$ ./a.out 10000000 data
[0000000000.000000] begin
[0000000001.299480] data READ and ALLOCATED
N=10000000; tab = 160002048, ss = 14680064
[0000000008.945925] built BDZ for syms
[0000000000.003773] mph dump & reload
[0000000005.915059] inplace REORDER done
[0000000036.457684] built CHM for vals
[0000000000.086798] mph dump & reload
mph size when packed: syms = 3459398, vals = 83600028
[0000000006.374049] completed VERIFY
[0000000000.518565] fgets loop
[0000000001.192738] fgets+strtoul loop
[0000000003.706227] SYMS search and compare
cksum=49999995000000
[0000000004.366025] VALS search and compare
cksum=49999995000000
[0000000000.000012] done.