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
ENTER_EXECUTOR	11,540,240	11,647,060	0.9%
CALL_METHOD_DESCRIPTOR_NOARGS	9,660	9,640	-0.2%
LOAD_ATTR_METHOD_NO_DICT	9,720	9,700	-0.2%
LOAD_ATTR	9,900	9,880	-0.2%
POP_ITER	11,520	11,540	0.2%
STORE_ATTR_INSTANCE_VALUE	1,207,680	1,207,620	-0.0%
CALL_BUILTIN_O	1,934,100	1,934,060	-0.0%
LOAD_CONST_IMMORTAL	1,212,280	1,212,260	-0.0%
PUSH_NULL	3,418,800	3,418,760	-0.0%
COMPARE_OP_INT	2,409,900	2,409,880	-0.0%
FOR_ITER_RANGE	3,031,140	3,031,160	0.0%
RESUME_CHECK	9,610,480	9,610,440	-0.0%
LOAD_FAST_LOAD_FAST	23,199,520	23,199,440	-0.0%
STORE_FAST	24,894,040	24,893,960	-0.0%
POP_JUMP_IF_FALSE	9,610,200	9,610,180	-0.0%
LOAD_FAST	82,611,480	82,611,360	-0.0%
LOAD_ATTR_INSTANCE_VALUE	51,693,580	51,693,580	0.0%
RETURN_VALUE	37,200,840	37,200,840	0.0%
LOAD_SMALL_INT	23,443,080	23,443,080	0.0%
BINARY_SUBSCR_LIST_INT	13,862,260	13,862,260	0.0%
BINARY_OP_SUBTRACT_INT	11,411,520	11,411,520	0.0%
BINARY_OP	10,233,460	10,233,460	0.0%
LOAD_GLOBAL_BUILTIN	9,613,020	9,613,020	0.0%
COMPARE_OP	8,402,100	8,402,100	0.0%
BINARY_OP_ADD_FLOAT	8,400,240	8,400,240	0.0%
EXIT_INIT_CHECK	8,400,120	8,400,120	0.0%
BINARY_SUBSCR_TUPLE_INT	7,800,060	7,800,060	0.0%
STORE_SUBSCR_LIST_INT	7,800,000	7,800,000	0.0%
CALL_PY_EXACT_ARGS	6,600,360	6,600,360	0.0%
LOAD_ATTR_METHOD_WITH_VALUES	6,600,360	6,600,360	0.0%
BINARY_OP_ADD_INT	5,789,620	5,789,620	0.0%
CALL_LEN	4,811,160	4,811,160	0.0%
GET_ITER	4,200,420	4,200,420	0.0%
CALL_BUILTIN_CLASS	4,200,420	4,200,420	0.0%
BINARY_OP_EXTEND	4,200,240	4,200,240	0.0%
POP_JUMP_IF_TRUE	4,200,180	4,200,180	0.0%
SWAP	4,189,080	4,189,080	0.0%
LOAD_GLOBAL_MODULE	3,884,520	3,884,520	0.0%
BUILD_TUPLE	3,600,360	3,600,360	0.0%
INTERPRETER_EXIT	3,000,120	3,000,120	0.0%
BINARY_OP_MULTIPLY_FLOAT	3,000,000	3,000,000	0.0%
BINARY_OP_SUBTRACT_FLOAT	2,400,300	2,400,300	0.0%
LOAD_CONST_MORTAL	2,400,120	2,400,120	0.0%
COMPARE_OP_FLOAT	2,400,000	2,400,000	0.0%
POP_TOP	2,107,980	2,107,980	0.0%
LOAD_ATTR_MODULE	2,084,340	2,084,340	0.0%
BUILD_LIST	1,230,840	1,230,840	0.0%
LIST_APPEND	1,230,720	1,230,720	0.0%
CALL_NON_PY_GENERAL	1,200,420	1,200,420	0.0%
LOAD_FAST_AND_CLEAR	1,200,120	1,200,120	0.0%
CALL_ALLOC_AND_ENTER_INIT	1,200,120	1,200,120	0.0%
COPY	1,200,000	1,200,000	0.0%
TO_BOOL_BOOL	600,300	600,300	0.0%
CALL_ISINSTANCE	600,240	600,240	0.0%
JUMP_FORWARD	600,060	600,060	0.0%
STORE_FAST_STORE_FAST	600,060	600,060	0.0%
UNPACK_SEQUENCE_TWO_TUPLE	600,060	600,060	0.0%
UNARY_NEGATIVE	600,000	600,000	0.0%
CALL_BOUND_METHOD_GENERAL	284,160	284,160	0.0%
NOT_TAKEN	121,340	121,340	0.0%
JUMP_BACKWARD_JIT	30,900	30,900	0.0%
BINARY_SUBSCR	11,220	11,220	0.0%
CALL	260	260	0.0%
COPY_FREE_VARS	180	180	0.0%
LOAD_DEREF	180	180	0.0%
POP_JUMP_IF_NOT_NONE	180	180	0.0%
CALL_PY_GENERAL	180	180	0.0%
CALL_METHOD_DESCRIPTOR_FAST	120	120	0.0%
CALL_TYPE_1	120	120	0.0%
LOAD_SUPER_ATTR_METHOD	120	120	0.0%
TO_BOOL_NONE	120	120	0.0%
TO_BOOL	100	100	0.0%
LOAD_GLOBAL	100	100	0.0%
CALL_FUNCTION_EX	60	60	0.0%
MAKE_FUNCTION	60	60	0.0%
NOP	60	60	0.0%
FOR_ITER	60	60	0.0%
IS_OP	60	60	0.0%
MAKE_CELL	60	60	0.0%
SET_FUNCTION_ATTRIBUTE	60	60	0.0%
STORE_DEREF	60	60	0.0%
CALL_METHOD_DESCRIPTOR_O	60	60	0.0%
UNPACK_SEQUENCE	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.	10,230,960	4.3%	10,230,960	4.3%	0.0%
hit ⓘ Specialized instructions that complete.	230,356,500	95.7%	230,356,500	95.7%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	0.8%	20	0.8%	0.0%
Failure	2,480	99.2%	2,480	99.2%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
power	1,320	53.2%	1,320	53.2%	0.0%
true divide float	560	22.6%	560	22.6%	0.0%
multiply different types	180	7.3%	180	7.3%	0.0%
add other	140	5.6%	140	5.6%	0.0%
subtract other	140	5.6%	140	5.6%	0.0%
true divide other	140	5.6%	140	5.6%	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.	11,160	0.0%	11,160	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	57,777,900	100.0%	57,777,900	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	33.3%	20	33.3%	0.0%
Failure	40	66.7%	40	66.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
out of range	40	100.0%	40	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.	120	0.0%	120	0.0%	0.0%
hit ⓘ Specialized instructions that complete.	45,015,900	100.0%	45,015,900	100.0%	0.0%
miss ⓘ Specialized instructions that deopt.	120	0.0%	120	0.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	260	100.0%	260	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.	8,400,000	49.1%	8,400,000	49.1%	0.0%
hit ⓘ Specialized instructions that complete.	8,692,620	50.8%	8,692,620	50.8%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	20	1.0%	20	1.0%	0.0%
Failure	2,080	99.0%	2,080	99.0%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
float long	2,080	100.0%	2,080	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.	3,031,140	100.0%	3,031,160	100.0%	0.0%
deferred ⓘ Lists the number of "deferred" (i.e. not specialized) instructions executed.	60	0.0%	60	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.	9,660	0.0%	9,640	0.0%	-0.2%
hit ⓘ Specialized instructions that complete.	148,692,900	100.0%	148,692,900	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	200	83.3%	200	83.3%	0.0%
Failure	40	16.7%	40	16.7%	0.0%

Failure kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
method	20	50.0%	20	50.0%	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.	13,497,540	100.0%	13,497,540	100.0%	0.0%

Success	Base Count	Base Ratio	Head Count	Head Ratio	Change
Success	100	100.0%	100	100.0%	0.0%
Failure	0	0.0%	0	0.0%

LOAD_SUPER_ATTR

specialization stats for LOAD_SUPER_ATTR family

Kind	Base Count	Base Ratio	Head Count	Head Ratio	Change
hit ⓘ Specialized instructions that complete.	120	100.0%	120	100.0%	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.	26,407,920	100.0%	26,407,920	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.	7,800,000	100.0%	7,800,000	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.	600,420	100.0%	600,420	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.	600,060	100.0%	600,060	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%

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.	180	0.0%	140	0.0%	-22.2%
Basic ⓘ Instructions that are not and cannot be specialized, e.g. `LOAD_FAST`.	252,412,080	55.6%	252,518,580	55.6%	0.0%
Not specialized ⓘ Instructions that could be specialized but aren't, e.g. `LOAD_ATTR`, `BINARY_SLICE`.	18,657,220	4.1%	18,657,200	4.1%	-0.0%
Specialized hits ⓘ Specialized instructions, e.g. `LOAD_ATTR_MODULE` that complete.	182,893,820	40.3%	182,893,660	40.3%	-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	9,660	0.1%	9,640	0.1%	-0.2%
BINARY_OP	10,230,960	54.9%	10,230,960	54.9%	0.0%
COMPARE_OP	8,400,000	45.0%	8,400,000	45.0%	0.0%
BINARY_SUBSCR	11,160	0.1%	11,160	0.1%	0.0%
CALL	120	0.0%	120	0.0%	0.0%
TO_BOOL	60	0.0%	60	0.0%	0.0%
FOR_ITER	60	0.0%	60	0.0%	0.0%
BINARY_SLICE	0	0.0%	0	0.0%
STORE_SLICE	0	0.0%	0	0.0%
CACHE	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	60	25.0%	20	12.5%	-66.7%
RESUME_CHECK	60	25.0%	20	12.5%	-66.7%
CALL_METHOD_DESCRIPTOR_FAST	120	50.0%	120	75.0%	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%
NOP	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	3,000,180	10.4%	3,000,180	10.4%	0.0%
Calls to Python functions inlined	25,800,540	89.6%	25,800,540	89.6%	0.0%
Calls via PyEval_EvalFrame (total)	3,000,180	10.4%	3,000,180	10.4%	0.0%
Calls via PyEval_EvalFrame (vector)	3,000,180	10.4%	3,000,180	10.4%	0.0%
Calls via PyEval_EvalFrame (generator)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (legacy)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (function vectorcall)	3,000,180	10.4%	3,000,180	10.4%	0.0%
Calls via PyEval_EvalFrame (build class)	0	0.0%	0	0.0%
Calls via PyEval_EvalFrame (slot)	1,800,000	6.2%	1,800,000	6.2%	0.0%
Calls via PyEval_EvalFrame (function ex)	0	0.0%	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	37,200,840	129.2%	37,200,840	129.2%	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	32		25		-21.9%
Method cache collisions	57		52		-8.8%
Method cache misses	29		30		3.4%
Mortal increfs	411,921,141	45.4%	406,071,055	45.0%	-1.4%
Mortal decrefs	425,972,064	33.1%	420,121,916	32.7%	-1.4%
Allocations to 4 kbytes	30,800	0.0%	30,880	0.0%	0.3%
Interpreter mortal increfs	209,242,000	23.0%	209,348,660	23.2%	0.1%
Interpreter mortal decrefs	323,623,880	25.1%	323,730,620	25.2%	0.0%
Immortal decrefs	391,035,398	30.3%	391,142,374	30.5%	0.0%
Frees	26,484,063		26,484,341		0.0%
Allocations	25,284,160	19.7%	25,284,260	19.7%	0.0%
Method cache dunder hits	3,000,448		3,000,455		0.0%
Frees to freelist	103,210,720		103,210,480		-0.0%
Allocations from freelist	103,210,780	80.3%	103,210,540	80.3%	-0.0%
Allocations to 512 bytes	25,253,360	19.7%	25,253,320	19.7%	-0.0%
Interpreter immortal increfs	67,628,060	7.4%	67,627,960	7.5%	-0.0%
Immortal increfs	219,502,641	24.2%	219,502,835	24.3%	0.0%
Method cache hits	1,200,211		1,200,210		-0.0%
Interpreter immortal decrefs	148,018,360	11.5%	148,018,240	11.5%	-0.0%
Allocations over 4 kbytes	0	0.0%	60	0.0%	60 / 0 !!
Inline values	8,400,120		8,400,120		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
Traces executed ⓘ The number of traces that were executed	32,402,380		26,551,660		-18.1%
Trace too short ⓘ A potential trace is abandoned because it it too short.	2,700	97.1%	2,680	97.1%	-0.7%
Trace stack underflow ⓘ A potential trace is abandoned because it pops more frames than it pushes.	2,720	97.8%	2,700	97.8%	-0.7%
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.	2,780		2,760		-0.7%
Uops executed ⓘ The total number of uops (micro-operations) that were executed	2,042,213,060	6,302.7%	2,030,937,700	7,649.0%	-0.6%
Traces created ⓘ The number of traces that were successfully created.	80	2.9%	80	2.9%	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 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.	80		80		0.0%
Optimizer successes ⓘ The number of traces that were successfully optimized.	80	100.0%	80	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%

JIT memory stats

	Base Size (bytes)	Base Ratio	Head Size (bytes)	Head Ratio	Change
Data size ⓘ The size of the memory allocated for the data of the JIT traces	61,280	10.7%	702,080	14.0%	1,045.7%
Code size ⓘ The size of the memory allocated for the code of the JIT traces	388,460	67.7%	4,032,260	80.7%	938.0%
Total memory size ⓘ The total size of the memory allocated for the JIT traces	573,440		4,997,120		771.4%
Padding size ⓘ The size of the memory allocated for the padding of the JIT traces	123,700	21.6%	262,780	5.3%	112.4%
Trampoline size ⓘ The size of the memory allocated for the trampolines of the JIT traces	0	0.0%	0	0.0%
Freed memory size ⓘ The size of the memory freed from the JIT traces	0	0.0%	4,997,120	100.0%	4,997,120 / 0 !!

JIT trace total memory histogram

Size (bytes)	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 4,096	40	50.0%	40	18.2%	0.0%
<= 8,192	20	25.0%	40	18.2%	100.0%
<= 16,384	20	25.0%	60	27.3%	200.0%
<= 32,768			20	9.1%
<= 65,536			60	27.3%

Trace length histogram

trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 16	40	50.0%	40	50.0%	0.0%
<= 32	20	25.0%	20	25.0%	0.0%
<= 64	20	25.0%	20	25.0%	0.0%

Optimized trace length histogram

optimized trace length histogram

Range	Base Count	Base Ratio	Head Count	Head Ratio	Change
<= 16	40	50.0%	40	50.0%	0.0%
<= 32	20	25.0%	20	25.0%	0.0%
<= 64	20	25.0%	20	25.0%	0.0%

Trace run length histogram

trace run length histogram

Uop execution stats

uop execution stats

Name	Base Count	Head Count	Change
_DEOPT	60	40	-33.3%
_EXIT_TRACE	23,086,360	17,235,660	-25.3%
_START_EXECUTOR	32,402,380	26,551,660	-18.1%
_JUMP_TO_TOP	3,600,000	4,024,960	11.8%
_CALL_METHOD_DESCRIPTOR_NOARGS	1,190,400	1,190,420	0.0%
_LOAD_ATTR	1,190,400	1,190,420	0.0%
_LOAD_ATTR_METHOD_NO_DICT	1,190,400	1,190,420	0.0%
_STORE_FAST_2	1,256,420	1,256,440	0.0%
_CALL_BUILTIN_O	2,869,500	2,869,540	0.0%
_GUARD_IS_FALSE_POP	2,994,000	2,994,020	0.0%
_STORE_FAST_3	3,079,200	3,079,220	0.0%
_COMPARE_OP_INT	3,882,720	3,882,740	0.0%
_POP_TOP	6,281,520	6,281,500	-0.0%
_STORE_FAST_4	15,750,900	15,750,940	0.0%
_PUSH_NULL	16,385,340	16,385,380	0.0%
_GUARD_DORV_NO_DICT	25,200,240	25,200,300	0.0%
_GUARD_TYPE_VERSION_AND_LOCK	25,200,240	25,200,300	0.0%
_STORE_ATTR_INSTANCE_VALUE	25,200,240	25,200,300	0.0%
_CHECK_PERIODIC	27,563,460	27,563,520	0.0%
_LOAD_FAST_2	34,424,200	34,424,260	0.0%
_CHECK_VALIDITY_AND_SET_IP	46,254,900	46,254,980	0.0%
_LOAD_CONST_INLINE_BORROW	14,999,960	14,999,980	0.0%
_GUARD_BOTH_INT	16,704,380	16,704,400	0.0%
_LOAD_FAST_1	52,362,080	52,362,140	0.0%
_LOAD_FAST_3	61,182,760	61,182,820	0.0%
_LOAD_FAST_0	83,505,380	83,505,460	0.0%
_GUARD_NOT_EXHAUSTED_RANGE	22,300,080	22,300,060	-0.0%
_ITER_CHECK_RANGE	22,300,080	22,300,060	-0.0%
_GUARD_TYPE_VERSION	30,744,980	30,745,000	0.0%
_LOAD_FAST_4	30,869,080	30,869,100	0.0%
_SET_IP	247,220,400	247,220,540	0.0%
_CHECK_VALIDITY	229,559,440	229,559,560	0.0%
_CHECK_MANAGED_OBJECT_HAS_VALUES	77,514,740	77,514,740	0.0%
_LOAD_ATTR_INSTANCE_VALUE	77,514,740	77,514,740	0.0%
_LOAD_FAST	72,599,880	72,599,880	0.0%
_BINARY_OP_SUBTRACT_INT	57,600,000	57,600,000	0.0%
_BINARY_OP_MULTIPLY_FLOAT	43,200,000	43,200,000	0.0%
_BINARY_OP_ADD_INT	42,754,820	42,754,820	0.0%
_STORE_FAST	36,599,880	36,599,880	0.0%
_BINARY_SUBSCR_LIST_INT	36,115,580	36,115,580	0.0%
_MAKE_WARM	36,002,380	36,002,380	0.0%
_LOAD_SMALL_INT_1	32,644,440	32,644,440	0.0%
_BINARY_OP_EXTEND	28,800,000	28,800,000	0.0%
_GUARD_BINARY_OP_EXTEND	28,800,000	28,800,000	0.0%
_GUARD_NOS_FLOAT	28,800,000	28,800,000	0.0%
_GUARD_TOS_INT	22,044,360	22,044,360	0.0%
_BINARY_OP_ADD_FLOAT	21,600,000	21,600,000	0.0%
_LOAD_FAST_7	18,000,000	18,000,000	0.0%
_PUSH_FRAME	17,715,720	17,715,720	0.0%
_ITER_NEXT_RANGE	16,288,800	16,288,800	0.0%
_LOAD_FAST_5	15,600,000	15,600,000	0.0%
_GUARD_BOTH_FLOAT	15,599,760	15,599,760	0.0%
_LOAD_FAST_6	14,400,000	14,400,000	0.0%
_CHECK_FUNCTION	12,915,960	12,915,960	0.0%
_TIER2_RESUME_CHECK	10,790,540	10,790,540	0.0%
_SAVE_RETURN_OFFSET	10,515,720	10,515,720	0.0%
_CHECK_FUNCTION_VERSION	9,599,760	9,599,760	0.0%
_GUARD_DORV_VALUES_INST_ATTR_FROM_DICT	9,599,760	9,599,760	0.0%
_GUARD_KEYS_VERSION	9,599,760	9,599,760	0.0%
_LOAD_ATTR_METHOD_WITH_VALUES	9,599,760	9,599,760	0.0%
_DYNAMIC_EXIT	9,315,960	9,315,960	0.0%
_LOAD_CONST_INLINE	9,315,960	9,315,960	0.0%
_CHECK_FUNCTION_EXACT_ARGS	8,999,880	8,999,880	0.0%
_RESUME_CHECK	8,399,760	8,399,760	0.0%
_CHECK_STACK_SPACE_OPERAND	7,799,880	7,799,880	0.0%
_CHECK_AND_ALLOCATE_OBJECT	7,200,000	7,200,000	0.0%
_CREATE_INIT_FRAME	7,200,000	7,200,000	0.0%
_GUARD_IS_NOT_NONE_POP	7,200,000	7,200,000	0.0%
_INIT_CALL_PY_EXACT_ARGS_3	7,200,000	7,200,000	0.0%
_CALL_BUILTIN_CLASS	5,399,880	5,399,880	0.0%
_GET_ITER	4,800,000	4,800,000	0.0%
_GUARD_IS_TRUE_POP	3,777,840	3,777,840	0.0%
_LIST_APPEND	3,600,000	3,600,000	0.0%
_LOAD_SMALL_INT_2	3,600,000	3,600,000	0.0%
_STORE_FAST_7	3,600,000	3,600,000	0.0%
_GUARD_NOS_INT	2,999,880	2,999,880	0.0%
_LOAD_SMALL_INT_0	2,400,000	2,400,000	0.0%
_GUARD_IS_NONE_POP	1,799,880	1,799,880	0.0%
_COMPARE_OP	1,689,120	1,689,120	0.0%
_PY_FRAME_GENERAL	1,515,840	1,515,840	0.0%
_IS_OP	1,200,000	1,200,000	0.0%
_CHECK_STACK_SPACE	1,200,000	1,200,000	0.0%
_INIT_CALL_PY_EXACT_ARGS_1	1,200,000	1,200,000	0.0%
_STORE_FAST_5	1,200,000	1,200,000	0.0%
_STORE_FAST_6	1,200,000	1,200,000	0.0%
_BINARY_OP	1,199,760	1,199,760	0.0%
_BINARY_OP_SUBTRACT_FLOAT	1,199,760	1,199,760	0.0%
_CHECK_METHOD_VERSION	915,960	915,960	0.0%
_EXPAND_METHOD	915,960	915,960	0.0%
_INIT_CALL_PY_EXACT_ARGS_0	599,880	599,880	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%

Stats gathered on: 2025-02-06

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bm-20250206-azure-x86_64-brandtbucher-justin_compact_exits-3.14.0a4+-aa6e11c-pystats-chaos-vs-base.md

bm-20250206-azure-x86_64-brandtbucher-justin_compact_exits-3.14.0a4+-aa6e11c-pystats-chaos-vs-base.md

Execution counts

Pair counts

Predecessor/Successor Pairs

Specialization stats

BINARY_OP

BINARY_SUBSCR

CALL

COMPARE_OP

FOR_ITER

LOAD_ATTR

LOAD_GLOBAL

LOAD_SUPER_ATTR

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

JIT memory stats

JIT trace total memory histogram

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

Files

bm-20250206-azure-x86_64-brandtbucher-justin_compact_exits-3.14.0a4+-aa6e11c-pystats-chaos-vs-base.md

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History

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Execution counts

Pair counts

Predecessor/Successor Pairs

Specialization stats

BINARY_OP

BINARY_SUBSCR

CALL

COMPARE_OP

FOR_ITER

LOAD_ATTR

LOAD_GLOBAL

LOAD_SUPER_ATTR

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

JIT memory stats

JIT trace total memory histogram

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