{"id":845,"date":"2013-04-05T11:01:20","date_gmt":"2013-04-05T09:01:20","guid":{"rendered":"http:\/\/oldblogs.uct.ac.za\/blog\/big-bytes\/2013\/04\/05\/playing-fair"},"modified":"2015-08-14T11:45:44","modified_gmt":"2015-08-14T09:45:44","slug":"playing-fair","status":"publish","type":"post","link":"https:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/","title":{"rendered":"Playing fair"},"content":{"rendered":"<div>In anticipation of more users being added to the Hex cluster we have modified the scheduling rules. \u00a0Previously there was an open policy:<\/div>\r\n<div><span style=\"font-size: xx-small; color: #333333;\">\u00a0USERCFG[DEFAULT] MAXJOB=180<\/span><\/div>\r\n<div><span style=\"font-size: xx-small; color: #333333;\">\u00a0USERCFG[DEFAULT] MAXPROC=180<\/span><\/div>\r\n<div><span style=\"font-size: xx-small; color: #333333;\">\u00a0USERCFG[DEFAULT] MAXNODE=180<\/span><\/div>\r\n<div>This effectively allowed users to consume 66% of the cluster at a time. \u00a0We have now implemented the following hard and soft limits<\/div>\r\n<div><span style=\"font-size: xx-small; color: #333333;\">\u00a0USERCFG[DEFAULT] MAXPROC=64,180<\/span><\/div>\r\n<div>We've removed the\u00a0<span style=\"font-size: x-small; color: #333333;\">MAXJOB <\/span>and the\u00a0<span style=\"font-size: x-small; color: #333333;\">MAXNODE\u00a0<\/span>directives as we're only interested in restricting access to cores. The implication of <span style=\"font-size: xx-small; color: #333333;\">MAXPROC=60,180<\/span> is that in a heavily used state users will be limited to 60 cores each maximum, i.e. 25% of the cluster, but if the cluster is not heavily utilized the hard limit will be used granting 75% of the cluster to a single user. \u00a0(See\u00a0<a href=\"http:\/\/docs.adaptivecomputing.com\/maui\/6.2throttlingpolicies.php\">Adaptive Computing's throttling policies<\/a>\u00a0for more info)<\/div>\r\n<div><\/div>\r\n<div><\/div>","protected":false},"excerpt":{"rendered":"<div>In anticipation of more users being added to the Hex cluster we have modified the scheduling rules. &nbsp;Previously there was an open policy:<\/div>\n<div><span>&nbsp;USERCFG[DEFAULT] MAXJOB=180<\/span><\/div>\n<div><span>&nbsp;USERCFG[DEFAULT] MAXPROC=180<\/span><\/div>\n<div><span>&nbsp;USERCFG[DEFAULT] MAXNODE=180<\/span><\/div>\n<div>This effectively allowed users to consume 66% of the cluster at a time. &nbsp;We have now implemented the following hard and soft limits<\/div>\n<div><span>&nbsp;USERCFG[DEFAULT] MAXPROC=64,180<\/span><\/div>\n<div>We&#8217;ve removed the&nbsp;<span>MAXJOB <\/span>and the&nbsp;<span>MAXNODE&nbsp;<\/span>directives as we&#8217;re only interested in restricting access to cores. The implication of <span>MAXPROC=60,180<\/span> is that in a heavily used state users will be limited to 60 cores each maximum, i.e. 25% of the cluster, but if the cluster is not heavily utilized the hard limit will be used granting 75% of the cluster to a single user. &nbsp;(See&nbsp;<a href=\"http:\/\/docs.adaptivecomputing.com\/maui\/6.2throttlingpolicies.php\">Adaptive Computing&#8217;s throttling policies<\/a>&nbsp;for more info)<\/div>\n<div><\/div>\n<div><\/div>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Playing fair - UCT HPC<\/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:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Playing fair - UCT HPC\" \/>\n<meta property=\"og:description\" content=\"In anticipation of more users being added to the Hex cluster we have modified the scheduling rules. &nbsp;Previously there was an open policy:&nbsp;USERCFG[DEFAULT] MAXJOB=180&nbsp;USERCFG[DEFAULT] MAXPROC=180&nbsp;USERCFG[DEFAULT] MAXNODE=180This effectively allowed users to consume 66% of the cluster at a time. &nbsp;We have now implemented the following hard and soft limits&nbsp;USERCFG[DEFAULT] MAXPROC=64,180We&#039;ve removed the&nbsp;MAXJOB and the&nbsp;MAXNODE&nbsp;directives as we&#039;re only interested in restricting access to cores. The implication of MAXPROC=60,180 is that in a heavily used state users will be limited to 60 cores each maximum, i.e. 25% of the cluster, but if the cluster is not heavily utilized the hard limit will be used granting 75% of the cluster to a single user. &nbsp;(See&nbsp;Adaptive Computing&#039;s throttling policies&nbsp;for more info)\" \/>\n<meta property=\"og:url\" content=\"https:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/\" \/>\n<meta property=\"og:site_name\" content=\"UCT HPC\" \/>\n<meta property=\"article:published_time\" content=\"2013-04-05T09:01:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-08-14T09:45:44+00:00\" \/>\n<meta name=\"author\" content=\"Andrew Lewis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Andrew Lewis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/\"},\"author\":{\"name\":\"Andrew Lewis\",\"@id\":\"https:\/\/ucthpc.uct.ac.za\/#\/schema\/person\/c183ad1c0a1063124a72d63963ae9c7e\"},\"headline\":\"Playing fair\",\"datePublished\":\"2013-04-05T09:01:20+00:00\",\"dateModified\":\"2015-08-14T09:45:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/\"},\"wordCount\":130,\"publisher\":{\"@id\":\"https:\/\/ucthpc.uct.ac.za\/#organization\"},\"articleSection\":[\"hpc\"],\"inLanguage\":\"en-ZA\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/\",\"url\":\"https:\/\/ucthpc.uct.ac.za\/index.php\/2013\/04\/05\/playing-fair\/\",\"name\":\"Playing fair - 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