[Octave-bug-tracker] [bug #45890] Sparse A*x and A+B are a bit slow

[Dmitri A. Sergatskov]

Follow-up Comment #17, bug #45890 (project octave):

Here is "official" benchmark:


----------------------------------------------------------------------
GNU Octave Version: 4.4.1 (hg id: 8800e167c665)
GNU Octave License: GNU General Public License
Operating System: Linux 4.17.12-200.fc28.x86_64 #1 SMP Fri Aug 3 15:01:13 UTC
2018 x86_64
----------------------------------------------------------------------
no packages installed.

N=1000000 NNZ=20000000 NRUNS=5
 sparse: 3.138651 (0.007312)
 2*A   : 0.307419 (0.005336)
 A'    : 2.439559 (0.001288)
 A+B   : 0.845855 (0.001971)
 A*x   : 0.389937 (0.002420)
 A'*x  : 2.844413 (0.004723)


for a reference, a simple test:


octave:1> a=randn(4000);
octave:2> tic; inv(a)*a; toc
Elapsed time is 7.02823 seconds.


(Openblas, 4-threads)

Dmitri.
-- 


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