[Octave-bug-tracker] [bug #48085] Slow solving simultaneous equations by LU decomposition for octave 4 on windows

[Tatsuro MATSUOKA]

Follow-up Comment #16, bug #48085 (project octave):


I have executed the same script on Ubunu 14.04 LTS amd64
(Athlon X2 (old))
All versions are built from source using the same libraries.

3.8.2

Simple left division
Elapsed time is 27.0865 seconds.
LU decomposition
c=P*B
Elapsed time is 0.09763 seconds.
y=L\c
Elapsed time is 9.60967 seconds.
x=U\y
Elapsed time is 9.72021 seconds.



4.0.2

Simple left division
Elapsed time is 26.9563 seconds.
LU decomposition
c=P*B
Elapsed time is 0.107472 seconds.
y=L\c
Elapsed time is 9.70008 seconds.
x=U\y
Elapsed time is 9.71262 seconds.



4.1.0+

Simple left division
Elapsed time is 26.8803 seconds.
LU decomposition
c=P*B
Elapsed time is 0.092479 seconds.
y=L\c
Elapsed time is 9.71794 seconds.
x=U\y
Elapsed time is 9.85034 seconds.


On linux results are essentially the same for 3.8.2, 4.0.2 and 4.1.0+.

Now issue is narrowed to 4.1.0+ on windows.

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