{"id":7980,"date":"2026-07-19T17:19:46","date_gmt":"2026-07-19T14:19:46","guid":{"rendered":"https:\/\/mummila.net\/kommentit\/?p=7980"},"modified":"2026-07-19T17:19:46","modified_gmt":"2026-07-19T14:19:46","slug":"testing-if-ferretdbs-cpu-usage-begins-to-climb-even-without-the-imported-board","status":"publish","type":"post","link":"https:\/\/mummila.net\/kommentit\/2026\/07\/19\/testing-if-ferretdbs-cpu-usage-begins-to-climb-even-without-the-imported-board\/","title":{"rendered":"Testing if ferretdb&#8217;s CPU usage begins to climb even without the imported board"},"content":{"rendered":"<p>I&#8217;ve reverted my live server back to 6.09 (and locked it there) for now.<\/p>\n<p>On the testing VM I started from scratch: I deleted all existing data and reinstalled the 10.02 snap. Right after installing it&#8217;s working fairly normally, no noticeable slowdown, and ferretdb is down in double- or even single digits of CPU percentage.<\/p>\n<p>I then exported my main working board from the live system (as JSON, 11 MB) and imported it into the VM installation. There was some noticeable slowdown right after, but eventually it settled back into working normally (i.e. no tangible slowdown).<\/p>\n<p>But ferretdb&#8217;s CPU usage began to climb, until it was again using more than 160 % of the CPU.<\/p>\n<p>Since then, I&#8217;ve tried to isolate the triggering cause from the import (if any), but no luck so far.<\/p>\n<p>The only possibly relevant messages I&#8217;ve seen in the log during this were:<\/p>\n<pre><code>MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 drain listeners added to [Gzip]. MaxListeners is 10. Use emitter.setMaxListeners() to increase limit\r\nMaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 error listeners added to [ServerResponse]. MaxListeners is 10. Use emitter.setMaxListeners() to increase limit<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>I deleted all existing data and reinstalled the 10.02 snap. After importing one board, ferretdb&#8217;s CPU usage began to climb again.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8860],"tags":[14051,14042],"class_list":["post-7980","post","type-post","status-publish","format-standard","hentry","category-vianhallintajarjestelmat","tag-snap","tag-wekan","sijainti-github"],"_links":{"self":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts\/7980","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/comments?post=7980"}],"version-history":[{"count":7,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts\/7980\/revisions"}],"predecessor-version":[{"id":7987,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/posts\/7980\/revisions\/7987"}],"wp:attachment":[{"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/media?parent=7980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/categories?post=7980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mummila.net\/kommentit\/wp-json\/wp\/v2\/tags?post=7980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}