Status: Accepted
Owner: trond.norbye
Labels: Type-Enhancement Priority-Low Performance
New issue 89 by trond.norbye: "optimize" stats counters for mget
http://code.google.com/p/memcached/issues/detail?id=89
We used to have two counter (one for hits and one for misses) we
incremented when processed the
mget command to avoid locking the global stats mutex all of the times. When
we moved the get
statistics down into the slab classes this got a lot worse, because now we
have an array 201
counters for get hits. Whenever we enter the function we have to zero out
the array, and when we
leave the function we need to iterate through the complete array to update
the counters. In the
latest revision we also use a thread-local statistics structure we
aggregate whenever someone
requests the statistics protected by a threadlocal mutex.
Instead of working on this temporary table we should update the threadlocal
copy instead.
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