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InjectorImpl Performance [message #894827]

Tue, 10 July 2012 12:49

Eclipse User

I am still working to fully understand the DI engine, but as I was reviewing the code I noticed that the class (InjectorImpl) is not declared as final. Is there a reason that it is not declared as final? Wouldn't there be a performance increase if it were because the compiler could "in-line" the code?

[Note to self: read "Java Performance"]

[Updated on: Tue, 10 July 2012 12:55] by Moderator

Re: InjectorImpl Performance [message #894851 is a reply to message #894827]

Tue, 10 July 2012 14:52

Eclipse User

Give it a try and report back Smile

To be honest, I think the bigger win would be to use ASM or something similar and generate the injection code. This is what Guice does and is a big part of its speed.

Brian.

Re: InjectorImpl Performance [message #894853 is a reply to message #894851]

Tue, 10 July 2012 15:17

Eclipse User

Brian-

I'll give it a try, hopefully sometime this weekend I can have results. (Tonight I need to work on the PerspectiveSwitcher!)

Are there any existing performance tests for the framework?
I see the standard unit-tests, but there aren't any performance tests.

The other thing I would be interested in knowing is if the "HotSpot" JVM is doing its job and actually compiling down the bytecode. If methods are too long, the JVM will keep the method as bytecode even if it is a "hot" method. The issue is that longer methods are more difficult for the JVM to understand and optimize (to put it simply). Unfortunately, there is no single definition of a "long" method.

I might need some help in thinking up the logic for any performance tests, if none are presently available. But then I can look at both finalization and compilation of the different methods and see if anything makes a difference.

Re: InjectorImpl Performance [message #894987 is a reply to message #894853]

Wed, 11 July 2012 06:54

Eclipse User

Hooking up JVisualVM to a running instance of Eclipse might help.

Re: InjectorImpl Performance [message #895038 is a reply to message #894987]

Wed, 11 July 2012 09:35

Eclipse User

My thoughts exactly, I was planning on using the profiling tool that is provided. And then I was also going to use the OpenJDK as it offers greater insight into the JIT Compiler.

That really leaves just the test case. Is there any documentation specifying performance benchmarks? See the event broker performance benchmarks as a reference:
http://wiki.eclipse.org/E4/Event_Processing#Eclipse-specific_design_parameters

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