{"id":1569,"date":"2008-02-22T22:51:54","date_gmt":"2008-02-22T13:51:54","guid":{"rendered":"http:\/\/apollo89.com\/wordpress\/?p=1569"},"modified":"2013-02-13T22:52:52","modified_gmt":"2013-02-13T13:52:52","slug":"java-virtual-machine%ec%9d%98-%eb%a9%94%eb%aa%a8%eb%a6%ac-%ea%b4%80%eb%a6%ac","status":"publish","type":"post","link":"https:\/\/apollo89.com\/wordpress\/?p=1569","title":{"rendered":"Java Virtual Machine\uc758 \uba54\ubaa8\ub9ac \uad00\ub9ac"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>Java Virtual Machine\uc758 \uba54\ubaa8\ub9ac \uad00\ub9ac<\/p>\n<p>\uc804\ud1b5\uc801\uc778 C\uc5b8\uc5b4\ub098 C++\uc5b8\uc5b4\uc640\ub294 \ub2ec\ub9ac \uc790\ubc14\uc5d0\uc11c\ub294 \uba54\ubaa8\ub9ac \uad00\ub9ac\ub294 \ud504\ub85c\uadf8\ub798\uba38\uac00 \uc77c\uc77c\uc774 \ud558\uc9c0 \uc54a\uace0 JVM\uc5d0\uc11c \uc54c\uc544\uc11c \uad00\ub9ac \ud574 \uc90d\ub2c8\ub2e4.(\ubb3c\ub860 \ub2f7\ub137\uc758 \uacbd\uc6b0\uc5d4 \uc790\ubc14\uc640 \ube44\uc2b7\ud55c \ubc29\ubc95\uc73c\ub85c \ud558\uc9c0\ub9cc)<\/p>\n<p>\uba54\ubaa8\ub9ac \uad00\ub9ac\ub780 \ud06c\uac8c \ubcf4\uba74 \uc0dd\uc131\/\uc18c\uba78(\uc0ad\uc81c, \ubc18\ub0a9)\uc758 \uacfc\uc815\uc73c\ub85c \uc0dd\uac01 \ud560 \uc218 \uc788\ub294\ub370 \uc6b0\ub9ac\uac00 \uc790\ubc14 \ud504\ub85c\uadf8\ub7a8\uc5d0\uc11c Hello h = new Hello(\u201c\ubc29\uac00\ubc29\uac00\u201d) \ub77c\uace0 \ud558\ub4e0\uc9c0 \uc544\ub2d8 int i=10; \uc774\ub77c\uace0 \ud560 \ub54c \uba54\ubaa8\ub9ac\uc758 \uc77c\uc815 \ubd80\ubd84\uc744 \ud560\ub2f9 \ubc1b\uac8c \ub418\ub294 \uac83\uc785\ub2c8\ub2e4. \uba54\ubaa8\ub9ac\uc5d0\uc11c \ud560\ub2f9\uc774 \ud544\uc694\ud574\uc9c0\uba74 JVM\uc740 \ubcc0\uc218\uc5d0 \ub300\ud574 \uc2e4\uc81c\uc758 \ub0b4\uc6a9\uc744 \ud3ec\uc778\ud130\ub85c\uc368 \uad00\ub9ac\ub97c \ud574\uc8fc\uac8c \ub429\ub2c8\ub2e4. JVM\uc774 \ubaa8\ub4e0 \uac1d\uccb4\uc758 \ub808\ud37c\ub7f0\uc2a4\ub97c(\ucc38\uc870) \uce74\uc6b4\ud2b8\ud558\uace0 \uad00\ub9ac\ud558\uae30 \ub54c\ubb38\uc5d0 \uba54\ubaa8\ub9ac \uc601\uc5ed\uc758 \ucda9\ub3cc\uc774\ub098 \uc0ad\uc81c \ud558\uc9c0 \uc54a\uc740 \uba54\ubaa8\ub9ac \ub54c\ubb38\uc5d0 memory leak\ub4f1\uc774 \ubc1c\uc0dd \ud560 \uac00\ub2a5\uc131\uc774 \uac70\uc758 \uc5c6\uc5b4 \uc84c\uc2b5\ub2c8\ub2e4.<\/p>\n<p>HOT SPOT\uc774\uc804\uc758 JVM(JIT\uae30\ubc18, JDK1.3 \uc774\uc804)\uc5d0\uc11c\ub294 \uba54\ubaa8\ub9ac\uc5d0 \ub300\ud55c \uac04\uc811 \ucc38\uc870 \ubc29\uc2dd\uc744 \uc774\uc6a9\ud558\uc600\ub294\ub370 \uc544\uc2dc\ub294 \uac83 \ucc98\ub7fc \uac04\uc811 \ubc29\uc2dd\uc774\ubbc0\ub85c \uc2e4\uc81c \ub0b4\uc6a9\uc744 \ucc3e\uc544 \uac00\uae30 \uc704\ud574\uc11c\ub294 \ub450\ubc88\uc774\uc0c1\uc758 \ucc38\uc870\uac00 \uc77c\uc5b4\ub098\uac8c \ub429\ub2c8\ub2e4. \ubb3c\ub860 \uc870\uae08\uc740 \ub290\ub824\uc9c8 \uc18c\uc9c0\uac00 \uc788\uc5c8\uaca0\uc9c0\uc694~ \uc774 \uacbd\uc6b0\uc5d4 \uc624\ud788\ub824 Garbage Collection\uc2dc\uc5d0\ub294 \ucc38\uc870\ub9cc \uc9c0\uc6b0\uba74 \ub418\ubbc0\ub85c \uc624\ud788\ub824 \uac04\ub2e8\ud588\ub2e4\uace0 \ubcfc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n<p>\uac04\uc811 \ucc38\uc870\ub780 \ud799\uc5d0 \uac1d\uccb4\uc758 \ub0b4\uc6a9\uc774 \uc788\ub2e4\uba74 \uc911\uac04\uc5d0 \uadf8\uacf3\uc744 \uac00\ub9ac\ud0a4\ub294 \uba54\ubaa8\ub9ac \uc601\uc5ed\uc774 \uc788\uace0(\ud578\ub4e4 \uba54\ubaa8\ub9ac) \uc2a4\ud0dd\uc5d0 \uc788\ub294 \ubcc0\uc218\uac00 \ud578\ub4e4 \uba54\ubaa8\ub9ac\ub97c \ucc38\uc870\ud574\uc11c \uc2e4\uc81c \ud799\uc758 \uc8fc\uc18c\ub97c \uc5bb\uc740 \ud6c4 \ud799\uc758 \uc2e4\uc81c \ub0b4\uc6a9\uc744 \ucc38\uc870\ud558\uac8c \ub418\ub294 \ubc29\uc2dd \uc785\ub2c8\ub2e4. \ubc18\uba74 \uc9c1\uc811 \ucc38\uc870\uc758 \uacbd\uc6b0 \uc2a4\ud0dd\uc5d0 \uc788\ub294 \ubcc0\uc218\uac00 \ud799\uba54\ubaa8\ub9ac\uc758 \uc2e4\uc81c \uc8fc\uc18c\ub97c \uac00\uc9c0\uace0 \uc788\uc5b4 \uc9c1\uc811 \ucc38\uc870 \ud558\uac8c \ub418\ub294 \ubc29\uc2dd \uc785\ub2c8\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc790\uc8fc \ucc38\uc870\ub418\ub294 \ubcc0\uc218\ub098 \uac1d\uccb4\uac00 \uc788\ub2e4\uba74 \uc9c1\uc811 \ucc38\uc870 \ubc29\uc2dd\uc774 \ud6e8\uc52c \ub6f0\uc5b4\ub09c \uc131\ub2a5\uc744 \ubcf4\uc785\ub2c8\ub2e4.<\/p>\n<p>\ubc18\uba74\uc5d0 \uac00\ube44\uc9c0\uceec\ub809\uc158\uc758 \uacbd\uc6b0(\uba54\ubaa8\ub9ac\ub97c \uc9c0\uc6b0\uac70\ub098 \ucc38\uc870\uac12\uc744 \ubc14\uafb8\ub294 \uacbd\uc6b0) \uc9c1\uc811 \ucc38\uc870 \ubc29\uc2dd\uc5d0\uc11c\ub294 \uac12\uc774 \uc5c6\uc5b4\uc9c0\uac70\ub098 \uc0ac\ub77c\uc838\uc57c \ud558\ub294 \ubcc0\uc218\uc5d0 \ub300\ud574 \uc77c\uc77c\uc774 \ud3ec\uc778\ud130\ub97c \uc9c0\uc6cc\uc918\uc57c \ud569\ub2c8\ub2e4. \ubc18\uba74 \uac04\uc811 \ucc38\uc870 \ubc29\uc2dd\uc758 \uacbd\uc6b0 \ud578\ub4e4 \uba54\ubaa8\ub9ac\ub9cc \uc218\uc815\uc744 \ud574\uc8fc\uba74 \ub418\ubbc0\ub85c \uc624\ud788\ub824 \uac04\ub2e8\ud574 \uc9c0\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n<p>Virtual Machine\uc5d0\uc11c\ub294 \uc2a4\ud0dd\uacfc \ud799 \uba54\ubaa8\ub9ac\ub97c \uc0ac\uc6a9\ud558\uba70 \uc2a4\ud0dd\uc5d0\ub294 \ud504\ub85c\uadf8\ub7a8\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \ubcc0\uc218, \ud568\uc218\uba85\ub4f1\uc774 \uc218\ud589 \uc21c\uc11c\uc5d0 \ub9de\uac8c \uc801\uc7ac \ub418\uc5b4 \uc788\uace0 \ud799 \uba54\ubaa8\ub9ac\uc5d0\ub294 \uc2e4\uc81c \uc2a4\ud0dd\uc5d0 \uc788\ub294 \ubcc0\uc218\ub098 \ud568\uc218\uc758 \ub0b4\uc6a9\uc774 \uc801\uc7ac \ub429\ub2c8\ub2e4. \uc989 \uc2a4\ud0dd\uc5d0\ub294 \uc2e4\uc81c \uac12\uc774 \uc874\uc7ac\ud558\ub294 \uacf3\uc758 \ud3ec\uc778\ud130\ub97c \uac00\uc9c0\ubbc0\ub85c \ud06c\uae30\uac00 \ud06c\uc9c0 \uc54a\uc73c\ub098 \ud799\uc758 \uacbd\uc6b0 \uc0ac\uc6a9\ub7c9\uc774 \ucee4\uc9c0\uac8c \ub429\ub2c8\ub2e4. \ub9cc\uc57d \ud799 \uba54\ubaa8\ub9ac\ub97c \ub2e4\uc368\ubc84\ub9b0 \ub2e4\uba74 java.lang.OutOfMemory \uc624\ub958\uac00 \ubc1c\uc0dd \ud560\uac81\ub2c8\ub2e4.<\/p>\n<p>\uc774\ubc88\uc5d0\ub294 \uba54\ubaa8\ub9ac\uc758 \ud574\uc81c\uc5d0 \ub300\ud574 \ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4. \uc544\uae4c \uc704\uc5d0\uc11c \ub9cc\ub4e0 \uac1d\uccb4 \ucc38\uc870\ubcc0\uc218\uc5d0 \ub300\ud574 h = null; \uc774\ub77c\uace0 \ud558\ub294 \uacbd\uc6b0\ub098 \uc5b4\ub5a4 \uba54\uc18c\ub4dc \uc548\uc5d0 \uc4f0\uc778 \ubcc0\uc218\uac00 \uba54\uc18c\ub4dc\uc758 \uc2e4\ud589\uc774 \uc885\ub8cc\ud558\uac8c \ub418\ub294 \uacbd\uc6b0\uc5d0 \uba54\ubaa8\ub9ac\uc5d0\uc11c \ud574\uc81c \ub420 \uac83 \uc785\ub2c8\ub2e4.<\/p>\n<p>JVM\uc758 \ud799\uba54\ubaa8\ub9ac\uc5d0\ub294 \ud504\ub85c\uadf8\ub7a8 \uc2e4\ud589\uc2dc \uc0dd\uc131\ub41c \uc5ec\ub7ec \uac12\ub4e4\uc774 \uc874\uc7ac \ud569\ub2c8\ub2e4. \uac00\ube44\uceec\ub809\ud130\uac00 \ud558\ub294 \uc77c\uc740 \uc774\ub7ec\ud55c \ud799 \uba54\ubaa8\ub9ac\uc911 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\ub294 \uba54\ubaa8\ub9ac\ub97c \ubc18\ud658 \uc2dc\ud0a4\ub294 \uc5ed\ud560\uc744 \ud558\ub294 \uac83\uc785\ub2c8\ub2e4. \u00a0\uc704\uc758 \uacbd\uc6b0 \ucc98\ub7fc h = null; \uc774\ub77c\uace0 \uba85\uc2dc\uc801\uc73c\ub85c \uc9c0\uc815 \ud558\ub294 \uacbd\uc6b0 \uac1d\uccb4 \ud5e4\ub354\uc5d0 \uc874\uc7ac\ud558\ub294 GC(Garbage Collector) \ud544\ub4dc\uac00 \uac12\uc774 \uc124\uc815 \ub429\ub2c8\ub2e4. \uc774\ub807\uac8c \uc9c0\uc815 \ub41c \uac1d\uccb4\uc5d0 \ub300\ud574 \uc6b0\uc120\uc801\uc73c\ub85c \uba54\ubaa8\ub9ac\uc5d0\uc11c \uc0ad\uc81c\ub97c \ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n<p>\ubc18\uba74 \uc2a4\ucf54\ud504\ub97c \ubc97\uc5b4\ub098\ub294 \uacbd\uc6b0 Local \ubcc0\uc218\ub294 \ub2e4\uc74c\uacfc \uac19\uc740 \uc870\uac74\uc5d0 \ub530\ub77c \uc0ad\uc81c \uc5ec\ubd80\ub97c \ud310\ub2e8\ud558\uac8c \ub429\ub2c8\ub2e4. \uc2a4\ud0dd \uba54\ubaa8\ub9ac\uc5d0 \uc788\ub294 \ubcc0\uc218 \uc911 \ud574\ub2f9 \uac1d\uccb4\uc5d0 \ub300\ud55c \ucc38\uc870\uac00 \uc788\ub294 \uacbd\uc6b0 \ub610\ub294 \uac1d\uccb4\uac00 \uba54\ubaa8\ub9ac\uc5d0 \uc788\ub2e4\ub294 \uc774\uc57c\uae30\ub294 \ub2e4\uc74c\uc5d0 \uc788\uc744 \ud655\ub960\uc774 \ub192\ub2e4\ub294 \ud310\ub2e8(\uc774\uac8c LRU\ubc29\uc2dd \ub9de\ub098\uc5ec??)\uc744 JVM\uc5d0\uc11c \ud574(\uc77c\ubc18\uc801\uc73c\ub85c \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0\uc11c \uc0ac\uc6a9\ub41c \uac1d\uccb4\uc758 95% \uc774\uc0c1\uc774 \uc0dd\uc131\ub41c \ud6c4 \uace7 \uc0ad\uc81c\ub41c\ub2e4\ub294 \uac00\uc815 \ud558\uc5d0 \uc544\uc9c1\uae4c\uc9c0\ub3c4 \uc788\ub294 \uac1d\uccb4\uc774\ubbc0\ub85c \ud544\ud788 \uc911\uc694\ud55c \uac83 \uc77c\uaebc\uc57c \ud558\ub294 \uae30\uc220\uc744 Generation Copying Collection\uc774\ub77c \ud569\ub2c8\ub2e4) \uac00\uae09\uc801 \uac00\ube44\uc9c0 \uceec\ub809\uc158\uc744 \uc218\ud589 \ud558\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4. \ub610\ub294 \uc815\uc801 \ud639\uc740 \ud604\uc7ac \uc2a4\ucf54\ud504\uc758 \uac1d\uccb4\uac00 \ud574\ub2f9 \uac1d\uccb4\ub97c \ucc38\uace0 \ud558\uace0 \uc788\ub294 \uacbd\uc6b0, JVM\ub0b4\ubd80\uc5d0\uc11c \uc0ac\uc6a9\ud558\ub294 \ub124\uc774\ud2f0\ube0c \uba54\uc18c\ub4dc\uc5d0 \uc0ac\uc6a9\ub418\ub294 \uac1d\uccb4\uc5d0 \ud574\ub2f9 \ud558\ub294 \uacbd\uc6b0 \ub4f1\uc740 \uac00\ube44\uc9c0 \uceec\ub809\uc158\uc5d0\uc11c \uc81c\uc678\ub97c \ud558\uba70 \uae30\ud0c0\uc758 \uacbd\uc6b0\uc5d4 \uba54\ubaa8\ub9ac\uc5d0\uc11c \uc0ad\uc81c\ub97c \ud558\uac8c \ub429\ub2c8\ub2e4. \ub300\ubd80\ubd84\uc758 \ud504\ub85c\uadf8\ub798\ubc0d \uc5b8\uc5b4\uc5d0\uc11c \uc0ac\uc6a9\ub41c \uac1d\uccb4\ub294 \uac70\uc758 \uae08\ubc29 \uc18c\uba78 \ub41c\ub2e4\ub294 \uac83 \ub54c\ubb38\uc5d0 Java\uc5d0\uc11c\ub294 \uba54\ubaa8\ub9ac\ub97c \u00a0\ub450\uac00\uc9c0 \uc601\uc5ed\uc73c\ub85c \uba54\ubaa8\ub9ac\ub97c \ub098\ub204\ub294\ub370 Young \uc601\uc5ed\uacfc Old \uc601\uc5ed\uc73c\ub85c \ub098\ub215\ub2c8\ub2e4. Young \uc601\uc5ed\uc740 \uc0dd\uae34\uc9c0 \uc5bc\ub9c8 \uc548\ub41c \uac1d\uccb4\ub4e4\uc744 \uc800\uc7a5\ud558\ub294 \uc7a5\uc18c\uc774\uace0, Old\uc601\uc5ed\uc740 \uc0dd\uc131\ub41c\uc9c0 \uc624\ub798\ub41c \uac1d\uccb4\ub97c \uc800\uc7a5\ud558\ub294 \uc7a5\uc18c \uc785\ub2c8\ub2e4. \uac01 \uc601\uc5ed\uc758 \uc131\uaca9\uc774 \ub2e4\ub978 \ub9cc\ud07c GC\uc758 \ubc29\ubc95 \ub610\ud55c \ub2e4\ub985\ub2c8\ub2e4. \ub610\ud55c Perm \uc601\uc5ed\uc774\ub77c\uace0 \ubd88\ub9ac\ub294 \uacf3\uc774 \uc788\ub294\ub370 \uc774\uacf3\uc5d0\ub294 \ud074\ub798\uc2a4\ub098 \uba54\uc18c\ub4dc\uc758 \uc2e4\ud589 \ucf54\ub4dc\uac00 \uc800\uc7a5 \ub429\ub2c8\ub2e4. \uadf8\ub798\uc11c GC\uac00 \uc77c\uc5b4\ub098\ub294 \uacf3\uc740 old, new \uc601\uc5ed\uc774\uba70 Perm\uc601\uc5ed\uc740 GC\uac00 \uc218\ud589 \ub418\uc9c0 \uc54a\uc2b5\ub2c8\ub2e4.(\uc18c\uc2a4 \ucf54\ub4dc\uac00 \uc788\uc73c\ubbc0\ub85c)<\/p>\n<p>JDK1.3 \uc774\uc0c1\uc5d0\uc11c \ud0d1\uc7ac\ub41c HOT SPOT VM\uc758 \uacbd\uc6b0(\ubcd1\ubaa9 \ud604\uc0c1\uc774 \uc77c\uc5b4\ub0a0 \ud655\ub960\uc774 \ub192\uc740 \ubd80\ubd84\uc744 \uba3c\uc800 \ucef4\ud30c\uc77c) \uac00\ube44\uc9c0 \uceec\ub809\uc158\uc5d0 \ub530\ub978 \uc131\ub2a5 \uc800\ud558\ub97c \ub9c9\uae30 \uc704\ud574 Generation Copying Collection \uae30\uc220\uc744 \uc774\uc6a9\ud558\uc5ec \uac00\ube44\uc9c0 \uceec\ub809\uc158 \ub300\uc0c1\uc744 \uc904\uc600\uc73c\uba70 Incremetal Pauseless \uae30\ubc95\uc744 \uc774\uc6a9\ud558\uc5ec \uac00\ube44\uc9c0\uceec\ub809\uc158 \ub300\uc0c1\uc744 \uc5ec\ub7ec \uac1c\uc758 \uc791\uc740 \uadf8\ub8f9\uc73c\ub85c \ub098\ub204\uc5b4 \ud655\uc2e4\ud788 \uc0ad\uc81c \uac00\ub2a5\ud55c \uac1d\uccb4\ubd80\ud130 \uc9c0\uc6cc\ub098\uac00\ub294 \ubc29\uc2dd\uc744 \ucc44\ud0dd \ud588\uc2b5\ub2c8\ub2e4. Incremetal Pauseless \uae30\ubc95\uc5d0\uc11c\ub294 1\ucc28 \uac00\ube44\uc9c0 \uceec\ub809\uc158 \ub300\uc0c1\uc740 \uac1d\uccb4\uc758 \ud5e4\ub354\uc5d0 GC \ud544\ub4dc\uac00\uc124\uc815\ub41c \uac83\uc774\uace0 2\ucc28 \ub300\uc0c1\uc740 \uc704\uc758 4\uac00\uc9c0 \uc720\ud615\uc5d0 \uc18d\ud558\uc9c0 \uc54a\uc740 \uac83 \uc785\ub2c8\ub2e4. 2\ucc28 \ub300\uc0c1\uc758 \uacbd\uc6b0 \uc77c\ub2e8 CG\ud544\ub4dc\ub97c \uc124\uc815 \ud558\uace0 \ub2e4\uc74c\ubc88 \uac00\ube44\uc9c0 \uceec\ub809\uc158 \uc8fc\uae30\uc5d0 \uc0ad\uc81c \ub418\ub294 \uac83 \uc785\ub2c8\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Java Virtual Machine\uc758 \uba54\ubaa8\ub9ac \uad00\ub9ac \uc804\ud1b5\uc801\uc778 C\uc5b8\uc5b4\ub098 C++\uc5b8\uc5b4\uc640\ub294 \ub2ec\ub9ac \uc790\ubc14\uc5d0\uc11c\ub294 \uba54\ubaa8\ub9ac \uad00\ub9ac\ub294 \ud504\ub85c\uadf8\ub798\uba38\uac00 \uc77c\uc77c\uc774 \ud558\uc9c0 \uc54a\uace0 JVM\uc5d0\uc11c \uc54c\uc544\uc11c \uad00\ub9ac \ud574 \uc90d\ub2c8\ub2e4.(\ubb3c\ub860 \ub2f7\ub137\uc758 \uacbd\uc6b0\uc5d4 \uc790\ubc14\uc640 \ube44\uc2b7\ud55c \ubc29\ubc95\uc73c\ub85c \ud558\uc9c0\ub9cc) \uba54\ubaa8\ub9ac \uad00\ub9ac\ub780 \ud06c\uac8c \ubcf4\uba74 \uc0dd\uc131\/\uc18c\uba78(\uc0ad\uc81c, \ubc18\ub0a9)\uc758 \uacfc\uc815\uc73c\ub85c \uc0dd\uac01 \ud560 \uc218 \uc788\ub294\ub370 \uc6b0\ub9ac\uac00 &hellip; 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