0:  real 29.80 user 0.13 sys 21.36
1:  real 30.27 user 0.15 sys 21.40
2:  real 29.49 user 0.11 sys 20.39
3:  real 30.72 user 0.13 sys 22.53
0:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.99121 s, 8.6 GB/s real 3.99 user 0.01 sys 3.96
1:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.8217 s, 9.0 GB/s real 3.82 user 0.01 sys 3.80
2:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.71791 s, 9.2 GB/s real 3.71 user 0.03 sys 3.68
3:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.98993 s, 8.6 GB/s real 3.99 user 0.01 sys 3.97