this post was submitted on 01 Jul 2023
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Lemmy.World Announcements

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Looks like it works.

Edit still see some performance issues. Needs more troubleshooting

Update: Registrations re-opened We encountered a bug where people could not log in, see https://github.com/LemmyNet/lemmy/issues/3422#issuecomment-1616112264 . As a workaround we opened registrations.

Thanks

First of all, I would like to thank the Lemmy.world team and the 2 admins of other servers @stanford@discuss.as200950.com and @sunaurus@lemm.ee for their help! We did some thorough troubleshooting to get this working!

The upgrade

The upgrade itself isn't too hard. Create a backup, and then change the image names in the docker-compose.yml and restart.

But, like the first 2 tries, after a few minutes the site started getting slow until it stopped responding. Then the troubleshooting started.

The solutions

What I had noticed previously, is that the lemmy container could reach around 1500% CPU usage, above that the site got slow. Which is weird, because the server has 64 threads, so 6400% should be the max. So we tried what @sunaurus@lemm.ee had suggested before: we created extra lemmy containers to spread the load. (And extra lemmy-ui containers). And used nginx to load balance between them.

Et voilΓ . That seems to work.

Also, as suggested by him, we start the lemmy containers with the scheduler disabled, and have 1 extra lemmy running with the scheduler enabled, unused for other stuff.

There will be room for improvement, and probably new bugs, but we're very happy lemmy.world is now at 0.18.1-rc. This fixes a lot of bugs.

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[–] klp@lemmy.world 4 points 1 year ago

Thanks for the update. I especially like the transparency on not only the β€œupgrade” itself but also the potential issues encountered, together with the solutions. Seems rare nowadays, or I’m just seeing less and less people doing this.

[–] EmielBlom@lemm.ee 4 points 1 year ago (2 children)

Nice, really liking the update! Some questions about development for the fediverse: Is the code for running Lemmy written by one or person or a smome core team?

Is there any decision making process as to which features will be worked on in the next release or which bugs to prioritize?

In theory what would happen if the original developers started making changes that other people don't agree with? Would we get a fork then where servers have to choose to adopt it or not?

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[–] Rooki@lemmy.world 4 points 1 year ago (1 children)

Is there a issue with the api? ( Because the api wrapper lemmy-js-client doesnt work on login. ) I tried it yesterday but not today yet. I will test it when i can :)

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[–] Richie@lemmy.world 4 points 1 year ago (1 children)

Awesome! Loading issues are still the bane of Lemmy's existence though, or at least it is for me and my experience with Lemmy. Everything just loads so slow. Sorting is still broken as well. Communities that I KNOW that are active just show as blank for me no matter what I sort by.

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[–] Netrunner@lemmy.world 4 points 1 year ago

I can finally login!

[–] stickyfranklin@lemmy.world 4 points 1 year ago
[–] cute_cat@lemmy.world 4 points 1 year ago

I really enjoy how lemmy is growing!

[–] cute_cat@lemmy.world 4 points 1 year ago

I really enjoy how lemmy is growing!

[–] nico@r.dcotta.eu 4 points 1 year ago* (last edited 1 year ago) (1 children)

Have you considered running your Lemmy instance on more than a single machine? If it is possible to run two lemmy containers anyway (ie, lemmy is not a singleton), why not run them on separate machines? With load balancing you could achieve a more stable experience. It might be cheaper to have many mediocre machines rather than a single powerful one too, as well as more sustainable long-term (vertical vs horizontal scaling).

The downside would be that the set-up would be less obvious than with Docker compose and you would probably need to get into k8s/k3s/nomad territory in order to orchestrate a proper fleet.

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[–] Calzoner@lemmy.world 3 points 1 year ago

This is awesome. Was a fun read too. Super cool to see what was going on behind the scenes.

[–] hydra@lemmy.world 3 points 1 year ago

Seems to work good enough!

[–] ChriskiV@lemmy.world 3 points 1 year ago

Signed into Jerboa! Thanks devs!

[–] srasmus@lemmy.world 3 points 1 year ago

Excellent work!

[–] AlmightySnoo@lemmy.world 3 points 1 year ago (1 children)

obviously not critical, but it looks like there's a small sidebar bug (or feature?) that puts the pic near the instance name if it is the first thing in its description?

I think that's a feature. But not 100% sure πŸ˜…
But honestly, I like the look. If it is a bug, it should become a feature 🀣

[–] nucleative@lemmy.world 3 points 1 year ago

Working well here and can use Jerboa again. Although wefwef is really growing on me!

Edit: couldn't post from Jerboa, got network error. But wefwef worked.

[–] Olap@lemmy.world 3 points 1 year ago

Let us know where donations can go, suspect a stacked docker-compose will reach limits very quickly

[–] HexesofVexes@lemmy.world 3 points 1 year ago

Thanks for getting the update out!

Definitely weird that it was 1500 instead of some power of 2*100!

Also, when we finally get a 128 thread machine just think of the meme potential!

[–] DSquared@lemmy.world 3 points 1 year ago

Hurray! Works well for me so far.

[–] ami@lemmy.world 3 points 1 year ago

Amazing work! It seems much more performant now, everything seems to be loading faster.

0.18 looks a lot better. Far better use of screen real estate on PCs.

Lag is still very prevalent though. Page loading, upvote delay. It's frustrating.

Live comments (like on new Reddit) does not seem to be working on 0.18, so I have to manually refresh the page each time. That also resets the comment sort to Hot, causing further annoyance.

[–] dasnet@mastodon.social 3 points 1 year ago
[–] cute_cat@lemmy.world 3 points 1 year ago

I really enjoy how lemmy is growing!

[–] Never_Sm1le@sopuli.xyz 3 points 1 year ago (4 children)

Tried to login but nothing happen except a "?" was added into the link. Tried delete data, cookie, etc but the probelm still persist. Comment from other instance

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[–] DigitalPortkey@lemmy.world 3 points 1 year ago

Absolutely loving the new UI changes. Thanks for being so transparent with us as well!

[–] ubergeek77@lemmy.ubergeek77.chat 3 points 1 year ago* (last edited 1 year ago)

Running so many Lemmy instances against the same database doesn't cause race conditions? I wonder why that "just worked" so easily, usually load balancing DB-backed apps is a whole beast on its own.

[–] feitingen@lemmy.world 3 points 1 year ago

It seems there is still some performance issues.

Maybe consider a webcache like varnish to take some of the load off?

[–] kazerniel@lemmy.world 3 points 1 year ago

It keeps logging me out, plus when I log in, alarmingly other users' profile names flash in the top right corner for a second.

[–] MyOpinion@lemmy.world 3 points 1 year ago (3 children)

It has been near unusable since the upgrade.

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[–] MKBandit@lemmy.world 3 points 1 year ago

Quick everyone show Appreciation before they notice

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