Re: [Octave 5.2.0 @ Ubuntu 20.04] Long duration of complex matrix inverse

[sshah]

On Ubuntu 18.04, for Octave 5.2.0 built from source using libblas-dev, you
can switch to openblas without rebuilding it.

On my AWS c5.4xlarge instance, 

>> sudo apt-get install libopenblas-base 

Reading package lists... Done
...
Setting up libopenblas-base:amd64 (0.2.20+ds-4) ...
update-alternatives: using /usr/lib/x86_64-linux-gnu/openblas/libblas.so.3
to provide /usr/lib/x86_64-linux-gnu/libblas.so.3
(libblas.so.3-x86_64-linux-gnu) in auto mode
update-alternatives: using /usr/lib/x86_64-linux-gnu/openblas/liblapack.so.3
to provide /usr/lib/x86_64-linux-gnu/liblapack.so.3
(liblapack.so.3-x86_64-linux-gnu) in auto mode
Processing triggers for libc-bin (2.27-3ubuntu1) ...


octave:8> a=randn(n)+i*randn(n);
octave:9> tic;lu(a);toc
Elapsed time is 1.25847 seconds.

Maximum CPU usage reported in top is 1600% (all 16 cores).




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