{"id":875,"date":"2021-12-19T00:00:31","date_gmt":"2021-12-18T16:00:31","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=875"},"modified":"2021-12-19T00:00:37","modified_gmt":"2021-12-18T16:00:37","slug":"openmp%e5%a4%9a%e7%ba%bf%e7%a8%8b%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=875","title":{"rendered":"OpenMP\u591a\u7ebf\u7a0b\u8bfb\u4e66\u7b14\u8bb0"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69e0e89956f1c\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e0e89956f1c\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#%E5%85%AB%E3%80%81OpenMP%E5%A4%9A%E7%BA%BF%E7%A8%8B%E7%BC%96%E7%A8%8B%E5%8F%8A%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96\" >\u516b\u3001OpenMP\u591a\u7ebf\u7a0b\u7f16\u7a0b\u53ca\u6027\u80fd\u4f18\u5316<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#OpenMP%E5%B7%A5%E4%BD%9C%E5%8E%9F%E7%90%86%E5%92%8C%E5%B7%A5%E4%BD%9C%E6%96%B9%E5%BC%8F\" >OpenMP\u5de5\u4f5c\u539f\u7406\u548c\u5de5\u4f5c\u65b9\u5f0f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#%E7%BC%96%E8%AF%91%E5%88%B6%E5%AF%BC%E8%AF%AD%E5%8F%A5\" >\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#%E4%BD%BF%E7%94%A8%E4%B8%BE%E4%BE%8B\" >\u4f7f\u7528\u4e3e\u4f8b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#1%E5%B9%B6%E8%A1%8C%E5%8C%BA%E5%9F%9F%E7%BC%96%E8%AF%91%E5%88%B6%E5%AF%BC%E8%AF%AD%E5%8F%A5\" >1.\u5e76\u884c\u533a\u57df\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#2%E6%8E%A7%E5%88%B6%E5%8F%98%E9%87%8F%E5%9C%A8%E7%BA%BF%E7%A8%8B%E9%97%B4%E7%9A%84%E5%85%B1%E4%BA%AB%E5%B1%9E%E6%80%A7\" >2.\u63a7\u5236\u53d8\u91cf\u5728\u7ebf\u7a0b\u95f4\u7684\u5171\u4eab\u5c5e\u6027<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#3%E5%B7%A5%E4%BD%9C%E5%88%86%E5%8C%BA%E7%BC%96%E7%A0%81sections\" >3.\u5de5\u4f5c\u5206\u533a\u7f16\u7801sections<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=875\/#4%E7%BA%BF%E7%A8%8B%E5%90%8C%E6%AD%A5\" >4.\u7ebf\u7a0b\u540c\u6b65<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\" id=\"%E5%85%ABopenmp%E5%A4%9A%E7%BA%BF%E7%A8%8B%E7%BC%96%E7%A8%8B%E5%8F%8A%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96\"><span class=\"ez-toc-section\" id=\"%E5%85%AB%E3%80%81OpenMP%E5%A4%9A%E7%BA%BF%E7%A8%8B%E7%BC%96%E7%A8%8B%E5%8F%8A%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96\"><\/span>\u516b\u3001OpenMP\u591a\u7ebf\u7a0b\u7f16\u7a0b\u53ca\u6027\u80fd\u4f18\u5316<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>OpenMP\u662f\u4e00\u79cd\u9762\u5411\u5171\u4eab\u5185\u5b58\u4ee5\u53ca\u5206\u5e03\u5f0f\u5171\u4eab\u5185\u5b58\u7684\u591a\u5904\u7406\u5668\u591a\u7ebf\u7a0b\u5e76\u884c\u7f16\u7a0b\u8bed\u8a00\u3002OpenMP\u662f\u4e00\u79cd\u80fd\u591f\u88ab\u7528\u4e8e\u663e\u793a\u5236\u5bfc\u591a\u7ebf\u7a0b\u3001\u5171\u4eab\u5185\u5b58\u5e76\u884c\u7684\u5e94\u7528\u7a0b\u5e8f\u7f16\u7a0b\u63a5\u53e3(API)\u3002<\/p><\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>OpenMP\u7684\u89c4\u8303\u7531SGI\u53d1\u8d77&#8230; OpenMP\u6700\u521d\u662f<strong>\u4e3a\u5171\u4eab\u5185\u5b58\u7684\u591a\u5904\u7406\u5668\u7cfb\u7edf\u8bbe\u8ba1<\/strong>\u7684\u5e76\u884c\u7f16\u7a0b\u65b9\u6cd5\uff0c\u8fd9\u4e0e<strong>\u901a\u8fc7\u6d88\u606f\u4f20\u9012\u8fdb\u884c\u5e76\u884c\u7f16\u7a0b\u7684\u6a21\u578b<\/strong>\u6709\u5f88\u5927\u7684\u4e0d\u540c\u3002<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"openmp%E5%B7%A5%E4%BD%9C%E5%8E%9F%E7%90%86%E5%92%8C%E5%B7%A5%E4%BD%9C%E6%96%B9%E5%BC%8F\"><span class=\"ez-toc-section\" id=\"OpenMP%E5%B7%A5%E4%BD%9C%E5%8E%9F%E7%90%86%E5%92%8C%E5%B7%A5%E4%BD%9C%E6%96%B9%E5%BC%8F\"><\/span>OpenMP\u5de5\u4f5c\u539f\u7406\u548c\u5de5\u4f5c\u65b9\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>OpenMP\u7684\u6267\u884c\u6a21\u5f0f\u91c7\u7528Fork-Join\u7684\u5f62\u5f0f\u3002<\/p><\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Fork-Join\u6267\u884c\u6a21\u5f0f\u5728\u5f00\u59cb\u6267\u884c\u7684\u65f6\u5019\uff0c\u53ea\u6709\u4e00\u4e2a\u53eb\u505a\u4e3b\u7ebf\u7a0b\u7684\u8fd0\u884c\u7ebf\u7a0b\u5728\u3002\u4e3b\u7ebf\u7a0b\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5f53\u9047\u5230\u9700\u8981\u8fdb\u884c\u5e76\u884c\u8ba1\u7b97\u7684\u65f6\u5019\uff0c\u6d3e\u751f\u51fa(Fork\uff0c\u521b\u5efa\u65b0\u7ebf\u7a0b\u6216\u8005\u4ece\u7ebf\u7a0b\u6c60\u4e2d\u5524\u9192\u5df2\u6709\u7ebf\u7a0b)\u7ebf\u7a0b\u6765\u6267\u884c\u5e76\u884c\u4efb\u52a1\u3002\u5728\u5e76\u884c\u6267\u884c\u7684\u65f6\u5019\uff0c\u4e3b\u7ebf\u7a0b\u548c\u6d3e\u751f\u7ebf\u7a0b\u5171\u540c\u5de5\u4f5c\u3002\u5728\u5e76\u884c\u4ee3\u7801\u7ed3\u675f\u6267\u884c\u540e\uff0c\u6d3e\u751f\u7ebf\u7a0b\u9000\u51fa\u6216\u8005\u6302\u8d77\uff0c\u4e0d\u518d\u5de5\u4f5c\uff0c\u63a7\u5236\u6d41\u7a0b\u56de\u5230\u5355\u72ec\u7684\u4e3b\u7ebf\u7a0b\u4e2d(Join\uff0c\u5373\u591a\u7ebf\u7a0b\u7684\u6c47\u5408)\u3002<\/p><\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\u4e3b\u7ebf\u7a0b\u5728\u8fd0\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u9047\u5230\u5e76\u884c\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\uff0c\u6839\u636e\u73af\u5883\u53d8\u91cf\u3001\u5b9e\u9645\u9700\u8981(\u6bd4\u5982\u5faa\u73af\u7684\u8fed\u4ee3\u6b21\u6570)\u6d3e\u751f\u51fa\u82e5\u5e72\u4e2a\u7ebf\u7a0b\u3002\u6b64\u65f6\uff0c\u6b64\u7ebf\u7a0b\u4e0e\u4e3b\u7ebf\u7a0b\u540c\u65f6\u8fd0\u884c\u3002\u5728\u8fd0\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u67d0\u4e00\u4e2a\u6d3e\u751f\u7ebf\u7a0b\u9047\u5230\u4e86\u53e6\u5916\u4e00\u4e2a\u5e76\u884c\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\uff0c\u6d3e\u751f\u51fa\u4e86\u53e6\u5916\u4e00\u7ec4\u7ebf\u7a0b\u3002\u65b0\u7684\u7ebf\u7a0b\u7ec4\u5171\u540c\u5b8c\u6210\u4e00\u9879\u4efb\u52a1\uff0c\u4f46\u5bf9\u4e8e\u539f\u6709\u7684\u7ebf\u7a0b\u6765\u8bf4\uff0c\u65b0\u7ebf\u7a0b\u7ec4\u7684\u5de5\u4f5c\u7c7b\u4f3c\u4e8e\u4e00\u5757\u4e32\u884c\u7a0b\u5e8f\uff0c\u5bf9\u539f\u6709\u7684\u7ebf\u7a0b\u4e0d\u4f1a\u4ea7\u751f\u5f71\u54cd\u3002\u65b0\u7ebf\u7a0b\u7ec4\u5728\u901a\u8fc7\u4e00\u4e2a\u9690\u542b\u7684\u540c\u6b65\u5c4f\u969c\u540e(barrier)\uff0c\u6c47\u5408(join)\u6210\u539f\u6709\u7684\u7ebf\u7a0b\u3002\u6700\u540e\uff0c\u539f\u6709\u7684\u7ebf\u7a0b\u7ec4\u6c47\u5408\u6210\u4e3b\u7ebf\u7a0b\uff0c\u6267\u884c\u5b8c\u6700\u540e\u7684\u7a0b\u5e8f\u4ee3\u7801\u5e76\u9000\u51fa\u3002<\/p><\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>OpenMP\u7a0b\u5e8f\u540c\u65f6\u7ed3\u5408\u4e86\u4e24\u79cd\u5e76\u884c\u7f16\u7a0b\u7684\u65b9\u5f0f\u3002\u901a\u8fc7\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u4e32\u884c\u7684\u7a0b\u5e8f\u9010\u6b65\u5730\u6539\u9020\u6210\u4e00\u4e2a\u5e76\u884c\u7a0b\u5e8f\uff0c\u8fbe\u5230\u589e\u91cf\u66f4\u65b0\u7a0b\u5e8f\u7684\u76ee\u7684\uff0c\u51cf\u5c11\u7a0b\u5e8f\u7f16\u5199\u4eba\u5458\u4e00\u5b9a\u7684\u8d1f\u62c5\u3002\u540c\u65f6\uff0c\u8fd9\u79cd\u65b9\u5f0f\u4e5f\u80fd\u591f\u5c06\u4e32\u884c\u7a0b\u5e8f\u548c\u5e76\u884c\u7a0b\u5e8f\u4fdd\u6301\u5728\u540c\u4e00\u4e2a\u6e90\u4ee3\u7801\u6587\u4ef6\u5f53\u4e2d\uff0c\u51cf\u5c11\u4e86\u7ef4\u62a4\u7684\u8d1f\u62c5\u3002\u4f46\u662f\uff0c\u7531\u4e8e\u662f\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\uff0c\u5176\u4f18\u52bf\u4f53\u73b0\u5728\u7f16\u8bd1\u7684\u9636\u6bb5\uff0c\u5bf9\u4e8e\u8fd0\u884c\u9636\u6bb5\u5219\u652f\u6301\u8f83\u5c11\u3002\u56e0\u6b64\uff0cOpenMP\u4e5f\u63d0\u4f9b\u4e86\u8fd0\u884c\u65f6\u5e93\u51fd\u6570\u6765\u652f\u6301\u8fd0\u884c\u65f6\u5bf9\u5e76\u884c\u73af\u5883\u7684\u6539\u53d8\u548c\u4f18\u5316\uff0c\u7ed9\u7f16\u7a0b\u4eba\u5458\u8db3\u591f\u7684\u7075\u6d3b\u6027\u6765\u63a7\u5236\u8fd0\u884c\u65f6\u7684\u7a0b\u5e8f\u8fd0\u884c\u72b6\u51b5\u3002\u3002\u4f46\u8fd9\u79cd\u65b9\u5f0f\u6253\u7834\u4e86\u6e90\u4ee3\u7801\u5728\u4e32\u884c\u548c\u5e76\u884c\u4e4b\u95f4\u7684\u4e00\u81f4\u6027\u3002<\/p><\/blockquote>\n\n\n\n<p>\u7b80\u8a00\u4e4b\uff0cOpenMP\u5e94\u7528\u7a0b\u5e8f\u75313\u4e2a\u90e8\u5206\u7ec4\u6210\uff1a\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\uff0c\u8fd0\u884c\u65f6\u5e93\u51fd\u6570\u4ee5\u53ca\u73af\u5883\u53d8\u91cf\u3002\u5176\u4e2d\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\u662fOpenMP\u7ec4\u6210\u4e2d\u6700\u91cd\u8981\u7684\u90e8\u5206\uff0c\u4e5f\u662f\u7f16\u5199OpenMP\u7a0b\u5e8f\u7684\u5173\u952e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E7%BC%96%E8%AF%91%E5%88%B6%E5%AF%BC%E8%AF%AD%E5%8F%A5\"><span class=\"ez-toc-section\" id=\"%E7%BC%96%E8%AF%91%E5%88%B6%E5%AF%BC%E8%AF%AD%E5%8F%A5\"><\/span>\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5728C\/C++\u7a0b\u5e8f\u4e2d\uff0cOpenMP\u7684\u6240\u6709\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\u4ee5<code>#pragma omp<\/code>\u5f00\u59cb\uff0c\u540e\u9762\u8ddf\u5177\u4f53\u7684\u529f\u80fd\u6307\u4ee4\u3002\u5373\u5177\u6709\u5982\u4e0b\u7684\u5f62\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#pragma omp &lt;directive&gt; [clause[[,]clause]...]\n<\/code><\/pre>\n\n\n\n<p><em>directive<\/em>\u90e8\u5206\u5305\u542b\u4e86\u5177\u4f53\u7684\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><em>parallel<\/em><\/li><li><em>for<\/em><\/li><li><em>parallel for<\/em><\/li><li><em>section<\/em><\/li><li><em>sections<\/em><\/li><li><em>single<\/em><\/li><li><em>master<\/em><\/li><li><em>critical<\/em><\/li><li><em>flush<\/em><\/li><li><em>ordered<\/em><\/li><li><em>atomic<\/em><\/li><\/ol>\n\n\n\n<p>5\u4e2a\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5(<em>master<\/em>,<em>critical<\/em>,<em>flush<\/em>,<em>ordered<\/em>,<em>atomic<\/em>)\u4e0d\u80fd\u8ddf\u76f8\u5e94\u7684\u5b50\u53e5\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E4%BD%BF%E7%94%A8%E4%B8%BE%E4%BE%8B\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8%E4%B8%BE%E4%BE%8B\"><\/span>\u4f7f\u7528\u4e3e\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5728\u6211\u7684Ubuntu18.04\u4e0a\u7528gcc7.3.0\u6d4b\u8bd5\u65f6\uff0c\u7f16\u8bd1\u65f6\u9700\u8981\u5e26\u4e0a<code>-fopenmp<\/code>\u53c2\u6570\uff0c\u7f16\u8bd1\u5668\u624d\u80fd\u751f\u6210\u76f8\u5e94\u7684\u5e76\u884c\u4ee3\u7801\uff0c\u5426\u5219\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\u4e0d\u4f1a\u8d77\u4f5c\u7528\u3002\u7f16\u8bd1\u51fa\u6765\u7684\u7a0b\u5e8f\u8fd0\u884c\u7ed3\u679c\u548c\u6ca1\u6709\u8fd9\u4e9b\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5\u5dee\u4e0d\u591a\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1%E5%B9%B6%E8%A1%8C%E5%8C%BA%E5%9F%9F%E7%BC%96%E8%AF%91%E5%88%B6%E5%AF%BC%E8%AF%AD%E5%8F%A5\"><span class=\"ez-toc-section\" id=\"1%E5%B9%B6%E8%A1%8C%E5%8C%BA%E5%9F%9F%E7%BC%96%E8%AF%91%E5%88%B6%E5%AF%BC%E8%AF%AD%E5%8F%A5\"><\/span>1.\u5e76\u884c\u533a\u57df\u7f16\u8bd1\u5236\u5bfc\u8bed\u53e5<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5bf9\u4e8e\u4e0b\u9762\u7684helloworld.c\u7a0b\u5e8f\uff0c\u7a0b\u5e8f\u5728\u6267\u884c\u5230<code>#pragma omp parallel<\/code>\u65f6\uff0c\u4f1a\u6d3e\u751f\u51fa\u591a\u4e2a\u5b50\u7ebf\u7a0b\u6765\u6267\u884c\u8be5\u4ee3\u7801\u5757(\u5305\u542b\u539f\u6765\u7684\u6240\u8c13\u4e3b\u7ebf\u7a0b)\uff0c\u5728\u6267\u884c\u5b8c\u8be5\u7a0b\u5e8f\u5757\u540e\u518d\u901a\u8fc7barrier\u540c\u6b65\u3001<em>Join<\/em>\u5230\u4e3b\u7ebf\u7a0b\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#include &lt;stdio.h&gt;\n\nint main(int argc, char **argv)\n{\n\n#pragma omp parallel\n    for (int i = 0; i &lt; 5; i++) {\n        printf(\"hello world i=%d\\n\", i);\n    }\n\n\n    return 0;\n}\n\n<\/code><\/pre>\n\n\n\n<p>\u7a0b\u5e8f\u5728\u6267\u884c\u5230<code>#pragma omp parallel<\/code>\u65f6\uff0c\u603b\u5171\u4f1a\u6709\u591a\u5c11\u4e2a\u5b50\u7ebf\u7a0b\u6765\u6267\u884c\u8fd9\u4e2a\u4ee3\u7801\u5757\u5462\uff1fOpenMP\u6309\u7167\u4ee5\u4e0b\u987a\u5e8f\u51b3\u5b9a\u7ebf\u7a0b\u7684\u4e2a\u6570\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u7cfb\u7edf\u7f3a\u7701\u503c\uff1b<\/li><li>\u73af\u5883\u53d8\u91cf<code>OMP_NUM_THREADS<\/code>\uff1b<\/li><li>\u7a0b\u5e8f\u4e2d\u4f7f\u7528OpenMP\u7684API\u8bbe\u7f6e\uff1b<\/li><\/ol>\n\n\n\n<p>\u4e0a\u9762\u7a0b\u5e8f\u5728\u8bbe\u7f6e<code>OMP_NUM_THREADS<\/code>\u4e3a2\u65f6\uff0c\u5176\u8f93\u51fa\u4e3a\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>hello world i=0 hello world i=1 hello world i=2 hello world i=3 hello world i=4 hello world i=0 hello world i=1 hello world i=2 hello world i=3 hello world i=4<\/p><\/blockquote>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0cOpenMP\u662f\u4ee5\u590d\u5236\u5230<code>OMP_NUM_THREADS<\/code>\u4e2a\u7ebf\u7a0b\u7684\u65b9\u5f0f\u6765\u6267\u884c\u8ddf\u5728<code>#pragma omp parallel<\/code>\u540e\u9762\u7684\u4ee3\u7801\u5757\u3002<\/p>\n\n\n\n<p>\u800c\u5bf9\u4e8e\u4e0b\u9762\u7684\u5faa\u73af\u5e76\u884c\u5316\u4ee3\u7801\uff0cOpenMP\u5219\u662f\u7528\u4efb\u52a1\u5206\u914d\u7684\u65b9\u5f0f\u6267\u884c\u7684\uff0c\u5c06\u5faa\u73af\u6240\u9700\u8981\u7684\u6240\u6709\u5de5\u4f5c\u91cf\u6309\u7167\u4e00\u5b9a\u7684\u65b9\u5f0f\u5206\u914d\u5230\u5404\u4e2a\u6267\u884c\u7ebf\u7a0b\u4e2d\uff0c\u6240\u6709\u7ebf\u7a0b\u6267\u884c\u5de5\u4f5c\u7684\u603b\u548c\u662f\u539f\u5148\u4e32\u884c\u6267\u884c\u6240\u5b8c\u6210\u7684\u5de5\u4f5c\u91cf\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#include &lt;stdio.h&gt;\n\nint main(int argc, char **argv)\n{\n\n#pragma omp parallel for\n    for (int i = 0; i &lt; 5; i++) {\n        printf(\"hello world i=%d\\n\", i);\n    }\n\n\n    return 0;\n}\n\n\n<\/code><\/pre>\n\n\n\n<p>\u5176\u8f93\u51fa\u4e3a\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>hello world i=0 hello world i=1 hello world i=2 hello world i=3 hello world i=4<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2%E6%8E%A7%E5%88%B6%E5%8F%98%E9%87%8F%E5%9C%A8%E7%BA%BF%E7%A8%8B%E9%97%B4%E7%9A%84%E5%85%B1%E4%BA%AB%E5%B1%9E%E6%80%A7\"><span class=\"ez-toc-section\" id=\"2%E6%8E%A7%E5%88%B6%E5%8F%98%E9%87%8F%E5%9C%A8%E7%BA%BF%E7%A8%8B%E9%97%B4%E7%9A%84%E5%85%B1%E4%BA%AB%E5%B1%9E%E6%80%A7\"><\/span>2.\u63a7\u5236\u53d8\u91cf\u5728\u7ebf\u7a0b\u95f4\u7684\u5171\u4eab\u5c5e\u6027<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#include &lt;stdio.h&gt;\n\nint counter = 100;\n\n#pragma omp threadprivate(counter)\n\nvoid inc_counter()\n{\n    counter++;\n}\n\nint main(int argc, char **argv)\n{\n    #pragma omp parallel\n    {\n        for (int i = 0; i &lt; 10000; i++)\n            inc_counter();\n        printf(\"counter=%d\\n\", counter);\n    }\n\n    return 0;\n}\n\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u901a\u8fc7<strong>threadprivate<\/strong>\u5b50\u53e5\u58f0\u660e\u5168\u5c40\u53d8\u91cf<em>counter<\/em>\u662f\u7ebf\u7a0b\u79c1\u6709\u6570\u636e\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u7684\u8fc7\u7a0b\u4e2d\u4e0d\u80fd\u591f\u88ab\u5176\u4ed6\u7ebf\u7a0b\u8bbf\u95ee\u5230(\u548cThreadLocal\u7c7b\u4f3c)\u3002\u4e0a\u9762\u4ee3\u7801\u7684\u8f93\u51fa\u4e3a\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>counter=10100 counter=10100<\/p><\/blockquote>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u521d\u59cb\u5316<em>counter<\/em>\u53d8\u91cf\u662f\u5728main\u51fd\u6570\u4e4b\u524d\u521d\u59cb\u5316\u7684\uff0c\u6240\u4ee5OpenMP\u6d3e\u751f\u7684\u5b50\u7ebf\u7a0b\u7684\u79c1\u6709<em>counter<\/em>\u53d8\u91cf\u4e5f\u88ab\u521d\u59cb\u5316\u4e3a\u76f8\u5e94\u7684\u503c\uff0c\u4f46\u662f\u5982\u679c\u662f\u5728main\u51fd\u6570\u5185\u90e8\u8fdb\u884c\u521d\u59cb\u5316\uff0c\u90a3\u4e48\u5c31\u9700\u8981<em>copyin<\/em>\u6307\u4ee4\u6765\u663e\u793a\u5c06\u4e3b\u7ebf\u7a0b\u8be5\u53d8\u91cf\u7684\u503c\u62f7\u8d1d\u5230\u5176\u4ed6\u7ebf\u7a0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#include &lt;stdio.h&gt;\n#include &lt;omp.h&gt;\n\nint global = 0;\n\n#pragma omp threadprivate(global)\n\nint main(int argc, char **argv)\n{\n    global = 1000;\n    \n    #pragma omp parallel copyin(global)\n    {\n        printf(\"global=%d\\n\", global);\n        global = omp_get_thread_num();\n    }\n\n    printf(\"global=%d\\n\", global);\n    printf(\"parallel again\\n\");\n\n    #pragma omp parallel\n    printf(\"global=%d\\n\", global);\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>\u53ef\u4ee5\u770b\u51fa\uff0c\u901a\u8fc7copyin\u7684\u64cd\u4f5c\uff0c\u786e\u5b9e\u5c06\u7ebf\u7a0b\u7684\u79c1\u6709\u5316\u53d8\u91cf\u521d\u59cb\u5316\u4e3a\u4e3b\u7ebf\u7a0b\u4e2d\u76f8\u5e94\u7684\u5168\u5c40\u53d8\u91cf\u7684\u503c\u3002\u5728\u5e76\u884c\u533a\u57df\u6267\u884c\u5b8c\u6bd5\u9000\u51fa\u540e\uff0c\u4e3b\u7ebf\u7a0b\u4e0e\u5b50\u7ebf\u7a0b\u4e2d\u7684\u76f8\u5e94\u7684\u5168\u5c40\u53d8\u91cf\u7ee7\u7eed\u6709\u6548\uff0c\u5e76\u4e14\u5728\u518d\u4e00\u6b21\u8fdb\u5165\u5e76\u884c\u533a\u57df\u65f6\uff0c\u4f7f\u7528\u4e0a\u4e00\u6b21\u9000\u51fa\u65f6\u6240\u8d4b\u7684\u503c\u3002<\/p><\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3%E5%B7%A5%E4%BD%9C%E5%88%86%E5%8C%BA%E7%BC%96%E7%A0%81sections\"><span class=\"ez-toc-section\" id=\"3%E5%B7%A5%E4%BD%9C%E5%88%86%E5%8C%BA%E7%BC%96%E7%A0%81sections\"><\/span>3.\u5de5\u4f5c\u5206\u533a\u7f16\u7801sections<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#include &lt;stdio.h&gt;\n#include &lt;omp.h&gt;\n\nint main(int argc, char **argv)\n{\n    #pragma omp parallel sections\n    {\n        #pragma omp section\n            printf(\"section 1 thread=%d\\n\", omp_get_thread_num());\n        #pragma omp section\n            printf(\"section 2 thread=%d\\n\", omp_get_thread_num());\n        #pragma omp section\n            printf(\"section 3 thread=%d\\n\", omp_get_thread_num());\n    }\n\n    return 0;\n}\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c<em>section<\/em>\u6807\u6ce8\u7684\u51e0\u6bb5\u4ee3\u7801\u5206\u522b\u5728\u4e0d\u540c\u7684\u7ebf\u7a0b\u4e2d\u5e76\u884c\u6267\u884c\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4%E7%BA%BF%E7%A8%8B%E5%90%8C%E6%AD%A5\"><span class=\"ez-toc-section\" id=\"4%E7%BA%BF%E7%A8%8B%E5%90%8C%E6%AD%A5\"><\/span>4.\u7ebf\u7a0b\u540c\u6b65<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>OpenMP\u4e2d\uff0c\u63d0\u4f9b\u4e863\u79cd\u4e0d\u540c\u7684\u4e92\u65a5\u9501\u673a\u5236\u7528\u6765\u5bf9\u4e00\u5757\u5185\u5b58\u8fdb\u884c\u4fdd\u62a4\uff0c\u5206\u522b\u662f\u4e34\u754c\u533a\u3001\u539f\u5b50\u64cd\u4f5c\u548c\u5e93\u51fd\u6570\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u4e34\u754c\u533a<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#pragma omp critical [(name)]\nblock\n<\/code><\/pre>\n\n\n\n<p>\u4f7f\u7528\u4e34\u754c\u533a\u7684\u683c\u5f0f\u5982\u4e0a\uff0c\u53ef\u4ee5\u4e3a\u4e0d\u540c\u7684\u4e34\u754c\u533a\u53d6\u4e0d\u540c\u7684\u540d\u5b57\uff0c\u8fd9\u6837\u53ea\u6709\u591a\u4e2a\u7ebf\u7a0b\u5728\u8bbf\u95ee\u540c\u4e00\u4e2a\u4e34\u754c\u533a\u65f6\u624d\u4f1a\u4ea7\u751f\u4e92\u65a5\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\"><li>\u539f\u5b50\u64cd\u4f5c<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">#pragma omp atomic\nx &lt;binop&gt;= expr\n\u6216\u8005\uff1a\n#pragma omp atomic\nx++\/x--\/++x\/--x;\n<\/code><\/pre>\n\n\n\n<p>\u539f\u5b50\u64cd\u4f5c\u53ea\u80fd\u5bf9builtin\u7684\u57fa\u672c\u6570\u636e\u7c7b\u578b\u6709\u6548(\u8fd9\u6837\u624d\u53ef\u4ee5\u8f6c\u5316\u6210\u4e00\u6761\u76f8\u5e94\u7684\u673a\u5668\u6307\u4ee4)\uff0c\u53ef\u4ee5\u5b9e\u73b0\u539f\u5b50\u64cd\u4f5c\u7684\u8fd0\u7b97\u6709\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">+ * - \/ &amp; ^ | &lt;&lt; &gt;&gt;\n<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u503c\u5f97\u6ce8\u610f\u7684\u4e00\u70b9\u662f<strong>\u5f53\u5bf9\u4e00\u4e2a\u6570\u636e\u8fdb\u884c\u539f\u5b50\u64cd\u4f5c\u4fdd\u62a4\u7684\u65f6\u5019\uff0c\u5c31\u4e0d\u80fd\u5bf9\u6570\u636e\u8fdb\u884c\u4e34\u754c\u533a\u7684\u4fdd\u62a4<\/strong>\uff0c\u8fd9\u662f\u4e24\u79cd\u4e0d\u540c\u7684\u4fdd\u62a4\u673a\u5236\uff0cOpenMP\u8fd0\u884c\u65f6\u5e76\u4e0d\u80fd\u5728\u8fd9\u4e24\u79cd\u4fdd\u62a4\u673a\u5236\u4e4b\u95f4\u5efa\u7acb\u914d\u5408\u673a\u5236\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u516b\u3001OpenMP\u591a\u7ebf\u7a0b\u7f16\u7a0b\u53ca\u6027\u80fd\u4f18\u5316 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