franz1981 commented on issue #2494: ARTEMIS-2224 Reduce contention on LivePageCacheImpl URL: https://github.com/apache/activemq-artemis/pull/2494#issuecomment-454338688 > @franz1981 thx for recommending this tool, much easier to use than jfr! I was sure you would have like it: is indeed "pragmatically better" for devs IMHO: just remember to enable debug non safepoints, but with JFR is the same, reading their docs! @qihongxu > At the end of test the perf boosted to 30k tps The current implementation (lock-free) of the live page cache suffer of the same performance limitation of a `LinkedList`: queries at the beginning and at the end of the list are faster ie `O(1)`, while in the middle are slower ie `O(n)`. To make things faster we need to exploit a better access pattern and provide a cursor-like implementation on it to be used on `QueueImpl::depage`: it should improve things at the point of having ~`O(1)` `getMessage` cost if the cursor will be used with a sequential access pattern, like an iterator. If you like the idea and it really seems to be important I can provide an implementaion for it ie 900M of page size and very small messages are not such a common use case TBH
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