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[Octave-bug-tracker] [bug #53140] Solution of a system of linear equatio


From: Marco Caliari
Subject: [Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.
Date: Tue, 27 Feb 2018 03:14:21 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0

Follow-up Comment #21, bug #53140 (project octave):

I see something strange (to me): if I declare


OCTAVE_LOCAL_BUFFER (double, Bx, b_nr);
OCTAVE_LOCAL_BUFFER (double, Xx, b_nr);
OCTAVE_LOCAL_BUFFER (double, W, b_nr);
OCTAVE_LOCAL_BUFFER (octave_idx_type, Wi, b_nr);


I do not see any improvement. On the other hand, with


OCTAVE_LOCAL_BUFFER (double, Bx, b_nr);
OCTAVE_LOCAL_BUFFER (double, W, b_nr);
OCTAVE_LOCAL_BUFFER (octave_idx_type, Wi, b_nr);
OCTAVE_LOCAL_BUFFER (double, Xx, b_nr);


I see the reduction from about 55 seconds to 40. Does it make sense?

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