[Merged by Bors] - early return from multithreaded executor #7521
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This will need to be rebased on top of #7519. |
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# Objective - There is a small perf cost for starting the multithreaded executor. ## Solution - We can skip that cost when there are zero systems in the schedule. Overall not a big perf boost unless there are a lot of empty schedules that are trying to run, but it is something. Below is a tracy trace of the run_fixed_update_schedule for many_foxes which has zero systems in it. Yellow is main and red is this pr. The time difference between the peaks of the humps is around 15us. 
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Objective
Solution
Below is a tracy trace of the run_fixed_update_schedule for many_foxes which has zero systems in it. Yellow is main and red is this pr. The time difference between the peaks of the humps is around 15us.