Java Very High CPU on Unifi Controller Ubuntu 20

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Java Very High CPU on Unifi Controller Ubuntu 20 #641668 12/01/21 06:45 PM
Joined: Aug 2004 Posts: 1,511 Likes: 15 Calgary, AB, Canada Toner OP Admin
OP Toner Admin Joined: Aug 2004 Posts: 1,511 Likes: 15 Calgary, AB, Canada	We had a long, drawn out support ticket with Unifi about this. In the end they said this incredibly high CPU usage was expected behaviour Much of the saga is chronicled here: https://community.ui.com/questions/...CPU/ca8d4f20-ec87-4c38-aa04-33ac05f1fb2f It turned out our workaround of /usr/bin/cpulimit -b -l 50 -e /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java caused a few other issues such as occasional controller lockups and lack of client stats when viewing a site. (black screen when trying to view client device list) This morning we upgraded the controller software to 6.5.53 and happened to notice an option to turn off "Analytics & Improvements" under Network Application>Console Settings. The Unifi upgrade didn't make much of a change even after we gave the CPU a chance to settle down. However, within minutes of turning off "Analytics & Improvements" our CPU usage on the AWS t3a.xlarge instance went from around 45% to 2.5% and has been there for a half hour! We may be jumping the gun but this option appears to be the single source of all the nasty Java CPU usage. Looking for a VoIP Phone Canada provider? Put Atcom's valuable VoIP expertise to work for your business today!

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Re: Java Very High CPU on Unifi Controller Ubuntu 20 Toner #641675 12/02/21 04:57 PM
Joined: Dec 2007 Posts: 6,766 Likes: 11 Canby, Oregon Professor Shadow Retired Admin
Professor Shadow Retired Admin Joined: Dec 2007 Posts: 6,766 Likes: 11 Canby, Oregon	"...they said this incredibly high CPU usage was expected behaviour." If that is the case, then it is definitely an Engineering Oversight. No excuse for resources to be tied up! Dean Photographs: https://www.instagram.com/deanwilsoncanby/ https://fstoppers.com/profile/deanwilsoncanby https://www.facebook.com/Dean-Wilson-Photography-112841337020414 Please don't confuse your "Internet Search" with my licenses, certifications and over 30 years experience. "Thank you for calling Technical Support. If you feel you have reached this number in error, please hang up and press redial."

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