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I wrote a post on how to measure perf impact and pitfalls of THP some time ago. I hope it helps https://alexandrnikitin.github.io/blog/transparent-hugepages...

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Have you tried turning off THP and just using -XX:+UseLargePages? It always seems to do same-or-better for me and I don't have to worry about some other process accidentally stealing my (precious) huge pages.

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