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[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-

From: Dmitri A. Sergatskov
Subject: [Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices
Date: Thu, 13 Aug 2020 11:01:02 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Follow-up Comment #30, bug #58926 (project octave):

Speaking of benchmarks, on Ryzen i got best results whith openMP
interface and limiting number of threds to the number of CPU cores
(16 in my case):

 OMP_NUM_THREADS=16 LD_PRELOAD=./libopenblas.so octave -q -f
octave:1> ii=1:500;
octave:2> c = sin(ii' + ii.^2);
octave:3> whos c
Variables in the current scope:

   Attr Name        Size                     Bytes  Class
   ==== ====        ====                     =====  ===== 
        c         500x500                  2000000  double

Total is 250000 elements using 2000000 bytes

octave:4> tic; g = eig(c); toc
Elapsed time is 0.118513 seconds.
octave:5> max(real(g))
ans =  16.915



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