0:  real 13.14 user 0.05 sys 11.55
1:  real 13.31 user 0.05 sys 11.11
2:  real 13.05 user 0.06 sys 11.49
3:  real 13.26 user 0.06 sys 11.52
0:  262144+0 records in 262144+0 records out real 3.07 user 0.09 sys 2.96
1:  262144+0 records in 262144+0 records out real 3.01 user 0.08 sys 2.91
2:  262144+0 records in 262144+0 records out real 3.07 user 0.08 sys 2.98
3:  262144+0 records in 262144+0 records out real 2.97 user 0.08 sys 2.88