kimmking commented on PR #3657:
URL: https://github.com/apache/rocketmq/pull/3657#issuecomment-1455083836

   As another effect, we found after upgrade to 4.9.4, mmap avoid many swap 
usage rather than older version with fileChannel.
   See 
https://stackoverflow.com/questions/49996217/filechannel-vs-mappedbytebuffer-in-random-access


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