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Python Memory Management
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Junseong
December 15, 2021
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Python Memory Management
2021.12.15 스캐터랩 엔지니어링 세미나에서 발표한 Python Memory Management 발표자료 입니다.
Junseong
December 15, 2021
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Transcript
Python Memory Management ӣળࢿ (ML Research Engineer, Pingpong)
Python Memory Management ޖट ੌ ੌযզө?
Python Memory Management Name, Reference, Object 10 A name Reference
Object
Python Memory Management ޖट ੌ ੌযզө?
Python Memory Management Reference Count 10 A Reference Object B
Reference Count: 2 ࢜۽ чਸ Memory ী Allocation ೞח Ѫ ইצ ӝઓ Object ী Reference ୶о
Python Memory Management Delete Variable
Python Memory Management Reference Count 10 A Object B Reference
Count: 1 (-1) पઁ A Object о Dealloc غח Ѫ ইצ Reference ݅ ઁ
Python Memory Management if Reference Count == 0
Python Memory Management if Reference Count == 0 10 A
Object B Reference Count: 0 (-1) -> deallocation
Python Memory Management п ёо न Reference Count ܳ ٜҊ
Ҋ, ೧ Count о 0 غݶ dealloc
Python Memory Management Ӓۢ Garbage Collection ਃ হחѢ ইצоৈ??
ࢎप Python ীࢲח ਤ җਸ Reference Count based GC ۄҊ ࠗܰҊ णפ.
Cyclic Reference GC ઁݾ ఫझ
Python Memory Management ޖट ੌ ੌযզө?
[L] Python Memory Management Recursive Reference L Object Reference Count:
2 ۠ ࣽജ ଵઑ غয ח ҃ Reference Count ܳ ӝ߈ਵ۽ ೠ Deallocation ࠛоמೞ
[L] Python Memory Management Cyclic Reference L Object Reference Count:
1 : Name L ਸ ਕب ࣽജଵઑ غয ӝ ٸޙী Reference Count ח 0 غ ঋח => Memory Leak!
Python Memory Management GC for Cyclic Reference Python ীࢲ GCח
Cyclic Reference ܳ dealloc ೞחؘ ౠചغয णפ.
Python Memory Management GC for Cyclic Reference
Foo(0) Python Memory Management GC for Cyclic Reference A Object
Next Foo(1) B Next Foo(0) Ref Count : 2 Foo(1) Ref Count : 2
Python Memory Management GC Reference Count Object Reference Count GC_Reference
Count Reason Foo(0) 2 2 copy(refCnt) Foo(1) 2 2 copy(refCnt)
Python Memory Management Automated Garbage Collection Object Reference Count GC_Reference
Count Reason Foo(0) 2 1 Foo(1).next.gcRefCnt -= 1 Foo(1) 2 1 Foo(0).next.gcRefCnt -= 1 Nothing Happened!
Python Memory Management GC for Cyclic Reference
Foo(0) Python Memory Management GC for Cyclic Reference A Next
Foo(1) B Next Foo(0) Ref Count : 1 Foo(1) Ref Count : 1
Python Memory Management GC Reference Count Object Reference Count GC_Reference
Count Reason Foo(1) 1 1 copy(ref_count) Foo(2) 1 1 copy(ref_count) Reference Count ч Deep Copy
Python Memory Management GC Reference Count Object Reference Count GC_Reference
Count Reason Foo(0) 1 0 Foo(1).next.gcRefCnt -= 1 Foo(1) 1 0 Foo(0).next.gcRefCnt -= 1
Python Memory Management Cyclic Reference ী ೠ GC ࢿҕ!! Object
Reference Count GC_Reference Count Reason Foo(0) 1 0 Foo(1).next.gcRefCnt -= 1 Foo(1) 1 0 Foo(0).next.gcRefCnt -= 1 Dealloc Dealloc
GIL: Global Interpreter Lock Python Memory Management
Pythonਵ۽ ѐߊೞח ഥࢎٜ ױҎ ݶ ޙઁ > ॆীࢲ GIL ަөਃ?
Python Memory Management
Python Memory Management
Python Memory Management ୨ 3ѐ Reference Count о хࣗ غযঠ
ೞחؘ, Ѿҗਵ۽ח 2ѐ݅ хࣗؽ -> Race Condition Ѿҗਵ۽ memory leak ਸ ߊࢤदఃѢա ߈۽ ই ইযঠ ೡ objectܳ લৈߡܾ ࣻب .
Python Memory Management Ѧ ߑೞ۰ݶ ݽٚ Reference Count Operation ী
Lock ਸ Ѧݶ ؽ ೞ݅ Python Ѣ ݽٚ Operation ীࢲ Reference Count ܳ ೞӝ ٸޙী ח ষդ ࠺ബਯࢿਸ оઉ১
Python Memory Management Reference Counting ਸ ӝ߈ਵ۽ ೠ GC ܳ
ࢎਊೞח ҃ Thread-Safe ೧ঠ ೣ Ӓ Ѿҗ GIL ߆ী উ হח Ѫ…. -> Ӓېࢲ Java ח Mark and Sweep ߑध GC ܳ ࢎਊפ Ѥ ܲ ࠙..^^7
Python Memory Management
Python Memory Management ࢎप ݫݽܻ ҕрী ҙೠ ղਊب חؘ.. -
Pool, Block, Arena, Generation ١١… ۞р ೞܖઙੌ ೧ঠ ೧ࢲ ӝഥী..ƃƃ
Python Memory Management ࠗ۾: ৵ Python String Overhead о
חо? ॆ ‘ч’ۄח ѐ֛ হ ݽٚ Object - Reference Count - Type Info - Char Array (value) - Intern ച غয ח ৈࠗ - String Object Hash ч
хࢎפ✌ ୶о ޙ ژח ҾӘೠ ݶ ઁٚ ইې োۅ۽
োۅ ࣁਃ! ӣળࢿ (ML Research Engineer, Pingpong)
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