Add per=thread to tests that assume this
#363
| Job | Run time |
|---|---|
| 3m 22s | |
| 1m 50s | |
| 1m 53s | |
| 1m 48s | |
| 1m 45s | |
| 2m 2s | |
| 2m 2s | |
| 1m 40s | |
| 1m 35s | |
| 1m 39s | |
| 1m 34s | |
| 1m 44s | |
| 1m 13s | |
| 1m 53s | |
| 1m 36s | |
| 1m 29s | |
| 1m 35s | |
| 1m 31s | |
| 1m 28s | |
| 1m 41s | |
| 2m 0s | |
| 1m 33s | |
| 1m 23s | |
| 1m 31s | |
| 1m 22s | |
| 43m 9s |