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[jdt-dev] Run As JUnit Test - Create Type Hierarchy performance
  • From: "Milles, Eric (TR Technology)" <eric.milles@xxxxxxxxxxxxxxxxxx>
  • Date: Thu, 28 Apr 2022 22:58:17 +0000
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  • Thread-topic: Run As JUnit Test - Create Type Hierarchy performance

JDT team,

 

Does anyone know of a change from Eclipse 4.8 or 4.9 timeframe that would have stopped packages or compilation units from filling the JavaModelCache (managed by JavaModelManager)?  Is there any reason why after compilation of a source file it should not have its java elements cached in the model?

 

 

I have been investigating slow down in JUnit launch on and off for some time.  There is much more detail in this bug ticket: https://bugs.eclipse.org/bugs/show_bug.cgi?id=540712

 

Long story short, Create Type Hierarchy takes very long (over 216 seconds for one of my projects).  The second time around, it runs in much less time (~18 seconds) due to something being cached by the type hierarchy builder.  In the case of a larger java project, the time to launch just after compilation is over 20 minutes!  And is about 2 minutes for each subsequent launch.

 

I was finally able to see that JavaModelCache is populated with packages, compilation units, etc. (their children).  Something changed between Eclipse Neon (4.7) and Photon (4.9) -- according to the ticket.  I was able to force the population for each compilation unit in AbstractImageBuilder when ClassFiles are accepted and the time went down to match the cached/second run of Run As > JUnit Test.

 

 

I appreciate your time in considering this issue.  And thanks to all who support JDT.

 

Eric Milles

Lead Software Engineer - Thomson Reuters

Member - Eclipse Foundation, Apache Foundation

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