緋葷粺鏈夋椂浼氶亣鍒癘utOfMemoryError錛孞ava鍫嗘孩鍑轟簡銆傛垜浠渶瑕佹壘鍒伴犳垚OutOfMemoryError鍘熷洜銆備竴鑸湁涓ょ鎯呭喌錛?/font>
1銆佸唴瀛樻硠闇詫紝瀵硅薄宸茬粡姝諱簡錛屾棤娉曢氳繃鍨冨溇鏀墮泦鍣ㄨ繘琛岃嚜鍔ㄥ洖鏀訛紱
2銆佸唴瀛樻孩鍑猴紝鍐呭瓨涓殑瀵硅薄閮借繕蹇呴』瀛樻椿鐫錛岃繖璇存槑Java鍫嗗垎閰嶇┖闂翠笉瓚籌紝媯鏌ュ爢璁劇疆澶у皬錛?Xmx涓?Xms錛夛紝媯鏌ヤ唬鐮佹槸鍚﹀瓨鍦ㄥ璞＄敓鍛藉懆鏈熷お闀褲佹寔鏈夌姸鎬佹椂闂磋繃闀跨殑鎯呭喌銆?/font>
鎯沖湪娉勬紡鏈彂鐢熷墠錛屽彇鍫嗚漿鍌ㄦ枃浠跺垎鏋愶紝 閫氳繃jvm鍙傛暟-XX:+HeapDumpOnOutOfMemoryError錛圶X:+HeapDumpOnCtrlBreak涓嶇煡閬撲負浠涔坱omcat鍚姩涓嶄簡錛夊彲浠ヨJVM鍦ㄥ嚭鐜板唴瀛樻孩鍑烘槸Dump鍑哄綋鍓嶇殑鍐呭瓨杞偍蹇収銆?/font>
褰撶劧涔熷彲浠ラ氳繃鐢╦map鐢熶駭dump鏂囦歡銆倃indows閫氳繃浠誨姟綆＄悊鍣ㄦ煡鐪媡omcat鐨勮繘紼媝id錛宭inux鐢╬s鍛戒護鏌ョ湅榪涚▼pid錛岀劧鍚庣敤jmap鍛戒護錛圝ava5錛歫map -heap:format=b <pid>錛汮ava6錛歫map -dump:format=b,file=HeapDump.bin <pid>錛?/font>
鍦╰omcat涓緗甹vm鍙傛暟
linux緋葷粺涓?/font>
1.鎵撳紑/tomcat_home/bin/catalina.sh鏂囦歡
2.鍔犱笂錛欽AVA_OPTS="$JAVA_OPTS -server -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=D:\heapdump"
濡備笅鍥句綅緗細
娉細鍏朵腑涓嶈-XX:HeapDumpPath鏃訛紝dump鍑虹殑鏂囦歡鍦?tomcat_home/bin鐩綍涓?/font>
Windows緋葷粺涓?/font>
1.鎵撳紑/tomcat_home/bin/catalina.bat鏂囦歡
2.鍔犱笂錛歴et JAVA_OPTS=%JAVA_OPTS% -server -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=D:\heapdump
濡備笅鍥句綅緗細
鍒嗘瀽dump鍑烘潵鐨勫唴瀛樺揩鐓ф枃浠?/font>
鍙互浣跨敤鍒嗘瀽宸ュ叿榪涜鍒嗘瀽錛屽錛?/font>
Eclipse鐨凪AT
涓嬭澆鍦板潃錛歨ttp://www.eclipse.org/mat/downloads.php
璇存槑鏂囨。錛歨ttp://www.vogella.com/articles/EclipseMemoryAnalyser/article.html#example_project
娉ㄦ剰錛氳В鏋愯繃澶х殑HeapDump鍙兘瀵艱嚧Eclipse鎶涘嚭OutOfMemory鐨勯敊璇傝繖鏃朵綘闇瑕佹墜鍔ㄨ皟鏁碋clipse鐨勭紦瀛樺ぇ灝忥紝鍙互鍙傝冨畼緗戠粰鍑虹殑澶勭悊鏂瑰紡錛?a target="_blank">鍘熸枃榪炴帴錛?/p>
Alternatively, edit the MemoryAnalyzer.ini to contain:
-vmargs
-Xmx2g
-XX:-UseGCOverheadLimit
Eclipse鎻掍歡鐗堟墦涓嶅紑鐨勬湅鍙嬪彲浠ヨ瘯璇?RPC鐗堢殑MAT 錛?span style="color: #ff0000">鎴戠殑232m鐨刣ump鏂囦歡涔熸墦涓嶅紑錛岄毦閬撻潪寰楃敤64bit鐨勬満鍣ㄥ悧錛?/span>錛夛細RPC鐗圡AT涓嬭澆鍦板潃 銆?/font>
JProfile
絳夌瓑錛?br />
杞嚜錛?a >http://jiangsha.iteye.com/blog/1576355
]]>
Sun JDK鍦ㄥ疄鐜版椂閬電収JVM瑙勮寖錛屽皢鍐呭瓨絀洪棿鍒掑垎涓烘柟娉曞尯銆佸爢銆佹湰鍦版柟娉曟爤銆丳C瀵勫瓨鍣ㄣ乯vm鏂規(guī)硶鏍堛?br />鏂規(guī)硶鍖?br /> 鏂規(guī)硶鍖轟富瑕佸瓨鏀捐鍔犺澆鐨勭被鐨勪俊鎭紝姣斿綾葷殑鍚嶇О銆佺被鐨勪慨楗扮銆佺被涓殑闈欐佸彉閲忋乫inal綾誨瀷鐨勫父閲忋乫ield銆乵ethod絳変俊鎭傛柟娉曞尯鏄嚎紼嬪叡浜殑錛屽湪涓瀹氭潯浠朵笅涔熶細琚獹C,褰撴柟娉曞尯瑕佷嬌鐢ㄧ殑鍐呭瓨瓚呰繃鍏跺厑璁哥殑澶у皬鏃訛紝浼氭姏鍑篛utOfMemory鐨勯敊璇俊鎭?br /> 鏂規(guī)硶鍖虹殑瀛樺偍鍖哄煙瀵瑰簲Permanet Generation(鍙堢О錛屾寔涔呬唬)錛屽叾榛樿鍊間負{16MB-64MB},瀹冪殑澶у皬鍙互閫氳繃濡備笅閫夐」榪涜璋冩暣錛?br /> 鏈灝忓?span style="color: red">錛?XX:PermSize
鏈澶у?span style="color: red">錛?XX:MaxPermSize
鍫?br /> 鍫嗙敤浜庡瓨鍌ㄦ柊鍒涘緩鐨勫璞″拰鏁扮粍銆傚叾澶у皬鍙互閫氳繃濡備笅閫夐」榪涜璋冩暣錛?br /> 鏈灝忓?span style="color: red">錛?Xms
鏈澶у?span style="color: red">錛?Xmx
涓轟簡璁╁唴瀛樺洖鏀舵洿鏈夋晥鐜囷紝Sun JDK浠?.2寮濮嬪鍫嗛噰鐢ㄥ垎浠ｇ鐞嗙殑鏂瑰紡銆?br /> heap = New Generation (鏂扮敓浠?+ Old Generation錛堟棫鐢熶唬錛?br /> 鍏朵腑錛孨ew Generation鍙堝彲浠ュ垎涓?strong>Eden Space鍜?strong>Survivor Space錛岃孲urvivor Space鐢變袱鍧楀ぇ灝忕浉鍚岀殑鍖哄煙緇勬垚(閫氬父縐頒負S0銆丼1)銆傞偅涔堬紝Eden Space銆丼0銆丼1鐢ㄩ斾笂鏈変粈涔堝尯鍒悧錛熷厛鏉ヨ璇碋den Space錛岀敱浜庡爢鏄嚎紼嬪叡浜殑錛屽洜姝ゅ湪鍫嗕笂鍒嗛厤鍐呭瓨鏄渶瑕佸姞閿佺殑錛岃繖灝卞鑷村垱寤哄璞″紑閿澧炲ぇ錛孲un JDK涓轟簡鎻愬崌鍐呭瓨鍒嗛厤鐨勬晥鐜囷紝浼氫負姣忎釜綰跨▼鍦ㄦ柊鐢熶唬鐨凟den Space涓婂垎閰嶄竴鍧楃嫭绔嬬殑絀洪棿錛岃繖鍧楃┖闂村彨鍋歍LAB(Thread Local Allocation Buffer)錛屽洜姝den Space鏄涓嚎紼嬬嫭浜殑榪炵畫鐨勫唴瀛樺尯鍩燂紝鍦ㄤ竴涓嚎紼嬪唴鍒涘緩瀵硅薄錛孞VM棣栧厛鑰冭檻鍦‥den Space鐨凾LAB涓婂垎閰嶏紝濡傛灉瀵硅薄榪囧ぇ鎴栬匱LAB絀洪棿宸茬敤瀹岋紝閭ｄ箞灝嗗湪鍫嗕笂鍒嗛厤銆係0銆丼1涔熺敤浜庢柊鍒涘緩瀵硅薄鐨勫瓨鍌紝浠栦滑鐨勫彟澶栦竴涓敤閫旀槸鍦℅C鏃剁殑涓存椂澶嶅埗絀洪棿銆?br /> 鏂扮敓浠ｅぇ灝忓?span style="color: red">錛?Xmn
Survivor Space澶у皬錛?XX錛歋urvivorRatio
鏃х敓浠ｄ富瑕佸瓨鏀懼嬈C鍚庝粛鐒跺瓨?gòu)z葷殑瀵硅薄錛屼笉榪囷紝鏂板緩鐨勫璞′篃鏈夊彲鑳藉湪鏃х敓浠ｄ笂鍒嗛厤銆備竴縐嶆槸澶у璞★紙-XX錛歅retenureSizeThreshold鏉ョ‘瀹氾級錛屽彟涓縐嶆槸澶ф暟緇勶紝涓旀暟緇勬湭寮曠敤澶栭儴瀵硅薄銆傛棫鐢熶唬澶у皬錛?br /> 鏃х敓浠ｅぇ灝忓?-Xmx 鍑忓幓 -Xmn
JVM鏂規(guī)硶鏍?br /> JVM鏂規(guī)硶鏍堟槸綰跨▼縐佹湁鐨勶紝鍏跺湪鍐呭瓨鍒嗛厤涓婇潪甯擱珮鏁堛傚綋JVM鏂規(guī)硶鏍堢┖闂翠笉瓚蟲椂錛屼細鎶涘嚭StackOverflowError鐨勯敊璇侸VM鏂規(guī)硶鏍堝彲閫氳繃濡備笅閫夐」榪涜璋冩暣錛?br /> JVM鏂規(guī)硶鏍堝ぇ灝?span style="color: red">錛?Xss
]]>