0%
Interpreter mortal decrefs	573,758,462	57.9%	573,758,531	57.9%	0.0%
Allocations over 4 kbytes	0	0.0%	0	0.0%
Inline values	4,195,360		4,195,360		0.0%
Interpreter mortal increfs	545,774,620	59.5%	545,774,620	59.5%	0.0%
Interpreter immortal increfs	78,465,220	8.6%	78,465,220	8.6%	0.0%
Interpreter immortal decrefs	15,369,220	1.6%	15,369,220	1.6%	0.0%
Materialize dict (on request)	0	0.0%	0	0.0%
Materialize dict (new key)	0	0.0%	0	0.0%
Materialize dict (too big)	0	0.0%	0	0.0%
Materialize dict (str subclass)	0	0.0%	0	0.0%

GC stats

GC collections and effectiveness

Collected/visits gives some measure of efficiency.

Generation	Base Collections	Base Objects collected	Base Object visits	Base Reachable from roots	Base Not reachable from roots	Head Collections	Head Objects collected	Head Object visits	Head Reachable from roots	Head Not reachable from roots
0	0	0	0	0	0	0	0	0	0	0
1	13,758	160	398,569,461	24,052,537	35,840,023	13,769	160	398,635,872	24,023,421	35,860,265
2	0	0	0	0	0	0	0	0	0	0

Optimization (Tier 2) stats

statistics about the Tier 2 optimizer

Rare events

Counts of rare/unlikely events

Event	Base Count	Head Count	Change
set class ⓘ Setting an object's class, obj.__class__ = ...	0	0
set bases ⓘ Setting the bases of a class, cls.__bases__ = ...	0	0
set eval frame func ⓘ Setting the PEP 523 frame eval function _PyInterpreterState_SetFrameEvalFunc()	0	0
builtin dict ⓘ Modifying the builtins, __builtins__.__dict__[var] = ...	0	0
func modification ⓘ Modifying a function, e.g. func.__defaults__ = ..., etc.	0	0
watched dict modification ⓘ A watched dict has been modified	0	0
watched globals modification ⓘ A watched globals() dict has been modified	0	0

Meta stats

Meta statistics

	Base Count	Head Count	Change
Number of data files	20	20	0.0%

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Stats gathered on: 2025-04-16