## About The Pull Request
As the title says.
`init_order` is no more, subsystems ordering now depends on their
declared dependencies.
Subsystems can now declare which other subsystems need to init before
them using a list and the subsystem's typepath
I.e.
```dm
dependencies = list(
/datum/controller/subsystem/atoms,
/datum/controller/subsystem/mapping
)
```
The reverse can also be done, if a subsystem must initialize after your
own:
```dm
dependents = list(
/datum/controller/subsystem/atoms
)
```
Cyclical dependencies are not allowed and will throw an error on
initialization if one is found.
There's also a debug tool to visualize the dependency graph, although
it's a bit basic:
Subsystem load ordering can still be controlled using `init_stage`, some
subsystems use this in cases where they must initialize first or last
regardless of dependencies. An error will be thrown if a subsystem has
an `init_stage` before one of their dependencies.
## Why It's Good For The Game
Makes dealing with subsystem dependencies easier, and reduces the chance
of making a dependency error when needing to shift around subsystem
inits.
## Changelog
🆑
refactor: Refactored subsystem initialization
/🆑
About The Pull Request
Just to be clear, when I refer to time here, I am not talking about cpu time. I'm talking about real time.
This doesn't significantly reduce the amount of work we do, it just removes a lot of the waiting around we need to do for db calls to finish.
Adds queuing support to sql bans, so if an ongoing ban retrieval query is active any successive ban retrieval attempts will wait for the active query to finish
This uses the number/blocking_query_timeout config option, I hope it's still valid
This system will allow us to precache ban info, in parallel (or in batches)
With this, we can avoid needing to setup all uses of is_banned_from to support parallelization or eat the cost of in-series database requests
Clients who join after initialize will now build a ban cache automatically
Those who join before init is done will be gathered by a batch query sent by a new subsystem, SSban_cache.
This means that any post initalize uses of is_banned_from are worst case by NATURE parallel (since the request is already sent, and we're just waiting for the response)
This saves a lot of headache for implementers (users) of the proc, and saves ~0.9 second from roundstart setup for each client (on /tg/station)
There's a lot of in series is_banned_from calls in there, and this nukes them. This should bring down roundstart join times significantly.
It's hard to say exactly how much, since some cases generate the ban cache at other times.
At base tho, we save about 0.9 seconds of real time per client off doing this stuff in parallel.
Why It's Good For The Game
When I use percentages I'm speaking about cost per player
I don't like how slow roundstart feels, this kills about 66% of that. the rest is a lot of misc things. About 11% (it's actually 16%) is general mob placing which is hard to optimize. 22% is manifest generation, most of which is GetFlatIcons which REALLY do not need to be holding up the main thread of execution.
An additional 1 second is constant cost from a db query we make to tell the server we exist, which can be made async to avoid holding the proc chain.
That's it. I'm bullying someone into working on the manifest issue, so that should just leave 16% of mob placing, which is really not that bad compared to what we have now.
Changelog
cl
code: The time between the round starting and the game like, actually starting has been reduced by 66%
refactor: I've slightly changed how ban caches are generated, admins please let me know if anything goes fuckey
server: I'm using the blocking_query_timeout config. Make sure it's up to date and all.
/cl
