[R-package] [c++] add tighter multithreading control, avoid global OpenMP side effects (fixes #4705, fixes #5102) #6668
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| Job | Run time |
|---|---|
| 3m 29s | |
| 13m 28s | |
| 12m 55s | |
| 16m 52s | |
| 7m 25s | |
| 16m 3s | |
| 12m 40s | |
| 17m 49s | |
| 4s | |
| 1h 40m 45s |