jkesselm commented on PR #113:
URL: https://github.com/apache/xalan-java/pull/113#issuecomment-1808291701

   Interesting question. Ideally all fixed should be accompanied by some form 
of before-and-after test. Sometimes that winds up being a human probing it and 
vouching for it. 
   
   I'm not aware of an automated memory-leakage metric, though that info can be 
gotten from core dumps so there is _probably_ a way to probe it through the 
debugging APIs. If you happen to know of a trustworthy implementation that 
could be used from a regression test, I'd appreciate a pointer. If not, that 
might be an interesting little R&D project for someone; meanwhile human 
attestation may be the best available. 
   
   We have a performance suite in our test set, though again that's hard to do 
reliably without a human in the loop. Especially in hotspot JIT compilers, 
which can optimize differently every run. Again, specific proposals for 
reliable automatable metrics that we could add to our toolkit are welcome, or 
we can rely on humans. By inspection, the change appears unlikely to be costly; 
it's just nulling one field. 
   


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