Abhishek Kona fe10200ddc Introduce histogram in statistics.h ...

Summary:
* Introduce is histogram in statistics.h
* stop watch to measure time.
* introduce two timers as a poc.
Replaced NULL with nullptr to fight some lint errors
Should be useful for google.

Test Plan:
ran db_bench and check stats.
make all check

Reviewers: dhruba, heyongqiang

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D8637

2013-02-20 10:43:32 -08:00

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leveldb

Introduce histogram in statistics.h

2013-02-20 10:43:32 -08:00