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[Octave-bug-tracker] [bug #56752] Performance slowdown from version 3.2.

From: John W. Eaton
Subject: [Octave-bug-tracker] [bug #56752] Performance slowdown from version 3.2.4 through to current dev branch
Date: Fri, 16 Aug 2019 11:47:25 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

Follow-up Comment #17, bug #56752 (project octave):

With the version of octave_value_list that uses std::vector I see the
following change when running the tests.  To make the timing a bit more
meaningful, I timed the run-octave command that runs the tests, not "make

With octave_value_list using Array:

  503.05 user 101.32 system 9:19.31 elapsed 108% CPU

With octave_value_list using std::vector:

  488.47 user 95.40 system 9:03.85 elapsed 107% CPU

I also see that the string_vector object that we use to attach names to
octave_value_list objects is based on Array.  I'll experiment with changing
that as well, or seeing whether we can remove that feature from the
octave_value_list object since there are probably only a few places where
names are needed.  Maybe with the current structure of the
interpreter/evaluator we don't need to attach names to octave_value_list


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