0:  real 49.16 user 0.13 sys 20.01
1:  real 49.59 user 0.19 sys 21.65
2:  real 49.54 user 0.16 sys 23.31
3:  real 49.46 user 0.12 sys 21.58
0:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.74268 s, 9.2 GB/s real 3.74 user 0.02 sys 3.71
1:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.79029 s, 9.1 GB/s real 3.79 user 0.00 sys 3.77
2:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.81043 s, 9.0 GB/s real 3.81 user 0.01 sys 3.79
3:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.74572 s, 9.2 GB/s real 3.74 user 0.01 sys 3.72