Increasing Performance with OpenJ9 GC Tuning - a guide

• OpenJ9

  7 3,215 9.9 Java

  Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.

  

-Xjit:disableGuardedStaticFinalFieldFoldingFlat out improves performance, working around a bug in -XaggressiveEnables performance optimizations and new platform exploitation that are expected to be the default in future releases of OpenJ9. -Xmns128M -Xmnx1024MSets minimum and maximum size of the nursery for the gencon (default) GC. Having a small nursery allows garbage collection to be really fast, especially with how many short lived objects Minecraft makes. These values shouldn't need to be changed.If you want to know more about the gencon GC and its nursery and tenure zones you can find something here. -XdisableexplicitgcDoesn't allow mods to force a full garbage collection. Removes some lagspikes from misbehaving mods. -Xgc:concurrentScavengeLets gencon GC collect garbage in the background, without stopping the game thread to do it. Gives a very noticeable boost to "smoothness". -Xgc:dnssExpectedTimeRatioMaximum=95 -Xgc:dnssExpectedTimeRatioMinimum=70Lets gencon GC know that it's gotta spend most of its time cleaning up the nursery, instead of the rest of the heap. Most of the garbage is in the nursery instead of the tenure zone so this works incredibly well on modded MC.

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