0:  real 49.03 user 2.04 sys 18.27
1:  real 51.31 user 2.06 sys 18.75
2:  real 50.79 user 2.03 sys 18.03
3:  real 50.92 user 2.05 sys 18.44
0:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.85308 s, 8.9 GB/s real 3.85 user 0.13 sys 3.71
1:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.92918 s, 8.7 GB/s real 3.92 user 0.12 sys 3.79
2:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.95505 s, 8.7 GB/s real 3.95 user 0.12 sys 3.81
3:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.95104 s, 8.7 GB/s real 3.95 user 0.12 sys 3.81