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    • Status: Open
    • Minor
    • Resolution: Unresolved
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      Javabin performance can be pretty impactful on search side scatter / gather and especially the /export handler.

      It turns out, in JavaBin, where it does a large switch to dispatch based on the type, its a hot spot that is too large to be inlined.

      You can pull some less common paths out into another method to address this.

      I have not benchmark this yet, and it’s possible other bottlenecks may dampen the win, but I noticed the following on ref branch (with a couple other optimizations that were not nearly as wide affecting or quite as hot):

      When you run the tests, you get the best results in “client” mode - eg you prevent the C2 compiler from kicking in. Let’s say I could run the core nightly tests serially on my laptop in about 8 minutes with C1 - C2 might take another 2 to 3 minutes on top. This is because the work it does optimizing and compiling and uncompiling on such a diverse task ends up being the dominant performance drag.

      With a bit of key optimization here, running the tests with C2 ends up about on par with stopping at C1, even though C2 still dominates everything else.

      That’s a pretty impactful win in order to be able to move the needle like that.

      Why such a win on C2 without C1 also dodging forward? It’s much more manageable to reduce the byte code for a none inlined hot method below the C2 size threshold for inlining than C1s.

      So this should be a decent win i hope. There are a variety of differences that may outweigh it though.

      • javabin on master has tail recursion.
      • generates a tremendous number of byte arrays
      • converts between utf8 and utf16
      • manually does the encoding (the jvm can cheat)
      • Has a number of classes that extend it (vs 1 here)
      • lots of other things

      I’m optimistic we can see some gain though.


        1. javabin.decode.1.before.json
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          Mark Robert Miller
        2. javabin.decode.2.after.json
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        4. javabin.decode.before.and.after.summary.png
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        6. javabin.encode.before.and.after.summary.png
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        8. javabin.encode.decode.summary.png
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          Mark Robert Miller

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