bm-20250206-azure-x86_64-brandtbucher-justin_compact_exits-3.14.0a4+-aa6e11c-pystats-bpe_tokeniser-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
CALL_LIST_APPEND	3,859,623	297,572	-92.3%
BINARY_OP_SUBTRACT_INT	1,891,343	173,612	-90.8%
CALL_LEN	1,989,966	272,235	-86.3%
POP_JUMP_IF_FALSE	2,614,176	360,842	-86.2%
COMPARE_OP	621,748	86,019	-86.2%
COPY	949,488	194,790	-79.5%
STORE_SUBSCR	474,885	97,431	-79.5%
BUILD_TUPLE	720,374	184,771	-74.4%
NOT_TAKEN	1,853,611	638,835	-65.5%
COMPARE_OP_INT	2,670,909	953,178	-64.3%
LOAD_ATTR_METHOD_NO_DICT	5,854,951	2,292,901	-60.8%
BINARY_OP_ADD_INT	4,917,486	2,325,369	-52.7%
BINARY_SUBSCR_LIST_INT	4,774,078	2,389,177	-50.0%
LOAD_GLOBAL_BUILTIN	4,515,169	2,539,432	-43.8%
ENTER_EXECUTOR	10,402,710	6,076,508	-41.6%
LOAD_FAST_LOAD_FAST	6,656,659	4,271,758	-35.8%
JUMP_BACKWARD_JIT	3,804,560	2,662,139	-30.0%
FOR_ITER_LIST	1,825,134	1,309,143	-28.3%
SWAP	3,139,968	2,385,270	-24.0%
STORE_FAST	13,539,616	10,451,142	-22.8%
LOAD_CONST_MORTAL	2,398,202	1,882,190	-21.5%
POP_ITER	3,058,090	2,493,337	-18.5%
FOR_ITER	3,050,586	2,620,485	-14.1%
CALL_NON_PY_GENERAL	1,947,323	1,689,317	-13.2%
GET_ITER	2,862,619	2,604,613	-9.0%
LOAD_FAST	148,510,803	136,156,809	-8.3%
BUILD_LIST	3,278,703	3,020,718	-7.9%
LOAD_SMALL_INT	125,512,813	120,944,982	-3.6%
BINARY_SUBSCR	118,460,288	117,566,696	-0.8%
LOAD_DEREF	116,755,328	116,377,979	-0.3%
CALL_METHOD_DESCRIPTOR_FAST	1,056,259	1,056,260	0.0%
BINARY_SUBSCR_TUPLE_INT	2,210,327	2,210,329	0.0%
UNPACK_SEQUENCE_TWO_TUPLE	1,121,748	1,121,749	0.0%
STORE_FAST_STORE_FAST	1,121,865	1,121,866	0.0%
POP_JUMP_IF_NOT_NONE	3,369,161	3,369,162	0.0%
BINARY_OP	4,162,716	4,162,717	0.0%
RETURN_VALUE	232,879,830	232,879,830	0.0%
RESUME_CHECK	232,728,697	232,728,697	0.0%
INTERPRETER_EXIT	232,463,659	232,463,659	0.0%
COPY_FREE_VARS	116,280,384	116,280,384	0.0%
LOAD_CONST_IMMORTAL	3,292,496	3,292,496	0.0%
BINARY_SLICE	2,037,568	2,037,568	0.0%
LIST_APPEND	1,774,592	1,774,592	0.0%
POP_JUMP_IF_NONE	1,265,803	1,265,803	0.0%
LOAD_FAST_AND_CLEAR	938,240	938,240	0.0%
STORE_FAST_LOAD_FAST	778,140	778,140	0.0%
POP_JUMP_IF_TRUE	735,503	735,503	0.0%
NOP	577,319	577,319	0.0%
CALL_BUILTIN_CLASS	576,188	576,188	0.0%
CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	524,604	524,604	0.0%
BINARY_SUBSCR_DICT	514,446	514,446	0.0%
POP_TOP	513,609	513,609	0.0%
CALL_METHOD_DESCRIPTOR_O	413,950	413,950	0.0%
JUMP_FORWARD	413,695	413,695	0.0%
LOAD_GLOBAL_MODULE	314,723	314,723	0.0%
LOAD_ATTR_INSTANCE_VALUE	263,605	263,605	0.0%
CALL_PY_EXACT_ARGS	263,337	263,337	0.0%
PUSH_NULL	100,404	100,404	0.0%
EXTENDED_ARG	98,667	98,667	0.0%
STORE_SUBSCR_DICT	65,537	65,537	0.0%
MAP_ADD	65,536	65,536	0.0%
LOAD_ATTR_MODULE	50,624	50,624	0.0%
LOAD_ATTR	50,537	50,537	0.0%
CALL_FUNCTION_EX	49,536	49,536	0.0%
TO_BOOL	49,391	49,391	0.0%
CALL_KW_NON_PY	49,342	49,342	0.0%
BUILD_MAP	49,282	49,282	0.0%
MAKE_FUNCTION	49,280	49,280	0.0%
SET_FUNCTION_ATTRIBUTE	49,280	49,280	0.0%
STORE_DEREF	49,216	49,216	0.0%
DICT_MERGE	49,152	49,152	0.0%
LOAD_SUPER_ATTR_METHOD	49,151	49,151	0.0%
FOR_ITER_RANGE	16,722	16,722	0.0%
TO_BOOL_STR	2,765	2,765	0.0%
COMPARE_OP_STR	2,314	2,314	0.0%
TO_BOOL_BOOL	1,386	1,386	0.0%
CALL_ISINSTANCE	983	983	0.0%
STORE_ATTR_SLOT	956	956	0.0%
LOAD_ATTR_SLOT	900	900	0.0%
FOR_ITER_TUPLE	835	835	0.0%
LOAD_ATTR_CLASS	833	833	0.0%
CALL	797	797	0.0%
IS_OP	750	750	0.0%
STORE_ATTR_INSTANCE_VALUE	677	677	0.0%
CALL_BUILTIN_FAST_WITH_KEYWORDS	643	643	0.0%
LOAD_ATTR_PROPERTY	574	574	0.0%
LOAD_ATTR_METHOD_WITH_VALUES	480	480	0.0%
LOAD_GLOBAL	412	412	0.0%
BINARY_OP_ADD_UNICODE	385	385	0.0%
CALL_PY_GENERAL	380	380	0.0%
CALL_BOUND_METHOD_EXACT_ARGS	368	368	0.0%
CALL_TYPE_1	322	322	0.0%
YIELD_VALUE	320	320	0.0%
LOAD_ATTR_NONDESCRIPTOR_NO_DICT	320	320	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	262	262	0.0%
UNPACK_SEQUENCE_TUPLE	257	257	0.0%
CALL_BUILTIN_O	235	235	0.0%
CHECK_EXC_MATCH	195	195	0.0%
POP_EXCEPT	195	195	0.0%
PUSH_EXC_INFO	195	195	0.0%
MAKE_CELL	192	192	0.0%
STORE_ATTR	183	183	0.0%
TO_BOOL_LIST	164	164	0.0%
TO_BOOL_NONE	147	147	0.0%
BINARY_OP_INPLACE_ADD_UNICODE	134	134	0.0%
JUMP_BACKWARD_NO_JIT	132	132	0.0%
TO_BOOL_INT	131	131	0.0%
LOAD_SPECIAL	128	128	0.0%
CALL_KW_PY	126	126	0.0%
BINARY_SUBSCR_STR_INT	118	118	0.0%
CONTAINS_OP_SET	116	116	0.0%
CALL_KW	113	113	0.0%
CONTAINS_OP	94	94	0.0%
BINARY_SUBSCR_GETITEM	83	83	0.0%
BINARY_OP_EXTEND	82	82	0.0%
CALL_BUILTIN_FAST	66	66	0.0%
LOAD_FAST_CHECK	65	65	0.0%
RETURN_GENERATOR	64	64	0.0%
CALL_INTRINSIC_1	64	64	0.0%
LIST_EXTEND	64	64	0.0%
CALL_STR_1	64	64	0.0%
BINARY_OP_SUBTRACT_FLOAT	63	63	0.0%
LOAD_CONST	52	52	0.0%
STORE_SUBSCR_LIST_INT	40	40	0.0%
UNPACK_SEQUENCE	26	26	0.0%
RESUME	26	26	0.0%
UNARY_NOT	25	25	0.0%
EXIT_INIT_CHECK	24	24	0.0%
CALL_ALLOC_AND_ENTER_INIT	24	24	0.0%
JUMP_BACKWARD	23	23	0.0%
BINARY_OP_MULTIPLY_INT	11	11	0.0%
CONTAINS_OP_DICT	10	10	0.0%
LOAD_ATTR_CLASS_WITH_METACLASS_CHECK	3	3	0.0%
LOAD_SUPER_ATTR	2	2	0.0%
CALL_TUPLE_1	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
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	4,161,533	0.2%	4,161,534	0.2%	0.0%
hit ⓘ Specialized instructions that complete.	2,050,544,501	99.8%	2,050,544,501	99.8%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	30	2.5%	30	2.5%	0.0%
Failure	1,153	97.5%	1,153	97.5%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
add other	1,111	96.4%	1,111	96.4%	0.0%
true divide different types	42	3.6%	42	3.6%	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.	2,037,568	100.0%	2,037,568	100.0%	0.0%

BINARY_SUBSCR

specialization stats for BINARY_SUBSCR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	118,431,269	7.9%	117,537,908	7.8%	-0.8%
hit ⓘ Specialized instructions that complete.	1,388,646,210	92.1%	1,388,646,210	92.2%	0.0%
miss ⓘ Specialized instructions that deopt.	23	0.0%	23	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	28,965	99.8%	28,734	99.8%	-0.8%
Success	55	0.2%	55	0.2%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
list slice	445	1.5%	319	1.1%	-28.3%
other	28,520	98.5%	28,415	98.9%	-0.4%

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.	125	0.0%	125	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	1,984,339,707	100.0%	1,984,339,707	100.0%	0.0%
miss ⓘ Specialized instructions that deopt.	66	0.0%	66	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	738	100.0%	738	100.0%	0.0%
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.	6	5.3%	6	5.3%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	107	100.0%	107	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.	621,542	0.1%	85,939	0.0%	-86.2%
hit ⓘ Specialized instructions that complete.	989,880,949	99.9%	989,880,949	100.0%	0.0%
miss ⓘ Specialized instructions that deopt.	2	0.0%	2	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	161	77.8%	35	43.2%	-78.3%
Success	46	22.2%	46	56.8%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
tuple	159	98.8%	33	94.3%	-79.2%
different types	2	1.2%	2	5.7%	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.	93	42.3%	93	42.3%	0.0%
hit ⓘ Specialized instructions that complete.	126	57.3%	126	57.3%	0.0%

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

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
str	1	100.0%	1	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.	1,842,691	37.7%	1,326,700	33.6%	-28.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	3,049,781	62.3%	2,619,785	66.4%	-14.1%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	797	99.0%	692	98.9%	-13.2%
Success	8	1.0%	8	1.1%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
zip	138	17.3%	33	4.8%	-76.1%
enumerate	330	41.4%	330	47.7%	0.0%
bytes	276	34.6%	276	39.9%	0.0%
dict items	51	6.4%	51	7.4%	0.0%
dict values	1	0.1%	1	0.1%	0.0%
seq iter	1	0.1%	1	0.1%	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.	49,797	0.0%	49,797	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	994,487,899	100.0%	994,487,899	100.0%	0.0%
miss ⓘ Specialized instructions that deopt.	193	0.0%	193	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	604	81.6%	604	81.6%	0.0%
Failure	136	18.4%	136	18.4%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
method	51	37.5%	51	37.5%	0.0%
non overriding descriptor	21	15.4%	21	15.4%	0.0%
not managed dict	21	15.4%	21	15.4%	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.	4,829,880	100.0%	2,854,143	100.0%	-40.9%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	33	0.0%	33	0.0%	0.0%
deopt ⓘ Specialized instructions that deopt.	1	0.0%	1	0.0%	0.0%
miss ⓘ Specialized instructions that deopt.	12	0.0%	12	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	379	100.0%	379	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
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	1	0.0%	1	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	49,151	100.0%	49,151	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	1	100.0%	1	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
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	15	0.8%	15	0.8%	0.0%
hit ⓘ Specialized instructions that complete.	1,633	89.9%	1,633	89.9%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	168	100.0%	168	100.0%	0.0%
Failure	0	0.0%	0	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.	474,746	87.8%	97,397	59.7%	-79.5%
hit ⓘ Specialized instructions that complete.	65,577	12.1%	65,577	40.2%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Failure	137	98.6%	32	94.1%	-76.6%
Success	2	1.4%	2	5.9%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
other	137	100.0%	32	100.0%	-76.6%

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.	49,255	91.2%	49,255	91.2%	0.0%
hit ⓘ Specialized instructions that complete.	4,582	8.5%	4,582	8.5%	0.0%
miss ⓘ Specialized instructions that deopt.	11	0.0%	11	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	64	47.1%	64	47.1%	0.0%
Failure	72	52.9%	72	52.9%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
dict	50	69.4%	50	69.4%	0.0%
sequence	21	29.2%	21	29.2%	0.0%
mapping	1	1.4%	1	1.4%	0.0%

UNPACK_SEQUENCE

specialization stats for UNPACK_SEQUENCE family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	3	0.0%	3	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	5,338,794	100.0%	5,338,794	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	23	100.0%	23	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
Specialized hits ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that complete.	283,977,583	19.6%	262,315,108	18.9%	-7.6%
Basic ⓘ Instructions that are not and cannot be specialized, e.g. LOAD_FAST.	1,033,529,493	71.5%	999,836,891	72.0%	-3.3%
Not specialized ⓘ Instructions that could be specialized but aren't, e.g. LOAD_ATTR, BINARY_SLICE.	128,909,346	8.9%	126,672,471	9.1%	-1.7%
Specialized misses ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that deopt.	307	0.0%	307	0.0%	0.0%

Deferred by instruction

Breakdown of deferred (not specialized) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
COMPARE_OP	621,542	0.5%	85,939	0.1%	-86.2%
STORE_SUBSCR	474,746	0.4%	97,397	0.1%	-79.5%
FOR_ITER	3,049,781	2.4%	2,619,785	2.1%	-14.1%
BINARY_SUBSCR	118,431,269	91.9%	117,537,908	92.8%	-0.8%
BINARY_OP	4,161,533	3.2%	4,161,534	3.3%	0.0%
BINARY_SLICE	2,037,568	1.6%	2,037,568	1.6%	0.0%
LOAD_ATTR	49,797	0.0%	49,797	0.0%	0.0%
TO_BOOL	49,255	0.0%	49,255	0.0%	0.0%
CALL	125	0.0%	125	0.0%	0.0%
CONTAINS_OP	93	0.0%	93	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
LOAD_ATTR_SLOT	192	62.5%	192	62.5%	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	63	20.5%	63	20.5%	0.0%
BINARY_SUBSCR_LIST_INT	22	7.2%	22	7.2%	0.0%
TO_BOOL_NONE	7	2.3%	7	2.3%	0.0%
LOAD_GLOBAL_BUILTIN	6	2.0%	6	2.0%	0.0%
LOAD_GLOBAL_MODULE	6	2.0%	6	2.0%	0.0%
TO_BOOL_LIST	3	1.0%	3	1.0%	0.0%
CALL_BUILTIN_FAST	2	0.7%	2	0.7%	0.0%
COMPARE_OP_STR	2	0.7%	2	0.7%	0.0%
CALL_PY_EXACT_ARGS	1	0.3%	1	0.3%	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	232,463,744	99.8%	232,463,744	99.8%	0.0%
Calls to Python functions inlined	416,467	0.2%	416,467	0.2%	0.0%
Calls via PyEval_EvalFrame (total)	232,463,744	99.8%	232,463,744	99.8%	0.0%
Calls via PyEval_EvalFrame (vector)	232,463,360	99.8%	232,463,360	99.8%	0.0%
Calls via PyEval_EvalFrame (generator)	384	0.0%	384	0.0%	0.0%
Calls via PyEval_EvalFrame (legacy)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (function vectorcall)	232,463,360	99.8%	232,463,360	99.8%	0.0%
Calls via PyEval_EvalFrame (build class)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (slot)	312	0.0%	312	0.0%	0.0%
Calls via PyEval_EvalFrame (function ex)	128	0.0%	128	0.0%	0.0%
Calls via PyEval_EvalFrame (api)	116,182,022	49.9%	116,182,022	49.9%	0.0%
Calls via PyEval_EvalFrame (method)	0	0.0%	0	0.0%
Frame objects created	237	0.0%	237	0.0%	0.0%
Frames pushed	232,879,851	100.0%	232,879,851	100.0%	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
Interpreter immortal decrefs	41,504,643	0.1%	23,999,363	0.1%	-42.2%
Interpreter immortal increfs	25,203,092	0.1%	16,799,538	0.1%	-33.3%
Method cache dunder misses	46		53		15.2%
Method cache collisions	353		387		9.6%
Mortal increfs	17,775,289,538	67.6%	16,248,296,714	65.7%	-8.6%
Mortal decrefs	22,103,628,081	58.9%	20,576,901,916	57.2%	-6.9%
Interpreter mortal increfs	1,220,018,479	4.6%	1,196,885,805	4.8%	-1.9%
Interpreter mortal decrefs	1,239,048,419	3.3%	1,215,632,366	3.4%	-1.9%
Method cache misses	362		368		1.7%
Allocations to 4 kbytes	149,846	0.0%	149,241	0.0%	-0.4%
Immortal increfs	7,267,034,126	27.6%	7,275,177,775	29.4%	0.1%
Immortal decrefs	14,130,492,973	37.7%	14,143,670,774	39.3%	0.1%
Allocations over 4 kbytes	242,944	0.0%	243,139	0.0%	0.1%
Method cache hits	53,847		53,841		-0.0%
Allocations from freelist	3,680,410,388	79.3%	3,680,394,495	79.3%	-0.0%
Frees to freelist	3,680,412,457		3,680,396,564		-0.0%
Frees	1,278,971,673		1,278,970,765		-0.0%
Allocations	959,333,863	20.7%	959,333,325	20.7%	-0.0%
Method cache dunder hits	944,047,369		944,047,152		-0.0%
Allocations to 512 bytes	958,941,073	20.7%	958,940,945	20.7%	-0.0%
Inline values	49,304		49,304		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	147,649	377	2,038,141,962	130,707,887	237,387,692	147,649	377	2,038,547,633	130,826,910	237,350,195
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
Traces executed ⓘ The number of traces that were executed	1,556,232,102		10,435,697		-99.3%
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.	2,133		1,289		-39.6%
Traces created ⓘ The number of traces that were successfully created.	2,133	100.0%	1,289	100.0%	-39.6%
Uops executed ⓘ The total number of uops (micro-operations) that were executed	59,711,792,623	3,836.9%	57,629,972,526	552,238.8%	-3.5%
Trace stack overflow ⓘ A trace is truncated because it would require more than 5 stack frames.	0	0.0%	0	0.0%
Trace stack underflow ⓘ A potential trace is abandoned because it pops more frames than it pushes.	0	0.0%	0	0.0%
Trace too long ⓘ A trace is truncated because it is longer than the instruction buffer.	0	0.0%	0	0.0%
Trace too short ⓘ A potential trace is abandoned because it it too short.	0	0.0%	0	0.0%
Inner loop found ⓘ A trace is truncated because it has an inner loop	0	0.0%	0	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.	64	3.0%	64	5.0%	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.	2,133		1,289		-39.6%
Optimizer successes ⓘ The number of traces that were successfully optimized.	2,133	100.0%	1,289	100.0%	-39.6%
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	5,168,560	22.3%	3,881,847	15.3%	-24.9%
Data size ⓘ The size of the memory allocated for the data of the JIT traces	2,724,128	11.8%	3,341,904	13.1%	22.7%
Code size ⓘ The size of the memory allocated for the code of the JIT traces	15,262,000	65.9%	18,228,793	71.6%	19.4%
Total memory size ⓘ The total size of the memory allocated for the JIT traces	23,154,688		25,452,544		9.9%
Freed memory size ⓘ The size of the memory freed from the JIT traces	22,974,464	99.2%	23,855,104	93.7%	3.8%
Trampoline size ⓘ The size of the memory allocated for the trampolines of the JIT traces	0	0.0%	0	0.0%

JIT trace total memory histogram

JIT trace total memory histogram

Size (bytes)	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 4,096	405	19.0%	277	17.4%	-31.6%
<= 8,192	768	36.0%	495	31.0%	-35.5%
<= 16,384	704	33.0%	389	24.4%	-44.7%
<= 32,768	256	12.0%	326	20.4%	27.3%
<= 65,536			45	2.8%
<= 131,072			63	3.9%

Trace length histogram

trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 8	256	12.0%	128	9.9%	-50.0%
<= 16	128	6.0%	128	9.9%	0.0%
<= 32	661	31.0%	386	29.9%	-41.6%
<= 64	704	33.0%	452	35.1%	-35.8%
<= 128	384	18.0%	195	15.1%	-49.2%

Optimized trace length histogram

optimized trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 4	256	12.0%	128	9.9%	-50.0%
<= 8	0	0.0%	0	0.0%
<= 16	512	24.0%	258	20.0%	-49.6%
<= 32	405	19.0%	321	24.9%	-20.7%
<= 64	704	33.0%	389	30.2%	-44.7%
<= 128	256	12.0%	193	15.0%	-24.6%

Trace run length histogram

trace run length histogram

Uop execution stats

uop execution stats

Name	Base Count	Head Count	Change
_LOAD_SMALL_INT_2	462,691	1,633,784	253.1%
_JUMP_TO_TOP	429,443,393	1,343,036,252	212.7%
_EXIT_TRACE	1,556,232,102	10,435,695	-99.3%
_START_EXECUTOR	1,556,232,102	10,435,697	-99.3%
_CALL_LIST_APPEND	983,644,869	987,206,920	0.4%
_LOAD_ATTR_METHOD_NO_DICT	988,164,378	991,726,428	0.4%
_GUARD_TYPE_VERSION	988,315,802	991,877,852	0.4%
_STORE_FAST_4	670,187,788	672,124,938	0.3%
_LOAD_FAST	2,646,102,858	2,653,342,228	0.3%
_GUARD_IS_FALSE_POP	353,828,400	354,789,186	0.3%
_BINARY_OP_ADD_INT	1,057,571,941	1,060,164,058	0.2%
_GUARD_NOS_INT	2,008,899,524	2,013,625,443	0.2%
_LOAD_FAST_4	2,711,059,223	2,716,841,020	0.2%
_MAKE_WARM	1,985,675,495	1,989,783,826	0.2%
_POP_TOP	317,553,451	318,118,204	0.2%
_CALL_LEN	986,163,056	987,880,787	0.2%
_BINARY_OP_SUBTRACT_INT	986,163,056	987,880,787	0.2%
_COMPARE_OP_INT	987,207,728	988,925,459	0.2%
_LOAD_FAST_5	2,361,103,923	2,365,206,555	0.2%
_BINARY_SUBSCR_LIST_INT	1,372,565,827	1,374,950,728	0.2%
_SET_IP	7,369,268,541	7,381,279,091	0.2%
_LOAD_SMALL_INT_1	2,047,489,095	2,050,627,849	0.2%
_BUILD_TUPLE	352,388,993	352,924,596	0.2%
_COMPARE_OP	352,388,993	352,924,596	0.2%
_CHECK_FUNCTION	1,307,749,231	1,309,724,968	0.2%
_PUSH_NULL	1,308,922,883	1,310,898,620	0.2%
_CHECK_VALIDITY	6,025,642,276	6,034,466,402	0.1%
_LOAD_CONST_INLINE	1,623,385,838	1,625,619,581	0.1%
_GUARD_IS_TRUE_POP	985,768,321	987,060,869	0.1%
_CHECK_VALIDITY_AND_SET_IP	2,708,971,814	2,711,986,212	0.1%
_COPY	706,642,816	707,397,514	0.1%
_LOAD_DEREF	353,321,408	353,698,757	0.1%
_STORE_SUBSCR	353,321,408	353,698,757	0.1%
_SWAP	707,347,712	708,102,410	0.1%
_BINARY_SUBSCR	990,090,046	990,983,407	0.1%
_STORE_FAST	992,107,327	993,000,666	0.1%
_CHECK_PERIODIC	1,677,401,533	1,678,801,665	0.1%
_ITER_NEXT_LIST	634,871,850	635,387,841	0.1%
_GUARD_NOT_EXHAUSTED_LIST	635,222,186	635,738,177	0.1%
_ITER_CHECK_LIST	635,222,186	635,738,177	0.1%
_GET_ITER	318,989,759	319,247,765	0.1%
_STORE_FAST_5	319,112,296	319,370,281	0.1%
_BUILD_LIST	320,881,215	321,139,200	0.1%
_CALL_NON_PY_GENERAL	321,434,751	321,692,757	0.1%
_CHECK_IS_NOT_PY_CALLABLE	321,434,751	321,692,757	0.1%
_LOAD_SMALL_INT_0	321,427,476	321,685,460	0.1%
_LOAD_CONST_INLINE_BORROW	325,590,459	325,848,465	0.1%
_FOR_ITER_TIER_TWO	680,178,388	680,608,384	0.1%
_GUARD_IS_NOT_NONE_POP	3,472,917	3,472,916	-0.0%
_BINARY_SUBSCR_TUPLE_INT	8,433,578	8,433,576	-0.0%
_LOAD_FAST_7	8,433,578	8,433,576	-0.0%
_UNPACK_SEQUENCE_TWO_TUPLE	4,216,789	4,216,788	-0.0%
_CALL_METHOD_DESCRIPTOR_FAST	4,216,789	4,216,788	-0.0%
_STORE_FAST_7	4,216,789	4,216,788	-0.0%
_LOAD_FAST_0	4,515,989	4,515,988	-0.0%
_BINARY_OP	5,168,917	5,168,916	-0.0%
_STORE_FAST_6	5,841,109	5,841,108	-0.0%
_LOAD_FAST_3	3,616,808	3,616,808	0.0%
_LIST_APPEND	3,297,664	3,297,664	0.0%
_GUARD_IS_NONE_POP	2,723,648	2,723,648	0.0%
_LOAD_FAST_6	1,950,101	1,950,101	0.0%
_STORE_FAST_2	1,625,152	1,625,152	0.0%
_LOAD_FAST_2	1,525,568	1,525,568	0.0%
_CALL_BUILTIN_CLASS	1,173,652	1,173,652	0.0%
_GUARD_BOTH_INT	1,044,672	1,044,672	0.0%
_BINARY_SLICE	634,752	634,752	0.0%
_STORE_FAST_3	416,960	416,960	0.0%
_LOAD_FAST_AND_CLEAR	302,720	302,720	0.0%
_CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	302,720	302,720	0.0%
_RESUME_CHECK	151,424	151,424	0.0%
_CHECK_FUNCTION_VERSION_INLINE	151,424	151,424	0.0%
_CHECK_MANAGED_OBJECT_HAS_VALUES	151,424	151,424	0.0%
_CHECK_STACK_SPACE_OPERAND	151,424	151,424	0.0%
_INIT_CALL_PY_EXACT_ARGS_2	151,424	151,424	0.0%
_LOAD_ATTR_INSTANCE_VALUE	151,424	151,424	0.0%
_LOAD_FAST_1	151,424	151,424	0.0%
_PUSH_FRAME	151,424	151,424	0.0%
_SAVE_RETURN_OFFSET	151,424	151,424	0.0%
_BINARY_SUBSCR_DICT	147,776	147,776	0.0%
_DEOPT		2

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

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	21	21	0.0%

---

Stats gathered on: 2025-02-06