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

Haobo Xu f2f4c8072f [RocksDB] Added nano second stopwatch and new perf counters to track block read cost ... Summary: The pupose of this diff is to expose per user-call level precise timing of block read, so that we can answer questions like: a Get() costs me 100ms, is that somehow related to loading blocks from file system, or sth else? We will answer that with EXACTLY how many blocks have been read, how much time was spent on transfering the bytes from os, how much time was spent on checksum verification and how much time was spent on block decompression, just for that one Get. A nano second stopwatch was introduced to track time with higher precision. The cost/precision of the stopwatch is also measured in unit-test. On my dev box, retrieving one time instance costs about 30ns, on average. The deviation of timing results is good enough to track 100ns-1us level events. And the overhead could be safely ignored for 100us level events (10000 instances/s), for example, a viewstate thrift call. Test Plan: perf_context_test, also testing with viewstate shadow traffic. Reviewers: dhruba Reviewed By: dhruba CC: leveldb, xjin Differential Revision: https://reviews.facebook.net/D12351		12 years ago
..
block.cc	Replace include/leveldb with include/rocksdb.	12 years ago
block.h	Replace include/leveldb with include/rocksdb.	12 years ago
block_builder.cc	Replace include/leveldb with include/rocksdb.	12 years ago
block_builder.h	Replace include/leveldb with include/rocksdb.	12 years ago
block_test.cc	Replace include/leveldb with include/rocksdb.	12 years ago
filter_block.cc	Internal/user key bug fix.	12 years ago
filter_block.h	Replace include/leveldb with include/rocksdb.	12 years ago
filter_block_test.cc	Replace include/leveldb with include/rocksdb.	12 years ago
format.cc	[RocksDB] Added nano second stopwatch and new perf counters to track block read cost	12 years ago
format.h	[RocksDB] Added nano second stopwatch and new perf counters to track block read cost	12 years ago
iter_heap.h	Replace include/leveldb with include/rocksdb.	12 years ago
iterator.cc	Replace include/leveldb with include/rocksdb.	12 years ago
iterator_wrapper.h	Codemod NULL to nullptr	12 years ago
merger.cc	Replace include/leveldb with include/rocksdb.	12 years ago
merger.h	A number of fixes:	14 years ago
table.cc	[RocksDB] Added nano second stopwatch and new perf counters to track block read cost	12 years ago
table.h	Introduced a new flag non_blocking_io in ReadOptions.	12 years ago
table_builder.cc	Replace include/leveldb with include/rocksdb.	12 years ago
table_test.cc	Replace include/leveldb with include/rocksdb.	12 years ago
two_level_iterator.cc	[RocksDB] [Performance] Allow different posix advice to be applied to the same table file	12 years ago
two_level_iterator.h	Replace include/leveldb with include/rocksdb.	12 years ago