Add init_worker_code for code that runs once per worker
#193
| Job | Run time |
|---|---|
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| 1m 33s | |
| 2m 9s | |
| 2m 31s | |
| 2m 39s | |
| 2m 10s | |
| 2m 37s | |
| 1m 50s | |
| 2m 15s | |
| 2m 37s | |
| 1m 44s | |
| 1m 54s | |
| 1m 45s | |
| 2m 46s | |
| 3m 12s | |
| 2m 28s | |
| 1m 53s | |
| 1m 21s | |
| 2m 22s | |
| 1m 42s | |
| 43m 15s |