Daniel Spiewak djspiewak

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   # Quick Tips for Fast Code on the JVM

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   I was talking to a coworker recently about general techniques that almost always form the core of any effort to write very fast, down-to-the-metal hot path code on the JVM, and they pointed out that there really isn't a particularly good place to go for this information.  It occurred to me that, really, I had more or less picked up all of it by word of mouth and experience, and there just aren't any good reference sources on the topic.  So… here's my word of mouth.

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   This is by no means a comprehensive gist.  It's also important to understand that the techniques that I outline in here are not 100% absolute either.  Performance on the JVM is an incredibly complicated subject, and while there are rules that almost always hold true, the "almost" remains very salient.  Also, for many or even most applications, there will be other techniques that I'm not mentioning which will have a greater impact.  JMH, Java Flight Recorder, and a good profiler are your very best friend!  Measure, measure, measure.  Then measure again.

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   # Thread Pools

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   Thread pools on the JVM should usually be divided into the following three categories:

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   1. CPU-bound

3. A parser combinator library based on the GLL algorithm

   Scala 313 26

4. shims shims Public archive

   Seamless interop layer between cats and scalaz

   Scala 173 15

5. An sbt plugin which makes it easier to build with GitHub Actions

   Scala 199 65

6. The pure asynchronous runtime for Scala

   Scala 2.2k 578