{"id":24991,"date":"2024-03-16T04:11:17","date_gmt":"2024-03-16T04:11:17","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/"},"modified":"2024-03-22T05:05:33","modified_gmt":"2024-03-22T05:05:33","slug":"how-to-write-parallel-computing-in-c-programming-language","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/","title":{"rendered":"How to write parallel computing in C programming language"},"content":{"rendered":"<p>In C programming language, parallel computing can be achieved using multithreading. Below is a simple example code demonstrating how to perform parallel computing using multithreading.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;stdio.h&gt;<\/span><\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">include<\/span> <span class=\"hljs-string\">&lt;pthread.h&gt;<\/span><\/span>\r\n\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">define<\/span> THREADS_COUNT 4<\/span>\r\n<span class=\"hljs-meta\">#<span class=\"hljs-keyword\">define<\/span> ARRAY_SIZE 1000000<\/span>\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-built_in\">array<\/span>[ARRAY_SIZE];\r\n<span class=\"hljs-type\">int<\/span> sum = <span class=\"hljs-number\">0<\/span>;\r\n\r\n<span class=\"hljs-comment\">\/\/ \u7ebf\u7a0b\u51fd\u6570\uff0c\u7528\u4e8e\u8ba1\u7b97\u6570\u7ec4\u7684\u90e8\u5206\u548c<\/span>\r\n<span class=\"hljs-type\">void<\/span>* <span class=\"hljs-title function_\">calculateSum<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">void<\/span>* arg)<\/span> {\r\n    <span class=\"hljs-type\">int<\/span> thread_id = *(<span class=\"hljs-type\">int<\/span>*)arg;\r\n    <span class=\"hljs-type\">int<\/span> start = thread_id * (ARRAY_SIZE \/ THREADS_COUNT);\r\n    <span class=\"hljs-type\">int<\/span> end = start + (ARRAY_SIZE \/ THREADS_COUNT);\r\n\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = start; i &lt; end; i++) {\r\n        sum += <span class=\"hljs-built_in\">array<\/span>[i];\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">NULL<\/span>;\r\n}\r\n\r\n<span class=\"hljs-type\">int<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">()<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ \u521d\u59cb\u5316\u6570\u7ec4<\/span>\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; ARRAY_SIZE; i++) {\r\n        <span class=\"hljs-built_in\">array<\/span>[i] = i;\r\n    }\r\n\r\n    <span class=\"hljs-type\">pthread_t<\/span> threads[THREADS_COUNT];\r\n    <span class=\"hljs-type\">int<\/span> thread_ids[THREADS_COUNT];\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u521b\u5efa\u591a\u4e2a\u7ebf\u7a0b\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u8d1f\u8d23\u8ba1\u7b97\u6570\u7ec4\u7684\u4e00\u90e8\u5206<\/span>\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; THREADS_COUNT; i++) {\r\n        thread_ids[i] = i;\r\n        pthread_create(&amp;threads[i], <span class=\"hljs-literal\">NULL<\/span>, calculateSum, &amp;thread_ids[i]);\r\n    }\r\n\r\n    <span class=\"hljs-comment\">\/\/ \u7b49\u5f85\u6240\u6709\u7ebf\u7a0b\u6267\u884c\u5b8c\u6bd5<\/span>\r\n    <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-type\">int<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; THREADS_COUNT; i++) {\r\n        pthread_join(threads[i], <span class=\"hljs-literal\">NULL<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-built_in\">printf<\/span>(<span class=\"hljs-string\">\"Sum: %d\\n\"<\/span>, sum);\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-number\">0<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>In the above code, we define an integer array &#8216;array&#8217; containing one million elements. Then, we create four threads, with each thread calculating the sum of a portion of the array. Finally, we add up the calculated partial sums to get the final result and output it.<\/p>\n<p>In parallel computing, we use mutex locks to ensure thread safety by preventing multiple threads from simultaneously modifying the sum variable to avoid race conditions. In this simple example, using mutex locks is not necessary because each thread calculates a non-overlapping part, and they do not access the same memory location at the same time. However, in more complex parallel computing scenarios, mutex locks may be needed to ensure data consistency.<\/p>\n<p>Additionally, it is important to note that using multiple threads may not necessarily improve a program&#8217;s performance, as the overhead of switching and syncing between threads may outweigh the performance gains from parallel computing. Therefore, when using multiple threads for parallel computing, it is important to evaluate and optimize based on the specific application scenario.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In C programming language, parallel computing can be achieved using multithreading. Below is a simple example code demonstrating how to perform parallel computing using multithreading. #include &lt;stdio.h&gt; #include &lt;pthread.h&gt; #define THREADS_COUNT 4 #define ARRAY_SIZE 1000000 int array[ARRAY_SIZE]; int sum = 0; \/\/ \u7ebf\u7a0b\u51fd\u6570\uff0c\u7528\u4e8e\u8ba1\u7b97\u6570\u7ec4\u7684\u90e8\u5206\u548c void* calculateSum(void* arg) { int thread_id = *(int*)arg; int start = thread_id [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-24991","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to write parallel computing in C programming language - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to write parallel computing in C programming language\" \/>\n<meta property=\"og:description\" content=\"In C programming language, parallel computing can be achieved using multithreading. Below is a simple example code demonstrating how to perform parallel computing using multithreading. #include &lt;stdio.h&gt; #include &lt;pthread.h&gt; #define THREADS_COUNT 4 #define ARRAY_SIZE 1000000 int array[ARRAY_SIZE]; int sum = 0; \/\/ \u7ebf\u7a0b\u51fd\u6570\uff0c\u7528\u4e8e\u8ba1\u7b97\u6570\u7ec4\u7684\u90e8\u5206\u548c void* calculateSum(void* arg) { int thread_id = *(int*)arg; int start = thread_id [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T04:11:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T05:05:33+00:00\" \/>\n<meta name=\"author\" content=\"Sophia Anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sophia Anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/\"},\"author\":{\"name\":\"Sophia Anderson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/19a24313de9c988db3d69226b4a40a30\"},\"headline\":\"How to write parallel computing in C programming language\",\"datePublished\":\"2024-03-16T04:11:17+00:00\",\"dateModified\":\"2024-03-22T05:05:33+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/\"},\"wordCount\":208,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-write-parallel-computing-in-c-programming-language\/\",\"name\":\"How to write parallel computing in C programming language - 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