fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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sdong e6de02103a Add a utility function to guess optimized options based on constraints ... Summary: Add a function GetOptions(), where based on four parameters users give: read/write amplification threshold, memory budget for mem tables and target DB size, it picks up a compaction style and parameters for them. Background threads are not touched yet. One limit of this algorithm: since compression rate and key/value size are hard to predict, it's hard to predict level 0 file size from write buffer size. Simply make 1:1 ratio here. Sample results: https://reviews.facebook.net/P477 Test Plan: Will add some a unit test where some sample scenarios are given and see they pick the results that make sense Reviewers: yhchiang, dhruba, haobo, igor, ljin Reviewed By: ljin Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D18741		11 years ago
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rocksdb	Add a utility function to guess optimized options based on constraints	11 years ago
utilities	Allow user to specify DB path of output file of manual compaction	11 years ago