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Vijay commented on CASSANDRA-7438:
----------------------------------
{quote}
This implementation allocates upfront a ring-buffer, after which the entries
are allocated through a regular variant of malloc/free.
{quote}
Not sure what we are talking about, this ==> lurc? if yes the RB is fronting
the queue so we don't need a global lock.
Robert, Thanks!
{quote}
Integration tests should be done on most important platforms like Linux x64,
OSX, Win64
{quote}
Win64 will be awesome if you generate the dll for lruc. please send me the
github username and will add you in.
> Serializing Row cache alternative (Fully off heap)
> --------------------------------------------------
>
> Key: CASSANDRA-7438
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7438
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Environment: Linux
> Reporter: Vijay
> Assignee: Vijay
> Labels: performance
> Fix For: 3.0
>
> Attachments: 0001-CASSANDRA-7438.patch
>
>
> Currently SerializingCache is partially off heap, keys are still stored in
> JVM heap as BB,
> * There is a higher GC costs for a reasonably big cache.
> * Some users have used the row cache efficiently in production for better
> results, but this requires careful tunning.
> * Overhead in Memory for the cache entries are relatively high.
> So the proposal for this ticket is to move the LRU cache logic completely off
> heap and use JNI to interact with cache. We might want to ensure that the new
> implementation match the existing API's (ICache), and the implementation
> needs to have safe memory access, low overhead in memory and less memcpy's
> (As much as possible).
> We might also want to make this cache configurable.
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