{"id":2625,"date":"2023-01-14T21:30:53","date_gmt":"2023-01-14T20:30:53","guid":{"rendered":"https:\/\/ff.mhrooz.xyz\/?p=2625"},"modified":"2023-01-14T21:30:54","modified_gmt":"2023-01-14T20:30:54","slug":"openmp_sections","status":"publish","type":"post","link":"https:\/\/blog.mhrooz.xyz\/index.php\/2023\/01\/14\/openmp_sections\/","title":{"rendered":"OpenMP: Sections"},"content":{"rendered":"\n

Openmp: Section<\/h2>\n

\u5148\u524d\uff0c\u6211\u4eec\u7528OpenMP\u4e2d\u7684for\u5b50\u53e5\u53ef\u4ee5\u5bf9\u5faa\u73af\u8fdb\u884c\u5e76\u884c\u3002\u5faa\u73af\u91cc\u7684\u4ee3\u7801\u901a\u5e38\u662f\u4e00\u6837\u7684\u3002\u90a3\u4e48\u5982\u679c\u60f3\u5e76\u884c\u8fd0\u884c\u4e0d\u540c\u7684\u4ee3\u7801\uff0c\u6211\u4eec\u5c31\u8981\u4f7f\u7528Section\u5b50\u53e5\u3002<\/p>\n

\u4f8b\u5b50:<\/p>\n

#pragma omp parallel \n{\n    #pragma omp sections\n    {\n        #pragma omp section\n        {\n            \/\/ structured block 1\n        }\n        \n        #pragma omp section\n        {\n            \/\/ structured block 2\n        }\n\n        #pragma omp section\n        {\n            \/\/ structured block 3\n        }           \n        \n        ...\n    }\n}\n<\/code><\/pre>\n
parallel<\/code>\u8bed\u53e5\u521b\u5efa\u4e86\u7ebf\u7a0b\u961f\uff0c\u5176\u4e2d\u7684\u7ebf\u7a0b\u90fd\u7528\u6765\u5e76\u884c\u6267\u884c\u3002<\/p>\n
sections<\/code>\u8bed\u53e5\u6807\u8bb0\u4e86section\u7ed3\u6784\u7684\u5f00\u59cb\u3002\u8fd9\u4e2a\u5757\u91cc\u5c06\u4f1a\u5305\u542b\u6570\u4e2asection<\/code>\u7ed3\u6784\uff0c\u6bcf\u4e2asection<\/code>\u90fd\u6807\u8bb0\u4e86\u4e0d\u540c\u7684\u5757\uff0c\u4e5f\u4ee3\u8868\u4e86 \u4e00\u4e2a\u4efb\u52a1\u3002\u6ce8\u610f\uff0c\u4e00\u5b9a\u8981\u533a\u5206\u597dsection<\/code>\u548csections<\/code>\uff0c\u8fd9\u4e24\u4e2a\u6709\u4e0d\u540c\u7684\u610f\u601d\u3002<\/p>\n
sections<\/code>\u7ed3\u6784\u8981\u6c42\u4e0d\u540c\u7684section<\/code>\u4e4b\u95f4\u5fc5\u987b\u72ec\u7acb\u4e8e\u5176\u4ed6\u5757\uff0c\u7136\u540e\u6bcf\u4e2a\u7ebf\u7a0b\u4e00\u6b21\u6267\u884c\u4e00\u4e2a\u5757\uff0c\u6bcf\u4e2a\u5757\u4ec5\u7531\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u4e00\u6b21\u3002<\/p>\n
OpenMP\u5e76\u6ca1\u6709\u89c4\u5b9a\u8fd9\u4e9b\u5757\u7684\u6267\u884c\u987a\u5e8f\u3002\u5982\u679c\u4efb\u52a1\u591a\u4e8e\u7ebf\u7a0b\uff0c\u4e00\u4e9b\u7ebf\u7a0b\u5c06\u6267\u884c\u591a\u4e2a\u5757\uff0c\u5982\u679c\u7ebf\u7a0b\u591a\u4e8e\u4efb\u52a1\uff0c\u4e00\u4e9b\u7ebf\u7a0b\u5c06\u4f1a\u7a7a\u95f2\u3002<\/p>\n
\u5982\u679cparallel<\/code>\u4e2d\u53ea\u6709\u4e00\u4e2asections<\/code>\u5757\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u5408\u5e76<\/p>\n
#pragma omp parallel sections\n{\n    ...\n}\n<\/code><\/pre>\n
\u53c2\u770b\uff1ahttp:\/\/www.openmp.org\/mp-documents\/openmp-4.5.pdf<\/a><\/p>\n
Example<\/h3>\n
void function_1()\n{\n    for (int i = 0; i != 3; i++)\n    {\n        std::cout << "Function 1 (i = " << i << ")" << std::endl;\n        std::this_thread::sleep_for(std::chrono::seconds(1));\n    }\n}\n\nvoid function_2()\n{\n    for (int j = 0; j != 4; j++)\n    {\n        std::this_thread::sleep_for(std::chrono::milliseconds(500));\n        std::cout << "                   Function 2 "\n                  << "(j = " << j << ")" << std::endl;\n    }\n}\n<\/code><\/pre>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u7ed9\u51fa\u4e86\u4e24\u4e2a\u51fd\u6570\uff0c\u6211\u4eec\u5728\u51fd\u6570\u91cc\u5b9e\u73b0\u4e86\u6253\u5370\u4fe1\u606f\u3002\u7136\u540e\u6211\u4eec\u7528sleep_for<\/code>\u51fd\u6570\u6765\u5ef6\u8fdf\u4e24\u6b21\u8fed\u4ee3\u4e4b\u95f4\u7684\u6253\u5370\u3002<\/p>\n
\u4e3b\u51fd\u6570\u4e3a:<\/p>\n
int main()\n{\n    #pragma omp parallel sections\n    {    \n        #pragma omp section\n        function_1();\n            \n        #pragma omp section\n        function_2();\n    }\n\n    return 0;\n}\n<\/code><\/pre>\n
\u7a0b\u5e8f\u4e00\u5f00\u59cb\uff0cOpenMP\u4f1a\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\u961f(team of threads)\uff0c\u7136\u540eOpenMp\u5c06\u4f1a\u5206\u914d\u53ef\u7528\u7684\u7ebf\u7a0b\u7ed9\u8fd9\u4e24\u4e2a\u51fd\u6570\u3002<\/p>\n
\u5982\u679c\u8bf4\u7ebf\u7a0b\u7684\u6570\u91cf\u591a\u4e8e1\uff0c\u90a3\u4e48\u7a0b\u5e8f\u8fd0\u884c\u5c31\u662f\u5e76\u884c\u7684\uff0c\u5982\u679c\u5c11\u4e8e1\uff0c\u7a0b\u5e8f\u4e32\u884c\u3002<\/p>\n
\u7a0b\u5e8f\u8f93\u51fa<\/p>\n
$ .\/ompSection \nFunction 1 (i = 0)\n                   Function 2 (j = 0)\nFunction 1 (i = 1)\n                   Function 2 (j = 1)\n                   Function 2 (j = 2)\nFunction 1 (i = 2)\n                   Function 2 (j = 3)\n<\/code><\/pre>\n
 <\/p>\n\n","protected":false},"excerpt":{"rendered":"
Openmp: Section \u5148\u524d\uff0c\u6211\u4eec\u7528OpenMP\u4e2d\u7684for\u5b50\u53e5\u53ef\u4ee5\u5bf9\u5faa\u73af\u8fdb\u884c\u5e76\u884c\u3002\u5faa\u73af\u91cc\u7684\u4ee3\u7801\u901a\u5e38\u662f\u4e00\u7ee7\u7eed\u9605\u8bfb“OpenMP: Sections”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[38,44],"tags":[71,47,70,69],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2625"}],"collection":[{"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=2625"}],"version-history":[{"count":1,"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2625\/revisions"}],"predecessor-version":[{"id":2626,"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2625\/revisions\/2626"}],"wp:attachment":[{"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=2625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=2625"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.mhrooz.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=2625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}