Allow ThreadPool to run jobs in both modes, and improve scheduling
#1378
| Job | Run time |
|---|---|
| 34s | |
| 37s | |
| 2m 54s | |
| 26m 36s | |
| 1m 20s | |
| 2m 39s | |
| 1s | |
| 14m 10s | |
| 1s | |
| 2m 58s | |
| 15m 7s | |
| 3m 26s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 0s | |
| 1h 10m 23s |