128 buckets vs 64 buckets
Plot size is: 32
Buffer size is: 28000MiB
Using 2 threads of stripe size 65536
Using optimized chiapos
128 buckets (blue) overall
Time for phase 1 = 5074.508 seconds. CPU (162.030%)
Time for phase 2 = 2212.331 seconds. CPU (90.880%)
Time for phase 3 = 3109.913 seconds. CPU (139.740%)
Time for phase 4 = 284.687 seconds. CPU (102.400%)
Total time = 10681.442 seconds. CPU (139.220%)
64 buckets (red) overall
Time for phase 1 = 5216.343 seconds. CPU (160.510%)
Time for phase 2 = 2314.673 seconds. CPU (90.890%)
Time for phase 3 = 3341.300 seconds. CPU (139.510%)
Time for phase 4 = 309.550 seconds. CPU (102.170%)
Total time = 11181.868 seconds. CPU (138.210%)
Memory average
Temporary space usage
CPU average usage
IOPS average
Conclusion
I didn’t find reasons to use 64 buckets (for 2 threads; will try 4 threads later). Just higher CPU and memory usage and 500 seconds slower. No profits found yet.