{"id":718,"date":"2008-07-07T16:18:00","date_gmt":"2008-07-07T07:18:00","guid":{"rendered":"http:\/\/www.gisdeveloper.co.kr\/?p=718"},"modified":"2017-01-31T19:48:09","modified_gmt":"2017-01-31T10:48:09","slug":"openmp-%ec%86%8c%ea%b0%9c","status":"publish","type":"post","link":"http:\/\/www.gisdeveloper.co.kr\/?p=718","title":{"rendered":"\uac04\ub2e8\ud55c \uc608\ub85c \uc0b4\ud3b4\ubcf8, OpenMP"},"content":{"rendered":"

\ud544\uc790\uac00 OpenMP\uc774\ub77c\ub294 \ub2e8\uc5b4\ub97c \ucc98\uc74c \ub4e4\uc5c8\uc744\ub54c\ub294, \ubcf4\ub2e4 \uc548\uc815\uc801\uc778 \uba40\ud2f0 \uc2a4\ub808\ub4dc \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0 \ub300\ud55c \uac08\uc99d\uc774 \ud55c\ucc3d\uc77c \ub54c\uc600\uc2b5\ub2c8\ub2e4. XGE \uac1c\ubc1c \ucd08\uae30\uc5d0 \ub370\uc774\ud130 \uc694\uccad\uacfc \ub370\uc774\ud130 \uac00\uc2dc\ud654\ub97c \ubcc4\ub3c4\uc758 \uc2a4\ub808\ub4dc\ub85c \ub450\uace0, \ub2e4\uc2dc \ub370\uc774\ud130 \uc694\uccad\uc744 \ub808\uc774\uc5b4 \ub2e8\uc704\ub85c \ub098\ub204\uc5b4 \ub2e4\uc2dc \ub808\uc774\uc5b4\ub97c \ubcc4\ub3c4\uc758 \uc2a4\ub808\ub4dc\ub85c \ubd84\ub9ac\uc2dc\ucf1c\uc57c\ud560 \ud544\uc694\uc131\uc5d0\uc11c\uc600\ub294\ub370\uc694. \uadf8\ub7ec\ub2e4\uac00 \ucc3e\uc740 \uac83\uc774 OpenMP \uc774\uc600\uc2b5\ub2c8\ub2e4. \ucc98\uc74c \uc811\ud558\ub294 \uae30\uc220\uc778\uc9c0\ub77c… \uc2e4\uc81c \ud504\ub85c\uc81d\ud2b8\uc5d0 \uc801\uc6a9\ud558\uc9c0 \uc54a\uace0 \uc77c\ub2e8 \uba38\ub9ac\uc18d\uc5d0 \ubd81\ub9c8\ud06c\ub9cc \ud574 \ub450\uc5c8\uc9c0\uc694.<\/p>\n

\ucd5c\uadfc\uc5d0 \ub2e4\uc2dc \ubaa8 \uc7a1\uc9c0\uc5d0\uc11c OpenMP\ub77c\ub294 \ub2e8\uc5b4\ub97c \uc811\ud558\uac8c \ub418\uc5c8\ub294\ub370, \uc694\uc998 CPU\uac00 \uc8c4\ub2e4 \ub4c0\uc5bc\ucf54\uc5b4\ub2c8, \ucffc\ub4dc\ucf54\uc5b4\ub2c8… \uc5bc\ub9c8\ud6c4\uc5d0\ub294 \uc625\ud0c0\ucf54\uc5b4\uc640 \uac19\uc774 \ud558\ub098\uc758 CPU\uac00 2\uac1c, 4\uac1c, 8\uac1c\uc758 CPU\uc758 \uc131\ub2a5\uc744 \ub0bc \uc218 \uc788\ub294 \ucef4\ud4e8\ud305 \ud658\uacbd\uc774\uace0, \uc774\ub7f0 \ucef4\ud4e8\ud305 \ub9ac\uc18c\uc2a4\ub97c 100% \ud65c\uc6a9\ud558\uae30 \uc704\ud574 \ubcd1\ub82c \ud504\ub85c\uc138\uc2f1, \ub2e4\uc911 \uc2a4\ub808\ub4dc, \ub2e4\uc911 \ud504\ub85c\uc138\uc2f1 \uac1c\ubc1c \uae30\ubc95\uc744 \uc18d\uc18d\ub4e4\uc774 \uc801\uc6a9\ud558\uace0 \uc788\uace0, \uc774 \uae30\ubc95\uc774\ub77c\ub294\uac8c \uc5ed\uc0ac\ub77c \ubd88\ub9ac\ub294 \uc2dc\uac04\uc5d0\uc11c \uc9c0\uae08\uc5d0 \uc774\ub974\uae30\uae4c\uc9c0 \uc874\uc7ac\ud558\ub294 \uc2a4\ub808\ub4dc\ub97c \uc774\uc6a9\ud55c \ubc29\ubc95\uc785\ub2c8\ub2e4. \uc5ec\uae30\uc5d0 \uac04\ub2e8\ud788 \uc2a4\ub808\ub4dc\ub97c \uc9c1\uc811 \uc0ac\uc6a9\ud558\uc9c0 \uc54a\uace0 \uac04\ub2e8\/\uba85\ub8cc\ud55c, \ud558\uc9c0\ub9cc \uc544\uc9c1\uc740 \uc12c\uc138\ud558\uc9c0\ub294 \uc54a\ub294 \uba40\ud2f0 \ud504\ub85c\uc138\uc2f1 \ubc29\ubc95\uc778 OpenMP\ub77c\ub294 \uae30\uc220\uc774 \uc218\ub144\uc804\uc5d0 \ub098\ud0c0\ub0ac\ub294\ub370, \uc774 \uae00\uc740 \uac04\ub2e8\ud55c \uc608\ub85c OpenMP\ub97c \uc811\ud574 \ubcf4\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

\uba3c\uc800 \uace0\uac1d\uc73c\ub85c\ubd80\ud130 \ubc1b\uc740 \ud558\ub098\uc758 \uc694\uccad\uc744 \uc608\ub85c OpenMP\uc758 \uae30\ub2a5\uc744 \ub290\uaef4\ubcf4\ub294 \uac83\uc774 \uac00\uc7a5 \uc88b\uc740 \uc811\uadfc\ubc95 \uac19\uc2b5\ub2c8\ub2e4. \uc694\uccad\uc740 \ud14c\uc77c\ub7ec\uae09\uc218\ub97c \uc774\uc6a9\ud574 \uc790\uc5f0\ub85c\uadf8\uc5d0\uc11c\uc758 e\uc640 \ud30c\uc774(3.1415~)\ub97c \uad6c\ud558\uace0 \uc774 \ub458\uc758 \uac12\uc744 \ud569\ud574 \ubcf4\ub294 \uac83\uc785\ub2c8\ub2e4. \uc65c \uc774\ub7f0\uac83\uc774 \ud544\uc694\ud55c\uc9c0\ub294 \uc0dd\uac01\ud558\uc9c0 \ub9d0\uace0 \ub9d0\uc785\ub2c8\ub2e4. ^^; \uc774 \uc608\ub294 http:\/\/www.kallipolis.com\/openmp\/1.html<\/a> \uc758 OpenMP\uc758 Tutorial\uc5d0\uc11c \uac00\uc838\uc654\uc74c\uc744 \uba85\ud655\ud788 \ud569\ub2c8\ub2e4. \uc704\uc758 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574\uc11c\ub294 \uba3c\uc800 e\ub97c \uad6c\ud558\uace0 \ub2e4\uc74c\uc73c\ub85c phi\ub97c \uad6c\ud55c\ud6c4\uc5d0 \ub9c8\uc9c0\ub9c9\uc73c\ub85c e\uc640 phi\ub97c \ud569\ud558\uba74 \ub05d\ub0a9\ub2c8\ub2e4. \ubaa8\ub450 3\ub2e8\uacc4\ub85c \ub098\ub220\uc9c0\ub294\ub370, \ubc14\ub85c \uc544\ub798\uc640 \uac19\uc774 \ub9d0\uc785\ub2c8\ub2e4.<\/p>\n

    \n
  1. e\ub97c \uad6c\ud55c\ub2e4.<\/li>\n
  2. phi\ub97c \uad6c\ud55c\ub2e4.<\/li>\n
  3. e\uc640 phi\ub97c \ud569\ud55c\ub2e4.<\/li>\n<\/ol>\n

    \uc704\uc758 3 \ub2e8\uacc4\ub97c \uc790\uc138\ud788 \uc0b4\ud3b4\ubcf4\uba74, 3\ub2e8\uacc4\ub294 1\ub2e8\uacc4\uc640 2\ub2e8\uacc4\uac00 \ubc18\ub4dc\uc2dc \uc774\ub904\uc838\uc57c \ud558\uc9c0\ub9cc, 1\ub2e8\uacc4\uc640 2\ub2e8\uacc4\ub294 \uc644\uc804\ud788 \uc11c\ub85c \ub3c5\ub9bd\uc801\uc774\ub77c\ub294 \uc810\uc785\ub2c8\ub2e4. \ubc14\ub85c \uc5ec\uae30\uc11c 1\ub2e8\uacc4\uc640 2\ub2e8\uacc4\ub97c 2\uac1c\uc758 \uc2a4\ub808\ub4dc\ub85c \ubd84\ub9ac\ud574 \uc131\ub2a5\uc744 \ub192\uc77c \uc218 \uc788\ub2e4\ub294 \uac83\uc77c \uc54c \uc218 \uc788\uc2b5\ub2c8\ub2e4. 2\uac1c\uc758 \uc2a4\ub808\ub4dc\ub85c \ubd84\ub9ac\ud558\ub294 \ubc29\ubc95\uc740 \uc9c1\uc811 \uac1c\ubc1c\uc790\uac00 \uc2a4\ub808\ub4dc API\ub97c \uc0ac\uc6a9\ud574\uc11c \ubd84\ub9ac\uc2dc\ud0ac \uc218 \uc788\ub294 \ubc29\ubc95\uacfc OpenMP\ub97c \uc0ac\uc6a9\ud574\uc11c \uadf8 \ubd84\ub9ac \uc791\uc5c5\uc744 \ub9e1\uae30\ub294 \ubc29\ubc95\uc774 \uc788\uc2b5\ub2c8\ub2e4. \uc5ec\uae30\uc11c\ub294 \ubb3c\ub860~ OpenMP\ub97c \uc0ac\uc6a9\ud574 \ub450\uac1c\uc758 \uc2a4\ub808\ub4dc\ub85c \ubd84\ub9ac\ud574 \ubcf4\uaca0\uc2b5\ub2c8\ub2e4.<\/p>\n

    #include \"stdafx.h\"\r\n#include  \r\n#include  \r\n \r\n#define num_steps 20000000 \r\n\r\nint main(int argc, char *argv[])\r\n{\r\n    double start, stop;\r\n    double e, pi, factorial, product;\r\n    int i;\r\n\r\n    start = clock();\r\n\r\n    #pragma omp parallel sections num_threads(2)\r\n    {\r\n        #pragma omp section\r\n        {\r\n\r\n            printf(\"e started\\n\"); \/\/ 1. \ub2e8\uacc4: e\uad6c\ud558\uae30\r\n            e = 1;\r\n            factorial = 1;\r\n\r\n            for (i = 1; i<num_steps; i++) {\r\n                factorial *= i;\r\n                e += 1.0\/factorial;\r\n            }\r\n\r\n            printf(\"e(%lf) done\\n\", e);\r\n        }\r\n\r\n        #pragma omp section\r\n        {\r\n            printf(\"pi started\\n\"); \/\/ 2. \ub2e8\uacc4: phi \uad6c\ud558\uae30\r\n\r\n            pi = 0;\r\n            for (i = 0; i < num_steps*10; i++) {\r\n                pi += 1.0\/(i*4.0 + 1.0);\r\n                pi -= 1.0\/(i*4.0 + 3.0);\r\n            }\r\n\r\n            pi = pi * 4.0;\r\n            printf(\"pi(%lf) done\\n\", pi);\r\n        }\r\n    }\r\n    product = e + pi; \/\/ 3. \ub2e8\uacc4: e\uc640 phi \ud569\ud558\uae30\r\n\r\n    stop = clock();\r\n\r\n    printf(\"Reached result %f in %.3f seconds\\n\", \r\n        product, (stop-start)\/1000);\r\n\r\n    return 0;\r\n}<\/pre>\n
    \uba3c\uc800 \uc0b4\ud3b4 \ubcfc \uac83\uc774 #pragma omp parallel sections num_threads(2)\uc778\ub370, \uc774 #pragma\ub294 2\uac1c\uc758 \uc2a4\ub808\ub4dc(num_threads(2))\ub85c \uc2e4\ud589 \uad6c\uc5ed(section)\uc744 \ub098\ub204\uaca0\ub2e4\ub294 \uc758\ubbf8\uc785\ub2c8\ub2e4. \uadf8 \uc2e4\ud589 \uad6c\uc5ed\uc774\ub77c\ub294 \uac83\uc774 \ub2e4\ub984 \uc544\ub2cc e\uc640 phi\ub97c \uad6c\ud558\ub294 \uac83\uc778\ub370, \uc774 \uc2e4\ud589 \uad6c\uc5ed, \uc989 section\uc744 \uc815\ud558\ub294 \ucf54\ub4dc\uac00 \ubc14\ub85c \ub2e4\uc74c \ucf54\ub4dc\uc5d0 2\ubc88 \ub098\uc624\ub294 #pragma section \ube14\ub7ed\uc785\ub2c8\ub2e4. \uc774 \ube14\ub7ed\uc740 \uc815\ud655\ud788 e\uc640 phi\ub97c \uad6c\ud558\ub294 \ucf54\ub4dc\uc785\ub2c8\ub2e4.<\/p>\n
    \uc5ec\uae30\uc11c \uc911\uc694\ud55c \uac83\uc740 \ub3d9\uae30\ud654\uc778\ub370, e\uc640 phi\ub97c \uacc4\uc0b0\ud574\uc11c \ud569\ud558\ub294 \uac83\uc774 \ucd5c\uc885\uc801\uc778 \ubaa9\ud45c\uc774\ubbc0\ub85c e\uc758 \uacc4\uc0b0\uacfc phi\uc758 \uacc4\uc0b0\uc774 \uc644\uc804\uc774 \uc644\ub8cc\ub418\uc5b4\uc57c\ub9cc e\uc640 phi\ub97c \ud569\ud560 \uc218\uac00 \uc788\ub2e4. OpenMP\ub294 #pragma omp parallel sections num_threads\ub97c \ud1b5\ud574 \uc774 \uc804\ucc98\ub9ac\uac00 \uaddc\uc815\ud55c \ube14\ub7ed\uc758 \ucf54\ub4dc\ub97c \uc790\ub3d9\uc73c\ub85c \ub3d9\uae30\ud654 \uc2dc\ucf1c\uc90d\ub2c8\ub2e4!! ^^ \uc640\uc6b0~<\/p>\n
    \uc5ec\uae30\uc11c \ub208\uce58\uac00 \ube60\ub978 \uc0ac\ub78c\uc774\ub77c\uba74, \uc704\uc758 \ucf54\ub4dc\uc5d0\uc11c OpenMP\uc640 \uad00\ub828\ub41c \ucf54\ub4dc\ub97c \uc81c\uac70\ud574\ub3c4 \ub3d9\uc77c\ud55c \uacb0\uacfc\ub97c \ub0b8\ub2e4\ub294 \uac83\uc785\ub2c8\ub2e4. \ubb3c\ub860, \uc2f1\uae00 \uc2a4\ub808\ub4dc\ub85c \ub3cc\uc544\uac00\ubbc0\ub85c\u00a0 \uc218\ud589 \uc18d\ub3c4\ub294 \uc800\ud558\ub418\uaca0\uc9c0\ub9cc \ub9d0\uc785\ub2c8\ub2e4. \uc989, \uc774\ub97c \ub2e4\uc2dc \uc5ed\uc73c\ub85c \uc0dd\uac01\ud574\ubcf4\uba74, \uae30\uc874\uc5d0 \uc804\ud600 \uba40\ud2f0 \ud504\ub85c\uc138\uc2f1\uc744 \uace0\ub824\ud558\uc9c0 \uc54a\uace0 \uac1c\ubc1c\ub41c \ucf54\ub4dc\uc5d0 \ub300\ud574\uc11c OpenMP\ub97c \uc801\uc808\ud558\uac8c \uc801\uc6a9\ud558\uba74 \ud070 \ucf54\ub4dc\uc758 \ubcc0\uacbd \uc5c6\uc774\ub3c4 \uba40\ud2f0 \ud504\ub85c\uc138\uc2f1\uc758 \uc787\uc810\uc744 \ucd94\uac00\ud560 \uc218 \uc788\ub2e4\ub294 \uc810\uc774\uaca0\uc9c0\uc694. \ud544\uc790\uc758 \ucd94\uce21\uc73c\ub85c OpenMP\ub77c\ub294 \uae30\uc220\uc740 \uc544\ub9c8\ub3c4… \uae30\uc874\uc758 \uc2f1\uae00 \uc2a4\ub808\ub4dc\ub85c \uc791\ub3d9\ud558\ub294 \uc18c\ud504\ud2b8\uc6e8\uc5b4\uc5d0 \ub300\ud574\uc11c, \uba40\ud2f0\ucf54\uc5b4 CPU\uc758 \ub4f1\uc7a5\uc73c\ub85c \uadf8 \ud558\ub4dc\uc6e8\uc5b4\uc758 \uc131\ub2a5\uc744 \ucd5c\ub300\ud55c \ub04c\uc5b4\ub0b4\uae30 \uc704\ud574 \ub4f1\uc7a5\ud55c \uae30\uc220\ub85c \ubcf4\uc785\ub2c8\ub2e4.<\/p>\n
    \uac04\ub2e8\ud558\uac8c \uc608\ub97c \ub4e4\uc5b4 OpenMP\ub97c \uc0b4\ud3b4\ubcf4\uc558\uc2b5\ub2c8\ub2e4. \uc774\uae00\uc740 OpenMP\uc758 \ub9ce\uc740 \uae30\ub2a5 \uc911\uc5d0 \ub9e4\uc6b0 \uac04\ub2e8\ud558\uace0 \uae30\ubcf8\uc801\uc778 \uc608\ub97c \ub4e0 \uac83\uc785\ub2c8\ub2e4. \ucd94\ud6c4 \uae30\ud68c\uac00 \ub41c\ub2e4\uba74 \ub354 \ub9ce\uc740 OpenMP\uc758 \uc815\ubcf4\ub97c \uc81c\uacf5\ud560 \uc218 \uc788\ub3c4\ub85d \ud558\uaca0\uc2b5\ub2c8\ub2e4. \uadf8\ub54c\uae4c\uc9c0 \ucc38\uc9c0 \ubabb\ud558\uaca0\ub2e4\uba74, http:\/\/www.kallipolis.com\/openmp\/index.html<\/a> \ub97c \ucc38\uace0\ud558\uae38 \ubc14\ub78d\ub2c8\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"
    \ud544\uc790\uac00 OpenMP\uc774\ub77c\ub294 \ub2e8\uc5b4\ub97c \ucc98\uc74c \ub4e4\uc5c8\uc744\ub54c\ub294, \ubcf4\ub2e4 \uc548\uc815\uc801\uc778 \uba40\ud2f0 \uc2a4\ub808\ub4dc \ud504\ub85c\uadf8\ub798\ubc0d\uc5d0 \ub300\ud55c \uac08\uc99d\uc774 \ud55c\ucc3d\uc77c \ub54c\uc600\uc2b5\ub2c8\ub2e4. XGE \uac1c\ubc1c \ucd08\uae30\uc5d0 \ub370\uc774\ud130 \uc694\uccad\uacfc \ub370\uc774\ud130 \uac00\uc2dc\ud654\ub97c \ubcc4\ub3c4\uc758 \uc2a4\ub808\ub4dc\ub85c \ub450\uace0, \ub2e4\uc2dc \ub370\uc774\ud130 \uc694\uccad\uc744 \ub808\uc774\uc5b4 \ub2e8\uc704\ub85c \ub098\ub204\uc5b4 \ub2e4\uc2dc \ub808\uc774\uc5b4\ub97c \ubcc4\ub3c4\uc758 \uc2a4\ub808\ub4dc\ub85c \ubd84\ub9ac\uc2dc\ucf1c\uc57c\ud560 \ud544\uc694\uc131\uc5d0\uc11c\uc600\ub294\ub370\uc694. \uadf8\ub7ec\ub2e4\uac00 \ucc3e\uc740 \uac83\uc774 OpenMP \uc774\uc600\uc2b5\ub2c8\ub2e4. \ucc98\uc74c \uc811\ud558\ub294 \uae30\uc220\uc778\uc9c0\ub77c… \uc2e4\uc81c \ud504\ub85c\uc81d\ud2b8\uc5d0 \uc801\uc6a9\ud558\uc9c0 \uc54a\uace0 \uc77c\ub2e8 \uba38\ub9ac\uc18d\uc5d0 \ubd81\ub9c8\ud06c\ub9cc \ud574 \ub450\uc5c8\uc9c0\uc694. \ucd5c\uadfc\uc5d0 \ub2e4\uc2dc … <\/p>\n
    \ub354 \ubcf4\uae30 “\uac04\ub2e8\ud55c \uc608\ub85c \uc0b4\ud3b4\ubcf8, OpenMP”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[117,8],"tags":[41],"class_list":["post-718","post","type-post","status-publish","format-standard","hentry","category-cpp","category-programming","tag-openmp"],"_links":{"self":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/718","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=718"}],"version-history":[{"count":3,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/718\/revisions"}],"predecessor-version":[{"id":3497,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=\/wp\/v2\/posts\/718\/revisions\/3497"}],"wp:attachment":[{"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=718"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.gisdeveloper.co.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}