bm-20250206-azure-x86_64-brandtbucher-justin_compact_exits-3.14.0a4+-aa6e11c-pystats-concurrent_imap-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
BINARY_OP_SUBTRACT_FLOAT	540,662	604,932	11.9%
TO_BOOL_LIST	1,102,314	1,230,837	11.7%
CONTAINS_OP_DICT	1,111,367	1,240,460	11.6%
LOAD_SUPER_ATTR_METHOD	1,499,521	1,672,675	11.5%
LIST_EXTEND	371,394	414,228	11.5%
COMPARE_OP	754,648	841,024	11.4%
CALL_ISINSTANCE	769,954	857,438	11.4%
COPY_FREE_VARS	1,527,770	1,700,924	11.3%
LOAD_DEREF	1,565,591	1,738,745	11.1%
TO_BOOL_INT	3,876,865	4,304,345	11.0%
IMPORT_FROM	394,205	437,058	10.9%
LOAD_FAST_AND_CLEAR	591,114	655,331	10.9%
IMPORT_NAME	394,528	437,381	10.9%
BINARY_OP_ADD_FLOAT	198,138	219,435	10.7%
BINARY_OP_EXTEND	5,190,895	5,740,534	10.6%
CALL_METHOD_DESCRIPTOR_FAST	1,418,117	1,565,254	10.4%
LIST_APPEND	622,091	686,335	10.3%
BUILD_MAP	850,897	936,567	10.1%
BUILD_LIST	1,449,009	1,594,735	10.1%
CALL_KW_PY	215,959	237,376	9.9%
UNARY_NOT	219,003	240,402	9.8%
CALL_BOUND_METHOD_GENERAL	221,837	243,246	9.7%
JUMP_FORWARD	1,286,740	1,410,912	9.7%
LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES	1,311,179	1,434,573	9.4%
CALL_NON_PY_GENERAL	6,385,317	6,982,896	9.4%
GET_ITER	1,979,169	2,162,909	9.3%
POP_JUMP_IF_NOT_NONE	2,704,886	2,954,744	9.2%
LOAD_GLOBAL_MODULE	12,521,356	13,673,710	9.2%
STORE_ATTR_INSTANCE_VALUE	4,547,045	4,951,497	8.9%
UNARY_INVERT	936,209	1,017,969	8.7%
LOAD_ATTR_MODULE	2,217,390	2,409,979	8.7%
LOAD_FAST_LOAD_FAST	9,353,925	10,161,867	8.6%
CALL_PY_EXACT_ARGS	8,964,975	9,705,238	8.3%
LOAD_ATTR	7,494,429	8,109,367	8.2%
STORE_SUBSCR_DICT	1,584,343	1,714,266	8.2%
POP_JUMP_IF_FALSE	11,443,880	12,369,377	8.1%
LOAD_SMALL_INT	3,396,034	3,669,374	8.0%
LOAD_ATTR_METHOD_WITH_VALUES	5,601,632	6,049,739	8.0%
FOR_ITER_LIST	1,780,316	1,919,858	7.8%
JUMP_BACKWARD	103	111	7.8%
POP_JUMP_IF_TRUE	2,123,569	2,286,026	7.7%
LOAD_GLOBAL_BUILTIN	5,226,132	5,620,655	7.5%
SWAP	5,069,559	5,444,348	7.4%
LOAD_FAST	65,802,830	70,524,326	7.2%
RETURN_VALUE	24,827,888	26,560,879	7.0%
CALL_PY_GENERAL	3,150,254	3,362,932	6.8%
LOAD_FAST_CHECK	975,492	1,039,754	6.6%
LOAD_SPECIAL	2,673,892	2,845,216	6.4%
POP_TOP	13,525,068	14,377,888	6.3%
LOAD_CONST_MORTAL	1,019,246	1,083,510	6.3%
BUILD_TUPLE	2,338,812	2,485,884	6.3%
LOAD_ATTR_METHOD_NO_DICT	3,268,271	3,473,608	6.3%
TO_BOOL_BOOL	3,561,563	3,783,818	6.2%
RESUME_CHECK	21,659,383	23,006,136	6.2%
RESUME	476	505	6.1%
LOAD_CONST_IMMORTAL	14,741,543	15,556,958	5.5%
NOP	4,827,548	5,084,008	5.3%
BINARY_SUBSCR_LIST_INT	98,108	92,909	-5.3%
LOAD_ATTR_INSTANCE_VALUE	13,326,086	14,020,432	5.2%
COMPARE_OP_INT	2,393,593	2,517,632	5.2%
STORE_FAST	19,636,617	20,639,556	5.1%
COPY	6,786,798	7,124,944	5.0%
CALL_METHOD_DESCRIPTOR_NOARGS	1,263,981	1,325,778	4.9%
LOAD_ATTR_PROPERTY	347,531	363,355	4.6%
INTERPRETER_EXIT	8,446,535	8,810,660	4.3%
ENTER_EXECUTOR	8,694,388	9,042,033	4.0%
FOR_ITER_RANGE	156,318	150,704	-3.6%
CALL_BUILTIN_CLASS	1,027,251	1,057,472	2.9%
CALL_BUILTIN_FAST	617,304	635,402	2.9%
CALL_LIST_APPEND	103,370	100,506	-2.8%
UNPACK_SEQUENCE_TWO_TUPLE	743,357	761,897	2.5%
LOAD_CONST	1,613	1,651	2.4%
CALL_LEN	218,698	213,885	-2.2%
PUSH_NULL	5,045,797	5,147,992	2.0%
TO_BOOL	186,031	182,378	-2.0%
CALL	4,536	4,610	1.6%
JUMP_BACKWARD_JIT	761,242	750,191	-1.5%
STORE_FAST_STORE_FAST	1,620,644	1,639,184	1.1%
COMPARE_OP_STR	559,166	554,361	-0.9%
POP_JUMP_IF_NONE	382,120	379,470	-0.7%
TO_BOOL_ALWAYS_TRUE	345	347	0.6%
LOAD_GLOBAL	3,226	3,243	0.5%
JUMP_BACKWARD_NO_INTERRUPT	4,864	4,878	0.3%
POP_ITER	848,014	846,809	-0.1%
CHECK_EXC_MATCH	13,261	13,275	0.1%
POP_EXCEPT	17,484	17,498	0.1%
PUSH_EXC_INFO	17,484	17,498	0.1%
LOAD_ATTR_METHOD_LAZY_DICT	97,273	97,205	-0.1%
BINARY_SUBSCR	40,643	40,661	0.0%
UNPACK_SEQUENCE_TUPLE	46,396	46,379	-0.0%
IS_OP	34,046	34,053	0.0%
BINARY_OP_SUBTRACT_INT	102,138	102,118	-0.0%
CALL_METHOD_DESCRIPTOR_O	200,727	200,689	-0.0%
CALL_BOUND_METHOD_EXACT_ARGS	35,134	35,129	-0.0%
BINARY_OP	68,019	68,028	0.0%
STORE_SUBSCR	21,466	21,468	0.0%
NOT_TAKEN	16,600	16,601	0.0%
BINARY_OP_ADD_INT	452,914	452,888	-0.0%
CALL_BUILTIN_FAST_WITH_KEYWORDS	928,748	928,695	-0.0%
STORE_FAST_LOAD_FAST	168,823	168,814	-0.0%
TO_BOOL_NONE	191,018	191,025	0.0%
FOR_ITER	115,815	115,812	-0.0%
STORE_ATTR	81,656	81,658	0.0%
CALL_FUNCTION_EX	1,818,668	1,818,660	-0.0%
YIELD_VALUE	5,068,282	5,068,282	0.0%
MAKE_CELL	105,142	105,142	0.0%
STORE_DEREF	105,110	105,110	0.0%
FOR_ITER_GEN	87,032	87,032	0.0%
CALL_BUILTIN_O	86,432	86,432	0.0%
BINARY_SUBSCR_DICT	84,725	84,725	0.0%
CALL_KW_NON_PY	77,368	77,368	0.0%
BINARY_OP_MULTIPLY_FLOAT	68,756	68,756	0.0%
BINARY_SUBSCR_STR_INT	68,756	68,756	0.0%
DELETE_SUBSCR	67,589	67,589	0.0%
DELETE_ATTR	63,345	63,345	0.0%
DICT_MERGE	59,119	59,119	0.0%
CALL_ALLOC_AND_ENTER_INIT	55,866	55,866	0.0%
EXIT_INIT_CHECK	55,862	55,862	0.0%
CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	51,440	51,440	0.0%
BINARY_SUBSCR_TUPLE_INT	44,014	44,014	0.0%
MAKE_FUNCTION	42,904	42,904	0.0%
LOAD_ATTR_CLASS	38,452	38,452	0.0%
FORMAT_SIMPLE	38,409	38,409	0.0%
BUILD_STRING	29,697	29,697	0.0%
SET_FUNCTION_ATTRIBUTE	29,559	29,559	0.0%
LOAD_SUPER_ATTR_ATTR	23,800	23,800	0.0%
TO_BOOL_STR	21,938	21,938	0.0%
BINARY_OP_INPLACE_ADD_UNICODE	20,988	20,988	0.0%
FOR_ITER_TUPLE	17,858	17,858	0.0%
CONVERT_VALUE	17,404	17,404	0.0%
CALL_TUPLE_1	14,867	14,867	0.0%
BINARY_SLICE	14,143	14,143	0.0%
RETURN_GENERATOR	12,839	12,839	0.0%
RERAISE	12,672	12,672	0.0%
LOAD_ATTR_SLOT	10,286	10,286	0.0%
STORE_ATTR_SLOT	9,870	9,870	0.0%
CALL_STR_1	8,491	8,491	0.0%
END_FOR	8,446	8,446	0.0%
RAISE_VARARGS	4,227	4,227	0.0%
WITH_EXCEPT_START	4,223	4,223	0.0%
STORE_NAME	806	806	0.0%
JUMP_BACKWARD_NO_JIT	543	543	0.0%
BINARY_OP_ADD_UNICODE	522	522	0.0%
CONTAINS_OP_SET	415	415	0.0%
CONTAINS_OP	322	322	0.0%
LOAD_NAME	267	267	0.0%
CALL_KW	183	183	0.0%
CALL_TYPE_1	154	154	0.0%
UNPACK_SEQUENCE	149	149	0.0%
EXTENDED_ARG	129	129	0.0%
DELETE_FAST	128	128	0.0%
LOAD_SUPER_ATTR	68	68	0.0%
LOAD_BUILD_CLASS	42	42	0.0%
LOAD_LOCALS	38	38	0.0%
COMPARE_OP_FLOAT	29	29	0.0%
CALL_INTRINSIC_1	16	16	0.0%
LOAD_ATTR_CLASS_WITH_METACLASS_CHECK	12	12	0.0%
DELETE_NAME	6	6	0.0%
STORE_GLOBAL	4	4	0.0%
BINARY_SUBSCR_GETITEM	3	3	0.0%
BUILD_SET	2	2	0.0%
MAP_ADD	1	1	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
hit ⓘ Specialized instructions that complete.	9,272,976	99.1%	10,237,648	99.2%	10.4%
miss ⓘ Specialized instructions that deopt.	19,075	0.2%	18,160	0.2%	-4.8%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	67,332	0.7%	67,340	0.7%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	506	48.1%	489	47.2%	-3.4%
Failure	547	51.9%	547	52.8%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
remainder	292	53.4%	292	53.4%	0.0%
add different types	187	34.2%	187	34.2%	0.0%
add other	66	12.1%	66	12.1%	0.0%
and int	2	0.4%	2	0.4%	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.	14,143	100.0%	14,143	100.0%	0.0%

BINARY_SUBSCR

specialization stats for BINARY_SUBSCR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	578,088	93.4%	620,922	93.9%	7.4%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	40,381	6.5%	40,395	6.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	144	55.0%	148	55.6%	2.8%
Success	118	45.0%	118	44.4%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
buffer int	143	99.3%	147	99.3%	2.8%
list slice	1	0.7%	1	0.7%	0.0%

CALL

specialization stats for CALL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	23,383,421	100.0%	25,353,591	100.0%	8.4%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	1,996	0.0%	2,056	0.0%	3.0%
miss ⓘ Specialized instructions that deopt.	796	0.0%	796	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	3,336	100.0%	3,350	100.0%	0.4%
Failure	0	0.0%	0	0.0%

CALL_KW

specialization stats for CALL_KW family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	43	23.5%	43	23.5%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	140	100.0%	140	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.	753,390	14.9%	839,761	15.6%	11.5%
hit ⓘ Specialized instructions that complete.	4,268,651	84.7%	4,525,584	84.0%	6.0%
miss ⓘ Specialized instructions that deopt.	18,639	0.4%	17,967	0.3%	-3.6%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	608	38.0%	593	37.2%	-2.5%
Failure	994	62.0%	1,000	62.8%	0.6%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
float long	702	70.6%	708	70.8%	0.9%
different types	151	15.2%	151	15.1%	0.0%
big int	96	9.7%	96	9.6%	0.0%
bytes	44	4.4%	44	4.4%	0.0%
list	1	0.1%	1	0.1%	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.	1,693,687	100.0%	1,843,623	100.0%	8.9%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	270	0.0%	270	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	9	17.3%	9	17.3%	0.0%
Failure	43	82.7%	43	82.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
tuple	43	100.0%	43	100.0%	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.	6,608,234	98.3%	6,742,162	98.3%	2.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	115,488	1.7%	115,483	1.7%	-0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	51	15.6%	53	16.1%	3.9%
Failure	276	84.4%	276	83.9%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
itertools	77	27.9%	77	27.9%	0.0%
callable	70	25.4%	70	25.4%	0.0%
other	58	21.0%	58	21.0%	0.0%
enumerate	58	21.0%	58	21.0%	0.0%
dict items	7	2.5%	7	2.5%	0.0%
dict values	3	1.1%	3	1.1%	0.0%
set	2	0.7%	2	0.7%	0.0%
reversed list	1	0.4%	1	0.4%	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.	7,483,326	16.1%	8,098,075	16.2%	8.2%
hit ⓘ Specialized instructions that complete.	38,586,891	83.0%	41,391,486	83.0%	7.3%
miss ⓘ Specialized instructions that deopt.	383,476	0.8%	382,689	0.8%	-0.2%
deopt ⓘ Specialized instructions that deopt.	6	0.0%	6	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	6,624	36.7%	6,795	37.3%	2.6%
Success	11,410	63.3%	11,426	62.7%	0.1%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
overriding descriptor	1,614	24.4%	1,715	25.2%	6.3%
non overriding descriptor	818	12.3%	836	12.3%	2.2%
overridden	681	10.3%	683	10.1%	0.3%
method	1,432	21.6%	1,432	21.1%	0.0%
non object slot	460	6.9%	460	6.8%	0.0%
mutable class	71	1.1%	71	1.0%	0.0%
class method obj	68	1.0%	68	1.0%	0.0%
not managed dict	45	0.7%	45	0.7%	0.0%
metaclass attribute	23	0.3%	23	0.3%	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.	17,747,245	100.0%	19,294,122	100.0%	8.7%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	847	0.0%	865	0.0%	2.1%
deopt ⓘ Specialized instructions that deopt.	9	0.0%	9	0.0%	0.0%
miss ⓘ Specialized instructions that deopt.	243	0.0%	243	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	2,385	100.0%	2,384	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.	2,046,633	100.0%	2,282,239	100.0%	11.5%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	13	0.0%	13	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	55	100.0%	55	100.0%	0.0%
Failure	0	0.0%	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.	4,894,365	95.7%	5,322,714	96.0%	8.8%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	79,936	1.6%	79,937	1.4%	0.0%
miss ⓘ Specialized instructions that deopt.	140,400	2.7%	140,400	2.5%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	3,613	82.9%	3,614	82.9%	0.0%
Failure	743	17.1%	743	17.1%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
other	716	96.4%	742	99.9%	3.6%
property	344	46.3%	344	46.3%	0.0%
class attr simple	206	27.7%	206	27.7%	0.0%
split dict	44	5.9%	44	5.9%	0.0%
not in keys	10	1.3%	10	1.3%	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.	1,758,779	98.8%	1,909,520	98.9%	8.6%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	21,263	1.2%	21,264	1.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	16	7.9%	17	8.3%	6.2%
Failure	187	92.1%	187	91.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
py simple	119	63.6%	119	63.6%	0.0%
other	68	36.4%	68	36.4%	0.0%

TO_BOOL

specialization stats for TO_BOOL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	11,430,907	98.4%	12,607,288	98.6%	10.3%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	184,811	1.6%	181,164	1.4%	-2.0%
miss ⓘ Specialized instructions that deopt.	28	0.0%	28	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	764	62.6%	757	62.4%	-0.9%
Success	456	37.4%	457	37.6%	0.2%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
sequence	148	19.4%	140	18.5%	-5.4%
mapping	312	40.8%	313	41.3%	0.3%
tuple	126	16.5%	126	16.6%	0.0%
other	111	14.5%	111	14.7%	0.0%
memory view	44	5.8%	44	5.8%	0.0%
bytes	22	2.9%	22	2.9%	0.0%
set	1	0.1%	1	0.1%	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.	2,112,743	100.0%	2,155,526	100.0%	2.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	38	0.0%	38	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	111	100.0%	111	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.	8,785,334	2.4%	9,483,114	2.4%	7.9%
Specialized hits ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that complete.	137,586,171	37.4%	147,477,238	37.6%	7.2%
Basic ⓘ Instructions that are not and cannot be specialized, e.g. LOAD_FAST.	220,531,706	60.0%	234,687,647	59.8%	6.4%
Specialized misses ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that deopt.	562,718	0.2%	560,283	0.1%	-0.4%

Deferred by instruction

Breakdown of deferred (not specialized) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
COMPARE_OP	753,390	8.6%	839,761	8.9%	11.5%
LOAD_ATTR	7,483,326	85.4%	8,098,075	85.6%	8.2%
CALL	1,996	0.0%	2,056	0.0%	3.0%
TO_BOOL	184,811	2.1%	181,164	1.9%	-2.0%
BINARY_SUBSCR	40,381	0.5%	40,395	0.4%	0.0%
BINARY_OP	67,332	0.8%	67,340	0.7%	0.0%
STORE_SUBSCR	21,263	0.2%	21,264	0.2%	0.0%
FOR_ITER	115,488	1.3%	115,483	1.2%	-0.0%
STORE_ATTR	79,936	0.9%	79,937	0.8%	0.0%
BINARY_SLICE	14,143	0.2%	14,143	0.1%	0.0%

Misses by instruction

Breakdown of misses (specialized deopts) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
BINARY_OP_ADD_FLOAT	9,385	1.7%	8,880	1.6%	-5.4%
BINARY_OP_EXTEND	9,690	1.7%	9,280	1.7%	-4.2%
COMPARE_OP_INT	18,638	3.3%	17,966	3.2%	-3.6%
LOAD_ATTR_INSTANCE_VALUE	314,056	55.8%	313,266	55.9%	-0.3%
LOAD_ATTR_METHOD_WITH_VALUES	59,388	10.6%	59,391	10.6%	0.0%
STORE_ATTR_INSTANCE_VALUE	140,400	24.9%	140,400	25.1%	0.0%
LOAD_ATTR_PROPERTY	9,895	1.8%	9,895	1.8%	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	398	0.1%	398	0.1%	0.0%
CALL_METHOD_DESCRIPTOR_O	275	0.0%	275	0.0%	0.0%
LOAD_GLOBAL_BUILTIN	149	0.0%	149	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 via PyEval_EvalFrame (api)	501,751	1.6%	544,600	1.6%	8.5%
Frames pushed	26,666,242	84.1%	28,720,690	85.1%	7.7%
Calls to Python functions inlined	23,240,608	73.3%	24,930,931	73.9%	7.3%
Calls via PyEval_EvalFrame (function vectorcall)	8,023,455	25.3%	8,387,580	24.9%	4.5%
Calls via PyEval_EvalFrame (vector)	8,023,514	25.3%	8,387,639	24.9%	4.5%
Calls to PyEval_EvalDefault	8,450,893	26.7%	8,815,018	26.1%	4.3%
Calls via PyEval_EvalFrame (total)	8,450,893	26.7%	8,815,018	26.1%	4.3%
Frame objects created	17,499	0.1%	17,513	0.1%	0.1%
Calls via PyEval_EvalFrame (generator)	427,379	1.3%	427,379	1.3%	0.0%
Calls via PyEval_EvalFrame (legacy)	17	0.0%	17	0.0%	0.0%
Calls via PyEval_EvalFrame (build class)	42	0.0%	42	0.0%	0.0%
Calls via PyEval_EvalFrame (slot)	456,471	1.4%	456,471	1.4%	0.0%
Calls via PyEval_EvalFrame (function ex)	441,509	1.4%	441,509	1.3%	0.0%
Calls via PyEval_EvalFrame (method)	2	0.0%	2	0.0%	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
Inline values	1,621,364		1,792,704		10.6%
Method cache dunder misses	34,774		31,184		-10.3%
Method cache hits	11,171,395		12,308,956		10.2%
Immortal increfs	60,944,403	15.4%	65,996,460	15.5%	8.3%
Interpreter immortal decrefs	75,550,330	15.7%	81,663,848	15.9%	8.1%
Interpreter immortal increfs	57,620,660	14.5%	62,126,428	14.6%	7.8%
Immortal decrefs	92,810,495	19.3%	99,867,335	19.4%	7.6%
Allocations from freelist	22,402,586	59.3%	24,072,157	59.7%	7.5%
Frees to freelist	22,404,293		24,073,945		7.5%
Interpreter mortal decrefs	185,250,636	38.6%	198,560,068	38.6%	7.2%
Method cache dunder hits	11,471,833		12,289,311		7.1%
Mortal increfs	134,472,002	33.9%	144,037,045	33.9%	7.1%
Interpreter mortal increfs	143,183,381	36.1%	152,715,093	35.9%	6.7%
Mortal decrefs	126,418,431	26.3%	134,431,711	26.1%	6.3%
Method cache collisions	108,447		101,955		-6.0%
Frees	16,764,658		17,749,215		5.9%
Allocations to 512 bytes	15,278,480	40.4%	16,113,195	40.0%	5.5%
Allocations	15,399,797	40.7%	16,234,555	40.3%	5.4%
Method cache misses	73,954		71,096		-3.9%
Allocations to 4 kbytes	77,720	0.2%	77,756	0.2%	0.0%
Allocations over 4 kbytes	43,597	0.1%	43,604	0.1%	0.0%
Materialize dict (on request)	640	0.0%	640	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	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

	Base Count	Base Ratio	Head Count	Head Ratio	Change
Trace stack overflow ⓘ A trace is truncated because it would require more than 5 stack frames.	54	2.6%	68	3.1%	25.9%
Uops executed ⓘ The total number of uops (micro-operations) that were executed	414,888,220	2,012.8%	443,623,689	2,083.0%	6.9%
Trace too short ⓘ A potential trace is abandoned because it it too short.	1,777	84.4%	1,853	84.6%	4.3%
Optimization attempts ⓘ The number of times a potential trace is identified. Specifically, this occurs in the JUMP BACKWARD instruction when the counter reaches a threshold.	2,106		2,190		4.0%
Trace stack underflow ⓘ A potential trace is abandoned because it pops more frames than it pushes.	1,790	85.0%	1,861	85.0%	4.0%
Traces executed ⓘ The number of traces that were executed	20,612,205		21,297,127		3.3%
Traces created ⓘ The number of traces that were successfully created.	275	13.1%	269	12.3%	-2.2%
Trace too long ⓘ A trace is truncated because it is longer than the instruction buffer.	0	0.0%	0	0.0%
Inner loop found ⓘ A trace is truncated because it has an inner loop	13	0.6%	13	0.6%	0.0%
Recursive call ⓘ A trace is truncated because it has a recursive call.	0	0.0%	0	0.0%
Low confidence ⓘ A trace is abandoned because the likelihood of the jump to top being taken is too low.	0	0.0%	0	0.0%
Executors invalidated ⓘ The number of executors that were invalidated due to watched dictionary changes.	0	0.0%	0	0.0%

	Base Count	Base Ratio	Head Count	Head Ratio	Change
Optimizer attempts ⓘ The number of times the trace optimizer (_Py_uop_analyze_and_optimize) was run.	275		269		-2.2%
Optimizer successes ⓘ The number of traces that were successfully optimized.	275	100.0%	269	100.0%	-2.2%
Optimizer no memory ⓘ The number of optimizations that failed due to no memory.	0	0.0%	0	0.0%
Remove globals builtins changed ⓘ The builtins changed during optimization	0	0.0%	0	0.0%
Remove globals incorrect keys ⓘ The keys in the globals dictionary aren't what was expected	0	0.0%	0	0.0%

JIT memory stats

JIT memory stats

	Base Size (bytes)	Base Ratio	Head Size (bytes)	Head Ratio	Change
Padding size ⓘ The size of the memory allocated for the padding of the JIT traces	672,548	16.2%	649,053	16.0%	-3.5%
Data size ⓘ The size of the memory allocated for the data of the JIT traces	523,416	12.6%	510,104	12.6%	-2.5%
Total memory size ⓘ The total size of the memory allocated for the JIT traces	4,161,536		4,063,232		-2.4%
Code size ⓘ The size of the memory allocated for the code of the JIT traces	2,965,572	71.3%	2,904,075	71.5%	-2.1%
Trampoline size ⓘ The size of the memory allocated for the trampolines of the JIT traces	0	0.0%	0	0.0%
Freed memory size ⓘ The size of the memory freed from the JIT traces	0	0.0%	8,192	0.2%	8,192 / 0 !!

JIT trace total memory histogram

JIT trace total memory histogram

Size (bytes)	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 4,096	79	28.7%	77	28.5%	-2.5%
<= 8,192	66	24.0%	65	24.1%	-1.5%
<= 16,384	64	23.3%	63	23.3%	-1.6%
<= 32,768	44	16.0%	44	16.3%	0.0%
<= 65,536	22	8.0%	21	7.8%	-4.5%

Trace length histogram

trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 8	63	22.9%	62	23.0%	-1.6%
<= 16	16	5.8%	15	5.6%	-6.2%
<= 32	52	18.9%	52	19.3%	0.0%
<= 64	50	18.2%	49	18.2%	-2.0%
<= 128	59	21.5%	58	21.6%	-1.7%
<= 256	13	4.7%	12	4.5%	-7.7%
<= 512	22	8.0%	21	7.8%	-4.5%

Optimized trace length histogram

optimized trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 4	1	0.4%	1	0.4%	0.0%
<= 8	77	28.0%	75	27.9%	-2.6%
<= 16	1	0.4%	1	0.4%	0.0%
<= 32	101	36.7%	100	37.2%	-1.0%
<= 64	30	10.9%	28	10.4%	-6.7%
<= 128	30	10.9%	31	11.5%	3.3%
<= 256	35	12.7%	33	12.3%	-5.7%

Trace run length histogram

trace run length histogram

Uop execution stats

uop execution stats

Name	Base Count	Head Count	Change
_CALL_METHOD_DESCRIPTOR_NOARGS	74,499	98,371	32.0%
_CALL_LIST_APPEND	103,959	128,223	23.3%
_CALL_LEN	124,008	150,218	21.1%
_INIT_CALL_PY_EXACT_ARGS	124,008	150,218	21.1%
_LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES	382,446	451,788	18.1%
_LOAD_ATTR	1,699,025	2,005,371	18.0%
_CALL_BUILTIN_CLASS	545,292	643,544	18.0%
_CALL_BUILTIN_FAST	261,643	307,726	17.6%
_RETURN_VALUE	1,834,121	2,155,578	17.5%
_BINARY_SUBSCR_LIST_INT	281,600	329,633	17.1%
_ITER_NEXT_RANGE	281,600	329,633	17.1%
_TO_BOOL_BOOL	1,073,731	1,256,783	17.0%
_LOAD_ATTR_PROPERTY_FRAME	439,192	509,048	15.9%
_GUARD_NOT_EXHAUSTED_RANGE	439,206	509,062	15.9%
_ITER_CHECK_RANGE	439,206	509,062	15.9%
_BUILD_LIST	430,915	499,346	15.9%
_UNARY_INVERT	731,322	842,298	15.2%
_INIT_CALL_PY_EXACT_ARGS_0	1,469,566	1,683,877	14.6%
_CHECK_STACK_SPACE_OPERAND	2,250,527	2,576,097	14.5%
_PY_FRAME_GENERAL	597,813	684,135	14.4%
_GUARD_DORV_VALUES_INST_ATTR_FROM_DICT	3,329,553	3,806,539	14.3%
_GUARD_KEYS_VERSION	3,329,553	3,806,539	14.3%
_BINARY_OP_EXTEND	2,312,805	2,641,377	14.2%
_GUARD_BINARY_OP_EXTEND	2,476,371	2,827,001	14.2%
_RESUME_CHECK	4,316,248	4,925,086	14.1%
_COMPARE_OP_INT	798,657	909,469	13.9%
_LOAD_ATTR_METHOD_WITH_VALUES	2,947,107	3,354,751	13.8%
_LOAD_SMALL_INT_0	1,125,602	1,280,576	13.8%
_INIT_CALL_PY_EXACT_ARGS_1	1,601,549	1,821,092	13.7%
_DEOPT	163,623	185,625	13.4%
_TO_BOOL_INT	1,603,506	1,818,570	13.4%
_LOAD_CONST_INLINE_BORROW	6,488,575	7,351,337	13.3%
_SAVE_RETURN_OFFSET	5,163,126	5,841,820	13.1%
_GUARD_IS_FALSE_POP	2,252,579	2,546,354	13.0%
_CHECK_FUNCTION_VERSION	4,200,622	4,747,008	13.0%
_CHECK_FUNCTION_EXACT_ARGS	3,602,809	4,062,873	12.8%
_STORE_FAST_1	1,690,139	1,897,949	12.3%
_STORE_SUBSCR_DICT	174,436	195,254	11.9%
_COPY_FREE_VARS	523,312	585,764	11.9%
_LOAD_DEREF	523,312	585,764	11.9%
_CALL_ISINSTANCE	523,312	585,764	11.9%
_LOAD_SUPER_ATTR_METHOD	523,312	585,764	11.9%
_CHECK_FUNCTION_VERSION_INLINE	523,312	585,764	11.9%
_INIT_CALL_PY_EXACT_ARGS_3	523,312	585,764	11.9%
_LOAD_CONST_INLINE	2,877,860	3,205,679	11.4%
_CHECK_FUNCTION	4,861,566	5,410,598	11.3%
_LOAD_FAST_1	7,854,067	8,709,499	10.9%
_STORE_FAST_3	1,647,632	1,826,548	10.9%
_LOAD_FAST_0	10,663,425	11,792,137	10.6%
_LOAD_FAST_6	740,586	815,320	10.1%
_GUARD_IS_TRUE_POP	2,856,921	3,143,392	10.0%
_GUARD_NOS_INT	1,202,008	1,312,845	9.2%
_LOAD_FAST_3	3,412,887	3,727,493	9.2%
_CALL_METHOD_DESCRIPTOR_FAST	1,008,702	1,097,976	8.9%
_GUARD_IS_NOT_NONE_POP	2,097,635	2,275,941	8.5%
_PUSH_NULL	5,043,943	5,468,062	8.4%
_GUARD_TYPE_VERSION	7,371,394	7,987,563	8.4%
_STORE_FAST_6	586,238	634,368	8.2%
_STORE_FAST_7	586,238	634,368	8.2%
_STORE_FAST_4	1,926,223	2,080,452	8.0%
_LOAD_FAST_7	1,256,350	1,355,348	7.9%
_PUSH_FRAME	9,729,836	10,408,530	7.0%
_GET_ITER	1,370,285	1,464,936	6.9%
_CHECK_MANAGED_OBJECT_HAS_VALUES	6,605,944	7,045,942	6.7%
_LOAD_ATTR_INSTANCE_VALUE	6,605,944	7,045,942	6.7%
_POP_TOP	8,140,156	8,679,944	6.6%
_SET_IP	48,421,815	51,615,112	6.6%
_COPY	1,367,919	1,458,104	6.6%
_CHECK_VALIDITY	38,438,881	40,971,370	6.6%
_LOAD_FAST	2,874,112	3,055,641	6.3%
_SWAP	1,540,457	1,636,783	6.3%
_LOAD_FAST_4	2,909,543	3,084,924	6.0%
_LOAD_FAST_5	1,218,749	1,290,037	5.8%
_LOAD_ATTR_METHOD_NO_DICT	2,377,566	2,515,005	5.8%
_LOAD_FAST_2	9,547,637	10,075,872	5.5%
_CHECK_VALIDITY_AND_SET_IP	16,306,762	17,128,000	5.0%
_GUARD_DORV_NO_DICT	477,850	501,747	5.0%
_GUARD_TYPE_VERSION_AND_LOCK	477,850	501,747	5.0%
_STORE_ATTR_INSTANCE_VALUE	477,850	501,747	5.0%
_COMPARE_OP_STR	535,845	562,060	4.9%
_GUARD_BOTH_UNICODE	535,845	562,060	4.9%
_UNPACK_SEQUENCE_TWO_TUPLE	511,737	535,997	4.7%
_GUARD_IS_NONE_POP	515,775	540,044	4.7%
_TO_BOOL	515,856	540,116	4.7%
_JUMP_TO_TOP	578,669	605,272	4.6%
_GUARD_NOT_EXHAUSTED_LIST	6,778,883	7,089,068	4.6%
_ITER_CHECK_LIST	6,778,883	7,089,068	4.6%
_STORE_FAST_5	1,093,859	1,138,937	4.1%
_EXIT_TRACE	15,034,994	15,628,058	3.9%
_CONTAINS_OP_DICT	581,905	602,748	3.6%
_CHECK_PERIODIC	18,808,226	19,464,415	3.5%
_MAKE_WARM	21,190,874	21,908,159	3.4%
_START_EXECUTOR	20,612,205	21,297,127	3.3%
_CALL_NON_PY_GENERAL	2,688,299	2,775,341	3.2%
_CHECK_IS_NOT_PY_CALLABLE	2,688,299	2,775,341	3.2%
_STORE_FAST_2	5,262,961	5,379,454	2.2%
_ITER_NEXT_LIST	4,932,050	5,040,589	2.2%
_BUILD_TUPLE	1,327,017	1,351,281	1.8%
_TIER2_RESUME_CHECK	5,702,612	5,801,383	1.7%
_DYNAMIC_EXIT	5,413,588	5,483,444	1.3%
_STORE_FAST	2,534,481	2,558,745	1.0%
_BINARY_OP_ADD_INT	403,351	403,376	0.0%
_CALL_METHOD_DESCRIPTOR_O	403,351	403,376	0.0%
_LOAD_SMALL_INT_1	403,351	403,376	0.0%
_FOR_ITER_TIER_TWO	824,634	824,639	0.0%
_FOR_ITER_GEN_FRAME	4,566,710	4,566,710	0.0%
_LOAD_SPECIAL	815,372	815,372	0.0%
_BUILD_MAP	811,253	811,253	0.0%
_UNPACK_SEQUENCE_TUPLE	811,253	811,253	0.0%
_CALL_TUPLE_1	411,805	411,805	0.0%
_BINARY_SUBSCR	407,686	407,686	0.0%
_CHECK_STACK_SPACE	407,686	407,686	0.0%
_INIT_CALL_PY_EXACT_ARGS_2	407,686	407,686	0.0%
_DICT_MERGE	403,567	403,567	0.0%
_LIST_APPEND	882	882	0.0%
_BINARY_SUBSCR_STR_INT	882	882	0.0%
_BINARY_OP_MULTIPLY_FLOAT	882	882	0.0%
_CALL_BUILTIN_O	882	882	0.0%
_GUARD_BOTH_FLOAT	882	882	0.0%

Pair counts

Pair counts for top 100 Non-JIT uop 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.

Unsupported opcodes

unsupported opcodes

Opcode	Base Count	Head Count	Change
CALL_FUNCTION_EX	107	107	0.0%

Optimizer errored out with opcode

Optimization stopped after encountering this opcode

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	42	42	0.0%

---

Stats gathered on: 2025-02-06