Like does content get mirrored to my instance and then mine distributes it ala BitTorrent or is my instance it’s own thing?
Yes but only if you have a lot of users eventually. So your server can serve up hundreds of requests from several different federated servers (eg: maybe some content from beehaw, other content from lemmy.world) instead of 1 server (maybe lemmy.world) having to serve that same content 100 times from all over the place.
If its only you and no other users, then not.
It will take part of the load off, but the server still has a push updates to every instance subscribed to one of its communities. But I would guess that is much less of a demand than having an active user using the instance.
In effect, not really.
All the communities you’re subscribed to will now also have to push all their updates (posts, comments, upvotes) to your server, even when you’re not interacting with Lemmy.
As someone else mentioned, it would only be efficient once you have a decent (hard to pinpoint) amount of users on your server.
They’ll do it once, though. Then every time you view it, you’re helping the bigger servers by serving it from your instance.
Yes. Once for every post, comment and vote.
So say you have your own personal instance, and you use that to follow community news on lemmy.world. If throughout the day that community receives 10 new topics, 50 comments and 100 upvotes, it would have to make 160 calls to your server.
So when you decide to read those 10 topics (if you even read all of them), you would then make roughly 10 api calls.
You would be saving those last mentioned 10 calls by using your own instance, but at the cost of 160 calls made throughout the day.
The thing is that when you interact with the remote server directly it’s not 10 api calls, it’s 10 full-blown HTML webpages that have to be served to you, which are way bigger than REST API calls.
So you need just 15 more users on your instance to break even, if you have 17 in total, you’ve saved 10 calls.
Broadly, yes. The way federation works means anything any user on your instance is interested in will be sent to you once (at least posts/comments/votes/etc). Whenever someone on your instance views that thing that is a request that would otherwise be made to another instance. This does, however, increase the load of federation on servers hosting popular communities, as now they have to send each post/comment/vote/whatever to your instance. Unlike bit torrent there is only one place responsible for sending you all of the content that exists in a community, so the fediverse doesn’t get p2p-style network effects where every peer/sever helps even a bit.
A single user instance is a little inefficient, unless you are actually looking at most/all of the content your instance receives, in which case it is probably a wash. The ideal for how federation is implemented in ActivityPub would be many similarly-sized (in terms of user count) instances with the most popular communities being spread out among them.
Sadly right now the most popular instances (lemmy.world, lemmy.ml, lemmynsfw.com, kbin.social) are both where users and communities are, so the real gains to help those instances (several of which continue to struggle under the load) are really only medium and larger sized instances.
Isn’t a semi-significant amount of the per instance load in the database interactions though? I don’t know if that’s still true after some of the optimizations in 0.18, but by having your own instance, even 1 person instance, you no longer load the database of another instance with calculating hot/active/whatever for things you want to see, and you don’t load it when you do pulls.
There is certainly an inflection point. I am not sure where it falls. If you rarely use Lemmy the other servers are expending effort federating to you for no reason, so for a heavy single user it is probably a positive. I imagine it also varies based on how you browse as “new” is probably “lighter” than “hot” or “active”.
Sure, but the server calculates the hot/active every 15 minutes regardless of whether or not you browse it. It’s calculated on a timed job so it’s always fresh and ready for everyone.
These posts are really useful to get a grasp of ActivityPub (if you have a programming background): https://rknight.me/building-an-activitypub-server/ https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
And of course the official spec (although its less useful): https://www.w3.org/TR/activitypub/
Should be. One instance hosting lot of community vs one instance hosting one community is less load. But your instance have to be popular enough to make a dent in the popular instances users.
