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

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Dhruba Borthakur ad96563b79 Ability to configure bufferedio-reads, filesystem-readaheads and mmap-read-write per database. ... Summary: This patch allows an application to specify whether to use bufferedio, reads-via-mmaps and writes-via-mmaps per database. Earlier, there was a global static variable that was used to configure this functionality. The default setting remains the same (and is backward compatible): 1. use bufferedio 2. do not use mmaps for reads 3. use mmap for writes 4. use readaheads for reads needed for compaction I also added a parameter to db_bench to be able to explicitly specify whether to do readaheads for compactions or not. Test Plan: make check Reviewers: sheki, heyongqiang, MarkCallaghan Reviewed By: sheki CC: leveldb Differential Revision: https://reviews.facebook.net/D9429		12 years ago
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memenv	Ability to configure bufferedio-reads, filesystem-readaheads and mmap-read-write per database.	12 years ago