[Octave-bug-tracker] [bug #63791] movfun - high intermediate memory use for moderate data input resulting in out of memory errors

[Liang Tang]

Follow-up Comment #21, bug #63791 (project octave):

Thanks.  

My last note meant to illustrate that the input data size reduced by 1/2, from
user's view point, has no effects on the memory requirement.  

I chose moving average for smoothing because results from moving average were
better than filter for my purpose.  Others may find it differently.  It is
application specific.   

The size of the data I use for illustrating issue is not extreme in today's
standard.  Frequency contents of the data and speed of the data accumulation
drastically changed from a while ago. 

The last item is speed.  From about 2017-2018 time frame, I think matlab had
fairly noticeable speed improvement through parallelizing.  Many problems that
used to be solved only on cluster can be solved locally on a 6-8 core laptop
using just 4 workers.  My limited exercise of parallel package did not
demonstrate much benefits. I don't know if it is because I don't know how to
do it right or the implementation is ineffective.   For me, better speed and
graphics are two major want-to-have and they should be part of core.    

 


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