[Octave-bug-tracker] [bug #58445] significant slow down in stable version for cellfun invocations which use function handles

[Dmitri A. Sergatskov]

Follow-up Comment #15, bug#58445 (group octave):

Splitting this example into bm1.m (@numel loop only) and bm2.m
("numel" loop only). Also increased N to 1e6.

octave:1> profile on
octave:2> bm1
Time for cellfun (@numel, C) : 11.454379
octave:3> profile off
octave:4> profshow 
   #  Function Attr     Time (s)   Time (%)        Calls
--------------------------------------------------------
  26   cellfun             7.104      64.97      1000000
   1       bm1             3.059      27.97            1
  27     numel             0.771       7.05      4000000
   2     magic    R        0.000       0.00            5
  17    fliplr             0.000       0.00            2


octave:1> profile on
octave:2> bm2
Time for cellfun ("numel", C) : 3.036819
octave:3> profile off
octave:4> profshow
   #  Function Attr     Time (s)   Time (%)        Calls
--------------------------------------------------------
   1       bm2             2.324      79.13            1
  26   cellfun             0.612      20.85      1000000
   2     magic    R        0.000       0.01            5
  17    fliplr             0.000       0.01            2

(where are the numel calls?)

Also attached are uProf screenshots (bm1_uprof.png and bm2_uprof.png for each
run.

Dmitri.
-- 


(file #55633, file #55634)

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Additional Item Attachment:

File name: bm1_uprof.png                  Size:121 KB
    <https://file.savannah.gnu.org/file/bm1_uprof.png?file_id=55633>

File name: bm2_uprof.png                  Size:123 KB
    <https://file.savannah.gnu.org/file/bm2_uprof.png?file_id=55634>


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