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Chenyi Wang
a25a4fbcfe
### Summary With multi-actor worker support (#1836) enabled by default (`--max-actors=1000`), selecting a single worker uniformly at random across all candidates with remaining capacity can stack actors onto busy workers while lighter workers exist, whereas strict global least-loaded selection over the asynchronous watch cache can cause concurrent bursts to herd onto the same worker. This change updates `Scheduler.Schedule` to use **power of two choices**: sample two distinct eligible candidates that satisfy `HasRoom` and pick the less-loaded one, comparing actor-slot utilization (`Allocated.Actors / Capacity.Actors`) first and breaking ties on dominant compute-resource utilization (CPU/memory). ### Testing - Added unit tests covering power-of-two-choices ordering, heterogeneous worker actor-capacity utilization, compute-resource utilization tie-breaking, fallback when an idle worker lacks resource room, and tie-breaking reachability in `cmd/ateapi/internal/scheduling/scheduling_test.go`. - [x] Tests pass - [ ] Appropriate changes to documentation are included in the PR