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From "Richard Eckart de Castilho (Jira)" <...@uima.apache.org>
Subject [jira] [Created] (UIMA-6136) FSIndexComparatorImpl.equalsWithoutType() gets slow for many CASes with the same TS
Date Mon, 21 Oct 2019 20:57:00 GMT
Richard Eckart de Castilho created UIMA-6136:
------------------------------------------------

             Summary: FSIndexComparatorImpl.equalsWithoutType() gets slow for many CASes with
the same TS
                 Key: UIMA-6136
                 URL: https://issues.apache.org/jira/browse/UIMA-6136
             Project: UIMA
          Issue Type: Bug
          Components: UIMA
    Affects Versions: 3.1.0SDK
            Reporter: Richard Eckart de Castilho
         Attachments: 2019-10-21_22-23-37.png, 2019-10-21_22-44-25.png

When creating several hundred CASes with the same type system, the `shareExisting` mechanism
which is designed to save on memory starts eating into CPU time quite a lot.

This screenshot shows that in my particular case, the method is called ~11mio times and takes
the bulk of the processing time. The call hierarchy is a bit messed up though - actually this
happens when the CASes are initialized.

 !2019-10-21_22-44-25.png! 

The second screenshot shows the actual call hierarchy, but for some reason, the profile doesn't
properly dive into the `equals` method here and doesn't count the time spent in `equalsWithoutType`.

 !2019-10-21_22-23-37.png! 

So either the method shouldn't be called that often - or - it should be way faster.



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