[Octave-bug-tracker] [bug #49166] "system.tst" fails under Windows

[Hartmut]

Follow-up Comment #2, bug #49166 (project octave):

Here is an easier way to maybe reproduce this behavior. 

The following script basically does "test system.tst" in a loop. It NEVER
makes it to the end on my Win-7 machine with Octave-4.2.0-rc2. But this very
same script ALWAYS finishes just fine on the same PC, if I use the
Octave-4.0.3 release instead.


more off
cd "C:/Octave/Octave-4.2.0-rc2/share/octave/4.2.0-rc2/etc/tests/fixed"
for t = 1:200
  disp("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");
  disp(num2str(t));
  disp("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX");

  #result = test("system.tst", "verbose");
  #if (result != true)
  #  disp("BUG OCCURED!");
  #  break
  #endif
  #disp("Test PASSED");

  ### use code from test directly, to speed things up:
  [t1, u1, s1] = cputime ();
  for i = 1:200
    sin (i);
  endfor
  [t2, u2, s2] = cputime ();
  assert (t1, u1 + s1);
  assert (t2 == u2 + s2);
  assert (t2 >= t1);
  assert (u2 >= u2);
  assert (s2 >= s2);
endfor


I have observed the following discrepancies on my PC so far (observed time,
absolute error):
* 13.1105 , 1.7764e-15
* 25.4753 , 3.5527e-15
* (some others as well)


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