franz1981 commented on issue #2633: ARTEMIS-2317 Avoid long TTSP caused by Page::read using mmap read URL: https://github.com/apache/activemq-artemis/pull/2633#issuecomment-487509450 @clebertsuconic @wy96f @qihongxu I'm aware that this patch introduce a (small) perf regression in some cases (due to the added unecessary copy), but I don't know ATM any other ways to avoid the long TTSP issues: a "simple" (bust costy in term of dev/test time) way to improve the situation would be to expose a JNA `mlock` call to allow *at least* that while reading a OS page the OS will swap out randomly OS pages due to other threads interacting with the OS page cache eg the MAPPED journal, that tends to reuse the same files, if compaction is working as expected. It won't solve the TTSP issue, but it would improve the situation on busy servers, leaving just major/minor page faults to be the other causes for long TTSP.
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