[Octave-bug-tracker] [bug #61092] Tangible performance degradation on dev between 6th July and 27th of August

[Hendrik K]

URL:
  <https://savannah.gnu.org/bugs/?61092>

                 Summary: Tangible performance degradation on dev between 6th
July and 27th of August
                 Project: GNU Octave
            Submitted by: koerhen
            Submitted on: Tue 31 Aug 2021 06:25:31 AM UTC
                Category: Performance
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: koerhen
        Originator Email: 
             Open/Closed: Open
                 Release: dev
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

I regularly build (every 6-8 weeks) my own images using mercurial dev
repository on my linux box (Ubuntu 20.04.3 LTS AMD Ryzen 9 9300X) and noticed
a tangible (6%-9%) performance degradation between my octave image from the
7th of July and from the 27th of August this year for all octave programs.

Build is Plain vanilla following https://wiki.octave.org/Building

A quick check/test confirmed this:
tic;
for k=1:10
ts(k) = toc();
for i=1:1000000
  j = i * 2;
  j = j .^ 2;
  j = j - 3 * j;
endfor
ts(k) = toc() - ts(k);
endfor
disp (mean(ts));


Image 6th of July: 1.2132s
Image 27th of August: 1.3054s
1.3054/1.2132 = 107.6%.

Note: I had a quick look at the commits occurred between the two dates but
could not identify anything pinpointing to the root of the degradation (I am
not an Octave developer though)




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