bm-20250205-azure-x86_64-brandtbucher-justin_compact_exits-3.14.0a4+-31b1d53-pystats-hexiom-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
JUMP_BACKWARD_JIT	1,005,880	1,676,380	66.7%
CALL_BUILTIN_FAST_WITH_KEYWORDS	223,760	344,880	54.1%
RETURN_GENERATOR	223,820	344,940	54.1%
COPY_FREE_VARS	223,820	344,940	54.1%
SET_FUNCTION_ATTRIBUTE	223,820	344,940	54.1%
MAKE_FUNCTION	223,880	345,000	54.1%
FOR_ITER_RANGE	1,308,360	1,976,240	51.0%
LOAD_GLOBAL_BUILTIN	1,789,740	2,365,200	32.2%
CALL_BUILTIN_CLASS	981,520	1,236,160	25.9%
BUILD_TUPLE	548,580	671,100	22.3%
EXTENDED_ARG	357,980	424,060	18.5%
POP_JUMP_IF_NOT_NONE	376,780	443,500	17.7%
LOAD_CONST_MORTAL	698,180	819,300	17.3%
NOT_TAKEN	471,680	535,860	13.6%
CALL_PY_EXACT_ARGS	7,838,040	8,754,420	11.7%
LOAD_ATTR_METHOD_WITH_VALUES	7,300,200	8,095,460	10.9%
BUILD_LIST	618,220	684,300	10.7%
LOAD_ATTR_INSTANCE_VALUE	7,588,560	8,359,120	10.2%
POP_ITER	1,340,160	1,472,500	9.9%
GET_ITER	4,548,820	4,990,660	9.7%
FOR_ITER_LIST	3,854,240	4,172,700	8.3%
LOAD_FAST	43,308,960	46,111,980	6.5%
STORE_FAST	22,116,620	23,408,100	5.8%
BINARY_SUBSCR_LIST_INT	9,937,680	10,285,900	3.5%
BINARY_SUBSCR_GETITEM	5,689,880	5,887,440	3.5%
LOAD_FAST_LOAD_FAST	11,573,220	11,941,700	3.2%
POP_JUMP_IF_TRUE	10,568,060	10,801,720	2.2%
LOAD_DEREF	8,505,860	8,653,280	1.7%
COMPARE_OP_INT	9,759,340	9,927,920	1.7%
ENTER_EXECUTOR	68,939,360	69,779,220	1.2%
LOAD_GLOBAL_MODULE	6,908,120	6,957,720	0.7%
LOAD_SMALL_INT	22,303,440	22,336,220	0.1%
CALL_LEN	1,789,300	1,791,440	0.1%
RESUME_CHECK	31,825,240	31,853,020	0.1%
CALL_METHOD_DESCRIPTOR_O	58,700	58,740	0.1%
BINARY_OP_ADD_INT	7,892,960	7,895,760	0.0%
STORE_DEREF	114,440	114,460	0.0%
LOAD_CONST_IMMORTAL	2,495,800	2,496,060	0.0%
LOAD_ATTR_METHOD_NO_DICT	514,280	514,320	0.0%
CONTAINS_OP	7,916,260	7,916,520	0.0%
POP_JUMP_IF_FALSE	39,941,560	39,941,860	0.0%
POP_TOP	29,278,760	29,278,800	0.0%
RETURN_VALUE	43,827,360	43,827,360	0.0%
TO_BOOL_BOOL	32,763,900	32,763,900	0.0%
INTERPRETER_EXIT	28,723,560	28,723,560	0.0%
YIELD_VALUE	27,287,340	27,287,340	0.0%
SWAP	2,737,040	2,737,040	0.0%
COPY	2,203,800	2,203,800	0.0%
STORE_SUBSCR_LIST_INT	1,281,420	1,281,420	0.0%
BINARY_OP_SUBTRACT_INT	1,117,260	1,117,260	0.0%
STORE_ATTR_INSTANCE_VALUE	651,320	651,320	0.0%
CALL_LIST_APPEND	448,320	448,320	0.0%
BINARY_SUBSCR	421,600	421,600	0.0%
EXIT_INIT_CHECK	236,160	236,160	0.0%
CALL_ALLOC_AND_ENTER_INIT	236,160	236,160	0.0%
MAKE_CELL	207,420	207,420	0.0%
LIST_APPEND	203,520	203,520	0.0%
STORE_FAST_LOAD_FAST	201,260	201,260	0.0%
LOAD_ATTR_CLASS	188,220	188,220	0.0%
JUMP_FORWARD	165,180	165,180	0.0%
LOAD_FAST_AND_CLEAR	156,480	156,480	0.0%
BINARY_SUBSCR_TUPLE_INT	155,560	155,560	0.0%
CALL_PY_GENERAL	154,620	154,620	0.0%
STORE_FAST_STORE_FAST	124,920	124,920	0.0%
UNPACK_SEQUENCE_TWO_TUPLE	124,920	124,920	0.0%
CONTAINS_OP_DICT	109,440	109,440	0.0%
BINARY_SUBSCR_DICT	98,940	98,940	0.0%
COMPARE_OP_STR	36,540	36,540	0.0%
BINARY_SUBSCR_STR_INT	36,480	36,480	0.0%
CALL_KW_NON_PY	27,840	27,840	0.0%
BINARY_OP	25,220	25,220	0.0%
BINARY_SLICE	23,040	23,040	0.0%
STORE_SUBSCR_DICT	18,240	18,240	0.0%
CALL_STR_1	11,520	11,520	0.0%
BINARY_OP_MULTIPLY_INT	7,680	7,680	0.0%
CALL_METHOD_DESCRIPTOR_FAST	6,180	6,180	0.0%
PUSH_NULL	1,560	1,560	0.0%
CALL_NON_PY_GENERAL	1,320	1,320	0.0%
LOAD_ATTR_MODULE	1,260	1,260	0.0%
CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	1,020	1,020	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	1,020	1,020	0.0%
BUILD_MAP	960	960	0.0%
CALL_KW_PY	960	960	0.0%
LOAD_ATTR_METHOD_LAZY_DICT	960	960	0.0%
LOAD_ATTR	420	420	0.0%
CALL	380	380	0.0%
LOAD_GLOBAL	200	200	0.0%
CALL_FUNCTION_EX	120	120	0.0%
TO_BOOL	100	100	0.0%
NOP	60	60	0.0%
CALL_INTRINSIC_1	60	60	0.0%
FOR_ITER	60	60	0.0%
IS_OP	60	60	0.0%
LIST_EXTEND	60	60	0.0%
LOAD_FAST_CHECK	60	60	0.0%
BINARY_OP_SUBTRACT_FLOAT	60	60	0.0%
UNPACK_SEQUENCE	40	40	0.0%
COMPARE_OP	20	20	0.0%

Pair counts

Pair counts for top 100 opcode pairs

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

Not included in comparative output.

Predecessor/Successor Pairs

Top 5 predecessors and successors of each Tier 1 opcode.

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

Not included in comparative output.

Specialization stats

Specialization stats by family

BINARY_OP

specialization stats for BINARY_OP family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	24,960	0.2%	24,960	0.2%	0.0%
hit ⓘ Specialized instructions that complete.	11,242,620	99.8%	11,242,620	99.8%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	7.7%	20	7.7%	0.0%
Failure	240	92.3%	240	92.3%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
multiply different types	160	66.7%	160	66.7%	0.0%
remainder	80	33.3%	80	33.3%	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.	23,040	100.0%	23,040	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.	421,440	0.5%	421,440	0.5%	0.0%
hit ⓘ Specialized instructions that complete.	82,219,320	99.5%	82,219,320	99.5%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	40	25.0%	40	25.0%	0.0%
Failure	120	75.0%	120	75.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
list slice	120	100.0%	120	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.	76,126,140	100.0%	76,126,140	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	380	100.0%	380	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
hit ⓘ Specialized instructions that complete.	53,532,540	100.0%	53,532,540	100.0%	0.0%

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

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.	7,914,260	98.6%	7,914,520	98.6%	0.0%
hit ⓘ Specialized instructions that complete.	109,440	1.4%	109,440	1.4%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	0	0.0%	0	0.0%
Failure	2,000	100.0%	2,000	100.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
list	2,000	100.0%	2,000	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.	5,060,840	98.0%	6,047,180	98.3%	19.5%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	60	0.0%	60	0.0%	0.0%
miss ⓘ Specialized instructions that deopt.	101,760	2.0%	101,760	1.7%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	1,920	100.0%	1,920	100.0%	0.0%
Failure	0	0.0%	0	0.0%

LOAD_ATTR

specialization stats for LOAD_ATTR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	60	0.0%	60	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	105,165,540	100.0%	105,165,540	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	340	94.4%	340	94.4%	0.0%
Failure	20	5.6%	20	5.6%	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.	9,408,100	100.0%	9,743,800	100.0%	3.6%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	200	100.0%	200	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.	708,480	100.0%	708,480	100.0%	0.0%

STORE_SUBSCR

specialization stats for STORE_SUBSCR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	3,494,400	100.0%	3,494,400	100.0%	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.	60	0.0%	60	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	32,763,900	100.0%	32,763,900	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	50.0%	20	50.0%	0.0%
Failure	20	50.0%	20	50.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
sequence	20	100.0%	20	100.0%	0.0%

UNPACK_SEQUENCE

specialization stats for UNPACK_SEQUENCE family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	124,920	100.0%	124,920	100.0%	0.0%

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

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 misses ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that deopt.	102,480	0.0%	107,260	0.0%	4.7%
Specialized hits ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that complete.	146,838,460	27.9%	152,842,080	28.3%	4.1%
Basic ⓘ Instructions that are not and cannot be specialized, e.g. LOAD_FAST.	371,884,820	70.5%	379,046,120	70.1%	1.9%
Not specialized ⓘ Instructions that could be specialized but aren't, e.g. LOAD_ATTR, BINARY_SLICE.	8,387,340	1.6%	8,387,600	1.6%	0.0%

Deferred by instruction

Breakdown of deferred (not specialized) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
CONTAINS_OP	7,914,260	94.4%	7,914,520	94.4%	0.0%
BINARY_SUBSCR	421,440	5.0%	421,440	5.0%	0.0%
BINARY_OP	24,960	0.3%	24,960	0.3%	0.0%
BINARY_SLICE	23,040	0.3%	23,040	0.3%	0.0%
TO_BOOL	60	0.0%	60	0.0%	0.0%
FOR_ITER	60	0.0%	60	0.0%	0.0%
LOAD_ATTR	60	0.0%	60	0.0%	0.0%
STORE_SLICE	0	0.0%	0	0.0%
CACHE	0	0.0%	0	0.0%
CALL_FUNCTION_EX	0	0.0%	0	0.0%

Misses by instruction

Breakdown of misses (specialized deopts) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
RESUME	720	0.7%	5,500	4.9%	663.9%
RESUME_CHECK	720	0.7%	5,500	4.9%	663.9%
FOR_ITER_LIST	50,880	49.3%	50,880	45.1%	0.0%
FOR_ITER_RANGE	50,880	49.3%	50,880	45.1%	0.0%
CACHE	0	0.0%	0	0.0%
CALL_FUNCTION_EX	0	0.0%	0	0.0%
EXIT_INIT_CHECK	0	0.0%	0	0.0%
GET_ITER	0	0.0%	0	0.0%
INTERPRETER_EXIT	0	0.0%	0	0.0%
MAKE_FUNCTION	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	28,723,620	39.7%	28,723,620	39.7%	0.0%
Calls to Python functions inlined	43,591,140	60.3%	43,591,140	60.3%	0.0%
Calls via PyEval_EvalFrame (total)	28,723,620	39.7%	28,723,620	39.7%	0.0%
Calls via PyEval_EvalFrame (vector)	60	0.0%	60	0.0%	0.0%
Calls via PyEval_EvalFrame (generator)	28,723,560	39.7%	28,723,560	39.7%	0.0%
Calls via PyEval_EvalFrame (legacy)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (function vectorcall)	60	0.0%	60	0.0%	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)	60	0.0%	60	0.0%	0.0%
Calls via PyEval_EvalFrame (api)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (method)	0	0.0%	0	0.0%
Frame objects created	0	0.0%	0	0.0%
Frames pushed	43,827,360	60.6%	43,827,360	60.6%	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
Allocations over 4 kbytes	80	0.0%	160	0.0%	100.0%
Allocations to 4 kbytes	1,400	0.0%	1,800	0.0%	28.6%
Method cache misses	52		48		-7.7%
Mortal decrefs	433,387,390	32.8%	401,796,046	31.0%	-7.3%
Method cache collisions	43		40		-7.0%
Mortal increfs	520,646,268	52.0%	486,031,985	49.9%	-6.6%
Interpreter mortal increfs	146,949,020	14.7%	153,203,300	15.7%	4.3%
Interpreter immortal increfs	90,501,040	9.0%	93,072,900	9.6%	2.8%
Interpreter immortal decrefs	155,238,500	11.7%	157,466,280	12.2%	1.4%
Interpreter mortal decrefs	250,325,280	18.9%	253,582,860	19.6%	1.3%
Immortal increfs	243,436,278	24.3%	240,855,013	24.7%	-1.1%
Frees to freelist	7,930,560		7,955,740		0.3%
Allocations from freelist	7,930,640	41.9%	7,955,820	42.0%	0.3%
Immortal decrefs	483,723,716	36.6%	482,332,232	37.2%	-0.3%
Frees	11,305,522		11,307,161		0.0%
Method cache hits	51,168		51,172		0.0%
Allocations	10,982,640	58.1%	10,983,180	58.0%	0.0%
Allocations to 512 bytes	10,981,160	58.1%	10,981,220	58.0%	0.0%
Inline values	236,160		236,160		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%
Method cache dunder hits	94,139		94,139		0.0%
Method cache dunder misses	1		1		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
Traces executed ⓘ The number of traces that were executed	129,695,000		100,496,340		-22.5%
Traces created ⓘ The number of traces that were successfully created.	660	3.9%	740	4.4%	12.1%
Uops executed ⓘ The total number of uops (micro-operations) that were executed	2,672,761,520	2,060.8%	2,580,943,940	2,568.2%	-3.4%
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.	16,860		16,920		0.4%
Trace too short ⓘ A potential trace is abandoned because it it too short.	16,200	96.1%	16,180	95.6%	-0.1%
Trace stack underflow ⓘ A potential trace is abandoned because it pops more frames than it pushes.	16,280	96.6%	16,260	96.1%	-0.1%
Trace stack overflow ⓘ A trace is truncated because it would require more than 5 stack frames.	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%
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.	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.	660		740		12.1%
Optimizer successes ⓘ The number of traces that were successfully optimized.	660	100.0%	740	100.0%	12.1%
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
Freed memory size ⓘ The size of the memory freed from the JIT traces	491,520	6.5%	12,124,160	73.6%	2,366.7%
Code size ⓘ The size of the memory allocated for the code of the JIT traces	5,193,220	68.9%	11,974,140	72.7%	130.6%
Data size ⓘ The size of the memory allocated for the data of the JIT traces	883,360	11.7%	2,007,200	12.2%	127.2%
Total memory size ⓘ The total size of the memory allocated for the JIT traces	7,536,640		16,465,920		118.5%
Padding size ⓘ The size of the memory allocated for the padding of the JIT traces	1,460,060	19.4%	2,484,580	15.1%	70.2%
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	160	24.2%	140	12.5%	-12.5%
<= 8,192	240	36.4%	400	35.7%	66.7%
<= 16,384	160	24.2%	280	25.0%	75.0%
<= 32,768	100	15.2%	220	19.6%	120.0%
<= 65,536			80	7.1%

Trace length histogram

trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 8	140	21.2%	120	16.2%	-14.3%
<= 16	0	0.0%	0	0.0%
<= 32	260	39.4%	380	51.4%	46.2%
<= 64	140	21.2%	140	18.9%	0.0%
<= 128	80	12.1%	80	10.8%	0.0%
<= 256	40	6.1%	20	2.7%	-50.0%

Optimized trace length histogram

optimized trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 4	100	15.2%	80	10.8%	-20.0%
<= 8	40	6.1%	40	5.4%	0.0%
<= 16	20	3.0%	20	2.7%	0.0%
<= 32	280	42.4%	380	51.4%	35.7%
<= 64	140	21.2%	160	21.6%	14.3%
<= 128	80	12.1%	60	8.1%	-25.0%

Trace run length histogram

trace run length histogram

Uop execution stats

uop execution stats

Name	Base Count	Head Count	Change
_DEOPT	420	3,400	709.5%
_RESUME_CHECK	25,880	1,080	-95.8%
_STORE_FAST_7	25,880	1,080	-95.8%
_STORE_FAST_4	1,700	300	-82.4%
_BUILD_LIST	145,040	78,960	-45.6%
_GUARD_IS_NOT_NONE_POP	146,480	79,760	-45.5%
_GUARD_BUILTINS_VERSION_PUSH_KEYS	710,240	420,880	-40.7%
_GUARD_GLOBALS_VERSION	710,240	420,880	-40.7%
_LOAD_GLOBAL_BUILTINS_FROM_KEYS	710,240	420,880	-40.7%
_EXIT_TRACE	101,261,440	73,027,820	-27.9%
_CALL_BUILTIN_CLASS	1,113,260	858,620	-22.9%
_START_EXECUTOR	129,695,000	100,496,340	-22.5%
_GET_ITER	2,601,440	2,159,600	-17.0%
_BINARY_SUBSCR_CHECK_FUNC	1,244,200	1,046,640	-15.9%
_BINARY_SUBSCR_INIT_CALL	1,244,200	1,046,640	-15.9%
_JUMP_TO_TOP	4,611,840	5,328,120	15.5%
_INIT_CALL_PY_EXACT_ARGS_0	1,264,160	1,093,440	-13.5%
_CHECK_STACK_SPACE_OPERAND	1,238,280	1,092,360	-11.8%
_INIT_CALL_PY_EXACT_ARGS_2	1,171,160	1,049,980	-10.3%
_MAKE_FUNCTION	1,212,400	1,091,280	-10.0%
_RETURN_GENERATOR	1,212,400	1,091,280	-10.0%
_COPY_FREE_VARS	1,212,400	1,091,280	-10.0%
_SET_FUNCTION_ATTRIBUTE	1,212,400	1,091,280	-10.0%
_CALL_BUILTIN_FAST_WITH_KEYWORDS	1,212,400	1,091,280	-10.0%
_BUILD_TUPLE	1,233,300	1,110,780	-9.9%
_BINARY_OP_ADD_INT	29,920	27,120	-9.4%
_LOAD_SMALL_INT	403,020	372,420	-7.6%
_GUARD_BOTH_INT	1,860,480	1,736,560	-6.7%
_LOAD_FAST_5	3,635,940	3,412,180	-6.2%
_STORE_FAST_3	4,003,860	3,815,840	-4.7%
_STORE_FAST_5	33,060	31,660	-4.2%
_PUSH_FRAME	29,671,420	28,557,480	-3.8%
_DYNAMIC_EXIT	28,433,140	27,465,120	-3.4%
_CHECK_FUNCTION_EXACT_ARGS	28,377,280	27,460,900	-3.2%
_CHECK_FUNCTION_VERSION	28,377,280	27,460,900	-3.2%
_SAVE_RETURN_OFFSET	28,427,220	27,510,840	-3.2%
_POP_TOP	4,455,520	4,323,140	-3.0%
_LOAD_FAST_4	38,276,180	37,149,380	-2.9%
_GUARD_DORV_VALUES_INST_ATTR_FROM_DICT	27,164,880	26,369,620	-2.9%
_GUARD_KEYS_VERSION	27,164,880	26,369,620	-2.9%
_LOAD_ATTR_METHOD_WITH_VALUES	27,164,880	26,369,620	-2.9%
_LOAD_FAST	27,267,980	26,482,940	-2.9%
_CHECK_STACK_SPACE	27,188,940	26,418,480	-2.8%
_LOAD_FAST_3	6,904,680	6,715,240	-2.7%
_STORE_FAST	29,816,540	29,068,800	-2.5%
_INIT_CALL_PY_EXACT_ARGS_1	25,991,900	25,367,420	-2.4%
_ITER_NEXT_RANGE	27,737,080	27,095,380	-2.3%
_GUARD_NOT_EXHAUSTED_RANGE	29,583,540	28,915,660	-2.3%
_ITER_CHECK_RANGE	29,583,540	28,915,660	-2.3%
_LOAD_FAST_6	33,745,720	33,075,260	-2.0%
_STORE_FAST_6	16,792,980	16,466,300	-1.9%
_CHECK_VALIDITY_AND_SET_IP	88,811,000	87,352,840	-1.6%
_PUSH_NULL	37,063,420	36,463,160	-1.6%
_CHECK_PERIODIC	69,921,000	68,874,820	-1.5%
_SET_IP	318,949,320	314,936,460	-1.3%
_CHECK_MANAGED_OBJECT_HAS_VALUES	62,047,200	61,276,640	-1.2%
_LOAD_ATTR_INSTANCE_VALUE	62,047,200	61,276,640	-1.2%
_LOAD_CONST_INLINE	39,097,920	38,631,180	-1.2%
_GUARD_IS_TRUE_POP	29,024,960	28,685,060	-1.2%
_GUARD_TYPE_VERSION	71,697,860	70,945,240	-1.0%
_CHECK_VALIDITY	286,851,320	283,953,040	-1.0%
_CHECK_FUNCTION	36,236,580	35,900,880	-0.9%
_MAKE_WARM	134,306,840	133,101,160	-0.9%
_ITER_CHECK_LIST	38,760,520	38,437,300	-0.8%
_GUARD_NOT_EXHAUSTED_LIST	38,724,040	38,405,580	-0.8%
_GUARD_TOS_INT	5,643,880	5,598,600	-0.8%
_LOAD_FAST_0	48,589,740	48,200,320	-0.8%
_GUARD_IS_FALSE_POP	13,649,920	13,755,860	0.8%
_LOAD_FAST_7	2,342,040	2,327,380	-0.6%
_ITER_NEXT_LIST	35,474,720	35,263,760	-0.6%
_BINARY_SUBSCR_LIST_INT	65,006,640	64,658,420	-0.5%
_LOAD_DEREF	29,338,420	29,191,000	-0.5%
_COMPARE_OP_INT	43,736,660	43,568,080	-0.4%
_LOAD_CONST_INLINE_BORROW	4,446,140	4,455,800	0.2%
_LOAD_FAST_1	66,071,000	65,933,740	-0.2%
_STORE_FAST_2	1,994,120	1,992,680	-0.1%
_LOAD_FAST_2	4,991,940	4,988,800	-0.1%
_CALL_METHOD_DESCRIPTOR_O	359,980	359,940	-0.0%
_LOAD_ATTR_METHOD_NO_DICT	359,980	359,940	-0.0%
_CALL_LEN	33,417,740	33,415,600	-0.0%
_GUARD_NOS_INT	37,866,200	37,864,020	-0.0%
_LOAD_SMALL_INT_1	41,621,800	41,619,660	-0.0%
_STORE_DEREF	1,544,500	1,544,480	-0.0%
_CONTAINS_OP	28,459,180	28,458,920	-0.0%
_LOAD_SMALL_INT_0	24,308,600	24,308,560	-0.0%
_TIER2_RESUME_CHECK	39,027,840	39,027,840	0.0%
_STORE_FAST_1	26,276,160	26,276,160	0.0%
_SWAP	4,446,640	4,446,640	0.0%
_COPY	4,389,480	4,389,480	0.0%
_STORE_SUBSCR_LIST_INT	2,194,740	2,194,740	0.0%
_BINARY_OP_SUBTRACT_INT	2,194,740	2,194,740	0.0%
_LIST_APPEND	1,954,560	1,954,560	0.0%
_BINARY_SUBSCR	1,935,360	1,935,360	0.0%
_GUARD_DORV_NO_DICT	57,160	57,160	0.0%
_GUARD_TYPE_VERSION_AND_LOCK	57,160	57,160	0.0%
_STORE_ATTR_INSTANCE_VALUE	57,160	57,160	0.0%
_BINARY_SUBSCR_TUPLE_INT	49,940	49,940	0.0%
_CHECK_FUNCTION_VERSION_INLINE	49,940	49,940	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

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	20	20	0.0%

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Stats gathered on: 2025-02-06