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
DELETE_ATTR	129	120	-7.0%
BINARY_OP_MULTIPLY_FLOAT	179	180	0.6%
CALL_STR_1	421	420	-0.2%
TO_BOOL_STR	1,743	1,740	-0.2%
EXTENDED_ARG	1,542	1,540	-0.1%
POP_EXCEPT	1,962	1,960	-0.1%
STORE_SUBSCR	2,122	2,120	-0.1%
LOAD_SPECIAL	17,734	17,720	-0.1%
SET_FUNCTION_ATTRIBUTE	2,822	2,820	-0.1%
CALL_LEN	149,978	149,888	-0.1%
SWAP	26,015	26,000	-0.1%
MAKE_FUNCTION	3,722	3,720	-0.1%
CALL_KW_NON_PY	3,842	3,840	-0.1%
COMPARE_OP_INT	187,720	187,628	-0.0%
LOAD_ATTR_INSTANCE_VALUE	720,335	720,096	-0.0%
STORE_DEREF	16,625	16,620	-0.0%
CALL_NON_PY_GENERAL	172,546	172,500	-0.0%
JUMP_BACKWARD_NO_INTERRUPT	7,782	7,780	-0.0%
COPY	28,007	28,000	-0.0%
CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	20,205	20,200	-0.0%
DELETE_SUBSCR	25,346	25,340	-0.0%
LOAD_ATTR_PROPERTY	8,642	8,640	-0.0%
STORE_ATTR_INSTANCE_VALUE	111,564	111,540	-0.0%
MAKE_CELL	23,765	23,760	-0.0%
NOP	108,162	108,140	-0.0%
CALL	9,842	9,840	-0.0%
CALL_METHOD_DESCRIPTOR_O	45,229	45,220	-0.0%
LOAD_GLOBAL_BUILTIN	563,382	563,288	-0.0%
POP_JUMP_IF_NONE	133,002	132,980	-0.0%
BINARY_OP_SUBSCR_LIST_INT	6,239	6,240	0.0%
POP_TOP	431,886	431,820	-0.0%
LOAD_ATTR_METHOD_NO_DICT	192,669	192,640	-0.0%
INTERPRETER_EXIT	103,795	103,780	-0.0%
CALL_BUILTIN_O	8,099	8,100	0.0%
TO_BOOL_LIST	8,519	8,520	0.0%
LOAD_FAST	218,525	218,500	-0.0%
BINARY_OP_SUBSCR_DICT	9,181	9,180	-0.0%
LOAD_CONST_IMMORTAL	755,239	755,160	-0.0%
LOAD_FAST_BORROW	3,475,463	3,475,116	-0.0%
CALL_PY_GENERAL	20,762	20,760	-0.0%
POP_JUMP_IF_NOT_NONE	94,389	94,380	-0.0%
POP_JUMP_IF_FALSE	1,094,212	1,094,108	-0.0%
EXIT_INIT_CHECK	32,823	32,820	-0.0%
CALL_ALLOC_AND_ENTER_INIT	32,943	32,940	-0.0%
RETURN_VALUE	679,401	679,340	-0.0%
JUMP_FORWARD	82,327	82,320	-0.0%
CALL_PY_EXACT_ARGS	372,109	372,080	-0.0%
RESUME_CHECK	656,790	656,740	-0.0%
LOAD_DEREF	66,845	66,840	-0.0%
COPY_FREE_VARS	13,441	13,440	-0.0%
TO_BOOL	47,663	47,660	-0.0%
PUSH_NULL	256,696	256,680	-0.0%
LOAD_GLOBAL_MODULE	812,550	812,500	-0.0%
CALL_LIST_APPEND	17,459	17,460	0.0%
LOAD_ATTR_METHOD_WITH_VALUES	342,639	342,620	-0.0%
BUILD_TUPLE	74,584	74,580	-0.0%
COMPARE_OP	41,478	41,480	0.0%
BINARY_OP	84,144	84,140	-0.0%
STORE_FAST	721,092	721,060	-0.0%
TO_BOOL_NONE	49,442	49,440	-0.0%
BUILD_SLICE	25,199	25,200	0.0%
CALL_FUNCTION_EX	76,863	76,860	-0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	108,124	108,120	-0.0%
CALL_BUILTIN_FAST_WITH_KEYWORDS	27,181	27,180	-0.0%
POP_JUMP_IF_TRUE	437,756	437,740	-0.0%
TO_BOOL_BOOL	639,482	639,460	-0.0%
BUILD_MAP	59,462	59,460	-0.0%
LOAD_ATTR	290,689	290,680	-0.0%
FOR_ITER_LIST	33,599	33,600	0.0%
LOAD_CONST_MORTAL	105,903	105,900	-0.0%
STORE_SUBSCR_DICT	127,203	127,200	-0.0%
LOAD_ATTR_MODULE	219,485	219,480	-0.0%
TO_BOOL_INT	46,321	46,320	-0.0%
LOAD_SMALL_INT	250,445	250,440	-0.0%
BINARY_SLICE	51,419	51,420	0.0%
DICT_MERGE	57,241	57,240	-0.0%
LOAD_FAST_BORROW_LOAD_FAST_BORROW	765,673	765,660	-0.0%
CALL_BUILTIN_FAST	212,763	212,760	-0.0%
STORE_ATTR	161,521	161,520	-0.0%
JUMP_BACKWARD_NO_JIT	219,181	219,180	-0.0%
LOAD_ATTR_SLOT	974,460	974,460	0.0%
IS_OP	327,060	327,060	0.0%
FOR_ITER	186,480	186,480	0.0%
CONTAINS_OP_DICT	151,320	151,320	0.0%
STORE_ATTR_SLOT	136,040	136,040	0.0%
RETURN_GENERATOR	125,640	125,640	0.0%
SEND_GEN	122,820	122,820	0.0%
GET_AWAITABLE	119,520	119,520	0.0%
END_SEND	119,280	119,280	0.0%
LOAD_ATTR_WITH_HINT	78,120	78,120	0.0%
BINARY_OP_EXTEND	75,360	75,360	0.0%
CALL_KW_PY	56,520	56,520	0.0%
GET_ITER	53,160	53,160	0.0%
POP_ITER	52,860	52,860	0.0%
CALL_TYPE_1	44,520	44,520	0.0%
LOAD_ATTR_CLASS_WITH_METACLASS_CHECK	34,200	34,200	0.0%
CALL_ISINSTANCE	33,780	33,780	0.0%
LOAD_FAST_LOAD_FAST	33,600	33,600	0.0%
FOR_ITER_RANGE	33,540	33,540	0.0%
CALL_BOUND_METHOD_EXACT_ARGS	31,260	31,260	0.0%
BUILD_LIST	29,040	29,040	0.0%
CONTAINS_OP	27,920	27,920	0.0%
LOAD_ATTR_METHOD_LAZY_DICT	24,420	24,420	0.0%
STORE_FAST_STORE_FAST	21,540	21,540	0.0%
CALL_INTRINSIC_1	18,840	18,840	0.0%
LIST_EXTEND	18,420	18,420	0.0%
UNPACK_SEQUENCE_TWO_TUPLE	18,420	18,420	0.0%
CALL_METHOD_DESCRIPTOR_FAST	16,200	16,200	0.0%
BINARY_OP_ADD_INT	14,820	14,820	0.0%
LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES	13,680	13,680	0.0%
CALL_BUILTIN_CLASS	12,300	12,300	0.0%
LOAD_FAST_CHECK	12,120	12,120	0.0%
YIELD_VALUE	9,480	9,480	0.0%
UNPACK_SEQUENCE_TUPLE	7,860	7,860	0.0%
CONTAINS_OP_SET	7,800	7,800	0.0%
FOR_ITER_TUPLE	7,320	7,320	0.0%
DELETE_FAST	6,960	6,960	0.0%
LIST_APPEND	6,840	6,840	0.0%
UNARY_NOT	6,720	6,720	0.0%
LOAD_GLOBAL	6,280	6,280	0.0%
CALL_KW_BOUND_METHOD	6,240	6,240	0.0%
SEND	4,740	4,740	0.0%
COMPARE_OP_FLOAT	4,140	4,140	0.0%
LOAD_SUPER_ATTR_METHOD	4,020	4,020	0.0%
COMPARE_OP_STR	3,420	3,420	0.0%
BINARY_OP_ADD_FLOAT	2,820	2,820	0.0%
BINARY_OP_SUBTRACT_INT	2,580	2,580	0.0%
MAP_ADD	2,340	2,340	0.0%
STORE_ATTR_WITH_HINT	2,220	2,220	0.0%
FORMAT_SIMPLE	2,160	2,160	0.0%
CHECK_EXC_MATCH	2,040	2,040	0.0%
PUSH_EXC_INFO	1,980	1,980	0.0%
FOR_ITER_GEN	1,620	1,620	0.0%
TO_BOOL_ALWAYS_TRUE	1,620	1,620	0.0%
LOAD_ATTR_CLASS	1,440	1,440	0.0%
BUILD_STRING	1,140	1,140	0.0%
LOAD_SUPER_ATTR_ATTR	1,080	1,080	0.0%
BINARY_OP_SUBSCR_STR_INT	1,020	1,020	0.0%
LOAD_COMMON_CONSTANT	960	960	0.0%
UNPACK_SEQUENCE_LIST	900	900	0.0%
END_FOR	840	840	0.0%
UNARY_INVERT	840	840	0.0%
LOAD_FAST_AND_CLEAR	840	840	0.0%
RERAISE	660	660	0.0%
BINARY_OP_SUBSCR_GETITEM	600	600	0.0%
UNPACK_SEQUENCE	560	560	0.0%
CALL_KW	520	520	0.0%
BINARY_OP_ADD_UNICODE	480	480	0.0%
BUILD_SET	420	420	0.0%
STORE_FAST_LOAD_FAST	420	420	0.0%
BINARY_OP_SUBSCR_TUPLE_INT	420	420	0.0%
RAISE_VARARGS	360	360	0.0%
BINARY_OP_SUBTRACT_FLOAT	360	360	0.0%
BINARY_OP_MULTIPLY_INT	300	300	0.0%
CLEANUP_THROW	240	240	0.0%
UNARY_NEGATIVE	240	240	0.0%
LOAD_SUPER_ATTR	180	180	0.0%
BINARY_OP_INPLACE_ADD_UNICODE	120	120	0.0%
CALL_TUPLE_1	120	120	0.0%
CONVERT_VALUE	60	60	0.0%
IMPORT_NAME	60	60	0.0%
STORE_GLOBAL	60	60	0.0%
CALL_BOUND_METHOD_GENERAL	60	60	0.0%
LOAD_CONST	4

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.	82,502	40.3%	82,500	40.3%	-0.0%
hit ⓘ Specialized instructions that complete.	120,718	58.9%	120,720	58.9%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	1,062	64.7%	1,060	64.6%	-0.2%
Success	580	35.3%	580	35.4%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
subscr deque	21	2.0%	20	1.9%	-4.8%
remainder	161	15.2%	160	15.1%	-0.6%
add other	220	20.7%	220	20.8%	0.0%
subscr structtime	140	13.2%	140	13.2%	0.0%
subscr tuple slice	120	11.3%	120	11.3%	0.0%
floor divide	100	9.4%	100	9.4%	0.0%
out of range	40	3.8%	40	3.8%	0.0%
code complex parameters	40	3.8%	40	3.8%	0.0%
multiply different types	40	3.8%	40	3.8%	0.0%
or different types	40	3.8%	40	3.8%	0.0%
xor int	40	3.8%	40	3.8%	0.0%
subscr bytes	40	3.8%	40	3.8%	0.0%
and int	20	1.9%	20	1.9%	0.0%
or int	20	1.9%	20	1.9%	0.0%
subscr string slice	20	1.9%	20	1.9%	0.0%

BINARY_SLICE

specialization stats for BINARY_SLICE family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	51,419	100.0%	51,420	100.0%	0.0%

CALL

specialization stats for CALL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	1,130,111	96.3%	1,129,968	96.3%	-0.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	33,362	2.8%	33,360	2.8%	-0.0%
miss ⓘ Specialized instructions that deopt.	33,840	2.9%	33,840	2.9%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	10,300	99.8%	10,300	99.8%	0.0%
Failure	20	0.2%	20	0.2%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
init not simple	40	200.0%	40	200.0%	0.0%
out of versions	20	100.0%	20	100.0%	0.0%
init not python	20	100.0%	20	100.0%	0.0%

CALL_KW

specialization stats for CALL_KW family

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	520	100.0%	520	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
miss ⓘ Specialized instructions that deopt.	239	0.1%	240	0.1%	0.4%
hit ⓘ Specialized instructions that complete.	195,041	82.4%	194,948	82.4%	-0.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	39,839	16.8%	39,840	16.8%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	819	50.0%	820	50.0%	0.1%
Success	820	50.0%	820	50.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
float long	99	12.1%	100	12.2%	1.0%
other	400	48.8%	400	48.8%	0.0%
different types	120	14.7%	120	14.6%	0.0%
bytes	100	12.2%	100	12.2%	0.0%
bool	60	7.3%	60	7.3%	0.0%
big int	40	4.9%	40	4.9%	0.0%

CONTAINS_OP

specialization stats for CONTAINS_OP family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	27,300	14.6%	27,300	14.6%	0.0%
hit ⓘ Specialized instructions that complete.	159,120	85.1%	159,120	85.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	40	6.5%	40	6.5%	0.0%
Failure	580	93.5%	580	93.5%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
tuple	380	65.5%	380	65.5%	0.0%
str	140	24.1%	140	24.1%	0.0%
list	60	10.3%	60	10.3%	0.0%

FOR_ITER

specialization stats for FOR_ITER family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	76,079	29.0%	76,080	29.0%	0.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	185,580	70.7%	185,580	70.7%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	360	40.0%	360	40.0%	0.0%
Failure	540	60.0%	540	60.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
set	140	25.9%	140	25.9%	0.0%
dict items	80	14.8%	80	14.8%	0.0%
ascii string	80	14.8%	80	14.8%	0.0%
dict values	60	11.1%	60	11.1%	0.0%
enumerate	60	11.1%	60	11.1%	0.0%
bytes	40	7.4%	40	7.4%	0.0%
reversed list	40	7.4%	40	7.4%	0.0%
other	20	3.7%	20	3.7%	0.0%
itertools	20	3.7%	20	3.7%	0.0%

LOAD_ATTR

specialization stats for LOAD_ATTR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	2,504,452	86.3%	2,504,167	86.3%	-0.0%
miss ⓘ Specialized instructions that deopt.	105,638	3.6%	105,629	3.6%	-0.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	273,547	9.4%	273,540	9.4%	-0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	4,082	24.1%	4,080	24.1%	-0.0%
Success	12,840	75.9%	12,840	75.9%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
method	922	22.6%	920	22.5%	-0.2%
overriding descriptor	1,220	29.9%	1,220	29.9%	0.0%
mutable class	700	17.1%	700	17.2%	0.0%
module attr not found	620	15.2%	620	15.2%	0.0%
non object slot	160	3.9%	160	3.9%	0.0%
builtin class method	140	3.4%	140	3.4%	0.0%
class method obj	140	3.4%	140	3.4%	0.0%
metaclass attribute	20	0.5%	20	0.5%	0.0%

LOAD_GLOBAL

specialization stats for LOAD_GLOBAL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	1,374,792	99.5%	1,374,648	99.5%	-0.0%
deopt ⓘ Specialized instructions that deopt.	120	0.0%	120	0.0%	0.0%
miss ⓘ Specialized instructions that deopt.	1,140	0.1%	1,140	0.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	6,280	100.0%	6,280	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.	5,100	96.6%	5,100	96.6%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	180	100.0%	180	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.	4,020	3.2%	4,020	3.2%	0.0%
hit ⓘ Specialized instructions that complete.	122,820	96.3%	122,820	96.3%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	240	33.3%	240	33.3%	0.0%
Failure	480	66.7%	480	66.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
other	480	100.0%	480	100.0%	0.0%

STORE_ATTR

specialization stats for STORE_ATTR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	238,624	58.0%	238,600	58.0%	-0.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	157,321	38.2%	157,320	38.2%	-0.0%
miss ⓘ Specialized instructions that deopt.	11,200	2.7%	11,200	2.7%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	2,900	66.8%	2,900	66.8%	0.0%
Failure	1,440	33.2%	1,440	33.2%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
not in dict	940	65.3%	940	65.3%	0.0%
class attr simple	260	18.1%	260	18.1%	0.0%
overriding descriptor	80	5.6%	80	5.6%	0.0%
method	60	4.2%	60	4.2%	0.0%
not managed dict	60	4.2%	60	4.2%	0.0%
not in keys	20	1.4%	20	1.4%	0.0%

STORE_SUBSCR

specialization stats for STORE_SUBSCR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	1,741	1.3%	1,740	1.3%	-0.1%
hit ⓘ Specialized instructions that complete.	127,203	98.4%	127,200	98.4%	-0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	301	79.0%	300	78.9%	-0.3%
Success	80	21.0%	80	21.1%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
py simple	301	100.0%	300	100.0%	-0.3%

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.	44,402	5.6%	44,400	5.6%	-0.0%
hit ⓘ Specialized instructions that complete.	745,447	94.0%	745,420	94.0%	-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
Failure	561	17.2%	560	17.2%	-0.2%
Success	2,700	82.8%	2,700	82.8%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
sequence	161	28.7%	160	28.6%	-0.6%
bytes	160	28.5%	160	28.6%	0.0%
dict	80	14.3%	80	14.3%	0.0%
memory view	40	7.1%	40	7.1%	0.0%
set	40	7.1%	40	7.1%	0.0%
tuple	40	7.1%	40	7.1%	0.0%
float	20	3.6%	20	3.6%	0.0%
mapping	20	3.6%	20	3.6%	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.	27,180	98.0%	27,180	98.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	560	100.0%	560	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`.	915,558	4.5%	968,700	4.8%	5.8%
Basic ⓘ Instructions that are not and cannot be specialized, e.g. `LOAD_FAST`.	10,391,477	51.3%	10,337,464	51.1%	-0.5%
Specialized hits ⓘ Specialized instructions, e.g. `LOAD_ATTR_MODULE` that complete.	8,787,891	43.4%	8,786,991	43.4%	-0.0%
Specialized misses ⓘ Specialized instructions, e.g. `LOAD_ATTR_MODULE` that deopt.	152,117	0.8%	152,109	0.8%	-0.0%

Deferred by instruction

Breakdown of deferred (not specialized) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
CALL	33,362	3.7%	33,360	3.7%	-0.0%
TO_BOOL	44,402	4.9%	44,400	4.9%	-0.0%
LOAD_ATTR	273,547	30.4%	273,540	30.4%	-0.0%
COMPARE_OP	39,839	4.4%	39,840	4.4%	0.0%
BINARY_OP	82,502	9.2%	82,500	9.2%	-0.0%
BINARY_SLICE	51,419	5.7%	51,420	5.7%	0.0%
STORE_ATTR	157,321	17.5%	157,320	17.5%	-0.0%
FOR_ITER	185,580	20.6%	185,580	20.6%	0.0%
CONTAINS_OP	27,300	3.0%	27,300	3.0%	0.0%
SEND	4,020	0.4%	4,020	0.4%	0.0%

Misses by instruction

Breakdown of misses (specialized deopts) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
LOAD_ATTR_METHOD_WITH_VALUES	72,309	47.5%	72,309	47.5%	0.0%
CALL_BUILTIN_FAST_WITH_KEYWORDS	24,840	16.3%	24,840	16.3%	0.0%
LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES	12,600	8.3%	12,600	8.3%	0.0%
STORE_ATTR_SLOT	10,420	6.8%	10,420	6.9%	0.0%
LOAD_ATTR_WITH_HINT	7,800	5.1%	7,800	5.1%	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	7,680	5.0%	7,680	5.0%	0.0%
LOAD_ATTR_CLASS_WITH_METACLASS_CHECK	6,360	4.2%	6,360	4.2%	0.0%
LOAD_ATTR_SLOT	5,000	3.3%	5,000	3.3%	0.0%
LOAD_ATTR_METHOD_NO_DICT	900	0.6%	900	0.6%	0.0%
LOAD_GLOBAL_BUILTIN	840	0.6%	840	0.6%	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 via PyEval_EvalFrame (api)	387	0.0%	380	0.0%	-1.8%
Frame objects created	2,541	0.3%	2,540	0.3%	-0.0%
Calls via PyEval_EvalFrame (slot)	3,781	0.5%	3,780	0.5%	-0.0%
Calls via PyEval_EvalFrame (vector)	93,571	12.0%	93,560	12.0%	-0.0%
Calls via PyEval_EvalFrame (function vectorcall)	93,571	12.0%	93,560	12.0%	-0.0%
Calls to PyEval_EvalDefault	104,131	13.3%	104,120	13.3%	-0.0%
Calls via PyEval_EvalFrame (total)	104,131	13.3%	104,120	13.3%	-0.0%
Frames pushed	680,613	87.0%	680,560	87.0%	-0.0%
Calls to Python functions inlined	678,539	86.7%	678,500	86.7%	-0.0%
Calls via PyEval_EvalFrame (function ex)	24,961	3.2%	24,960	3.2%	-0.0%
Calls via PyEval_EvalFrame (generator)	10,560	1.3%	10,560	1.3%	0.0%
Calls via PyEval_EvalFrame (legacy)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (build class)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (method)	25,080	3.2%	25,080	3.2%	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	2,273		2,004		-11.8%
Method cache collisions	10,622		9,940		-6.4%
Method cache misses	8,453		8,048		-4.8%
Method cache dunder hits	218,408		218,656		0.1%
Immortal increfs	2,887,014	26.3%	2,885,549	26.3%	-0.1%
Method cache hits	767,165		767,541		0.0%
Mortal decrefs	2,613,715	22.0%	2,612,844	22.0%	-0.0%
Immortal decrefs	2,789,496	23.5%	2,788,604	23.5%	-0.0%
Mortal increfs	2,603,289	23.7%	2,602,563	23.7%	-0.0%
Frees to freelist	872,603		872,468		-0.0%
Allocations from freelist	874,737	52.4%	874,623	52.4%	-0.0%
Frees	784,891		784,796		-0.0%
Interpreter mortal decrefs	6,137,415	51.7%	6,136,712	51.7%	-0.0%
Interpreter mortal increfs	4,751,069	43.2%	4,750,535	43.2%	-0.0%
Inline values	48,424		48,420		-0.0%
Allocations to 512 bytes	655,263	39.2%	655,225	39.2%	-0.0%
Allocations	795,794	47.6%	795,753	47.6%	-0.0%
Allocations to 4 kbytes	97,539	5.8%	97,534	5.8%	-0.0%
Allocations over 4 kbytes	42,992	2.6%	42,994	2.6%	0.0%
Interpreter immortal increfs	753,083	6.8%	753,060	6.9%	-0.0%
Interpreter immortal decrefs	326,581	2.8%	326,580	2.8%	-0.0%
Materialize dict (on request)	0	0.0%	0	0.0%
Materialize dict (new key)	120	0.2%	120	0.2%	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	0	0	0	0	0	0	0	0	0	0
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%

Stats gathered on: 2025-04-16

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Execution counts

Pair counts

Predecessor/Successor Pairs

Specialization stats

BINARY_OP

BINARY_SLICE

CALL

CALL_KW

COMPARE_OP

CONTAINS_OP

FOR_ITER

LOAD_ATTR

LOAD_GLOBAL

LOAD_SUPER_ATTR

SEND

STORE_ATTR

STORE_SUBSCR

TO_BOOL

UNPACK_SEQUENCE

Specialization effectiveness

Deferred by instruction

Misses by instruction

Call stats

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