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???????????? ???????[ 2011/11/21 11:47:26 ] ????????
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?????????????java?е????java?????????????????????C++?????????????????????java???????????????????????????????????????????????е???????????????????????????????????????????????????й??????????????????????static??????????????????е????????????????????????static??????
?????????????java??治???????java???????????????? System.gc()????????????????jvm?????????Щ???????????????????檔java??????????jvm??gc?????й漲gc??ι???????????????????????????????????gc???????????????????????????????????????
?????????У??????????????????java???????泬???????????????????????????????????????
???????й??????????????????????????(new)????????????????????黹(delete)?????????????????????????????????????????????????????????????????????????????????????????????????????????????ν????????????????????й?????????????????????????????????
??????????? ???
????JAVA????????????????????
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?????? ????(Stack)??????????е??
?????? ?????(Heap)??????????????
?????? ??????(Method Area)???е???????????????????Ρ????????????????????????????????????????????????????????
?????? ????????(Native Method Stack)?????????JNI?е???????????????漰??
??????Java???????????棬java??????????????????????????(????)???з?????Java?????(JVM)????д????????????е???ó??????????????ж???????????????????????????(Heap)?й??
??????????????????JAVA?????(JVM)??????Щ?????????????????????????????????????????????????alive????????б?????????????????????????????dead????????????????????????dead??????????????????????????????????????????????????????е??У?????????
????JVM????????????????????????(generational )?????????y???????????????(young generation)???????????????????minor collection???????????(old generation)??????????????????major collection??????????????GC????????????ж????????飬???????????????????????
????(Sun JVM 1.3 ???????????????????????????copying??scavenge????????????????????????????????????????????????????Ч????????????????????棬??????п????????????????minor collection???????????mark-compact??????????????????????????????????????棬????????????????????????????????????????????????Щ?????????????major collection. )
?????Щ?????????????????ж????????????????? iterators ??????????
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????????????????????????????????????????????????????????????????????顣?????????????????????????????JVM??????????????????????????GC(??????minor collection)????????????????dead?????????????????檔???GC??????Full GC?????
????JVM???????????????????(yong generation)(????????nursery???ж???)???????(old generation)??????????? ??Eden space(?????)??????????survivor spaces?????????????????????????ж??????? Eden space?????????????????????????? ?????? minor GC?????VM?????μ????????????Eden space????????????survivor spaces???С?????VM??????Щ????????survivor spaces ??????????? ?????????tenured?? space?С??? tenured generation ?????????????Full GC??Full GC?????????????????????????????е? live???????pemanet generation???????????????java?????????????????????????????????????????????
????????????????????????л??????????
???????????????????????????????????????????????????????????????????С?????????????????JConsole????????????????????????????????????????????????????????????????????ο????μ???????
????Tuning Garbage collection with the 5.0 HotSpot VM
????http://java.sun.com/docs/hotspot/gc/index.html
?????????????????棺
????Eden Space (heap)?? ????????????????????????
????Survivor Space (heap)???????????eden space?????о??????????????б?????????
????Tenured Generation (heap)?????????????? survivor space?????д???????????????
????Permanent Generation (non-heap): ????????????????(refective)???????????(class)?????(method)????Java???????????Щ?????????????????????????д???
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???·???
??????????????????
2023/3/23 14:23:39???д?ò??????????
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2021/9/17 15:19:29???·???????·
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2021/5/28 17:25:47??????APP??????????
2021/5/8 17:01:11