{"id":855,"date":"2018-03-21T10:24:52","date_gmt":"2018-03-21T19:24:52","guid":{"rendered":"\/blog\/?p=855"},"modified":"2023-09-21T09:37:36","modified_gmt":"2023-09-21T00:37:36","slug":"%ec%9e%90%eb%b0%94-%ec%95%a0%ed%94%8c%eb%a6%ac%ec%bc%80%ec%9d%b4%ec%85%98-%ec%84%b1%eb%8a%a5-%ed%8a%9c%eb%8b%9d%ec%9d%98-%eb%8f%84%e9%81%93","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=855","title":{"rendered":"\uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd\uc758 \ub3c4(\u9053)"},"content":{"rendered":"\n

\ucd9c\ucc98 : <\/span>http:\/\/d2.naver.com\/helloworld\/184615<\/span><\/font><\/p>\n

\uc774 \uae00\uc740 \uc6d4\uac04 \"\ub9c8\uc774\ud06c\ub85c\uc18c\ud504\ud2b8\uc6e8\uc5b4\" 2012\ub144 9\uc6d4\ud638\uc5d0 \"\uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd\uc758 \ub3c4(\u9053)\"\ub77c\ub294 \uc81c\ubaa9\uc73c\ub85c \uc2e4\ub9b0 \uae00\uc785\ub2c8\ub2e4. \ud3b8\uc9d1 \uacfc\uc815\uc744 \uac70\uce58\uba70 \uc77c\ubd80 \ub0b4\uc6a9\uc774 \ucc45\uc5d0 \uc2e4\ub9b0 \ub0b4\uc6a9\uacfc \ub2e4\ub97c \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/span><\/p>\n

\uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc131\ub2a5\uc744 \ud29c\ub2dd\ud558\ub294 \uc791\uc5c5\uc740 \uc790\ubc14 \ubc0f JVM\uc5d0 \ub300\ud55c \uc9c0\uc2dd\uacfc \uc218\ub9ce\uc740 \ud29c\ub2dd \uae30\ubc95, \ub2e4\uc591\ud55c \ud658\uacbd\uacfc \uc0c1\ud669\uc5d0 \ub300\ud55c \uacbd\ud5d8 \ub4f1\uc744 \ud544\uc694\ub85c \ud55c\ub2e4. \uadf8\ub7ec\ub098 \uc774 \ubaa8\ub4e0 \ub0b4\uc6a9\uc744 \uc9e7\uc740 \uc9c0\uba74\uc5d0\uc11c \uc18c\uac1c\ud558\uae30\uc5d0\ub294 \ubb34\ub9ac\uc774\ub2c8 \uc774 \uae00\uc5d0\uc11c\ub294 \uc131\ub2a5 \ud29c\ub2dd \uc791\uc5c5\uc758 \uc0c1\uc138\ud55c \ub0b4\uc6a9\ubcf4\ub2e4\ub294 \ud29c\ub2dd\uc5d0 \ud544\uc694\ud55c \ubc30\uacbd \uc9c0\uc2dd\uacfc \ud29c\ub2dd \uc21c\uc11c, JVM\uc758 \uac01\uc885 \uc635\uc158 \ubc0f \ud29c\ub2dd \uc811\uadfc \ubc29\ubc95 \ub4f1\uc758 \uac04\ub7b5\ud55c \uc18c\uac1c\ub97c \ud1b5\ud574 \uc131\ub2a5 \ud29c\ub2dd\uc758 \uc804\ubc18\uc801\uc778 \ud750\ub984\uacfc \ubc29\ubc95\ub860\uc5d0 \ub300\ud574 \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uc790. \ud2b9\ud788 \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \uc5ec\ub7ec \ub3c4\uba54\uc778 \uc911\uc5d0\uc11c \uc778\ud130\ub137 \uc11c\ube44\uc2a4\ub97c \uc704\ud55c \uc6f9 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0 \uc911\uc810\uc744 \ub450\uace0 \uc124\uba85\ud574\ub098\uac00\uaca0\ub2e4.<\/span><\/p>\n

\ubaa8\ub4e0 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc774 \ud29c\ub2dd\uc744 \ud544\uc694\ub85c \ud558\ub294 \uac83\uc740 \uc544\ub2c8\ub2e4. \ucda9\ubd84\ud55c \uc131\ub2a5\uc744 \ub0b4\uace0 \uc788\ub2e4\uba74 \uad73\uc774 \ucd94\uac00\uc801\uc778 \ub178\ub825\uc744 \ub4e4\uc77c \ud544\uc694\ub294 \uc5c6\ub2e4. \ud558\uc9c0\ub9cc \ubc29\uae08 \ub514\ubc84\uae45\uc744 \ub9c8\uce5c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc774\ub77c\uace0 \ud574\uc11c \ud56d\uc0c1 \ubaa9\ud45c \uc131\ub2a5\ub9cc\ud07c \ub3d9\uc791\ud574 \uc904 \uac83\uc774\ub77c\uace0 \uae30\ub300\ud560 \uc218\ub294 \uc5c6\uace0 \uadf8\ub807\uac8c \uae30\uc900\uce58 \uc774\ud558\ub85c \uc131\ub2a5\uc774 \ubbf8\ub2ec\ub420 \ub54c \ud29c\ub2dd\uc774 \ud544\uc694\ud574\uc9c4\ub2e4. \uad6c\ud604 \uc5b8\uc5b4\uc5d0 \uc0c1\uad00\uc5c6\uc774 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ud29c\ub2dd\ud558\ub294 \uac83\uc740 \uc0c1\ub2f9\ud55c \uc804\ubb38\uc801\uc778 \uc9c0\uc2dd\uacfc \ub192\uc740 \uc9d1\uc911\uc744 \uc694\uad6c\ud558\ub294 \uc77c\uc778\ub370\ub2e4, A\ub77c\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ud29c\ub2dd\ud588\uc744 \ub54c \uc0ac\uc6a9\ud588\ub358 \ubc29\ubc95\uc744 B\ub77c\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ud29c\ub2dd\ud560 \ub54c \uc7ac\ud65c\uc6a9\ud560 \uc218 \uc788\ub294 \uac83\ub3c4 \uc544\ub2c8\ub2e4. \uc560\ud50c\ub9ac\ucf00\uc774\uc158\ub9c8\ub2e4 \uace0\uc720\ud55c \ub3d9\uc791\uc774 \uc788\uace0 \ucef4\ud4e8\ud130 \uc790\uc6d0\uc744 \uc0ac\uc6a9\ud558\ub294 \ud615\ud0dc\uac00 \ub2e4\ub974\uae30 \ub54c\ubb38\uc774\ub2e4.<\/span><\/p>\n

\uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ud29c\ub2dd\ud558\uae30 \uc704\ud574\uc11c\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc791\uc131 \uc9c0\uc2dd\ubcf4\ub2e4 \uc880 \ub354 \uadfc\ubcf8\uc801\uc774\uace0 \ud3ec\uad04\uc801\uc778, \uc608\ub97c \ub4e4\uba74 \ubc84\ucd94\uc5bc\uba38\uc2e0\uc774\ub098 OS, \ucef4\ud4e8\ud130 \uc544\ud0a4\ud14d\ucc98 \ub4f1\uc5d0 \ub300\ud55c \uc9c0\uc2dd\uc774 \ud544\uc694\ud558\ub2e4. \uc774\ub7f0 \uc9c0\uc2dd\uc744 \ubc14\ud0d5\uc73c\ub85c \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ub3c4\uba54\uc778\uc5d0 \uc9d1\uc911\ud574\uc57c \uc218\uc6d4\ud55c \ud29c\ub2dd\uc774 \uac00\ub2a5\ud558\ub2e4.<\/span><\/p>\n

\uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ud29c\ub2dd\uc774\ub780 \uacbd\uc6b0\uc5d0 \ub530\ub77c GC \uac19\uc740 JVM \uc635\uc158 \uac12 \ubcc0\uacbd\ub9cc\uc73c\ub85c \ucda9\ubd84\ud560 \uc218\ub3c4 \uc788\uace0 \uc544\uc608 \ucf54\ub4dc\ub97c \uc218\uc815\ud574\uc57c \ud560 \ub54c\ub3c4 \uc788\ub2e4. \uc5b4\ub290 \ubc29\ubc95\uc744 \uc120\ud0dd\ud558\ub4e0 \uc6b0\uc120 \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc218\ud589 \uacfc\uc815\uc744 \ubaa8\ub2c8\ud130\ub9c1\ud574\uc57c \ud55c\ub2e4.<\/span><\/p>\n

\uadf8\ub798\uc11c \uc774 \uae00\uc5d0\uc11c\ub294 '\uc5b4\ub5bb\uac8c \ubaa8\ub2c8\ud130\ub9c1\uc744 \ud558\ub294\uac00', '\uc5b4\ub5bb\uac8c JVM \uc635\uc158\uc744 \uc8fc\uc5b4\uc57c \ud558\ub294\uac00', '\ucf54\ub4dc \uc218\uc815 \ud544\uc694 \ud310\ub2e8\uc740 \uc5b4\ub5bb\uac8c \ud558\ub294\uac00'\ub97c \uc911\uc2ec\uc73c\ub85c \uc0b4\ud3b4\ubcf4\ub3c4\ub85d \ud558\uaca0\ub2e4.<\/span><\/p>\n

\uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd\uc5d0 \ud544\uc694\ud55c \uc9c0\uc2dd<\/span><\/h2>

JVM\uc0c1\uc5d0\uc11c \ub3d9\uc791\ud558\ub294 \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \ud29c\ub2dd\uc744 \uc704\ud574\uc11c\ub294 JVM\uc758 \ub3d9\uc791 \uacfc\uc815\uc5d0 \ub300\ud55c \uc774\ud574\uac00 \ud544\uc694\ud558\ub2e4. \uc5ec\uae30\uc11c \ub9d0\ud558\ub294 JVM \ub3d9\uc791 \uacfc\uc815\uc5d0 \ub300\ud55c \uc9c0\uc2dd\uc774\ub780 \ud06c\uac8c Garbage Collection(\uc774\ud558 GC)\uc5d0 \ub300\ud55c \uac83\uacfc HotSpot\uc5d0 \ub300\ud55c \uc9c0\uc2dd\uc744 \uaf3d\uc744 \uc218 \uc788\ub2e4. \ubb3c\ub860 GC\ub098 HotSpot \uc9c0\uc2dd\ub9cc\uc73c\ub85c \ubaa8\ub4e0 \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0 \ub300\ud55c \uc131\ub2a5 \ud29c\ub2dd\uc744 \ud560 \uc218 \uc788\ub294 \uac83\uc740 \uc544\ub2c8\uc9c0\ub9cc \uc131\ub2a5\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce58\ub294 \ub300\ubd80\ubd84\uc758 \uc694\uc18c\ub294 \uc774 \ub450 \uac00\uc9c0\uc5d0 \uc18d\ud55c\ub2e4.<\/span><\/p>\n

JVM\uc758 \uc6d0\ud65c\ud55c \ub3d9\uc791 \ud658\uacbd\uc744 \ub9cc\ub4e4\uae30 \uc704\ud574\uc11c\ub294 OS\uac00 \uac01 \ud504\ub85c\uc138\uc2a4\uc5d0 \uc790\uc6d0\uc744 \ubd84\ubc30\ud558\ub294 \ubc29\uc2dd\uc5d0 \ub300\ud55c \uc774\ud574\uac00 \ud544\uc694\ud558\ub2e4. \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd\uc744 \uc704\ud574\uc11c\ub294 JVM \uc790\uccb4\ub294 \ubb3c\ub860 OS\ub098 \ud558\ub4dc\uc6e8\uc5b4\uc5d0 \ub300\ud55c \uc774\ud574\ub3c4 \ud544\uc694\ud558\ub2e4\ub294 \uac83\uc774\ub2e4. OS \uad00\uc810\uc5d0\uc11c \ubcfc \ub54c JVM \ub610\ud55c \ud558\ub098\uc758 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ud504\ub85c\uc138\uc2a4\ub77c\ub294 \uc810\uc744 \uc5fc\ub450\uc5d0 \ub450\ub3c4\ub85d \ud558\uc790. \ub367\ubd99\uc5ec \uc790\ubc14 \uc5b8\uc5b4 \ub3c4\uba54\uc778\uc5d0 \ub300\ud55c \uc9c0\uc2dd\ub3c4 \uc911\uc694\ud558\ub2e4. Lock\uc774\ub098 Concurrency\uc5d0 \ub300\ud55c \uc774\ud574\ub294 \ubb3c\ub860 \ud074\ub798\uc2a4 \ub85c\ub529\uc774\ub098 \uac1d\uccb4 \uc0dd\uc131\uc5d0 \ub300\ud55c \uc9c0\uc2dd \ub610\ud55c \uc911\uc694\ub3c4\uac00 \ub192\ub2e4.<\/span><\/p>\n

\uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd\uc744 \ud560 \ub54c\ub294 \uc774\ub7ec\ud55c \uc9c0\uc2dd\ub4e4\uc744 \uc885\ud569\ud574 \uc811\uadfc\ud574\uc57c \ud55c\ub2e4.<\/span><\/p>\n

\uc131\ub2a5 \ud29c\ub2dd \uacfc\uc815<\/span><\/h2>

<\uadf8\ub9bc 1>\uc740 \ucc30\ub9ac \ud5cc\ud2b8\uc640 \ube44\uc544\ub204 \uc874 \ub450 \uc0ac\ub78c\uc758 \uacf5\ub3d9\uc800\uc11c\uc778 'Java Performance'\uc5d0\uc11c \uc778\uc6a9\ud55c \uc21c\uc11c\ub3c4\ub85c \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd \uacfc\uc815\uc744 \ud45c\ud604\ud55c \uac83\uc774\ub2e4.<\/span><\/p>\n

\"img1.png\"\n<\/span><\/p>\n

\uadf8\ub9bc 1 \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd \uacfc\uc815<\/span><\/p>\n

\uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \ud29c\ub2dd \uacfc\uc815\uc740 \ud55c \ubc88\uc5d0 \ud1b5\uacfc\ud558\ub294 \uacfc\uc815\uc774 \uc544\ub2c8\ub77c \ud29c\ub2dd \uc644\uacb0\uae4c\uc9c0 \uba87 \ubc88\uc774\uace0 \uacc4\uc18d \ubc18\ubcf5\ud560 \uc218\ub3c4 \uc788\ub2e4. \uae30\ub300 \uc131\ub2a5 \uc218\uce58 \uc124\uc815 \ub610\ud55c \ub9c8\ucc2c\uac00\uc9c0\ub2e4. \ud29c\ub2dd \uacfc\uc815\uc744 \ud1b5\ud574 \uae30\ub300 \uc131\ub2a5 \uc218\uce58\ub97c \ud558\ud5a5\ud574\uc57c \ud560 \ub54c\ub3c4 \uc788\uace0 \uc624\ud788\ub824 \uae30\ub300 \uc131\ub2a5 \uc218\uce58\ub97c \uc0c1\ud5a5\ud560 \ub54c\ub3c4 \uc788\ub2e4.<\/span><\/p>\n

JVM \ubc30\ud3ec \ubaa8\ub378\uc774\ub780 \ud558\ub098\uc758 JVM\uc5d0\uc11c \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ub3d9\uc791\uc2dc\ud0ac \uac83\uc778\uc9c0 \uc5ec\ub7ec JVM\uc5d0\uc11c \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ub3d9\uc791\uc2dc\ud0ac \uac83\uc778\uc9c0 \uacb0\uc815\ud558\ub294 \uac83\uc73c\ub85c \uac00\uc6a9\uc131, \uc751\ub2f5 \ubc18\uc751\uc131, \uad00\ub9ac \ud3b8\uc758\uc131 \ub4f1\uc5d0 \ub530\ub77c \ubcc0\uacbd\ub420 \uc218 \uc788\ub2e4.<\/span><\/p>\n

JVM\uc774 \uc5ec\ub7ec \uc11c\ubc84\uc5d0\uc11c \ub3d9\uc791\ud558\ub294 \uacbd\uc6b0\uc5d0\ub3c4 \ud55c \uc11c\ubc84\uc5d0\uc11c \uc5ec\ub7ec \uac1c\uc758 JVM\uc744 \ub3d9\uc791\ud558\ub3c4\ub85d \ud558\uac70\ub098 \uc11c\ubc84\ub9c8\ub2e4 \uac01\uac01\uc758 JVM\uc744 \ub3d9\uc791\ud558\uac8c \ud560 \uc218\ub3c4 \uc788\ub2e4.<\/span><\/p>\n

\ubb3c\ub860 \ud558\ub098\uc758 \uc11c\ubc84\uc5d0 \uba87 \uac1c\uc758 JVM\uc774 \ub3d9\uc791\ud560 \uac83\uc778\uac00\ub294 \uc11c\ubc84\uc758 \ucf54\uc5b4 \uac1c\uc218\uc640 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc758 \ud2b9\uc131 \ub4f1\uc5d0 \ub530\ub77c \uacb0\uc815\ub418\uaca0\uc9c0\ub9cc \uc751\ub2f5 \ubc18\uc751\uc131 \uad00\uc810\uc5d0\uc11c \uc591\uc790\ub97c \ube44\uad50\ud574\ubcfc \ub54c, \uac19\uc740 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc77c \uacbd\uc6b0 2GB\uc758 \ud799\uc744 \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0\uac00 8GB \ud06c\uae30\uc758 \ud799\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\ubcf4\ub2e4 \ud480 GC\uc5d0 \uac78\ub9ac\ub294 \uc2dc\uac04\uc774 \uc9e7\uc544 \uc751\ub2f5 \ubc18\uc751\uc131\uc5d0 \uc720\ub9ac\ud558\ub2e4. \ud558\uc9c0\ub9cc 8GB \ud799\uc744 \uc0ac\uc6a9\ud558\uba74 2GB\ubcf4\ub2e4 \ud480 GC \ubc1c\uc0dd \uac04\uaca9\uc774 \uadf8\ub9cc\ud07c \uc904\uc5b4\ub4e4 \uac83\uc774\uace0 \ub0b4\ubd80 \uce90\uc2dc\ub97c \uc0ac\uc6a9\ud558\ub294 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc774\ub77c\uba74 \ud788\ud2b8\uc728\uc744 \ub192\uc5ec \uc751\ub2f5 \ubc18\uc751\uc131\uc744 \ub192\uc77c \uc218 \uc788\ub2e4.<\/span><\/p>\n

\uc989 \ud558\ub098\uc758 \uc7a5\uc810\uc744 \uc120\ud0dd\ud588\uc744 \ub54c \uadf8 \uc120\ud0dd\uc5d0 \ub4a4\ub530\ub974\ub294 \ub2e8\uc810\uc744 \uadf9\ubcf5\ud560 \uc218 \uc788\ub294 \ubc29\ubc95\uc744 \uace0\ub824\ud574\uc57c \uc801\ud569\ud55c \ubc30\ud3ec \ubaa8\ub378\uc744 \uacb0\uc815\ud560 \uc218 \uc788\ub2e4.<\/span><\/p>\n

JVM \uc120\ud0dd\uc774\ub780 32bit JVM\uc744 \uc0ac\uc6a9\ud560 \uac83\uc774\ub0d0 64bit JVM\uc744 \uc0ac\uc6a9\ud560 \uac83\uc774\ub0d0\uc5d0 \ub300\ud55c \uacb0\uc815\uc774\ub2e4. \ub3d9\uc77c \uc870\uac74\uc774\ub77c\uba74 32bit JVM\uc744 \uc120\ud0dd\ud558\ub294 \uac83\uc774 \uc88b\ub2e4. 32bit JVM\uc774 64bit JVM\ubcf4\ub2e4 \uc218\ud589 \uc131\ub2a5\uc774 \uc88b\uae30 \ub54c\ubb38\uc774\ub2e4. 32bit JVM\uc740 \ub17c\ub9ac\uc801 \ucd5c\ub300 \uc0ac\uc6a9 \uac00\ub2a5 \ud799 \ud06c\uae30\uac00 4GB\ub85c, \uc774\ubcf4\ub2e4 \ud070 \ud06c\uae30\uc758 \ud799\uc744 \uc0ac\uc6a9\ud560 \ud544\uc694\uac00 \uc788\uc744 \ub54c 64bit JVM\uc744 \uc0ac\uc6a9\ud558\ub294 \uac83\uc774 \uc88b\ub2e4(\ub2e8 32bit OS\/64bit OS \ubaa8\ub450 \uc2e4\uc81c \uc0ac\uc6a9 \ud560\ub2f9 \ud06c\uae30\ub294 2~3GB \uc815\ub3c4\ub2e4).<\/span><\/p>\n

\ud45c 1 \uc131\ub2a5 \ube44\uad50 \uc790\ub8cc(<\/span>\ucd9c\ucc98<\/span><\/a>)<\/span><\/span><\/p>\n
Benchmark<\/span><\/td>Time [sec]<\/span><\/td>Factor<\/span><\/td><\/tr>
C++ Opt<\/span><\/td>23<\/span><\/td>1.0x<\/span><\/td><\/tr>
C++ Dbg<\/span><\/td>197<\/span><\/td>8.6x<\/span><\/td><\/tr>
Java 64-bit<\/span><\/td>134<\/span><\/td>5.8x<\/span><\/td><\/tr>
Java 32-bit<\/span><\/td>290<\/span><\/td>12.6x<\/span><\/td><\/tr>
Java 32-bit GC<\/span><\/td>106<\/span><\/td>4.6x<\/span><\/td><\/tr>
Java 32-bit SPEC GC<\/span><\/td>89<\/span><\/td>3.7x<\/span><\/td><\/tr>
Scala<\/span><\/td>82<\/span><\/td>3.6x<\/span><\/td><\/tr>
Scala low-level<\/span><\/td>67<\/span><\/td>2.9x<\/span><\/td><\/tr>
Scala low-level GC<\/span><\/td>58<\/span><\/td>2.5x<\/span><\/td><\/tr>
Go 6g<\/span><\/td>161<\/span><\/td>7.0x<\/span><\/td><\/tr>
Go Pro<\/span><\/td>126<\/span><\/td>5.5x<\/span><\/td><\/tr><\/tbody><\/table>

\uc774\uc81c \uc791\uc131\ud55c \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac00\ub3d9\ud574 \uc131\ub2a5\uc744 \uce21\uc815\ud558\uc790. \uc774 \uacfc\uc815\uc5d0\uc11c \uc2dc\uc2a4\ud15c \ubaa8\ub2c8\ud130\ub9c1 \ub3c4\uad6c\ub098 \ud504\ub85c\ud30c\uc77c\ub9c1 \ub3c4\uad6c\ub97c \uc0ac\uc6a9\ud574 GC \ud29c\ub2dd, OS \uc124\uc815 \ubcc0\uacbd, \ucf54\ub4dc \uc218\uc815 \ub4f1\uc758 \uc791\uc5c5\uc744 \ud55c\ub2e4.<\/span><\/p>\n

\uc751\ub2f5 \ubc18\uc751\uc131\uc744 \uc704\ud55c \ud29c\ub2dd\uacfc \ucc98\ub9ac\ub7c9\uc744 \uc704\ud55c \ud29c\ub2dd\uc740 \ubcc4\uac1c\uc758 \uc791\uc5c5\uc77c \uc218 \uc788\ub2e4. \ub2e8\uc704 \uc2dc\uac04\ub2f9 \ucc98\ub9ac\ub7c9\uc774 \ub9ce\ub354\ub77c\ub3c4 \ud480 GC \ub4f1\uc744 \uc704\ud574 \ub54c\ub54c\ub85c \uae34 'stop the world' \ud604\uc0c1\uc774 \ubc1c\uc0dd\ud55c\ub2e4\uba74 \uc751\ub2f5 \ubc18\uc751\uc131\uc774 \ub0ae\uc544\uc9c0\uac8c \ub41c\ub2e4. \ub610\ud55c \uc77c\uc815 \ubd80\ubd84 \ud2b8\ub808\uc774\ub4dc \uc624\ud504\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc74c\uc744 \uace0\ub824\ud574\uc57c \ud55c\ub2e4. \uc774\ub7f0 \ud2b8\ub808\uc774\ub4dc \uc624\ud504\ub294 \uc751\ub2f5 \ubc18\uc751\uc131\uacfc \ucc98\ub9ac\ub7c9 \uc0ac\uc774\uc758 \uad00\uacc4\uc5d0\ub9cc \uc788\uc9c0\ub294 \uc54a\uc74c\uc744 \uc5fc\ub450\uc5d0 \ub450\uc790. \uc801\uc740 \uba54\ubaa8\ub9ac \uc0ac\uc6a9\uc744 \uc704\ud574 CPU \uc790\uc6d0\uc744 \ub354 \uc0ac\uc6a9\ud574\uc57c \ud558\uac70\ub098 \uc751\ub2f5 \ubc18\uc751\uc131\uc774\ub098 \ucc98\ub9ac\ub7c9 \uc190\uc2e4\uc744 \uac10\uc218\ud574\uc57c \ud560 \uc218\ub3c4 \uc788\uace0 \ubc18\ub300\uc758 \uacbd\uc6b0\ub3c4 \ubc1c\uc0dd\ud55c\ub2e4. \uadf8\ub7ec\ubbc0\ub85c \uc6b0\uc120\uc21c\uc704\ub97c \uc124\uc815\ud574 \uc811\uadfc\ud574\uc57c \ud55c\ub2e4.<\/span><\/p>\n

<\uadf8\ub9bc 1>\uc758 \uc21c\uc11c\ub3c4\ub294 Swing \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \ud3ec\ud568\ud55c \ud3ec\uad04\uc801\uc778 \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0 \ub300\ud55c \uc131\ub2a5 \ud29c\ub2dd \uc811\uadfc \ubc29\ubc95\uc774\uae30\uc5d0 \uc778\ud130\ub137 \uc11c\ube44\uc2a4\ub97c \uc704\ud55c \uc11c\ubc84 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uc791\uc131\ud560 \ub54c\ub294 \uc801\ud569\ud558\uc9c0 \uc54a\ub2e4. <\uadf8\ub9bc 1>\uc744 \ubc14\ud0d5\uc73c\ub85c \uc778\ud130\ub137 \uc11c\ube44\uc2a4\uc5d0 \ub9de\ub294 \uc808\ucc28\ub97c \ub9cc\ub4e4\uba74 <\uadf8\ub9bc 2>\uc640 \uac19\uc740 \uc21c\uc11c\ub3c4\uac00 \ub41c\ub2e4.<\/span><\/p>\n

\"helloworld-184615-2.png\"\n<\/span><\/p>\n

\uadf8\ub9bc 2 \uc778\ud130\ub137 \uc11c\ube44\uc2a4 \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uad8c\uc7a5 \ud29c\ub2dd \uc808\ucc28<\/span><\/p>\n

<\uadf8\ub9bc 2>\ub97c \ucc38\uace0\ud574 \uac01\uac01\uc758 \uc808\ucc28\ub97c \uc218\ud589\ud558\uae30 \uc704\ud574 \ud544\uc694\ud55c \uc77c\uc744 \uc54c\uc544\ubcf4\ub3c4\ub85d \ud558\uc790.<\/span><\/p>\n

JVM \uc635\uc158<\/span><\/h2>

\uc6f9 \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc11c\ubc84 \uc704\uc8fc\ub85c JVM \uc635\uc158 \uc9c0\uc815 \ubc29\ubc95\uc744 \uc124\uba85\ud558\uaca0\ub2e4. \ubaa8\ub4e0 \uacbd\uc6b0\ub77c\uace0 \ud560 \uc218\ub294 \uc5c6\uc9c0\ub9cc \ub300\ubd80\ubd84\uc758 \uc6f9 \uc11c\ubc84 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uac00\uc7a5 \uc88b\uc740 GC \uc54c\uace0\ub9ac\uc998\uc740 Concurrent Mark Sweep GC\ub2e4. \uc774\ub294 \ub0ae\uc740 \ub51c\ub808\uc774\uac00 \uc911\uc694\ud558\uae30 \ub54c\ubb38\uc778\ub370, \ubb3c\ub860 Concurrent Mark Sweep\uc744 \uc0ac\uc6a9\ud560 \uacbd\uc6b0\uc5d0\ub294 fraction\uc774 \ubc1c\uc0dd\ud574 \uacbd\uc6b0\uc5d0 \ub530\ub77c \ub9e4\uc6b0 \uae34 Stop the World \ud604\uc0c1\uc774 \ubc1c\uc0dd\ud560 \uc218\ub3c4 \uc788\ub2e4. \ud558\uc9c0\ub9cc \uc774 \uc5ed\uc2dc New \uc601\uc5ed\uc758 \ud06c\uae30\ub098 fraction ratio\ub97c \uc870\uc815\ud574 \ud574\uacb0\ud560 \uc218 \uc788\ub294 \uacbd\uc6b0\uac00 \ub9ce\ub2e4.<\/span><\/p>\n

\uc804\uccb4 \ud799 \uc0ac\uc774\uc988\uc758 \ud06c\uae30 \uc9c0\uc815\ub9cc\ud07c New \uc601\uc5ed\uc758 \ud06c\uae30 \uc9c0\uc815 \ub610\ud55c \uc911\uc694\ud558\ub2e4. XX:NewRatio \uc635\uc158\uc744 \uc774\uc6a9\ud574 \uc804\uccb4 \ud799 \ud06c\uae30 \uc911 New \ud06c\uae30\uc758 \ube44\uc728\uc744 \uc9c0\uc815\ud558\uac70\ub098 XX:NewSize \uc635\uc158\uc744 \uc0ac\uc6a9\ud574 \uc6d0\ud558\ub294 \ud06c\uae30\ub9cc\ud07c\uc758 New \uc601\uc5ed \ud06c\uae30\ub97c \uc9c0\uc815\ud558\ub294 \uac83\uc774 \uc88b\ub2e4. \ub300\ubd80\ubd84\uc758 \uac1d\uccb4\ub294 \uc0dd\uc874 \uc2dc\uac04\uc774 \uae38\uc9c0 \uc54a\uae30 \ub54c\ubb38\uc5d0 New \uc601\uc5ed \ud06c\uae30 \uc9c0\uc815\uc774 \uc911\uc694\ud574\uc9c4\ub2e4. \uc6f9 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc5d0\uc11c \uce90\uc2dc \ub370\uc774\ud130\ub97c \uc81c\uc678\ud55c \ub300\ubd80\ubd84\uc758 \uac1d\uccb4\ub294 HttpRequest\uc5d0 \ub300\ud55c HttpResponse\uac00 \ub9cc\ub4e4\uc5b4\uc9c0\ub294 \uc2dc\uac04\uc5d0 \uc0dd\uc131\ub41c\ub2e4. \ubcf4\ud1b5 \uc774 \uc2dc\uac04\uc740 1\ucd08\ub97c \ub118\uc9c0 \uc54a\uae30\uc5d0 \uac1d\uccb4\uc758 \uc0dd\uc874 \uc2dc\uac04\ub3c4 1\ucd08\uac00 \ub418\uc9c0 \uc54a\ub294\ub2e4. \ub9cc\uc57d New \uc601\uc5ed\uc758 \ud06c\uae30\uac00 \ud06c\uc9c0 \uc54a\ub2e4\uba74 \uc0c8\ub85c \uc0dd\uc131\ub418\ub294 \uac1d\uccb4\uc758 \uc790\ub9ac\ub97c \uc704\ud574 Old \uc601\uc5ed\uc73c\ub85c \uc774\ub3d9\ub3fc\uc57c \ud558\uace0 Old \uc601\uc5ed\uc5d0 \ub300\ud55c GC \ube44\uc6a9\uc740 New \uc601\uc5ed\uc5d0 \ub300\ud55c GC \ube44\uc6a9\ubcf4\ub2e4 \uc0c1\ub2f9\ud788 \ud06c\uae30 \ub54c\ubb38\uc5d0 \ucda9\ubd84\ud55c New \uc601\uc5ed \ud06c\uae30\ub97c \uc7a1\uc544\uc918\uc57c \ud55c\ub2e4.<\/span><\/p>\n

\ub2e4\ub9cc \uc77c\uc815 \uc218\uce58 \uc774\uc0c1\uc73c\ub85c New \uc601\uc5ed\uc758 \ud06c\uae30\uac00 \ucee4\uc9c0\uba74 \uc624\ud788\ub824 \uc751\ub2f5 \ubc18\uc751\uc131\uc774 \ub5a8\uc5b4\uc9c0\ub294 \ubb38\uc81c\uac00 \ubc1c\uc0dd\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c \uc8fc\uc758\ud558\uc790. New \uc601\uc5ed\uc5d0 \ub300\ud55c GC\ub294 \uae30\ubcf8\uc801\uc73c\ub85c \uc5b4\ub290 \ud55c \uc11c\ubc14\uc774\ubc84 \uc601\uc5ed\uc5d0\uc11c \ub2e4\ub978 \uc11c\ubc14\uc774\ubc84 \uc601\uc5ed\uc73c\ub85c \ubcf5\uc0ac\ud558\ub294 \uac83\uc774\uae30 \ub54c\ubb38\uc774\ub2e4. \ub610\ud55c Old \uc601\uc5ed\ubfd0\ub9cc \uc544\ub2c8\ub77c New \uc601\uc5ed\uc5d0 \ub300\ud55c GC\ub97c \ud560 \ub54c\uc5d0\ub3c4 Stop the World \ud604\uc0c1\uc740 \ubc1c\uc0dd\ud55c\ub2e4. New \uc601\uc5ed\uc774 \ucee4\uc9c0\uba74 \uc0c1\ub300\uc801\uc73c\ub85c \uc11c\ubc14\uc774\ubc84 \uc601\uc5ed\uc758 \ud06c\uae30\ub3c4 \ucee4\uc838 \uadf8\ub9cc\ud07c \ubcf5\uc0ac\ud574\uc57c \ud560 \ub370\uc774\ud130\uc758 \ud06c\uae30\ub3c4 \ub298\uc5b4\ub09c\ub2e4. \uc774\ub7f0 \ud2b9\uc131\uc744 \uac10\uc548\ud574 New \uc601\uc5ed\uc758 \ud06c\uae30\ub97c \uc815\ud560 \ub54c\ub294 HotSpot JVM\uc758 OS\ubcc4 NewRatio\ub97c \ucc38\uace0\ud558\ub294 \uac83\uc774 \uc88b\ub2e4.<\/span><\/p>\n

\ud45c 2 OS\uc640 \uc635\uc158\ubcc4 NewRatio<\/span><\/p>\n
OS & option<\/span><\/td>\ub514\ud3f4\ud2b8 \u2013XX:NewRatio<\/span><\/td><\/tr>
Sparc \u2013server<\/span><\/td>2<\/span><\/td><\/tr>
Sparc \u2013client<\/span><\/td>8<\/span><\/td><\/tr>
x86 \u2013server<\/span><\/td>8<\/span><\/td><\/tr>
x86 \u2013client<\/span><\/td>12<\/span><\/td><\/tr><\/tbody><\/table>

NewRatio\ub97c \uc9c0\uc815\ud558\uba74 \uc804\uccb4 \ud799 \ud06c\uae30 \uc911\uc5d0\uc11c 1\/(NewRatio + 1) \ub9cc\ud07c\uc774 New \uc601\uc5ed\uc758 \ud06c\uae30\uac00 \ub41c\ub2e4. Sparc server\uc758 NewRatio\uac00 \uc720\ub3c5 \uc791\uc740 \uac83\uc744 \uc54c \uc218 \uc788\ub294\ub370 \uae30\ubcf8\uac12\uc744 \uc815\ud558\ub358 \ub2f9\uc2dc x86\ubcf4\ub2e4 Sparc \uc2dc\uc2a4\ud15c\uc744 \ud558\uc774\uc5d4\ub4dc \uc6a9\ub3c4\ub85c \uc0ac\uc6a9\ud588\uae30 \ub54c\ubb38\uc774\ub2e4. \uc694\uc998\uc740 x86 \uc11c\ubc84 \uc0ac\uc6a9\uc774 \ud754\ud574\uc84c\uace0 \uc131\ub2a5 \ub610\ud55c \ud5a5\uc0c1\ub410\uae30 \ub54c\ubb38\uc5d0 Sparc server\uc5d0 \uc900\ud558\ub294 \uac12\uc778 2 \ub610\ub294 3 \uc815\ub3c4\ub97c \uc9c0\uc815\ud558\ub294 \uac83\uc774 \uc88b\ub2e4.<\/span><\/p>\n

NewRatio \ub300\uc2e0 NewSize\uc640 MaxNewSize\ub97c \uc9c0\uc815\ud560 \uc218\ub3c4 \uc788\ub2e4. NewSize\uc5d0\uc11c \uc9c0\uc815\ud55c \uac12\ub9cc\ud07c New \uc601\uc5ed\uc774 \uc0dd\uc131\ub410\ub2e4\uac00 MaxNewSize\uc5d0\uc11c \uc9c0\uc815\ud55c \ub9cc\ud07c New \uc601\uc5ed\uc774 \ucee4\uc9c4\ub2e4. Eden\uc774\ub098 \uc11c\ubc14\uc774\ubc84 \ub610\ud55c \uc9c0\uc815\ub41c \ub610\ub294 \uae30\ubcf8 \ube44\uc728\uc5d0 \ub530\ub77c \uac19\uc774 \ucee4\uc9c4\ub2e4. Xs\uc640 Xmx \ud06c\uae30\ub97c \uac19\uac8c \ud558\ub294 \uac83\ucc98\ub7fc NewSize\uc640 MaxNewSize \ub610\ud55c \uac19\uac8c \uc9c0\uc815\ud558\ub294 \uac83\uc774 \uc88b\ub2e4.<\/span><\/p>\n

NewRatio\uc640 NewSize\ub97c \uc9c0\uc815\ud588\uc744 \ub54c\ub294 \ub458 \uc911 \ud070 \uac12\uc744 \uc0ac\uc6a9\ud558\uae30 \ub54c\ubb38\uc5d0 \ud799\uc774 \uc0dd\uc131\ub410\uc744 \ub54c \ucd5c\ucd08\uc758 New \uc601\uc5ed\uc758 \ud06c\uae30\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/span><\/p>\n

min(MaxNewSize, max(NewSize, heap\/(NewRatio+1)))<\/span><\/p>\n

\uc804\uccb4 \ud799\uacfc New \uc601\uc5ed\uc758 \uc801\ud569\ud55c \ud06c\uae30\ub97c \ud55c \ubc88\uc5d0 \uc54c \uc218\ub294 \uc5c6\ub2e4. \uc6f9 \uc11c\ubc84 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uae30\uc900\uc73c\ub85c <\ud45c 3>\uacfc \uac19\uc740 JVM \uc635\uc158\uc73c\ub85c \uc790\ubc14 \uc560\ud50c\ub9ac\ucf00\uc774\uc158\uc744 \uac00\ub3d9\ud574\ubcf4\ub294 \uac83\uc744 \uad8c\ud55c\ub2e4. \uc774 \uc635\uc158\ub4e4\ub85c \uc131\ub2a5\uc744 \ubaa8\ub2c8\ud130\ub9c1\ud55c \ud6c4 \ub354 \uc801\ud569\ud55c GC \uc54c\uace0\ub9ac\uc998\uc774\ub098 \uc635\uc158\uc73c\ub85c \ubcc0\uacbd\ud558\uc790.<\/span><\/p>\n

\ud45c 3 \ubaa8\ub2c8\ud130\ub9c1 \ud6c4 \uc635\uc158\ubcc0\uacbd \uc608\uc2dc<\/span><\/p>\n
\uc885\ub958<\/span><\/td>\uc635\uc158<\/span><\/td><\/tr>
\ub3d9\uc791 \ubaa8\ub4dc<\/span><\/td>-sever<\/span><\/td><\/tr>
\uc804\uccb4 \ud799 \ud06c\uae30<\/span><\/td>-Xms\uc640 \u2013Xmx\uc758 \uac12\uc744 \uac19\uac8c<\/span><\/td><\/tr>
New \uc601\uc5ed \ud06c\uae30<\/span><\/td>-XX:NewRatio 2~4 \uc815\ub3c4\uc758 \uac12<\/span><\/td><\/tr>
<\/td>-XX:NewSize=?<\/span>
\u2013XX:MaxNewSize=?<\/span>
NewRatio \ub300\uc2e0 NewSize\ub97c \uc9c0\uc815\ud558\ub294 \uac83\ub3c4 \uc88b\ub2e4.<\/span><\/td><\/tr>
Perm \ud06c\uae30<\/span><\/td>-XX:PermSize=256m<\/span>
-XX:MaxPermSize=256m<\/span>
\uc131\ub2a5\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce58\uc9c0 \uc54a\uc73c\ubbc0\ub85c \ub3d9\uc791\uc5d0 \ubb38\uc81c\uac00 \uc5c6\uc744 \uc815\ub3c4\ub9cc \uc9c0\uc815\ud55c\ub2e4.<\/span><\/td><\/tr>
GC \ub85c\uadf8<\/span><\/td>-Xloggc:$CATALINA_BASE\/logs\/gc.log<\/span>
-XX:+PrintGCDetails<\/span>
-XX:+PrintGCDateStamps<\/span>
GC\ub85c\uadf8\ub97c \ub0a8\uae30\ub294 \uac83\uc740 \ud2b9\ubcc4\ud788 Java \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc218\ud589 \uc131\ub2a5\uc5d0 \uc601\ud5a5\uc744 \ubbf8\uce58\uc9c0 \uc54a\ub294\ub2e4. \uac00\uae09\uc801\uc774\uba74 GC \ub85c\uadf8\ub97c \ub0a8\uae30\ub294 \uac83\uc774 \uc88b\ub2e4.<\/span><\/td><\/tr>
GC \uc54c\uace0\ub9ac\uc998<\/span><\/td>-XX:+UseParNewGC<\/span>
-XX:+CMSParallelRemarkEnabled<\/span>
-XX:+UseConcMarkSweepGC<\/span>
-XX:CMSInitiatingOccupancyFraction=75<\/span>
\uc77c\ubc18\uc801\uc73c\ub85c \uad8c\ud560\ub9cc\ud55c \uc124\uc815\uc77c \ubfd0\uc774\ub2e4. \uc560\ud50c\ub9ac\ucf00\uc774\uc158 \ud2b9\uc131\uc5d0 \ub530\ub77c \ub2e4\ub978 \uc120\ud0dd\uc774 \ub354 \uc88b\uc744 \uc218 \uc788\ub2e4.<\/span><\/td><\/tr>
OOM \uc5d0\ub7ec \ubc1c\uc0dd \uc2dc \ud799 \ub364\ud504 \uc0dd\uc131<\/span><\/td>-XX:+HeapDumpOnOutOfMemoryError<\/span>
-XX:HeapDumpPath=$CATALINA_BASE\/logs<\/span><\/td><\/tr>
OOM \ubc1c\uc0dd \uc774\ud6c4 \uc870\uce58<\/span><\/td>-XX:OnOutOfMemoryError=$CATALINA_HOME\/bin\/stop.sh \ub610\ub294<\/span>
-XX:OnOutOfMemoryError=$CATALINA_HOME\/bin\/restart.sh \ud799 \ub364\ud504\ub97c \ub0a8\uae34 \ub4a4, \uad00\ub9ac \uc815\ucc45\uc5d0 \ub9de\uac8c \uc801\ud569\ud55c \ub3d9\uc791\uc744 \ucde8\ud560 \uc218 \uc788\ub3c4\ub85d \ud55c\ub2e4.<\/span><\/td><\/tr><\/tbody><\/table>

\uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5 \uce21\uc815<\/span><\/h2>

\uc560\ud50c\ub9ac\ucf00\uc774\uc158 \uc131\ub2a5\uc744 \uce21\uc815\ud558\uae30 \uc704\ud574 \ud30c\uc545\ud574\uc57c \ud560 \uc815\ubcf4\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/span><\/p>\n