Advice/Guidance - query components more than 8

[bolom009]

Hello everyone :)
I faced with query case where I need to get more than 8 components from entity, so is it possible to get 8-14 components from entity and don't hit performance? based on doc I can use Filter8 and Map0-12, but Map0-12 hit the performance :(

[mlange-42]

You mean that maps are slower than queries? That's natural and there is no way around it.

You could query for 8, use With to ensure that the other are also on the entities, and a map to get them. Further, you could use queries from the unsafe API, but it is also a bit slower then normal queries.

However, without knowing your code, the fact that you need to query so many components suggest that you should probably rethink your components and/or systems.

[bolom009]

I faced with this case in my combat system, where I'm quering 9 components, so I did Filter8 and Map1, but as you said Map1 slower x2 then Filter8 :( Why Map has 1-2 but Filter has 1-8 only? :) Can you extend Filtler to 12 also? :)

[bolom009]

or another small idea, is it possible to make generatable code for filter map count? :) for example I wanna generate Map and Filter only for 5 or for 15 items

[mlange-42]

Because requiring a query over more than 8 components tends to indicate a flawed design, while creating an enitity with many components does not.

Are you sure that you still filter for the same number of entities? I.e., do you have the excess components in the filter's With? Because Map1 should be slower than Filter1, but not 2x slower than Filter8.

https://mlange-42.github.io/ark/benchmarks/#world-access

[mlange-42]

or another small idea, is it possible to make generatable code for filter map count? :) for example I wanna generate Map and Filter only for 5 or for 15 items

Code generation is here. But the generated code will not work in another module, as it accesses private fields.

[mlange-42]

BTW, if you know that the entity is alive (which it definitely is if you encounter it in a query, you can also use MapX.GetUnchecked).

[bolom009]

Lemme describe my case, maybe I'm doing something wrong

For example:
I have system ranged_attack, so for this system I need components like

• Transoform, Health, AttackRange, AttackSpeed, Target, Team, State, Stats, Stacks, Projectile

Ok I rethink my case about Health, I can create new component Alive and don't check health in this system, so left 9 components

[bolom009]

Ok, nevermind I will rethink my systems :) It's good point about flawed design