{"id":361329,"date":"2024-04-09T13:40:38","date_gmt":"2024-04-09T13:40:38","guid":{"rendered":"\/forum\/forums\/reply\/361329\/"},"modified":"2024-04-09T13:40:38","modified_gmt":"2024-04-09T13:40:38","slug":"361329","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/361329\/","title":{"rendered":"Reply To: Fluent UDF: An example using PRF_GRSUM macro?"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;The PRF_GRSUM macro in Fluent&#8217;s User Defined Functions (UDF) is used to compute the global sum of a float or double array across all compute nodes in a parallel computation. Here&#8217;s an example of how you might use the PRF_GRSUM macro in a UDF:&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;DEFINE_ON_DEMAND(test)&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;{&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;real x[1]; \/* Array of size 1 to hold the sum *\/&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;real sum;&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;int iwork[1]; \/* Work array for parallel operation *\/&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;\/* Initialize the array with the value to sum *\/&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;x[0] = 5; \/* Your code to set the initial value *\/&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;\/* Compute the global sum *\/&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;PRF_GRSUM(x, 1, iwork);&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;\/* x[0] now contains the sum of the values across all compute nodes *\/&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;sum = x[0];&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;Message0(&#8220;Total = %f\\n&#8221;,sum);&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;\/* You can now use &#8216;sum&#8217; for further calculations or monitoring *\/&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;margin-bottom: 0cm;&#8221;&gt;&lt;span style=&#8221;font-size: 10.0pt; line-height: 107%; font-family: &#8216;Courier New&#8217;;&#8221;&gt;}&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;In this example, <code>x<\/code> is an array that you want to sum across all compute nodes. The <code>PRF_GRSUM<\/code> macro takes the array <code>x<\/code>, the number of elements in the array (which is 1 in this case), and a work array <code>iwork<\/code> as arguments. After the macro is called, <code>x[0]<\/code> will contain the global sum of the values that were in <code>x<\/code> on each compute node.&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;Please note that the PRF_GRSUM macro should be used in a context where it is called only once per compute node, such as within the <code>DEFINE_ADJUST<\/code> macro, to avoid issues with parallel execution as mentioned in the documentation.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-361329","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi,The PRF_GRSUM macro in Fluent&#039;s User Defined Functions (UDF) is used to compute the global sum of a float or double array across all compute nodes in a parallel computation. 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