I’ve received some complaints from users who occasionally can’t post or create topics. This issue seems to occur randomly, but it may be related to high CPU usage on the server. Here’s a snapshot from htop showing the CPU usage during one of these spikes. [image] Each time the CPU usage spikes, I notice the following command running: postgres:13/main: discourse discouse [local] UPDATE This occurs every hour (more or less): [image] Additionally, we’re seeing an increase in logs around the same times, usually coinciding with high CPU usage. [image] Could this be a memory or CPU limitation on the server? If anyone has insights into diagnosing or resolving this, I would greatly appreciate your help. Thank you in advance!

We have identified the issue. It was caused by the Discourse reactions like sync setting. I don’t know if there is a way to avoid it other than disabling it. [תמונה] Reaction like sync issues Support I don’t know if you were able to fix it, but in our case we also have a lot of posts and likes. For now, we have opted to disable the Discourse reactions like sync because it was causing those CPU peaks every 60 minutes and a lot of 502 errors. [The image displays a time-lapse of CPU usage for a 'ys' and 'user' context, with noticeable fluctuations in both before and after enabling synchronization for 'Discourse reactions' between 15:00 and 21:00. (Captioned by AI)]

Update: After upgrading the server, the issue seems to have been minimized. [image] However, the sames errors still occur every hour while the postgres:13/main: discourse discourse [local] UPDATE command is running, which corresponds to the spikes in the chart. Does anyone have suggestions on what might be causing this and how to resolve it?

Same problem here. Almost once every hour you are not able to post anything for 15 to 20 minutes, with a “502 error”. I don’t know what’s not working

Did you recently upgrade? Anyhow… here are a couple recent threads with high cpu usage rebuilding may help [תמונה] High CPU usage (Ruby) Support Yeah fair play to the DC team they are usually very good. If I hadn’t have moved two other forums over I could have been more confident in saying it was related to up update (even though my hunch was saying it probably was) glad you and @markschmucker were on the ball and noticed the increase as well! Welcome to Discourse btw! +1 [תמונה] Increased CPU Usage since 3.4.0.beta4-dev ( 58f75ed205 ) upgrade Support Note, closing the loop, the bug causing it was this: https://github.com/rubyjs/mini_racer/commit/edaa9e862abcd9945fbfcdd115d02dd7326569cf I updated the gem. One immediate advantage is that it appears this version of v8 uses slightly less memory which is nice. [תמונה] Post 3.5.1 update - CPU maxed out 100% Support Rebuild has worked and calmed things down so far. I do not see those postgres process in HTOp or at leat they are not anywhere near the top like before.

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Erzgebirge 18 בפברואר,‏ 2025,‏ 10:21am 5

I did upgrade recently and the same problem appears quite often, every hour or so, as before.

Thank you for sharing those threads, will take a look!

נושא		תגובות	צפיות
Unusually high CPU usage Self-hosting	31	1512	18 בפברואר,‏ 2026
Increased CPU Usage since 3.4.0.beta4-dev ( 58f75ed205 ) upgrade Product Support	11	500	7 בפברואר,‏ 2025
Post 3.5.1 update - CPU maxed out 100% Product Support	4	263	4 בפברואר,‏ 2025
CPU spikes seem to be crashing our server Self-hosting server-resources	7	1711	21 ביוני,‏ 2017
Bursts of 502 Service Unavailable, pointers to debug Self-hosting	15	1843	18 בפברואר,‏ 2018

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