By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Add --mutation-coverage-jobs to cap coverage parallelism Test suites with expensive per-test setup (e.g. tmp-postgres) can overwhelm the system when getNumCapabilities children try to start at once. Expose a knob to limit it. mutationCheck.nix gets a coverageJobs argument that, when set, passes the flag to both the first-suite and extra-suite coverage invocations.
| Time to Start | Worker time | Duration | Time to finish | Idle | |
| Config | 0s | 2s | 2s | 2s | 0s |
| Eval | 3s | 38s | 38s | 41s | 0s |
| Build | 6s | 25m47s | - | - | 0s |
| Suite | 0s | 26m28s | - | - | 121h28m31s |