[R-package] [c++] add tighter multithreading control, avoid global OpenMP side effects (fixes #4705, fixes #5102) #6677
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| Job | Run time |
|---|---|
| 3m 18s | |
| 21m 51s | |
| 17m 19s | |
| 13m 17s | |
| 7m 41s | |
| 14m 14s | |
| 11m 26s | |
| 15m 39s | |
| 2s | |
| 1h 44m 47s |