[Octave-bug-tracker] [bug #53140] Solution of a system of linear equations takes forever and hurts OS performance.

[Rik]

Follow-up Comment #39, bug #53140 (project octave):

@Marco: I ran the test 'X = a\b' with linsolve_test.mat 10 times as a
benchmark.  I got the following results


octave:12> [bm0; bm1; bm2]
ans =

   102.389   102.051    99.073    81.978    82.861    83.698    79.992   
79.089    79.394    83.341
    75.471    78.109    78.393    58.081    56.656    56.390    56.522   
56.702    56.574    57.008
    95.194    95.683    96.816   100.142    96.531    96.343    99.811   
99.955    99.713    96.212


bm0 is the original code, bm1 is the addition of the patch to change the
number of iterations to 1, bm2 is the latest patch which changes the guess of
the number of non-zeros, but also changes UMFPACK_ZNAME (solve) to
UMFPACK_ZNAME (wsolve).  The performance is worse.

I would stop where we are, unless you think it is still worthwhile to change
the guess for the initial number of zeros, but keep UMFPACK_ZNAME (solve).


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