[Octave-bug-tracker] [bug #59331] Processor load stays up after `__run_test_suite__`

[Markus Mützel]

URL:
  <https://savannah.gnu.org/bugs/?59331>

                 Summary: Processor load stays up after `__run_test_suite__`
                 Project: GNU Octave
            Submitted by: mmuetzel
            Submitted on: Sat 24 Oct 2020 02:37:20 PM CEST
                Category: GUI
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Performance
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 6.0.92
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

After running the test suite with `__run_test_suite__` with Octave 6.0.92 on
Windows 10, one of the processor cores stays at full load. At that point,
Octave's interface is very slow to respond on any interaction (with mouse or
keyboard).

I attached a profiler (Very Sleepy) to Octave while in this state and profiled
the thread with the high load for approximately 3 minutes. Attached is the
exported stack that produced the highest load (approx. 90% of total) during
this time period.

Symbols are mangled. But if I'm reading this correctly, it is the GUI thread
that seems to be hanging.

It seems to hang indefinitely. Even after about 20 minutes without interacting
with Octave, the CPU load is still up.

Looking on the disc drive activity, it looks like lots of files named
"%APPDATA%\octave\octave-gui.ini.ABCDEF" (where ABCDEF is six random letters)
are written and discarded immediately in a loop.

This was with a fresh installation of Octave immediately with the instance
that was opened by the installer.



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File Attachments:


-------------------------------------------------------
Date: Sat 24 Oct 2020 02:37:20 PM CEST  Name:
Octave_6.0.92_after_run_test_suite.csv  Size: 4KiB   By: mmuetzel

<http://savannah.gnu.org/bugs/download.php?file_id=50086>

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