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  1. ROOT
  2. ROOT-7840

large pyroot performance regression in 6.04.10

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      hi -

      I've observed that some calls to C++ from python take 5--10x longer
      with root 6.04.10 compared to root 6.02.08. (However, the 6.06
      release is much faster than 6.02.08, so this is an issue only
      for the 6.04. branch.)

      A simple reproducer is attached: it generates a dictionary for a trivial
      class method and then calls it multiple times. Execute one of the setup
      scripts (such as setup-602, setup-604), then execute the testit script
      to build and run the example.

      On lxplus, i find that the loop takes about 5 seconds with root 6.02.08
      and about 30 seconds with root 6.04.10. (But with root 6.06, it takes
      about 1 second.)

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            axel Axel Naumann
            ssnyder Scott Snyder
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