{"id":372,"date":"2016-07-29T16:17:13","date_gmt":"2016-07-29T16:17:13","guid":{"rendered":"http:\/\/pi2e.ch\/blog\/?p=372"},"modified":"2016-10-05T15:15:28","modified_gmt":"2016-10-05T15:15:28","slug":"3-2-1-go","status":"publish","type":"post","link":"https:\/\/pi2e.ch\/blog\/2016\/07\/29\/3-2-1-go\/","title":{"rendered":"3, 2, 1, Go!"},"content":{"rendered":"<p>Yesterday afternoon two colleagues kindly helped me to mount the <a href=\"https:\/\/pi2e.ch\/blog\/2016\/07\/05\/the-pi-storage\/\">\u03c0-Storage<\/a> in a rack in our server room and to connect it to our fastest server, a DELL R930 with 144 logical cores. This morning I mounted all discs as separate mount points into my project directory \/pi. After downloading the latest version of y-cruncher (Version\u00a0<strong><a href=\"http:\/\/www.numberworld.org\/y-cruncher\/y-cruncher%20v0.7.1.9465-static.tar.gz\">0.7.1 Build 9465<\/a><\/strong>) I collect all the required command line parameters to compute 22 459 157 718 361 decimal digits of\u00a0\u03c0 . The final command is:<\/p>\n<blockquote><p>.\/y-cruncher custom pi -dec:22459157718361 -C:200b -algorithm:0 -o \/pi\/result -mode:swap -minIO:256m -swap:raid0 \/pi\/data1 \/pi\/data2 \/pi\/data3 \/pi\/data4 \/pi\/data5 \/pi\/data6 \/pi\/data7 \/pi\/data8 \/pi\/data9 \/pi\/data10 \/pi\/data11 \/pi\/data12 \/pi\/data13 \/pi\/data14 \/pi\/data15 \/pi\/data16 \/pi\/data17 \/pi\/data18 \/pi\/data19 \/pi\/data20 &gt; pi.log &amp;<\/p><\/blockquote>\n<p>After being interrupted by some meetings, in the afternoon everything is ready to start the computation. 3, 2, 1, let&#8217;s go! The official start time is: Fri Jul 29 15:06:20 2016<b>. <\/b><\/p>\n<p>August, 2nd: Since I was not in the office yesterday (August 1st is the Swiss National Day), today I get the first estimate on how long the computation will take. From my control screen I get the following information:<\/p>\n<p><a href=\"https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-374 size-large\" src=\"https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start-1024x560.png\" alt=\"start\" width=\"700\" height=\"383\" srcset=\"https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start-1024x560.png 1024w, https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start-300x164.png 300w, https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start-768x420.png 768w, https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start-1140x623.png 1140w, https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start-552x302.png 552w, https:\/\/pi2e.ch\/blog\/wp-content\/uploads\/2016\/08\/start.png 1861w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n<p>On the top left you see the log file of y-cruncher. After three and a half days, already 11% of the series summing are finished. From previous computations I know that the summing makes up about two third of the total time. Including some time for backups and disc replacements, the computation might be finished in about 2-3 months. That&#8217;s not too bad, the last records took 94 and 208 days. On the top right, I monitor the disk usage to find good moments for a fast backup. So far, only 200 GBs on each disc are used. On the bottom left you see the disc-IO, which currently shows no activity. The intervals with purely CPU work being done are longer than what I&#8217;ve expected. So it was not a bad decision to use our fastest server. On the bottom right I monitor the CPU usage, which at the time of the screenshot was close to its maximum of 14400 per cent.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p class=\"post-excerpt\">Yesterday afternoon two colleagues kindly helped me to mount the \u03c0-Storage in a rack in our server room and to&#8230;<\/p>\n","protected":false},"author":1,"featured_media":398,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4],"class_list":["post-372","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-world-record"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>3, 2, 1, Go! - 22.4 trillion digits of pi<\/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:\/\/pi2e.ch\/blog\/2016\/07\/29\/3-2-1-go\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"3, 2, 1, Go! 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