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
JUMP_BACKWARD	271,618	6	-100.0%
LOAD_FAST	253,705,799	253,705,799	0.0%
LOAD_CONST_IMMORTAL	87,138,685	87,138,685	0.0%
RETURN_VALUE	83,021,569	83,021,569	0.0%
LOAD_ATTR_INSTANCE_VALUE	77,000,124	77,000,124	0.0%
RESUME_CHECK	67,747,103	67,747,103	0.0%
POP_JUMP_IF_FALSE	61,918,541	61,918,541	0.0%
POP_TOP	61,397,790	61,397,790	0.0%
LOAD_FAST_LOAD_FAST	58,126,706	58,126,706	0.0%
STORE_ATTR_SLOT	54,345,651	54,345,651	0.0%
LOAD_METHOD_WITH_VALUES	47,216,386	47,216,386	0.0%
TO_BOOL_BOOL	42,591,200	42,591,200	0.0%
STORE_FAST	36,590,278	36,590,278	0.0%
CALL_PY_EXACT_ARGS	31,726,376	31,726,376	0.0%
LOAD_ATTR_SLOT	23,312,666	23,312,666	0.0%
INTERPRETER_EXIT	19,707,913	19,707,913	0.0%
TO_BOOL_NONE	19,110,205	19,110,205	0.0%
POP_JUMP_IF_NOT_NONE	16,407,869	16,407,869	0.0%
LOAD_METHOD_NO_DICT	14,943,450	14,943,450	0.0%
CALL_METHOD_DESCRIPTOR_O	14,929,915	14,929,915	0.0%
PUSH_NULL	14,722,764	14,722,764	0.0%
LOAD_GLOBAL_MODULE	14,110,664	14,110,664	0.0%
LOAD_ATTR_MODULE	12,912,423	12,912,423	0.0%
ENTER_EXECUTOR	11,673,493	11,673,493	0.0%
CALL_FUNCTION_EX	11,346,880	11,346,880	0.0%
STORE_ATTR_INSTANCE_VALUE	11,034,043	11,034,043	0.0%
POP_JUMP_IF_NONE	8,540,144	8,540,144	0.0%
CALL_NON_PY_GENERAL	8,363,871	8,363,871	0.0%
EXIT_INIT_CHECK	8,360,891	8,360,891	0.0%
CALL_ALLOC_AND_ENTER_INIT	8,360,891	8,360,891	0.0%
NOP	8,143,935	8,143,935	0.0%
LOAD_ATTR	7,773,747	7,773,747	0.0%
POP_JUMP_IF_TRUE	7,768,193	7,768,193	0.0%
RETURN_GENERATOR	7,466,742	7,466,742	0.0%
DELETE_FAST	7,166,272	7,166,272	0.0%
END_SEND	5,374,848	5,374,848	0.0%
SEND_GEN	5,078,064	5,078,064	0.0%
GET_AWAITABLE	4,480,758	4,480,758	0.0%
LOAD_SMALL_INT	4,260,689	4,260,689	0.0%
TO_BOOL	4,220,176	4,220,176	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	4,186,666	4,186,666	0.0%
LOAD_CONST_MORTAL	3,952,193	3,952,193	0.0%
COMPARE_OP_INT	3,586,170	3,586,170	0.0%
JUMP_FORWARD	3,586,113	3,586,113	0.0%
BUILD_TUPLE	3,583,808	3,583,808	0.0%
CALL_PY_GENERAL	3,583,671	3,583,671	0.0%
BUILD_MAP	3,583,488	3,583,488	0.0%
CALL_KW_PY	3,583,293	3,583,293	0.0%
DICT_MERGE	3,583,232	3,583,232	0.0%
JUMP_BACKWARD_NO_INTERRUPT	1,791,680	1,791,680	0.0%
YIELD_VALUE	1,791,680	1,791,680	0.0%
LOAD_GLOBAL_BUILTIN	1,202,023	1,202,023	0.0%
CALL_BUILTIN_CLASS	1,196,217	1,196,217	0.0%
SEND	1,194,688	1,194,688	0.0%
SWAP	1,194,629	1,194,629	0.0%
LOAD_SPECIAL	1,194,372	1,194,372	0.0%
FOR_ITER_RANGE	692,647	692,647	0.0%
BINARY_OP_SUBTRACT_INT	672,332	672,332	0.0%
BUILD_LIST	603,898	603,898	0.0%
GET_ITER	601,217	601,217	0.0%
COPY	599,043	599,043	0.0%
CALL_BUILTIN_FAST_WITH_KEYWORDS	597,309	597,309	0.0%
CALL_KW_NON_PY	367,949	367,949	0.0%
TO_BOOL_LIST	178,642	178,642	0.0%
POP_ITER	109,191	109,191	0.0%
CALL_INTRINSIC_1	5,370	5,370	0.0%
LIST_EXTEND	5,370	5,370	0.0%
CALL_LEN	3,837	3,837	0.0%
CALL	2,893	2,893	0.0%
FOR_ITER_LIST	2,621	2,621	0.0%
LOAD_METHOD	2,371	2,371	0.0%
TO_BOOL_INT	1,658	1,658	0.0%
LOAD_GLOBAL	1,637	1,637	0.0%
CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	1,469	1,469	0.0%
STORE_ATTR	1,352	1,352	0.0%
BINARY_OP_ADD_FLOAT	1,279	1,279	0.0%
LOAD_DEREF	768	768	0.0%
COPY_FREE_VARS	704	704	0.0%
BINARY_OP	580	580	0.0%
LOAD_SUPER_METHOD_METHOD	504	504	0.0%
COMPARE_OP	485	485	0.0%
CALL_ISINSTANCE	446	446	0.0%
IS_OP	384	384	0.0%
BINARY_SUBSCR	348	348	0.0%
BINARY_SUBSCR_TUPLE_INT	318	318	0.0%
FOR_ITER	267	267	0.0%
FORMAT_SIMPLE	256	256	0.0%
MAKE_FUNCTION	256	256	0.0%
SET_FUNCTION_ATTRIBUTE	256	256	0.0%
CALL_BUILTIN_FAST	255	255	0.0%
UNPACK_SEQUENCE_TWO_TUPLE	252	252	0.0%
STORE_FAST_STORE_FAST	192	192	0.0%
CALL_METHOD_DESCRIPTOR_FAST	190	190	0.0%
LOAD_CONST	182	182	0.0%
LOAD_SUPER_METHOD	176	176	0.0%
CHECK_EXC_MATCH	129	129	0.0%
POP_EXCEPT	129	129	0.0%
PUSH_EXC_INFO	129	129	0.0%
UNARY_INVERT	128	128	0.0%
UNARY_NOT	128	128	0.0%
BUILD_STRING	128	128	0.0%
MAKE_CELL	128	128	0.0%
BINARY_SUBSCR_DICT	127	127	0.0%
CALL_BUILTIN_O	126	126	0.0%
RESUME	93	93	0.0%
UNPACK_SEQUENCE	88	88	0.0%
IMPORT_NAME	65	65	0.0%
RAISE_VARARGS	64	64	0.0%
RERAISE	64	64	0.0%
STORE_DEREF	64	64	0.0%
BINARY_SUBSCR_GETITEM	64	64	0.0%
BINARY_OP_ADD_INT	63	63	0.0%
BINARY_OP_SUBTRACT_FLOAT	63	63	0.0%
CALL_BOUND_METHOD_EXACT_ARGS	63	63	0.0%
CALL_BOUND_METHOD_GENERAL	63	63	0.0%
CALL_TYPE_1	63	63	0.0%
CONTAINS_OP_DICT	63	63	0.0%
CONTAINS_OP_SET	63	63	0.0%
LOAD_ATTR_NONDESCRIPTOR_WITH_VALUES	63	63	0.0%
STORE_SUBSCR_DICT	63	63	0.0%
CALL_KW	54	54	0.0%
CONTAINS_OP	44	44	0.0%
STORE_SUBSCR	23	23	0.0%
FOR_ITER_TUPLE	2	2	0.0%
IMPORT_FROM	1	1	0.0%
LOAD_FAST_CHECK	1	1	0.0%
STORE_FAST_LOAD_FAST	1	1	0.0%
STORE_GLOBAL	1	1	0.0%
COMPARE_OP_STR	1	1	0.0%
TO_BOOL_ALWAYS_TRUE	1	1	0.0%
JUMP_BACKWARD_JIT		271,618

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.	389	0.0%	389	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	3,584,571	100.0%	3,584,571	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	65	34.0%	65	34.0%	0.0%
Failure	126	66.0%	126	66.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
and int	84	66.7%	84	66.7%	0.0%
or	42	33.3%	42	33.3%	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.	260	30.3%	260	30.3%	0.0%
hit ⓘ Specialized instructions that complete.	509	59.4%	509	59.4%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	44	50.0%	44	50.0%	0.0%
Failure	44	50.0%	44	50.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
other	44	100.0%	44	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.	190	0.0%	190	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	80,640,256	100.0%	80,640,256	100.0%	0.0%
miss ⓘ Specialized instructions that deopt.	379	0.0%	379	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	2,703	100.0%	2,703	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	21	21 / 0 !!	21	21 / 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.	7	13.0%	7	13.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	47	100.0%	47	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.	393	0.0%	393	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	3,586,171	100.0%	3,586,171	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	26	28.3%	26	28.3%	0.0%
Failure	66	71.7%	66	71.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
tuple	44	66.7%	44	66.7%	0.0%
bool	22	33.3%	22	33.3%	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.	2	1.2%	2	1.2%	0.0%
hit ⓘ Specialized instructions that complete.	126	74.1%	126	74.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	42	100.0%	42	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.	197	0.0%	197	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	695,270	100.0%	695,270	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	25	35.7%	25	35.7%	0.0%
Failure	45	64.3%	45	64.3%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
dict items	44	97.8%	44	97.8%	0.0%
dict values	1	2.2%	1	2.2%	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.	7,769,871	3.0%	7,769,871	3.0%	0.0%
hit ⓘ Specialized instructions that complete.	247,041,575	96.9%	247,041,575	96.9%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	1,643	42.6%	1,643	42.6%	0.0%
Failure	2,212	57.4%	2,212	57.4%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
method	1,022	46.2%	1,022	46.2%	0.0%
overriding descriptor	1,010	45.7%	1,010	45.7%	0.0%
module attr not found	159	7.2%	159	7.2%	0.0%
metaclass attribute	21	0.9%	21	0.9%	0.0%

LOAD_GLOBAL

specialization stats for LOAD_GLOBAL family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	112	0.0%	112	0.0%	0.0%
deopt ⓘ Specialized instructions that deopt.	64	0.0%	64	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	15,312,623	100.0%	15,312,623	100.0%	0.0%
miss ⓘ Specialized instructions that deopt.	64	0.0%	64	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	1,525	100.0%	1,525	100.0%	0.0%
Failure	0	0.0%	0	0.0%

LOAD_METHOD

specialization stats for LOAD_METHOD family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	803	33.9%	803	33.9%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	1,398	89.2%	1,398	89.2%	0.0%
Failure	170	10.8%	170	10.8%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
other	107	62.9%	107	62.9%	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.	504	100.0%	504	100.0%	0.0%

LOAD_SUPER_METHOD

specialization stats for LOAD_SUPER_METHOD family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	8	4.5%	8	4.5%	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%

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.	1,194,374	16.7%	1,194,374	16.7%	0.0%
hit ⓘ Specialized instructions that complete.	5,972,154	83.3%	5,972,154	83.3%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	6	1.9%	6	1.9%	0.0%
Failure	308	98.1%	308	98.1%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
other	308	100.0%	308	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.	270	0.0%	270	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	65,695,219	100.0%	65,695,219	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	1,039	96.0%	1,039	96.0%	0.0%
Failure	43	4.0%	43	4.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
overriding descriptor	21	48.8%	21	48.8%	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.	2	2.3%	2	2.3%	0.0%
hit ⓘ Specialized instructions that complete.	63	73.3%	63	73.3%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	21	100.0%	21	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.	4,218,336	5.1%	4,218,336	5.1%	0.0%
hit ⓘ Specialized instructions that complete.	78,240,203	94.9%	78,240,203	94.9%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	719	39.1%	719	39.1%	0.0%
Failure	1,121	60.9%	1,121	60.9%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
set	1,055	94.1%	1,055	94.1%	0.0%
sequence	66	5.9%	66	5.9%	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.	4	1.2%	4	1.2%	0.0%
hit ⓘ Specialized instructions that complete.	252	74.1%	252	74.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	84	100.0%	84	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.	563,729,031	43.7%	564,000,649	43.7%	0.0%
Basic ⓘ Instructions that are not and cannot be specialized, e.g. `LOAD_FAST`.	712,691,034	55.3%	712,419,422	55.2%	-0.0%
Not specialized ⓘ Instructions that could be specialized but aren't, e.g. `LOAD_ATTR`, `BINARY_SLICE`.	13,198,929	1.0%	13,198,929	1.0%	0.0%
Specialized misses ⓘ Specialized instructions, e.g. `LOAD_ATTR_MODULE` that deopt.	5,515	0.0%	5,515	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
LOAD_ATTR	7,769,871	58.9%	7,769,871	58.9%	0.0%
TO_BOOL	4,218,336	32.0%	4,218,336	32.0%	0.0%
SEND	1,194,374	9.1%	1,194,374	9.1%	0.0%
LOAD_METHOD	803	0.0%	803	0.0%	0.0%
COMPARE_OP	393	0.0%	393	0.0%	0.0%
BINARY_OP	389	0.0%	389	0.0%	0.0%
STORE_ATTR	270	0.0%	270	0.0%	0.0%
BINARY_SUBSCR	260	0.0%	260	0.0%	0.0%
FOR_ITER	197	0.0%	197	0.0%	0.0%
CALL	190	0.0%	190	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	5,072	47.9%	5,072	47.9%	0.0%
RESUME_CHECK	5,072	47.9%	5,072	47.9%	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	253	2.4%	253	2.4%	0.0%
CALL_METHOD_DESCRIPTOR_O	126	1.2%	126	1.2%	0.0%
LOAD_GLOBAL_BUILTIN	64	0.6%	64	0.6%	0.0%
CACHE	0	0.0%	0	0.0%
CALL_FUNCTION_EX	0	0.0%	0	0.0%
CHECK_EXC_MATCH	0	0.0%	0	0.0%
END_SEND	0	0.0%	0	0.0%
EXIT_INIT_CHECK	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	19,707,977	23.2%	19,707,977	23.2%	0.0%
Calls to Python functions inlined	65,105,277	76.8%	65,105,277	76.8%	0.0%
Calls via PyEval_EvalFrame (total)	19,707,977	23.2%	19,707,977	23.2%	0.0%
Calls via PyEval_EvalFrame (vector)	15,527,625	18.3%	15,527,625	18.3%	0.0%
Calls via PyEval_EvalFrame (generator)	4,180,352	4.9%	4,180,352	4.9%	0.0%
Calls via PyEval_EvalFrame (legacy)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (function vectorcall)	15,527,625	18.3%	15,527,625	18.3%	0.0%
Calls via PyEval_EvalFrame (build class)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (slot)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (function ex)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (api)	67	0.0%	67	0.0%	0.0%
Calls via PyEval_EvalFrame (method)	11,943,872	14.1%	11,943,872	14.1%	0.0%
Frame objects created	449	0.0%	449	0.0%	0.0%
Frames pushed	83,021,633	97.9%	83,021,633	97.9%	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	191		118		-38.2%
Method cache misses	448		520		16.1%
Method cache collisions	570		563		-1.2%
Method cache dunder hits	1,195,794		1,195,867		0.0%
Method cache hits	27,478,718		27,478,646		-0.0%
Frees	62,858,402		62,858,412		0.0%
Immortal decrefs	168,769,873	12.7%	168,769,852	12.7%	-0.0%
Immortal increfs	132,550,014	11.3%	132,550,002	11.3%	-0.0%
Mortal decrefs	323,900,466	24.5%	323,900,483	24.5%	0.0%
Mortal increfs	290,288,467	24.8%	290,288,476	24.8%	0.0%
Allocations from freelist	44,190,464	41.3%	44,190,464	41.3%	0.0%
Frees to freelist	44,193,222		44,193,222		0.0%
Allocations	62,860,926	58.7%	62,860,926	58.7%	0.0%
Allocations to 512 bytes	62,216,870	58.1%	62,216,870	58.1%	0.0%
Allocations to 4 kbytes	644,056	0.6%	644,056	0.6%	0.0%
Allocations over 4 kbytes	0	0.0%	0	0.0%
Inline values	4,777,922		4,777,922		0.0%
Interpreter mortal increfs	630,166,804	53.9%	630,166,804	53.9%	0.0%
Interpreter mortal decrefs	686,598,018	51.8%	686,598,018	51.8%	0.0%
Interpreter immortal increfs	115,207,682	9.9%	115,207,682	9.9%	0.0%
Interpreter immortal decrefs	145,330,487	11.0%	145,330,487	11.0%	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	14,273	389	388,346,280	33,528,358	29,357,588	14,273	389	388,347,048	33,528,094	29,357,588
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
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.	2,879		2,879		0.0%
Traces created ⓘ The number of traces that were successfully created.	152	5.3%	152	5.3%	0.0%
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.	894	31.1%	894	31.1%	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.	2,727	94.7%	2,727	94.7%	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.	22	0.8%	22	0.8%	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%
Traces executed ⓘ The number of traces that were executed	13,112,725		13,112,725		0.0%
Uops executed ⓘ The total number of uops (micro-operations) that were executed	640,092,551	4,881.5%	640,092,551	4,881.5%	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.	152		152		0.0%
Optimizer successes ⓘ The number of traces that were successfully optimized.	152	100.0%	152	100.0%	0.0%
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%

Trace length histogram

trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 1	0	0.0%	0	0.0%
<= 2	0	0.0%	0	0.0%
<= 4	0	0.0%	0	0.0%
<= 8	0	0.0%	0	0.0%
<= 16	0	0.0%	0	0.0%
<= 32	43	28.3%	43	28.3%	0.0%
<= 64	44	28.9%	44	28.9%	0.0%
<= 128	65	42.8%	65	42.8%	0.0%

Optimized trace length histogram

optimized trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 1	0	0.0%	0	0.0%
<= 2	0	0.0%	0	0.0%
<= 4	0	0.0%	0	0.0%
<= 8	0	0.0%	0	0.0%
<= 16	21	13.8%	21	13.8%	0.0%
<= 32	44	28.9%	44	28.9%	0.0%
<= 64	87	57.2%	87	57.2%	0.0%

Trace run length histogram

trace run length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 1	0	0.0%	0	0.0%

Uop execution stats

uop execution stats

Name	Base Count	Head Count	Change
_SET_IP	64,650,571	64,650,571	0.0%
_CHECK_VALIDITY	51,877,882	51,877,882	0.0%
_LOAD_FAST_0	45,700,730	45,700,730	0.0%
_LOAD_ATTR_SLOT	31,032,600	31,032,600	0.0%
_GUARD_TYPE_VERSION	30,550,267	30,550,267	0.0%
_CHECK_PERIODIC	19,661,239	19,661,239	0.0%
_CHECK_MANAGED_OBJECT_HAS_VALUES	18,568,370	18,568,370	0.0%
_LOAD_ATTR_INSTANCE_VALUE	18,568,370	18,568,370	0.0%
_GUARD_IS_FALSE_POP	17,200,696	17,200,696	0.0%
_CHECK_VALIDITY_AND_SET_IP	16,410,390	16,410,390	0.0%
_TO_BOOL_BOOL	15,937,399	15,937,399	0.0%
_LOAD_FAST_3	15,937,399	15,937,399	0.0%
_PUSH_NULL	15,745,851	15,745,851	0.0%
_LOAD_METHOD_NO_DICT	15,516,300	15,516,300	0.0%
_MAKE_WARM	13,112,725	13,112,725	0.0%
_START_EXECUTOR	13,112,725	13,112,725	0.0%
_PUSH_FRAME	12,772,689	12,772,689	0.0%
_EXIT_TRACE	11,903,089	11,903,089	0.0%
_CHECK_FUNCTION_EXACT_ARGS	11,878,599	11,878,599	0.0%
_CHECK_FUNCTION_VERSION	11,878,599	11,878,599	0.0%
_SAVE_RETURN_OFFSET	11,878,599	11,878,599	0.0%
_STORE_FAST_3	11,807,608	11,807,608	0.0%
_GUARD_NOT_EXHAUSTED_RANGE	11,252,439	11,252,439	0.0%
_ITER_CHECK_RANGE	11,252,439	11,252,439	0.0%
_ITER_NEXT_RANGE	10,668,984	10,668,984	0.0%
_CHECK_STACK_SPACE_OPERAND	8,652,240	8,652,240	0.0%
_RESUME_CHECK	8,475,696	8,475,696	0.0%
_INIT_CALL_PY_EXACT_ARGS_0	8,073,675	8,073,675	0.0%
_BUILD_LIST	7,758,150	7,758,150	0.0%
_CALL_INTRINSIC_1	7,758,150	7,758,150	0.0%
_LIST_EXTEND	7,758,150	7,758,150	0.0%
_CALL_METHOD_DESCRIPTOR_NOARGS	7,758,150	7,758,150	0.0%
_LOAD_ATTR	7,758,150	7,758,150	0.0%
_STORE_FAST	7,758,150	7,758,150	0.0%
_GUARD_DORV_VALUES_INST_ATTR_FROM_DICT	6,539,193	6,539,193	0.0%
_GUARD_KEYS_VERSION	6,539,193	6,539,193	0.0%
_LOAD_METHOD_WITH_VALUES	6,539,193	6,539,193	0.0%
_LOAD_FAST_1	4,364,983	4,364,983	0.0%
_LOAD_CONST_INLINE_BORROW	4,245,608	4,245,608	0.0%
_LOAD_FAST_2	3,628,359	3,628,359	0.0%
_CHECK_STACK_SPACE	3,226,359	3,226,359	0.0%
_BINARY_OP_SUBTRACT_INT	2,910,834	2,910,834	0.0%
_GUARD_NOS_INT	2,910,834	2,910,834	0.0%
_INIT_CALL_PY_EXACT_ARGS_1	2,910,834	2,910,834	0.0%
_LOAD_SMALL_INT_1	2,910,834	2,910,834	0.0%
_GUARD_IS_NONE_POP	2,525,397	2,525,397	0.0%
_POP_TOP	1,209,636	1,209,636	0.0%
_DYNAMIC_EXIT	1,209,615	1,209,615	0.0%
_TO_BOOL	1,157,723	1,157,723	0.0%
_RETURN_GENERATOR	894,090	894,090	0.0%
_GET_AWAITABLE	894,090	894,090	0.0%
_SEND_GEN_FRAME	894,090	894,090	0.0%
_INIT_CALL_PY_EXACT_ARGS_3	492,090	492,090	0.0%
_LOAD_CONST_INLINE	459,102	459,102	0.0%
_TO_BOOL_LIST	421,099	421,099	0.0%
_INIT_CALL_PY_EXACT_ARGS_2	402,000	402,000	0.0%
_GUARD_DORV_NO_DICT	315,525	315,525	0.0%
_GUARD_IS_TRUE_POP	315,525	315,525	0.0%
_GUARD_TYPE_VERSION_AND_LOCK	315,525	315,525	0.0%
_STORE_ATTR_INSTANCE_VALUE	315,525	315,525	0.0%
_CALL_KW_NON_PY	229,551	229,551	0.0%
_CHECK_FUNCTION	229,551	229,551	0.0%
_CHECK_IS_NOT_PY_CALLABLE_KW	229,551	229,551	0.0%
_TIER2_RESUME_CHECK	229,551	229,551	0.0%
_DEOPT	21	21	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	1,898	1,898	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	21	21	0.0%

Stats gathered on: 2025-01-22

Files

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Execution counts

Pair counts

Predecessor/Successor Pairs

Specialization stats

BINARY_OP

BINARY_SUBSCR

CALL

CALL_KW

COMPARE_OP

CONTAINS_OP

FOR_ITER

LOAD_ATTR

LOAD_GLOBAL

LOAD_METHOD

LOAD_SUPER_ATTR

LOAD_SUPER_METHOD

SEND

STORE_ATTR

STORE_SUBSCR

TO_BOOL

UNPACK_SEQUENCE

Specialization effectiveness

Deferred by instruction

Misses by instruction

Call stats

Object stats

GC stats

Optimization (Tier 2) stats

Trace length histogram

Optimized trace length histogram

Trace run length histogram

Uop execution stats

Pair counts

Unsupported opcodes

Optimizer errored out with opcode

Rare events

Meta stats