Tribus 4way 8 threads:
[2017-12-17 15:45:48][2017-12-17 15:49:10] [2017-12-17 17:05:32] tribus block 449483, diff 735.578
[2017-12-17 17:05:32] CPU #7: 461.65 kH, 398.07 kH/s
[2017-12-17 17:05:32] CPU #6: 460.63 kH, 398.21 kH/s
[2017-12-17 17:05:32] CPU #5: 460.43 kH, 397.70 kH/s
[2017-12-17 17:05:32] CPU #2: 460.88 kH, 397.74 kH/s
[2017-12-17 17:05:32] CPU #4: 460.51 kH, 397.76 kH/s
[2017-12-17 17:05:32] CPU #3: 460.82 kH, 398.03 kH/s
[2017-12-17 17:05:32] CPU #0: 454.80 kH, 393.86 kH/s
[2017-12-17 17:05:32] CPU #1: 463.35 kH, 399.53 kH/s
Apparently Tribus 4way likes SMT/HT here.
It's interesting that the thread rate didn't increase with fewer threads. Were the threads spread over
all 8 cores? You can try "-t 8 --cpu-affinity 0x5555" to select alternate vcores.