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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