[Octave-bug-tracker] [bug #30787] Table lookup performance is really slow

[Jaroslav Hajek]

Update of bug #30787 (project octave):

                Category:                    None => Interpreter            
                Severity:              3 - Normal => 1 - Wish               
              Item Group:                    None => Feature Request        

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Follow-up Comment #1:

There is no newtable() builtin in Octave; besides, I think you guess wrong
where the problem is. A couple of simple measurements suggest that the
function to blame is addtotable(), which is designed to take advantage of
Matlab's matching input/output argument optimization. Octave doesn't have that
optimization, that's why the performance sucks.

Since Octave 3.3.51+ can do the trick for classes, a nice solution would be
to turn the hashtable into a class, and turn on optimize_subsasgn_calls.
Another option is to use a global variable. I've had some ideas how to proceed
to implement the optimization in question for Octave; but right now I lack the
incentive to do so.


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