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  1. JDK
  2. JDK-8124985

8.0-graphics-scrum-h276: 33% regression in NodeMemory.TableColumn-rendering-on benchmark

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      There is following regression in build 8.0-graphics-scrum-h276:
       NodeMemory.TableColumn-rendering-on: -33%, 1,620 objects => 1,080 objects

      According to MemoryAnalyzer the number of TableColumnHeader objects is created in twice bigger than
      the number of TableColumn objects. I.e. for each TableColumn object 2 TableColumnHeader objects are created.

      It looks like the regression was actually introduced in build 8.0-graphics-scrum-h275 (which was failed).
      According to hudson it contains:
          1. merge — Martin Sladecek / detail
          2. RT-25363 Try to optimize memory footprint and performance of ListChangeBuilder — Martin Sladecek / detail
          3. merge — Martin Sladecek / detail
          4. RT-9383 Add proper constructors & factory methods to event classes, remove impl — Martin Sladecek / detail
          5. merge — Martin Sladecek / detail
          6. RT-9383 Add proper constructors & factory methods to event classes, remove impl — Martin Sladecek / detail


      The regression is easy reproduced. Steps to run the benchmark:
       > cd JFX_WS/tests/performance/NodeMemory/
       > ant
       > java -client -Xms64m -Xmx64m
             -cp "JFX_HOME/rt/lib/jfxrt.jar;./dist/NodeMemory.jar;../FXBenchmark/dist/FXBenchmark.jar;../../../import/benchmarks-2.1.1/benchmarks-2.1.1.jar"
             jrockit.bm.Main nodememory.bm.TableColumnBenchmark -i 1 -tr 120 -wt 0 -render true -allocCnt 10



      This memory leak is most probably is the reason of Controls.Buttons regression which
      also appeared in build 8.0-graphics-scrum-h276.

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            msladecek Martin Sládeček
            epavlova Ekaterina Pavlova
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