All subapps use their own ComputeTaskPool by default

[james7132]

Bevy version

de2b1a4, also happens in v0.7.

Operating system & version

Any

What you did

Use RenderPlugin via DefaultPlugins

What you expected to happen

A single global ComputeTaskPool is spawned, with a 1:1 correspondence with the number of logical CPU cores on the machine (32).

What actually happened

Two separate ComputeTaskPool s were spawned, one for each subapp. A total of 65 threads were spawned (1 main + 32 for each sub app).

Additional information

ParallelExecutor inserts a default CompteTaskPool if there isn't one stored as a resource. When spawning the render sub-app, the main world's ComputeTaskPool is not cloned and inserted into the render app's.