0:  real 51.38 user 0.19 sys 22.23
1:  real 52.90 user 0.17 sys 22.43
2:  real 52.60 user 0.24 sys 22.16
3:  real 52.48 user 0.25 sys 22.03
0:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.7934 s, 9.1 GB/s real 3.79 user 0.01 sys 3.77
1:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.81995 s, 9.0 GB/s real 3.82 user 0.01 sys 3.79
2:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.8648 s, 8.9 GB/s real 3.86 user 0.02 sys 3.83
3:  262144+0 records in 262144+0 records out 34359738368 bytes (34 GB) copied, 3.80313 s, 9.0 GB/s real 3.80 user 0.01 sys 3.78