Fix test for unset PPC_NUM_THREADS environment variable (#461)
#2921
| Job | Run time |
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| 15s | |
| 4s | |
| 2m 48s | |
| 1m 20s | |
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| 2m 55s | |
| 2m 48s | |
| 6m 27s | |
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| 5m 23s | |
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| 2m 55s | |
| 1m 34s | |
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| 2m 58s | |
| 3m 45s | |
| 1m 31s | |
| 3m 49s | |
| 1m 35s | |
| 1h 41m 11s |