bm-20250205-azure-x86_64-brandtbucher-justin_compact_exits-3.14.0a4+-31b1d53-pystats-2to3-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
LOAD_FAST	42,980	42,980	0.0%
STORE_FAST	11,260	11,260	0.0%
LOAD_ATTR	9,560	9,560	0.0%
POP_JUMP_IF_FALSE	9,100	9,100	0.0%
LOAD_GLOBAL	8,120	8,120	0.0%
CALL	7,960	7,960	0.0%
RETURN_VALUE	6,920	6,920	0.0%
LOAD_CONST	6,560	6,560	0.0%
LOAD_CONST_IMMORTAL	6,340	6,340	0.0%
LOAD_FAST_LOAD_FAST	5,620	5,620	0.0%
LOAD_GLOBAL_MODULE	4,960	4,960	0.0%
POP_TOP	4,920	4,920	0.0%
TO_BOOL	4,680	4,680	0.0%
RESUME_CHECK	4,640	4,640	0.0%
PUSH_NULL	4,140	4,140	0.0%
LOAD_GLOBAL_BUILTIN	3,340	3,340	0.0%
LOAD_ATTR_INSTANCE_VALUE	3,320	3,320	0.0%
POP_JUMP_IF_NOT_NONE	3,120	3,120	0.0%
STORE_ATTR	2,880	2,880	0.0%
LOAD_ATTR_MODULE	2,760	2,760	0.0%
RESUME	2,480	2,480	0.0%
COMPARE_OP	2,320	2,320	0.0%
TO_BOOL_BOOL	2,320	2,320	0.0%
NOP	2,200	2,200	0.0%
STORE_ATTR_INSTANCE_VALUE	2,060	2,060	0.0%
LOAD_SMALL_INT	2,000	2,000	0.0%
POP_JUMP_IF_TRUE	1,900	1,900	0.0%
LOAD_DEREF	1,880	1,880	0.0%
POP_JUMP_IF_NONE	1,860	1,860	0.0%
LOAD_ATTR_METHOD_NO_DICT	1,800	1,800	0.0%
BUILD_TUPLE	1,660	1,660	0.0%
CALL_PY_EXACT_ARGS	1,660	1,660	0.0%
SWAP	1,520	1,520	0.0%
LOAD_CONST_MORTAL	1,520	1,520	0.0%
INTERPRETER_EXIT	1,500	1,500	0.0%
STORE_FAST_STORE_FAST	1,360	1,360	0.0%
CALL_NON_PY_GENERAL	1,360	1,360	0.0%
COMPARE_OP_INT	1,200	1,200	0.0%
COPY	1,180	1,180	0.0%
BINARY_OP	1,140	1,140	0.0%
JUMP_FORWARD	1,120	1,120	0.0%
LOAD_SPECIAL	1,120	1,120	0.0%
CALL_METHOD_DESCRIPTOR_FAST	1,100	1,100	0.0%
LOAD_ATTR_METHOD_WITH_VALUES	1,040	1,040	0.0%
UNPACK_SEQUENCE	1,020	1,020	0.0%
CALL_BUILTIN_FAST	1,020	1,020	0.0%
CALL_BUILTIN_FAST_WITH_KEYWORDS	940	940	0.0%
CALL_FUNCTION_EX	840	840	0.0%
MAKE_CELL	840	840	0.0%
CALL_PY_GENERAL	800	800	0.0%
UNPACK_SEQUENCE_TWO_TUPLE	800	800	0.0%
CALL_ISINSTANCE	760	760	0.0%
JUMP_BACKWARD_JIT	660	660	0.0%
POP_ITER	640	640	0.0%
BUILD_MAP	620	620	0.0%
BUILD_LIST	600	600	0.0%
DELETE_ATTR	600	600	0.0%
GET_ITER	580	580	0.0%
FOR_ITER	580	580	0.0%
DICT_MERGE	560	560	0.0%
STORE_DEREF	560	560	0.0%
BINARY_SUBSCR	500	500	0.0%
CALL_KW	500	500	0.0%
IS_OP	500	500	0.0%
COPY_FREE_VARS	480	480	0.0%
TO_BOOL_STR	460	460	0.0%
FOR_ITER_TUPLE	440	440	0.0%
COMPARE_OP_STR	420	420	0.0%
MAKE_FUNCTION	420	420	0.0%
SET_FUNCTION_ATTRIBUTE	420	420	0.0%
BINARY_SLICE	400	400	0.0%
EXTENDED_ARG	400	400	0.0%
CALL_LEN	400	400	0.0%
CALL_METHOD_DESCRIPTOR_O	380	380	0.0%
BINARY_OP_ADD_INT	340	340	0.0%
JUMP_BACKWARD	320	320	0.0%
CALL_BUILTIN_CLASS	300	300	0.0%
TO_BOOL_NONE	300	300	0.0%
BINARY_SUBSCR_TUPLE_INT	260	260	0.0%
CALL_KW_PY	260	260	0.0%
CALL_METHOD_DESCRIPTOR_NOARGS	260	260	0.0%
BINARY_SUBSCR_LIST_INT	240	240	0.0%
TO_BOOL_INT	240	240	0.0%
CHECK_EXC_MATCH	200	200	0.0%
POP_EXCEPT	200	200	0.0%
PUSH_EXC_INFO	200	200	0.0%
RETURN_GENERATOR	200	200	0.0%
YIELD_VALUE	200	200	0.0%
LOAD_ATTR_SLOT	200	200	0.0%
LOAD_ATTR_CLASS	180	180	0.0%
CONTAINS_OP	160	160	0.0%
CALL_INTRINSIC_1	140	140	0.0%
LIST_EXTEND	140	140	0.0%
CALL_KW_NON_PY	120	120	0.0%
CALL_METHOD_DESCRIPTOR_FAST_WITH_KEYWORDS	120	120	0.0%
FOR_ITER_LIST	120	120	0.0%
LOAD_ATTR_METHOD_LAZY_DICT	120	120	0.0%
UNPACK_SEQUENCE_TUPLE	120	120	0.0%
BINARY_OP_MULTIPLY_INT	80	80	0.0%
CALL_BUILTIN_O	80	80	0.0%
FOR_ITER_RANGE	80	80	0.0%
BINARY_OP_INPLACE_ADD_UNICODE	60	60	0.0%
IMPORT_NAME	60	60	0.0%
BINARY_OP_ADD_UNICODE	60	60	0.0%
CALL_STR_1	60	60	0.0%
CALL_TUPLE_1	60	60	0.0%
CALL_TYPE_1	60	60	0.0%
JUMP_BACKWARD_NO_JIT	60	60	0.0%
LOAD_ATTR_CLASS_WITH_METACLASS_CHECK	60	60	0.0%
STORE_SUBSCR_DICT	60	60	0.0%
TO_BOOL_ALWAYS_TRUE	60	60	0.0%
STORE_SUBSCR	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.	900	53.6%	900	53.6%	0.0%
hit ⓘ Specialized instructions that complete.	540	32.1%	540	32.1%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	80	33.3%	80	33.3%	0.0%
Failure	160	66.7%	160	66.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
multiply different types	100	62.5%	100	62.5%	0.0%
add other	40	25.0%	40	25.0%	0.0%
add different types	20	12.5%	20	12.5%	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.	400	100.0%	400	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.	300	30.0%	300	30.0%	0.0%
hit ⓘ Specialized instructions that complete.	500	50.0%	500	50.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	180	90.0%	180	90.0%	0.0%
Failure	20	10.0%	20	10.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
list slice	20	100.0%	20	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.	5,680	37.5%	5,680	37.5%	0.0%
hit ⓘ Specialized instructions that complete.	7,200	47.5%	7,200	47.5%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	2,280	100.0%	2,280	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.	320	64.0%	320	64.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	180	100.0%	180	100.0%	0.0%
Failure	0	0.0%	0	0.0%

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.	1,820	46.2%	1,820	46.2%	0.0%
hit ⓘ Specialized instructions that complete.	1,480	37.6%	1,480	37.6%	0.0%
miss ⓘ Specialized instructions that deopt.	140	3.6%	140	3.6%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	480	96.0%	480	96.0%	0.0%
Failure	20	4.0%	20	4.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
different types	20	100.0%	20	100.0%	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.	160	100.0%	160	100.0%	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.	380	31.1%	380	31.1%	0.0%
hit ⓘ Specialized instructions that complete.	640	52.5%	640	52.5%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	120	60.0%	120	60.0%	0.0%
Failure	80	40.0%	80	40.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
dict values	80	100.0%	80	100.0%	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.	6,500	34.1%	6,500	34.1%	0.0%
hit ⓘ Specialized instructions that complete.	9,200	48.3%	9,200	48.3%	0.0%
miss ⓘ Specialized instructions that deopt.	280	1.5%	280	1.5%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	3,020	98.7%	3,020	98.7%	0.0%
Failure	40	1.3%	40	1.3%	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.	5,920	36.1%	5,920	36.1%	0.0%
hit ⓘ Specialized instructions that complete.	7,640	46.5%	7,640	46.5%	0.0%
miss ⓘ Specialized instructions that deopt.	660	4.0%	660	4.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	2,200	100.0%	2,200	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
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	2,320	47.0%	2,320	47.0%	0.0%
hit ⓘ Specialized instructions that complete.	2,060	41.7%	2,060	41.7%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	500	89.3%	500	89.3%	0.0%
Failure	60	10.7%	60	10.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
class attr simple	40	66.7%	40	66.7%	0.0%
not managed dict	20	33.3%	20	33.3%	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.	60	75.0%	60	75.0%	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%

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.	3,600	45.0%	3,600	45.0%	0.0%
hit ⓘ Specialized instructions that complete.	3,180	39.8%	3,180	39.8%	0.0%
miss ⓘ Specialized instructions that deopt.	140	1.8%	140	1.8%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	880	81.5%	880	81.5%	0.0%
Failure	200	18.5%	200	18.5%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
sequence	100	50.0%	100	50.0%	0.0%
bytes	40	20.0%	40	20.0%	0.0%
bytearray	20	10.0%	20	10.0%	0.0%
dict	20	10.0%	20	10.0%	0.0%
tuple	20	10.0%	20	10.0%	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.	720	37.1%	720	37.1%	0.0%
hit ⓘ Specialized instructions that complete.	920	47.4%	920	47.4%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	300	100.0%	300	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
Basic ⓘ Instructions that are not and cannot be specialized, e.g. LOAD_FAST.	126,120	58.3%	126,120	58.3%	0.0%
Not specialized ⓘ Instructions that could be specialized but aren't, e.g. LOAD_ATTR, BINARY_SLICE.	39,840	18.4%	39,840	18.4%	0.0%
Specialized hits ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that complete.	49,240	22.8%	49,240	22.8%	0.0%
Specialized misses ⓘ Specialized instructions, e.g. LOAD_ATTR_MODULE that deopt.	1,220	0.6%	1,220	0.6%	0.0%

Deferred by instruction

Breakdown of deferred (not specialized) instruction counts by family

Name	Base Count	Base Ratio	Head Count	Head Ratio	Change
LOAD_ATTR	6,500	22.4%	6,500	22.4%	0.0%
LOAD_GLOBAL	5,920	20.4%	5,920	20.4%	0.0%
CALL	5,680	19.6%	5,680	19.6%	0.0%
TO_BOOL	3,600	12.4%	3,600	12.4%	0.0%
STORE_ATTR	2,320	8.0%	2,320	8.0%	0.0%
COMPARE_OP	1,820	6.3%	1,820	6.3%	0.0%
BINARY_OP	900	3.1%	900	3.1%	0.0%
UNPACK_SEQUENCE	720	2.5%	720	2.5%	0.0%
BINARY_SLICE	400	1.4%	400	1.4%	0.0%
FOR_ITER	380	1.3%	380	1.3%	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_GLOBAL_BUILTIN	660	54.1%	660	54.1%	0.0%
LOAD_ATTR_METHOD_NO_DICT	280	23.0%	280	23.0%	0.0%
COMPARE_OP_STR	140	11.5%	140	11.5%	0.0%
TO_BOOL_STR	140	11.5%	140	11.5%	0.0%
CACHE	0	0.0%	0	0.0%
BINARY_OP_INPLACE_ADD_UNICODE	0	0.0%
CALL_FUNCTION_EX	0	0.0%	0	0.0%
CHECK_EXC_MATCH	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%

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	1,640	22.4%	1,640	22.4%	0.0%
Calls to Python functions inlined	5,680	77.6%	5,680	77.6%	0.0%
Calls via PyEval_EvalFrame (total)	1,640	22.4%	1,640	22.4%	0.0%
Calls via PyEval_EvalFrame (vector)	1,240	16.9%	1,240	16.9%	0.0%
Calls via PyEval_EvalFrame (generator)	400	5.5%	400	5.5%	0.0%
Calls via PyEval_EvalFrame (legacy)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (function vectorcall)	1,240	16.9%	1,240	16.9%	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)	480	6.6%	480	6.6%	0.0%
Calls via PyEval_EvalFrame (api)	200	2.7%	200	2.7%	0.0%
Calls via PyEval_EvalFrame (method)	0	0.0%	0	0.0%
Frame objects created	200	2.7%	200	2.7%	0.0%
Frames pushed	6,920	94.5%	6,920	94.5%	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 misses	5,288		5,328		0.8%
Method cache dunder misses	1,405		1,397		-0.6%
Method cache hits	10,052		10,012		-0.4%
Method cache dunder hits	2,755		2,763		0.3%
Frees	13,986		14,007		0.2%
Mortal decrefs	51,435	22.2%	51,481	22.2%	0.1%
Immortal increfs	51,434	24.9%	51,479	24.9%	0.1%
Method cache collisions	5,378		5,382		0.1%
Immortal decrefs	46,073	19.9%	46,101	19.9%	0.1%
Mortal increfs	52,633	25.5%	52,657	25.5%	0.0%
Allocations from freelist	11,720	45.1%	11,720	45.1%	0.0%
Frees to freelist	11,660		11,660		0.0%
Allocations	14,280	54.9%	14,280	54.9%	0.0%
Allocations to 512 bytes	13,880	53.4%	13,880	53.4%	0.0%
Allocations to 4 kbytes	140	0.5%	140	0.5%	0.0%
Allocations over 4 kbytes	260	1.0%	260	1.0%	0.0%
Inline values	540		540		0.0%
Interpreter mortal increfs	62,860	30.4%	62,860	30.4%	0.0%
Interpreter mortal decrefs	84,340	36.3%	84,340	36.3%	0.0%
Interpreter immortal increfs	39,640	19.2%	39,640	19.2%	0.0%
Interpreter immortal decrefs	50,240	21.6%	50,240	21.6%	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	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
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.	0		0
Traces created ⓘ The number of traces that were successfully created.	0		0
Trace stack overflow ⓘ A trace is truncated because it would require more than 5 stack frames.	0		0
Trace stack underflow ⓘ A potential trace is abandoned because it pops more frames than it pushes.	0		0
Trace too long ⓘ A trace is truncated because it is longer than the instruction buffer.	0		0
Trace too short ⓘ A potential trace is abandoned because it it too short.	0		0
Inner loop found ⓘ A trace is truncated because it has an inner loop	0		0
Recursive call ⓘ A trace is truncated because it has a recursive call.	0		0
Low confidence ⓘ A trace is abandoned because the likelihood of the jump to top being taken is too low.	0		0
Executors invalidated ⓘ The number of executors that were invalidated due to watched dictionary changes.	0		0
Traces executed ⓘ The number of traces that were executed	0		0
Uops executed ⓘ The total number of uops (micro-operations) that were executed	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.	0		0
Optimizer successes ⓘ The number of traces that were successfully optimized.	0		0
Optimizer no memory ⓘ The number of optimizations that failed due to no memory.	0		0
Remove globals builtins changed ⓘ The builtins changed during optimization	0		0
Remove globals incorrect keys ⓘ The keys in the globals dictionary aren't what was expected	0		0

JIT memory stats

JIT memory stats

	Base Size (bytes)	Base Ratio	Head Size (bytes)	Head Ratio	Change
Total memory size ⓘ The total size of the memory allocated for the JIT traces	0		0
Code size ⓘ The size of the memory allocated for the code of the JIT traces	0		0
Trampoline size ⓘ The size of the memory allocated for the trampolines of the JIT traces	0		0
Data size ⓘ The size of the memory allocated for the data of the JIT traces	0		0
Padding size ⓘ The size of the memory allocated for the padding of the JIT traces	0		0
Freed memory size ⓘ The size of the memory freed from the JIT traces	0		0

JIT trace total memory histogram

JIT trace total memory histogram

Trace length histogram

trace length histogram

Optimized trace length histogram

optimized trace length histogram

Trace run length histogram

trace run length histogram

Uop execution stats

uop execution stats

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	100	100	0.0%

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Stats gathered on: 2025-02-06