Quick look at JavaFX methods above the HotSpot inlining threshold

Richard Bair richard.bair at oracle.com
Tue Nov 4 00:27:21 UTC 2014

Hi Chris,

I’ve not seen any experiments or investigation along these lines, looking forward to what you find!


> On Nov 3, 2014, at 3:42 PM, Chris Newland <cnewland at chrisnewland.com> wrote:
> Hi all,
> As part of the JITWatch[1] project I've written a tool called JarScan
> which counts the bytecode size of methods in a jar and logs those methods
> which are above HotSpot's 325 byte size threshold for inlining methods it
> determines are "hot".
> In jfxrt.jar from Oracle's JDK 1.8.0_25 on Linux x86_64 there are 774
> methods above the threshold which I've listed in this gist:
> https://gist.github.com/chriswhocodes/c474e49f0d111757dbf2
> A lot of these won't be found in hot code but perhaps the methods under
> com.sun.javafx.geom and javafx.scene.transform could be candidates for
> examination with JIT compilation in mind?
> Has anybody on the list done any experiments in this area? If not I'll try
> and find some time to see if there are any gains to be made by trimming
> methods (in the OpenJFX source) to fit inside the inlining threshold.
> Cheers,
> Chris
> @chriswhocodes
> [1] https://github.com/AdoptOpenJDK/jitwatch

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