0:  real 29.30 user 0.10 sys 19.86
1:  real 29.20 user 0.15 sys 19.66
2:  real 29.59 user 0.15 sys 20.27
3:  real 29.42 user 0.13 sys 20.16
0:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.81127 s, 9.0 GB/s real 3.81 user 0.00 sys 3.79
1:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.56932 s, 9.6 GB/s real 3.56 user 0.01 sys 3.54
2:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.55181 s, 9.7 GB/s real 3.55 user 0.01 sys 3.53
3:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.8484 s, 8.9 GB/s real 3.84 user 0.02 sys 3.82