[jira] [Created] (CASSANDRA-9468) Improvements to BufferPool

["Benedict (JIRA)" <ji...@apache.org>]

Benedict created CASSANDRA-9468:
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             Summary: Improvements to BufferPool
                 Key: CASSANDRA-9468
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9468
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Benedict
            Assignee: Stefania
            Priority: Minor
             Fix For: 3.x


Following up from CASSANDRA-8897, there are further improvements that can be made to the BufferPool:

# The common code paths can be made non-atomic.
# The chunk pool can be turned into a Stack, instead of a Queue, to improve the likelihood of cache presence
# The chunk pool can be made processor-local, using e.g. [https://github.com/OpenHFT/Java-Thread-Affinity]
# We can support smaller allocations by creating micro-chunks within each local pool, by allocating a single unit from the current chunk (or multiple units if we're about to discard a chunk that is not fully utilised).
#* It should be possible to generalise this approach to make the entire allocation stack tiered, so that whenever you want a new chunk you go to the parent chunk that is an order of magnitude larger, and allocate a small slice (which you convert into a Chunk). Slices below a certain size can be taken exclusive ownership of, and above a certain size they remain shared.



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