[Octave-bug-tracker] [bug #57321] Performance degradation due to memory allocation

[anonymous]

Follow-up Comment #7, bug #57321 (project octave):

Following up [1] I used "bm.toeplitz"



runs = 1;

cumulate = 0; b = 0;
for i = 1:runs
  b = zeros (620, 620);
  tic;
    for j = 1:620
      for k = 1:620
        b(k,j) = abs (j - k) + 1;
      end
    end
  timing = toc;
  cumulate = cumulate + timing;
end



Instead of compiling Octave I changed libstdc++ to redirect all of its small
sized "malloc" and "free" calls to the memory pool. Also because the
"thread_local" declaration is ,at least in Windows,inefficient I used a
lock-free queue instead of the vector as the internal structure of the memory
pool. The performance gain was 40% relative to Octave without memory pool.

[1] https://savannah.gnu.org/bugs/?56752

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