High CPU and restarts after upgrade to OH4

[KenkiCK]

I can see that the CPU load is also very high. I use a raspberry 4 with 4 GB. Memory usage is fine for me but CPU load of one is by 100%.

There are a lot of processes with the same parameters / modules

I’m not sure if the memory settings of these processes are correct or can be changed and if it helps.

To establishing a connection to the Raspberry needs much more longe like before but OH4 itself works for me fine.

[helmar74 (Helmar)]

Try restarting OH again. That worked for me. After first restart one Core at 100%, after second restart and ~4hours:

[KenkiCK]

OH restarts every day. That doesn’t help. Also cache was deleted but never changed anything. I’m not sure about the 100 processes. I have 177 Things and over 600 Items. It could be that every thing has an own process but not sure.

[helmar74 (Helmar)]

Are you running out of Memory?

MAybe you have a look here:

openHAB 4 migration FAQ

Seeing many issues related to openHAB 4.0 migration, sometimes duplicated, I thought maybe it might help to create an overview of the different issues and their current status. Therefore I have compiled this initial FAQ based on observations. Index Upgrade failing due to Java upgrade TransformationService of type ‘JS’ is unavailable ScriptEngine for language ‘application/javascript’ not found Blocky rules not working: PolyglotException: ReferenceError High CPU usage Channel types or config des…

Very High Memory Usage and frequent restarts with OH4

Since I upgraded from 3.4.4 to 4.0, I have noticed that everything is very s l o w. Memory usage is high, though processor usage appears low: [image] And openHAB restarts on its own frequently. I get an email from iCloud every time the binding reconnects after a restart, and I have received 76 since I upgraded the evening of July 23. (I have no reason to think the iCloud binding is causing the problem, I only mention it because the email from iCloud is an easy way to track it). There is no…

Maybe you should increase in /etc/default/openhab:

EXTRA_JAVA_OPTS=“-Xms900m -Xmx2000m”

Of course depending on your hardware…

[KenkiCK]

Many thanks, today morning the CPU usage is normal. I will check it today every hour to figure out what the reason can be. I guess that something loops.

[mstormi (Markus Storm)]

Mind my post on the main thread please. This is why I moved yours to a separate thread.

[KenkiCK]

Now an update : it’s really not easy to figure out. Today the CPU Load is by 100 % for one CPU. After restart the service it works normal. To figure out I add an item for the CPU load and add it for the persistence group too. I’m not sure if it works and how but I hope that this allows to check the logs in the time after CPU load increase.

One problem what I have : there are a lot of Java processes but no ID to the whatever … item, rules, trigger, … for further version of OH it would help if there is a id which allow a conclusion for whta it is.

[Udo_Hartmann]

@KenkiCK

One problem what I have : there are a lot of Java processes but no ID to the whatever … item, rules, trigger, … for further version of OH it would help if there is a id which allow a conclusion for whta it is.

Yes. but that’s out of scope of openHAB, these are all child processes of the main java command, maybe a specialized java tool would help

[supersjel (Michel)]

Assuming you’re on a local network and you have a Windows laptop you can try to add visualvm (included in jdk downloads) to the openhab Java process. That shows more detailed information.

[Ruben_Perez]

Same here… high CPU usage after upgrading from 3.4.4 to 4.0.1

[Wolfgang_S]

@Ruben_Perez

Same here… high CPU usage after upgrading from 3.4.4 to 4.0.1

I have a question about this. Is this a migrated installation from Buster to Bullseye ?
In case it is was that a 32 bit Buster installation ?
In case it was what is the output of command: uname -a after this migration ?

[KenkiCK]

Yes, I have migrated to Bullseye because otherwise I’m not able to install Java 17.

uname -u

Actual it works for me. I figure out that I have a binding thats not compatible to OH 4 (in this case it was installed manually by myself). After I removed it the high CPU load was gone.

Very important is to clear the cache.

[Ruben_Perez]

In my case is an upgrade, I am using a mini PC with Windows 10.

I have shutdown OH 3.4.4, installed Zulu Java 17, uninstalled Java 11 and perform a update of OH using command line bat (as I have done all.other times and upgrades).

Ruben
Edited: cache and temp folders cleared after first reboot, because I have problems after that (not before reboot). From then all is working correctly except for the high CPU usage. I have changed the 3 transformations that I use from JS to DSL inline, so don’t have to use JS binding.

[Ruben_Perez]

Last update: After 36 hours and without any new intervention, CPU usage has been lowered to levels only a bit more than before 4.0.1. I don’t know what happened.

Also memory has increassed only a little more than before.

[Ruben_Perez]

This version is killing me… after a system reboot I have this issue:
Bug since OH4: Why are the default.sitemap and *.things files not loaded on startup? (empty sitemap list) - Setup, Configuration and Use / Runtime - openHAB Community
Solved cleaning cache and tmp folder and restarting OpenHAB… now, CPU usage is at 100%.

Ruben

[Andrew_Rowe]

Have you seen this thread? There is a work around being tested, that link is the post with instructions to install patch. Report your issue in that thread or on git hub issue

[Ruben_Perez]

Thanks very much, i haven’t read it. I will read and try, and report results.

Ruben

[Ruben_Perez]

Thanks so much I have tested and I reporting on the thread, it seems that is solved… I need a little more time to see that the results are consistents, but looks ok!