[R-package] [c++] add tighter multithreading control, avoid global OpenMP side effects (fixes #4705, fixes #5102) #6665
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| Job | Run time |
|---|---|
| 3m 27s | |
| 4m 59s | |
| 4m 59s | |
| 3m 18s | |
| 2m 32s | |
| 4m 20s | |
| 4m 30s | |
| 5m 54s | |
| 4s | |
| 34m 3s |