{"id":13876,"date":"2022-10-05T17:02:02","date_gmt":"2022-10-05T11:32:02","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-vector-addition-in-cuda-using-streams\/"},"modified":"2022-10-05T17:02:02","modified_gmt":"2022-10-05T11:32:02","slug":"solved-vector-addition-in-cuda-using-streams","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-vector-addition-in-cuda-using-streams\/","title":{"rendered":"[Solved] vector addition in CUDA using streams"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-22121546\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"22121546\" data-parentid=\"22121443\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>One problem is how you are handling <code>h_A<\/code>, <code>h_B<\/code>, and <code>h_C<\/code>:<\/p>\n<pre><code>h_A = (float *) wbImport(wbArg_getInputFile(args, 0), &amp;inputLength);\nh_B = (float *) wbImport(wbArg_getInputFile(args, 1), &amp;inputLength);\n<\/code><\/pre>\n<p>The above lines of code are creating an allocation for <code>h_A<\/code> and <code>h_B<\/code> and importing some data (presumably).<\/p>\n<p>These lines of code:<\/p>\n<pre><code>cudaHostAlloc((void **) &amp;h_A, size, cudaHostAllocDefault);\ncudaHostAlloc((void **) &amp;h_B, size, cudaHostAllocDefault);\ncudaHostAlloc((void **) &amp;h_C, size, cudaHostAllocDefault);\n<\/code><\/pre>\n<p>Are not doing what you think.  They are creating a <em>new<\/em> allocation for <code>h_A<\/code>, <code>h_B<\/code> and <code>h_C<\/code>. Whatever data those pointers previously referenced is no longer accessible from those pointers (i.e. for all intents and purposes, it is lost).<\/p>\n<p>CUDA should be able to work just fine with the pointers and allocations being created here:<\/p>\n<pre><code>h_A = (float *) wbImport(wbArg_getInputFile(args, 0), &amp;inputLength);\nh_B = (float *) wbImport(wbArg_getInputFile(args, 1), &amp;inputLength);\nh_C = (float *) malloc(inputLength * sizeof(float));\n<\/code><\/pre>\n<p>So delete these lines of code:<\/p>\n<pre><code>cudaHostAlloc((void **) &amp;h_A, size, cudaHostAllocDefault);\ncudaHostAlloc((void **) &amp;h_B, size, cudaHostAllocDefault);\ncudaHostAlloc((void **) &amp;h_C, size, cudaHostAllocDefault);\n<\/code><\/pre>\n<p>and delete these:<\/p>\n<pre><code>cudaFreeHost(h_A);\ncudaFreeHost(h_B);\ncudaFreeHost(h_C);\n<\/code><\/pre>\n<p>And you should be closer to a solution.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved vector addition in CUDA using streams <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] One problem is how you are handling h_A, h_B, and h_C: h_A = (float *) wbImport(wbArg_getInputFile(args, 0), &amp;inputLength); h_B = (float *) wbImport(wbArg_getInputFile(args, 1), &amp;inputLength); The above lines of code are creating an allocation for h_A and h_B and importing some data (presumably). These lines of code: cudaHostAlloc((void **) &amp;h_A, size, cudaHostAllocDefault); cudaHostAlloc((void **) &#8230; <a title=\"[Solved] vector addition in CUDA using streams\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-vector-addition-in-cuda-using-streams\/\" aria-label=\"More on [Solved] vector addition in CUDA using streams\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1564,1163,806],"class_list":["post-13876","post","type-post","status-publish","format-standard","hentry","category-solved","tag-cuda","tag-parallel-processing","tag-vector"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] vector addition in CUDA using streams - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-vector-addition-in-cuda-using-streams\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] vector addition in CUDA using streams - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] One problem is how you are handling h_A, h_B, and h_C: h_A = (float *) wbImport(wbArg_getInputFile(args, 0), &amp;inputLength); h_B = (float *) wbImport(wbArg_getInputFile(args, 1), &amp;inputLength); The above lines of code are creating an allocation for h_A and h_B and importing some data (presumably). 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