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

[Rik]

Update of bug #61092 (project octave):

                  Status:               Need Info => Works For Me           

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Follow-up Comment #4:

I can't reproduce this.  I used the attached script bm_61092.m shown below.


N = 100;  # number of trials (> 50 for Central Limit Theorem to apply)

bm = zeros (N, 1);   # pre-declare benchmark data array

## Run one inner loop to engage CPU frequency scaling
for i = 1:1e5
  x = i * 2;
  x = x .^ 2;
  x = x - 3 * x;
endfor

## Run benchmark
for j = 1:N
  tic ();
  for i = 1:1e5
    x = i * 2;
    x = x .^ 2;
    x = x - 3 * x;
  endfor
  bm(j) = toc ();
endfor

disp (mean (bm));
disp (std (bm));


Results are 


DEV : 9/2/21
mean = .177
std  = .009
-----------------------------------------------------------------
STABLE : 6.3.0
mean = .19
std  = .01
-----------------------------------------------------------------
DEV : 7/6/21
mean = .18
std  = .01


For 7/6/21 the actual changeset ID was 29857:0b01806bb663.

(file #51864)
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Additional Item Attachment:

File name: bm_61092.m                     Size:0 KB
    <https://file.savannah.gnu.org/file/bm_61092.m?file_id=51864>



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