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Android 鏍稿績鐭ヨ瘑鐐圭瑪璁?PDF 涓嬭澆
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鐩稿叧鎴浘錛?/strong>
涓昏鍐呭錛?/strong>
1.1.5.1 瀵硅薄瀛樻椿鍒ゆ柇
飩?寮曠敤璁℃暟
姣忎釜瀵硅薄鏈変竴涓紩鐢ㄨ鏁板睘鎬э紝鏂板涓€涓紩鐢ㄦ椂璁℃暟鍔?1錛屽紩鐢ㄩ噴鏀炬椂璁℃暟鍑?1錛岃鏁頒負 0 鏃?/div>
鍙互鍥炴敹銆傛鏂規(guī)硶綆€鍗曪紝鏃犳硶瑙ｅ喅瀵硅薄鐩鎬簰寰幆寮曠敤鐨勯棶棰樸€?/div>
飩?鍙揪鎬у垎鏋?/div>
浠?GC Roots 寮€濮嬪悜涓嬫悳绱紝鎼滅儲鎵€璧拌繃鐨勮礬寰勭О涓哄紩鐢ㄩ摼銆傚綋涓€涓璞″埌 GC Roots 娌℃湁
浠諱綍寮曠敤閾劇浉榪炴椂錛屽垯璇佹槑姝ゅ璞℃槸涓嶅彲鐢ㄧ殑銆備笉鍙揪瀵硅薄銆?/div>
鍦?Java 璇█涓紝GC Roots 鍖呮嫭錛?/div>
飩?铏氭嫙鏈烘爤涓紩鐢ㄧ殑瀵硅薄銆?/div>
飩?鏂規(guī)硶鍖轟腑綾婚潤鎬佸睘鎬у疄浣撳紩鐢ㄧ殑瀵硅薄銆?/div>
飩?鏂規(guī)硶鍖轟腑甯擱噺寮曠敤鐨勫璞°€?/div>
飩?鏈湴鏂規(guī)硶鏍堜腑 JNI 寮曠敤鐨勫璞°€?/div>
1.1.5.2 鍨冨溇鏀墮泦綆楁硶
飩?鏍囪 -娓呴櫎綆楁硶
“鏍囪-娓呴櫎”錛圡ark-Sweep錛夌畻娉曪紝濡傚畠鐨勫悕瀛椾竴鏍鳳紝綆楁硶鍒嗕負“鏍囪”鍜?ldquo;娓呴櫎”涓や釜闃舵錛氶
鍏堟爣璁板嚭鎵€鏈夐渶瑕佸洖鏀剁殑瀵硅薄錛屽湪鏍囪瀹屾垚鍚庣粺涓€鍥炴敹鎺夋墍鏈夎鏍囪鐨勫璞°€備箣鎵€浠ヨ瀹冩槸
鏈€鍩虹鐨勬敹闆嗙畻娉曪紝鏄洜涓哄悗緇殑鏀墮泦綆楁硶閮芥槸鍩轟簬榪欑鎬濊礬騫跺鍏剁己鐐硅繘琛屾敼榪涜€屽緱鍒扮殑銆?/div>
瀹冪殑涓昏緙虹偣鏈変袱涓細涓€涓槸鏁堢巼闂錛屾爣璁板拰娓呴櫎榪囩▼鐨勬晥鐜囬兘涓嶉珮錛涘彟澶栦竴涓槸絀洪棿闂?/div>
棰橈紝鏍囪娓呴櫎涔嬪悗浼氫駭鐢熷ぇ閲忎笉榪炵畫鐨勫唴瀛樼鐗囷紝絀洪棿紕庣墖澶鍙兘浼氬鑷達紝褰撶▼搴忓湪浠ュ悗
鐨勮繍琛岃繃紼嬩腑闇€瑕佸垎閰嶈緝澶у璞℃椂鏃犳硶鎵懼埌瓚沖鐨勮繛緇唴瀛樿€屼笉寰椾笉鎻愬墠瑙﹀彂鍙︿竴嬈″瀮鍦炬敹
闆嗗姩浣溿€?/div>
飩?澶嶅埗綆楁硶
“澶嶅埗”錛圕opying錛夌殑鏀墮泦綆楁硶錛屽畠?yōu)畣鍙敤鍐呭瓨鎸夊畾w噺鍒掑垎涓哄ぇ灝忕浉絳夌殑涓ゅ潡錛屾瘡嬈″彧浣跨敤鍏?/div>
涓殑涓€鍧椼€傚綋榪欎竴鍧楃殑鍐呭瓨鐢ㄥ畬浜嗭紝灝卞皢榪樺瓨媧葷潃鐨勫璞″鍒跺埌鍙﹀涓€鍧椾笂闈紝鐒跺悗鍐嶆妸宸?/div>
浣跨敤榪囩殑鍐呭瓨絀洪棿涓€嬈℃竻鐞嗘帀銆?/div>
榪欐牱浣垮緱姣忔閮芥槸瀵瑰叾涓殑涓€鍧楄繘琛屽唴瀛樺洖鏀訛紝鍐呭瓨鍒嗛厤鏃朵篃灝變笉鐢ㄨ€冭檻鍐呭瓨紕庣墖絳夊鏉傛儏
鍐碉紝鍙縐誨姩鍫嗛《鎸囬拡錛屾寜欏哄簭鍒嗛厤鍐呭瓨鍗沖彲錛屽疄鐜扮畝鍗曪紝榪愯楂樻晥銆傚彧鏄繖縐嶇畻娉曠殑浠ｄ環(huán)
鏄皢鍐呭瓨緙╁皬涓哄師鏉ョ殑涓€鍗婏紝鎸佺畫澶嶅埗闀跨敓瀛樻湡鐨勫璞″垯瀵艱嚧鏁堢巼闄嶄綆銆?/div>
飩?鏍囪-鏁寸悊綆楁硶
澶嶅埗鏀墮泦綆楁硶鍦ㄥ璞″瓨媧葷巼杈冮珮鏃跺氨瑕佹墽琛岃緝澶氱殑澶嶅埗鎿嶄綔錛屾晥鐜囧皢浼氬彉浣庛€傛洿鍏抽敭鐨勬槸錛?/div>
濡傛灉涓嶆兂嫻垂 50%鐨勭┖闂達紝灝遍渶瑕佹湁棰濆鐨勭┖闂磋繘琛屽垎閰嶆媴淇濓紝浠ュ簲瀵硅浣跨敤鐨勫唴瀛樹腑鎵€鏈?/div>
瀵硅薄閮?100%瀛樻椿鐨勬瀬绔儏鍐碉紝鎵€浠ュ湪鑰佸勾浠ｄ竴鑸笉鑳界洿鎺ラ€夌敤榪欑綆楁硶銆?/div>
鏍規(guī)嵁鑰佸勾浠ｇ殑鐗圭偣錛屾湁浜烘彁鍑轟簡鍙﹀涓€縐?ldquo;鏍囪-鏁寸悊”錛圡ark-Compact錛夌畻娉曪紝鏍囪榪囩▼浠嶇劧
涓?ldquo;鏍囪-娓呴櫎”綆楁硶涓€鏍鳳紝浣嗗悗緇楠や笉鏄洿鎺ュ鍙洖鏀跺璞¤繘琛屾竻鐞嗭紝鑰屾槸璁╂墍鏈夊瓨媧葷殑瀵?/div>
璞￠兘鍚戜竴绔Щ鍔紝鐒跺悗鐩存帴娓呯悊鎺夌杈圭晫浠ュ鐨勫唴瀛樸€?/div>
飩?鍒嗕唬鏀墮泦綆楁硶
GC 鍒嗕唬鐨勫熀鏈亣璁撅細緇濆ぇ閮ㄥ垎瀵硅薄鐨勭敓鍛藉懆鏈熼兘闈炲父鐭殏錛屽瓨媧繪椂闂寸煭銆?/div>
“鍒嗕唬鏀墮泦”錛圙enerational Collection錛夌畻娉曪紝鎶?Java 鍫嗗垎涓烘柊鐢熶唬鍜岃€佸勾浠ｏ紝榪欐牱灝卞彲浠ユ牴
鎹悇涓勾浠ｇ殑鐗圭偣閲囩敤鏈€閫傚綋鐨勬敹闆嗙畻娉曘€傚湪鏂扮敓浠ｄ腑錛屾瘡嬈″瀮鍦炬敹闆嗘椂閮藉彂鐜版湁澶ф壒瀵硅薄
姝誨幓錛屽彧鏈夊皯閲忓瓨媧伙紝閭ｅ氨閫夌敤澶嶅埗綆楁硶錛屽彧闇€瑕佷粯鍑哄皯閲忓瓨媧誨璞＄殑澶嶅埗鎴愭湰灝卞彲浠ュ畬鎴?/div>
鏀墮泦銆傝€岃€佸勾浠ｄ腑鍥犱負瀵硅薄瀛樻椿鐜囬珮銆佹病鏈夐澶栫┖闂村瀹冭繘琛屽垎閰嶆媴淇濓紝灝卞繀欏諱嬌鐢?ldquo;鏍囪- 娓呯悊”鎴?ldquo;鏍囪-鏁寸悊”綆楁硶鏉ヨ繘琛屽洖鏀躲€?/div>
1.1.5.3 鍨冨溇鏀墮泦鍣?/div>
飩?CMS 鏀墮泦鍣?/div>
CMS錛圕oncurrent Mark Sweep錛夋敹闆嗗櫒鏄竴縐嶄互鑾峰彇鏈€鐭洖鏀跺仠欏挎椂闂翠負鐩爣
鐨勬敹闆嗗櫒銆傜洰鍓嶅緢澶т竴閮ㄥ垎鐨?Java 搴旂敤閮介泦涓湪浜掕仈緗戠珯鎴?B/S 緋葷粺鐨勬湇鍔＄
涓婏紝榪欑被搴旂敤灝ゅ叾閲嶈鏈嶅姟鐨勫搷搴旈€熷害錛屽笇鏈涚郴緇熷仠欏挎椂闂存渶鐭紝浠ョ粰鐢ㄦ埛甯?/div>
鏉ヨ緝濂界殑浣撻獙銆?/div>
浠庡悕瀛楋紙鍖呭惈“Mark Sweep”錛変笂灝卞彲浠ョ湅鍑?CMS 鏀墮泦鍣ㄦ槸鍩轟簬“鏍囪-娓呴櫎”綆楁硶瀹炵幇鐨勶紝瀹冪殑
榪愪綔榪囩▼鐩稿浜庡墠闈㈠嚑縐嶆敹闆嗗櫒鏉ヨ瑕佹洿澶嶆潅涓€浜涳紝鏁翠釜榪囩▼鍒嗕負 4 涓楠わ紝鍖呮嫭錛?/div>
飩?鍒濆鏍囪錛圕MS initial mark錛?飩?騫跺彂鏍囪錛圕MS concurrent mark錛?飩?閲嶆柊鏍囪錛圕MS remark錛?飩?騫跺彂娓呴櫎錛圕MS concurrent sweep錛?/div>
鍏朵腑鍒濆鏍囪銆侀噸鏂版爣璁拌繖涓や釜姝ラ浠嶇劧闇€瑕?ldquo;Stop The World”銆傚垵濮嬫爣璁頒粎浠呭彧鏄爣璁頒竴涓?/div>
GC Roots 鑳界洿鎺ュ叧鑱斿埌鐨勫璞★紝閫熷害寰堝揩錛屽茍鍙戞爣璁伴樁孌靛氨鏄繘琛?GC Roots Tracing 鐨勮繃紼嬶紝
鑰岄噸鏂版爣璁伴樁孌靛垯鏄負浜嗕慨姝ｅ茍鍙戞爣璁版湡闂達紝鍥犵敤鎴風▼搴忕戶緇繍浣滆€屽鑷存爣璁頒駭鐢熷彉鍔ㄧ殑閭?/div>
涓€閮ㄥ垎瀵硅薄鐨勬爣璁拌褰曪紝榪欎釜闃舵鐨勫仠欏挎椂闂翠竴鑸細姣斿垵濮嬫爣璁伴樁孌電◢闀夸竴浜涳紝浣嗚繙姣斿茍鍙?/div>
鏍囪鐨勬椂闂寸煭銆?/div>
鐢變簬鏁翠釜榪囩▼涓€楁椂鏈€闀跨殑騫跺彂鏍囪鍜屽茍鍙戞竻闄よ繃紼嬩腑錛屾敹闆嗗櫒綰跨▼閮藉彲浠ヤ笌鐢ㄦ埛綰跨▼涓€璧?/div>
宸ヤ綔錛屾墍浠ユ€諱綋涓婃潵璇達紝CMS 鏀墮泦鍣ㄧ殑鍐呭瓨鍥炴敹榪囩▼鏄笌鐢ㄦ埛綰跨▼涓€璧峰茍鍙戝湴鎵ц銆傝€佸勾浠?/div>
鏀墮泦鍣紙鏂扮敓浠ｄ嬌鐢?ParNew錛?br />
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