Can jobs spawn other jobs?

[drifting stream]

Is it possible to have one job parallel job spawn other parallel jobs?

[thorn bramble]

no and you wouldn't want that anyway - scheduling of job is costly

[drifting stream]

I want schedule Y parallel spawn jobs from X spawners, what is the best pattern for this? Inline a 'job' within the ISystem OnUpdate by running a query for the X spawners? Then ScheduleParallel the Y spawn jobs?

[thorn bramble]

YOu can't schedule jobs from within jobs. Scheduling is main thread only

you should never rely on loop of jobs in general

because it's slow and 99% of time can be done within just one job

[drifting stream]

Sounds like the correct approach would be to have a single system per spawner, and to schedule a single job to instantiate all prefabs from a loop within the job?

If I'm spawning > 100k entities. Would not having spawn logic run concurrently be beneficial? Though I do guess the instantiate calls get queued on the parallel writer ecb. So I guess it would depend how much compute is being used before the instantiate.

[thorn bramble]

no

one system/job per all spawners

that would be correct approach

and most perfomant one

[opaque flume]

for really large quantities of instantiating, its fastest to use the entitymanager with a nativearray over an ecb