Re:Kotlin's hidden costs – Benchmarks
by jorgemf on Tuesday July 04, 2017 @09:37PM
(#14699466)
If I recall correctly kotlin by default compiles to bytecode of Java 1.6. So o be afair comparison you should enable kotlin to compile to 1.8. as it is bytecode anyway I would expect very similar performance. But comparing 1.6 with 1.8 it is obvious 1.6 would be slower.
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The bytecode differences between 1.6 and 1.8 bytecodes are mainly invokedynamic and methodhandles.
If Kotlin doesn't take advantage of them when targeting 1.8, the bytecode version won't do any difference.
My point is that kotlin by default targets 1.6. You need to specify to target 1.8 if you want to use it. So for me the experiment is broken. You should either compare java 1.6 with kotlin or set up kotlin to use 1.8 to compare with the same java version.