[Octave-bug-tracker] [bug #56752] Performance slowdown from version 3.2.4 through to current dev branch

[Rik]

URL:
  <https://savannah.gnu.org/bugs/?56752>

                 Summary: Performance slowdown from version 3.2.4  through to
current dev branch
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Mon 12 Aug 2019 08:35:53 AM PDT
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: Confirmed
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

There has been a significant slowdown in interpreter performance from version
3.2.4 up to the current day (dev branch that will become 6.1.0 release).

Base testing was done with bm.toeplitz.orig.m script quoted below and
attached.


runs = 5;

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

## Total time
cumulate


On the same hardware, running 'octave -f --no-gui' in order to minimize
differences due to my local configuration, I recorded the following running
times.


Version                 3.2.4   3.4.3   3.6.4   3.8.2   4.0.3   4.2.1   4.4.1   
5.1.0   dev
(6.1.0)
Benchmark                                                                       
bm.toeplitz.orig.m      5.8968                          10.055  10.544  13.052  
13.481  13.291


As can be seen, over 100% slow down in interpreter from 3.2.4 to dev.





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File Attachments:


-------------------------------------------------------
Date: Mon 12 Aug 2019 08:35:53 AM PDT  Name: bm.toeplitz.orig.m  Size: 244B  
By: rik5

<http://savannah.gnu.org/bugs/download.php?file_id=47329>

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