Each row inserts n items into an initially empty table.

double the size        n=     1000 work=         2023 work/insert=      2.023  expansions=11  final size=1024
triple the size        n=     1000 work=         2093 work/insert=      2.093  expansions=8  final size=2187
add 100 slots          n=     1000 work=         5500 work/insert=      5.500  expansions=10  final size=1000

double the size        n=    10000 work=        26383 work/insert=      2.638  expansions=15  final size=16384
triple the size        n=    10000 work=        19841 work/insert=      1.984  expansions=10  final size=19683
add 100 slots          n=    10000 work=       505000 work/insert=     50.500  expansions=100  final size=10000

double the size        n=   100000 work=       231071 work/insert=      2.311  expansions=18  final size=131072
triple the size        n=   100000 work=       188573 work/insert=      1.886  expansions=12  final size=177147
add 100 slots          n=   100000 work=     50050000 work/insert=    500.500  expansions=1000  final size=100000

double the size        n=  1000000 work=      2048575 work/insert=      2.049  expansions=21  final size=1048576
triple the size        n=  1000000 work=      1797161 work/insert=      1.797  expansions=14  final size=1594323
add 100 slots          n=  1000000 work=   5000500000 work/insert=   5000.500  expansions=10000  final size=1000000

Doubling stays below its bound of 3 units per insert and tripling
below its bound of 2.5: both constant.  Adding a fixed 100 slots grows
without bound -- about n/200 per insert, which is Theta(n).
