Migrate host_task object management to a thread pool based approach
#6465
| Job | Run time |
|---|---|
| 5m 42s | |
| 5m 38s | |
| 9m 2s | |
| 8m 30s | |
| 9m 40s | |
| 8m 52s | |
| 6m 11s | |
| 6m 26s | |
| 7m 53s | |
| 8m 58s | |
| 5m 55s | |
| 6m 25s | |
| 5m 0s | |
| 4m 42s | |
| 2m 11s | |
| 3m 13s | |
| 2m 15s | |
| 2m 10s | |
| 2m 35s | |
| 2m 42s | |
| 3m 59s | |
| 3m 23s | |
| 3m 41s | |
| 4m 7s | |
| 4m 41s | |
| 3m 35s | |
| -1s | |
| 0s | |
| 0s | |
| 2h 17m 25s |