Allow ThreadPool to run jobs in both modes, and improve scheduling
#1226
| Job | Run time |
|---|---|
| 26m 46s | |
| 13m 53s | |
| 41s | |
| 3m 40s | |
| 17m 49s | |
| 3m 52s | |
| 1m 19s | |
| 5m 3s | |
| 17m 48s | |
| 3m 43s | |
| 14m 29s | |
| 41s | |
| 3m 47s | |
| 2m 22s | |
| 29s | |
| 2m 21s | |
| 1m 16s | |
| 31s | |
| 3m 24s | |
| 37s | |
| 32s | |
| 1m 19s | |
| 29s | |
| 33s | |
| 30s | |
| 0s | |
| 2h 7m 54s |