Update HISTORY.md for thread-local stats

Summary: as titled

Test Plan: doitlive

Reviewers: sdong, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D63777
This commit is contained in:
Andrew Kryczka 2016-09-08 14:02:19 -07:00
parent 0fcb6dbed7
commit de28a25533

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### New Features
* Introduce NewClockCache, which is based on CLOCK algorithm with better concurrent performance in some cases. It can be used to replace the default LRU-based block cache and table cache. To use it, RocksDB need to be linked with TBB lib.
* Change ticker/histogram statistics implementations to accumulate data in thread-local storage, which improves CPU performance by reducing cache coherency costs. Callers of CreateDBStatistics do not need to change anything to use this feature.
## 4.11.0 (8/1/2016)
### Public API Change