javascriptのGC入門

javascriptのGCの特徴やどのように動作するかの解説

Transcript

1. javascript Garbage Collector Overview
2. せ⵸: @brn (ꫬꅿ⨳ⵃ) 耵噟: ؿٗٝزؒٝسؒٝآص،٥iOSؒٝآص، ⠓爡: Cyberagent ،سذؙأةآؔ
   RightSegment٥AI Messenger ـؚٗ: http://abcdef.gets.b6n.ch/
3. What is Garbage Collector? Garbage Collectorהכծفؚٗٓي⚥חⶴ׶䔲ג׵׸׋ؔـآؙؑزך
   灶唱׾遤ְծًٌٔ걄㚖׾然⥂׃湫ׅ׮ךկ
   
4. What is Garbage Collector? var x = { a: 1, b: 2 } Object Field a Field b Other Objects Heap ًٌٔⶴ׶䔲ג
   
5. What is Heap? Stack ꟼ侧 = ⠓陽
   Heap مٙ؎زن٦س
   陽✲ꐮ
   
6. What is Heap? Stackכꟼ侧⽃⡘דⶴ׶䔲ג׵׸ծꟼ侧ָ穄✪ׅ׷ה荈⹛ד灶唱ׁ׸ג׃ת ֲկ Heapכفؚٗٓيָ㶷㖈׃גְ׷꟦כ䌢ח⦼׾⥂㶷׃גֶֽ׷կ javascriptכ䌢חHeapח⦼׾ⶴ׶䔲ג׷♳ծStackכ湫䱸ׁ׻׸זְךדծ 罋ִ׷䗳銲כזְկ
   
7. What is Heap? Stack Process Stack Heap Process Stack Heap Process 饯⹛儗
   㹋遤⚥
   㹋遤⚥(㣐ꆀⶴ׶䔲ג)
   
8. What is Heap? OUT OF MEMORY
9. Garbage Collector 㟓ִֺׅ׋Heapכ铩ַָ䰾ꤐ׃זֽ׸לְֽזְկ ׉׸׾׃גֻ׸׷ךָ Garbage Collector
   
   
10. Garbage Collector
    
    ًٌٔⶴ׶䔲ג
    var x = {} var y = {} Heap Global x y
11. Garbage Collector
    
    Garbage CollectorָHeapךⵋ麦〳腉זؔـآؙؑزחو٦ؙ׾➰ֽ׷
    Heap Global x y
12. Garbage Collector
    
    ًٌٔⶴ׶䔲ג
    var x = {} var y = {} y = null Heap Global x y
13. Garbage Collector
    
    Garbage CollectorָHeapךⵋ麦〳腉זؔـآؙؑزחو٦ؙ׾➰ֽ׷
    Heap Global x y
14. Garbage Collector
    
    ًٌٔⶴ׶䔲ג
    var x = {}; var y = {x: x}; x = null y.x = null Heap Global x y
15. Garbage Collector
    
    Garbage CollectorָHeapךⵋ麦〳腉זؔـآؙؑزחو٦ؙ׾➰ֽ׷
    Heap Global x y
16. Garbage Collector
    
    ًٌٔⶴ׶䔲ג
    var x = {}; var y = {x: x}; x = null y = null Heap Global x y
17. Garbage Collector
    
    Garbage CollectorָHeapךⵋ麦〳腉זؔـآؙؑزחو٦ؙ׾➰ֽ׷
    Heap Global x y
18. Garbage Collector
    
    Heap Global x y Garbage CollectorָHeapךو٦ָؙזְؔـآؙؑز׾灶唱ׅ׷
    
19. Garbage Collector
    
    Garbage CollectorָHeapךⵋ麦〳腉זؔـآؙؑز׾و٦ؙ و و٦ ٦ؙ ؙؿ ؿؑ ؑ؎ ؎ؤ ؤ(Mark Phase) Garbage CollectorָHeapךⵋ麦♶〳腉זؔـآؙؑز׾灶唱 أ أؐ ؐ؍ ؍٦ ٦ف فؿ ؿؑ ؑ؎ ؎ؤ ؤ(Sweep Phase)
20. Garbage Collector
    
    ֿ׸ָ و و٦ ٦ؙ ؙ، ،ٝ ٝس سأ أؐ ؐ؍ ؍٦ ٦ف ف(Mark And Sweep) הְֲ،ٕ؞ٔؤيדׅկ
21. Garbage Collector
    
    ׋׌׃ծֿךMarkPhaseהSweepPhaseכ ؔـآؙؑزךخٔ٦׾׋ו׷ךדծفؚٗٓيך؟؎ؤח״׏גכծ ꬊ䌢ח頾蚚ַַָ׶תׅկ ׉ך׋׭ծ植㖈ךـٓؐؠדכֿ׸׵ך⹛⡲׾㼰׃בא遤ֲծ ؎ ؎ٝ ؙٝ ؙٔ ًٔ ًٝ ٝة ةٕ ٕGC(Incremental GC) הㄎל׸׷䩛岀ָ欽ְ׵׸גְתׅկ ׍ז׫חMark&Sweepדفؚٗٓيָ⨡姺׃ג׃תֲֿה׾ Stop the world הㄎןתׅկ
22. Incremental Garbage Collection Garbage CollectorָHeapךⵋ麦〳腉זؔـآؙؑزחو٦ؙ׾➰ֽ׷
    Heap Global x y 中断
23. Incremental Garbage Collection Garbage CollectorָHeapךو٦ָؙזְؔـآؙؑز׾灶唱ׅ׷
    Heap Global x y 中断
24. Incremental Garbage Collection Incremental GCכMark Phaseך鷿⚥ד⿫撑ָ㢌⻉ׅ׷〳腉䚍ָ֮׷׋׭ծ ٓ؎زغٔ،(WriteBarrier) ה״ל׸׷ծ⿫撑ָ剅ֹ㢌׻׏׋ֿה׾嗚濼ׅ׷➬穈׫ָ䗳銲חז׶תׅկ
25. Incremental Garbage Collection var x = {} var y = {} y.x = x; Object(x) Heap Object(y) WRITED
26. Incremental Garbage Collection Garbage CollectorכWriteBarrierח״׏גو٦ׁؙ׸׋ؔـآؙؑزכ灶唱דֹזְ
    Heap Global x y 中断 WRITED 削除しない
27. Incremental Garbage Collection Incremental GCכفؚٗٓيך⨡姺儗꟦׾䫇ִ׷׋׭ך،ٕ؞ٔؤيד֮׶ծ GC荈⡤ך儗꟦כⰋ⡤涸ח⠼ןתׅկ ָծ⡤䠬ך鸞䏝כֶ׉׵ֻ傍ֻ䠬ׄתׅկ
    
28. Summary ֿך项俱כꬊ䌢ח邌꬗涸ז铡僇דׅկ 劤勻GCכꬊ䌢ח醱꧟דծ➂겲ך〝兰ך穠兪הד׮ְֲ״ֲז׮ךזךדծ 莆㄂ָ֮׷倯כ׮׏ה帾ֻ锃ץג׫גֻ׌ְׁկ ֮הծhttps://github.com/authorNari/minigcח449遤ךminiGCהְֲꬊ䌢؝ٝ ػؙزז㹋鄲ָ֮׷ךדծ鋅ג׫גֻ׌ְׁկ ֿ׍׵ך ؖك٦آ؝ؙٖءّٝך،ٕ؞ٔؤيה㹋鄲הְֲ劤ֶָׅׅ׭דׅկ https://www.amazon.co.jp/%E3%82%AC%E3%83%99%E3%83%BC%E3%82%B8%E3%82%B3%E3%83%AC %E3%82%AF%E3%82%B7%E3%83%A7%E3%83%B3%E3%81%AE%E3%82%A2%E3%83%AB %E3%82%B4%E3%83%AA%E3%82%BA%E3%83%A0%E3%81%A8%E5%AE%9F%E8%A3%85-%E4%B8%AD%E6%9D %91-%E6%88%90%E6%B4%8B/dp/4798025623
29. ׀ ׀幠 幠耮 耮֮ ֮׶ ׶ָ ָה הֲ ֲ׀ ׀ׂ ְׂ ְת ת׃ ׃׋ ׋ 