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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-9468) Improvements to BufferPool
Date Fri, 06 Nov 2015 16:42:27 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-9468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-9468:
----------------------------------------
    Assignee:     (was: Stefania)

> Improvements to BufferPool
> --------------------------
>
>                 Key: CASSANDRA-9468
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9468
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Benedict
>            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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