sam.saffron / gmail.com wrote:
> As much as we like to think of jemalloc as a silver bullet of
> sorts... there are problems... In particular if you have THP
> enabled which most people do out of the box its behavior is
> not ideal despite all the fixes it has gotten over the years.
> My observation is that both MALLOC_ARENA_MAX=2 and tcmalloc
> can perform better if THP is on, both in 5.1 and 3.6.0.
> Getting the world to turn off THP is a hard job. 

Ruby 2.6 will disable THP, at least:

   https://bugs.ruby-lang.org/issues/14705

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