We just had peak traffic of approx 1,500 concurrent (mostly anonymous) users visiting a single page. And the forum went into the mode, where the warning is displayed to all members concerning high load. CPU-Optimized Digital Ocean Droplet Dedicated CPU: 4 vCPUs RAM: 8 GB Unicorn workers: 10 Gi…

Yes, increasing unicorns is the first step here.

I have increased the workers to 24. No difference (goes still into “Due to extreme load, this is temporarily being shown to everyone as a logged-out user would see it.”), with a similar concurrent visitor peak (99% anonymous) just now: [image]

I know @sam has spent a lot of time on this recently and might have commentary?

@sam Any ideas on how to further optimize for peak traffic from anonymous traffic (e.g. if a singe topic goes viral on social media). In both cases outlined above, memory and CPU still have plenty of room (according to Digital Ocean), and we have not even hit a load of 4, still, the forum goes into …

[image] Just went into “extreme load mode” again, with only 600 concurrent visitors total (99% anonymous) and a load of not even 1.

I believe the DO data monitor is not sensitive enough and somewhat misleading. I experimented with extreme load with Hetzner and Digital ocean. With Hetzner when the extreme load message came up there was a short sharp peak where it would go to 120%. It lasted maybe a second, before dropping down…

We are going to need prometheus exporter reports to look any deeper. If you have the ram and the cpu … you can always add more unicorn workers, that will scale up for these peaks. You just don’t want to swap memory, cause performance will go way down.

[afbeelding] Terrapop: Any ideas on how to further optimize for peak traffic from anonymous traffic (e.g. if a singe topic goes viral on social media). Seems like in such a case that single topic page should be able to be cached and served statically for a short period without having to hit t…

That already happens dynamically under measured load on a per-topic basis, that’s exactly what [afbeelding] Terrapop: the forum went into the mode, where the warning is displayed to all members concerning high load. .. is referring to. It’s READ ONLY though, so people can’t actually have con…

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Ondersteuning

Falco (Falco) 21 februari 2021 om 01:23 7

You need to collect some data so we know what is the bottleneck.

Prometheus exporter plugin for Discourse

Topic		Antwoorden	Weergaven
High CPU usage (Ruby) Support server-resources	20	764	3 februari 2025
Best configurations for speeding up standalone discourse Self-hosting server-resources	25	4311	14 februari 2024
Optimizing the number of Unicorns and buffer size Self-hosting server-resources	22	6926	9 juni 2018
Getting extreme load warning while server resources are not being used Self-hosting	5	962	2 september 2021
Recommendation for number of workers: cores × 2? Self-hosting	16	449	29 april 2025

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