50 million inserts (100byte value + u32 key) / 6m in-memory limit

gistfile1.txt

[  t min,   t max)        ops count           %
--------------------------------------------------
[      0,       1)         49935562       99.87 
[      1,       2)             5495        0.01 
[      2,       3)             6593        0.01 
[      3,       4)             6816        0.01 
[      4,       5)             6633        0.01 
[      5,       6)             6863        0.01 
[      6,       7)             6811        0.01 
[      7,       8)             6480        0.01 
[      8,       9)             5392        0.01 
[      9,      10)             2961        0.01 
[     10,      12)             2700        0.01 
[     12,      14)             2111        0.00 
[     14,      16)             1810        0.00 
[     16,      18)             1434        0.00 
[     18,      20)              366        0.00 
[     20,      25)              347        0.00 
[     25,      30)              124        0.00 
[     30,      35)               42        0.00 
[     35,      40)               31        0.00 
[     40,      45)               37        0.00 
[     45,      50)               51        0.00 
[     50,      60)              128        0.00 
[     60,      70)              272        0.00 
[     70,      80)              263        0.00 
[     80,      90)              106        0.00 
[     90,     100)               88        0.00 
[    100,     120)              190        0.00 
[    120,     140)              125        0.00 
[    140,     160)               10        0.00 
[    160,     180)                3        0.00 
[    180,     200)                2        0.00 
[    200,     250)                6        0.00 
[    250,     300)                6        0.00 
[    300,     350)               10        0.00 
[    350,     400)               13        0.00 
[    400,     450)               26        0.00 
[    450,     500)               19        0.00 
[    500,     600)               40        0.00 
[    600,     700)               14        0.00 
[    700,     800)                7        0.00 
[    800,     900)                7        0.00 
[    900,    1000)                3        0.00 
[   1000,    1200)                3        0.00 
--------------------------------------------------
total:      921418         50000000        100%
min latency       : 0.001907 * 1e-3 sec/op
avg latency       : 0.018428 * 1e-3 sec/op
max latency       : 1169.903994 * 1e-3 sec/op
5.0000%  latency  : 0.050065 * 1e-3 sec/op
50.0000%  latency  : 0.500645 * 1e-3 sec/op
95.0000%  latency  : 0.951226 * 1e-3 sec/op
96.0000%  latency  : 0.961239 * 1e-3 sec/op
97.0000%  latency  : 0.971252 * 1e-3 sec/op
98.0000%  latency  : 0.981265 * 1e-3 sec/op
99.0000%  latency  : 0.991278 * 1e-3 sec/op
99.5000%  latency  : 0.996284 * 1e-3 sec/op
99.9000%  latency  : 3.344777 * 1e-3 sec/op
99.9500%  latency  : 7.035031 * 1e-3 sec/op
99.9900%  latency  : 14.644199 * 1e-3 sec/op
avg throughput    :   54264 ops/sec