0:  real 5.29 user 0.04 sys 4.22
1:  real 5.80 user 0.03 sys 4.19
2:  real 5.35 user 0.03 sys 3.71
3:  real 6.14 user 0.03 sys 4.21
0:  262144+0 records in 262144+0 records out real 2.40 user 0.08 sys 2.31
1:  262144+0 records in 262144+0 records out real 2.33 user 0.08 sys 2.25
2:  262144+0 records in 262144+0 records out real 2.45 user 0.07 sys 2.37
3:  262144+0 records in 262144+0 records out real 2.39 user 0.08 sys 2.30