Reduced performance in Java 9.0.1 (vs 8u152)

Dawid Weiss dawid.weiss at
Fri Jan 5 07:36:25 UTC 2018

Could be, but we don't use Unsafe (at least not explicitly) and the slowdown
does seem to be present in various bits of software (see [1], for example),
so it seems like something more systematic than a single method call.

Could be a butterfly effect or a combination of different factors like
it was already mentioned.
Interesting nonetheless.


[1] LUCENE-7966; the discussion thread contains execution times and
discussion concerning 9 vs. 8 performance (and nobody seemed to know
how to explain the numbers).

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