[Octave-bug-tracker] [bug #63015] sparse disables openblas threading

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?63015>

                 Summary: sparse disables openblas threading
                 Project: GNU Octave
               Submitter: None
               Submitted: Sun 04 Sep 2022 09:49:32 PM UTC
                Category: Performance
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 7.2.0
         Discussion Lock: Any
        Operating System: GNU/Linux


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Follow-up Comments:


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Date: Sun 04 Sep 2022 09:49:32 PM UTC By: Anonymous

A = zeros (25e3, 25e3);
A(randi (numel(A), 1, 5e4)) = 1;
B = sparse (A);

tic
R = A^29;
toc

tic
S = B^29;
toc


A^29 uses all the cores available to OpenBlas.

B^29 disables that and uses only one core, so it takes (number of cores) as
long to do it.

Can sparse not disable OpenBlas threading?







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