[db_bench] add filldeterministic (Universal+level compaction)
Summary: in db_bench, we can dynamically create a rocksdb database that guarantees the shape of its LSM. universal + level compaction no fifo compaction no multi db support Test Plan: ./db_bench -benchmarks=fillseqdeterministic -compaction_style=1 -num_levels=3 --disable_auto_compactions -num=1000000 -value_size=1000 ``` ---------------------- LSM --------------------- Level[0]: /000480.sst(size: 35060275 bytes) Level[0]: /000479.sst(size: 70443197 bytes) Level[0]: /000478.sst(size: 141600383 bytes) Level[1]: /000341.sst - /000475.sst(total size: 284726629 bytes) Level[2]: /000071.sst - /000340.sst(total size: 568649806 bytes) fillseqdeterministic : 60.447 micros/op 16543 ops/sec; 16.0 MB/s ``` Reviewers: sdong, andrewkr, IslamAbdelRahman, yhchiang Reviewed By: yhchiang Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D63111
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