mailing-list for TeXmacs Users

[Sebastian Miele <address@hidden>]

Massimiliano Gubinelli <address@hidden> writes:

> Maybe, something is going wrong in your runloop. If you look into
> Plusings/Qt/qt_gui.cpp you see that we use a QTimer to fire an update
> procedure which runs TeXmacs internal update routines (reading input
> events from a secondary queue, performing changes and updating the
> window graphic surfaces). Maybe something is changed in the version of
> Qt5 which you have and this makes this bug appear, it does not seems
> to me I have seen it on my Mac (with Qt4). If you want to try to debug
> you can see wether the update function is run too often and why.
> Usually the algorithm make sure that, unless there is input to handle,
> the update function is called with reasonable timeout (there are
> delayed events which are produced internally in TeXMacs which have to
> be handled anyway, like the update of the footer bar).

I do not want to start diving into the C++ source code at this point in
my TeXmacs learning curve. It probably will take several months until I
want to do that.

However, I ran gprof on a TeXmacs compiled via:

  CFLAGS='-march=silvermont -mtune=silvermont -pg'      \
  CXXFLAGS='-march=silvermont -mtune=silvermont -pg'    \
  cmake ../0                                            \
        -GNinja                                         \
        -DCMAKE_BUILD_TYPE=Release                      \
        -DCMAKE_INSTALL_PREFIX=/opt/texmacs/0-gprof     \
        -DGUILECONFIG_EXECUTABLE=/usr/bin/guile-config1.8

I ran TeXmacs for more than two hours. The 100% CPU issue was present
nearly all of that time. The outputs of 'gprof --flat-profile ...' and
'gprof --graph ...' are:

  
https://drive.google.com/file/d/1zuNvh5xxBXivvr6JOOmONBV0UCW_ymjW/view?usp=sharing
  
https://drive.google.com/file/d/1dnQr6RU4TXbZ8KymtJ3NeRXQke9fIJIi/view?usp=sharing

The beginning of the latter is:

  granularity: each sample hit covers 2 byte(s) for 0.00% of 1069.17 seconds

  index % time    self  children    called     name
                                                   <spontaneous>
  [1]     97.9    0.07 1046.15                 QTMGuiHelper::doUpdate() [1]
                  0.13 1046.02  826744/826745      qt_gui_rep::update() [2]
  -----------------------------------------------
                  0.00    0.00       1/826745      qt_gui_rep::event_loop() 
[1705]
                  0.13 1046.02  826744/826745      QTMGuiHelper::doUpdate() 
[1]
  [2]     97.8    0.13 1046.03  826745         qt_gui_rep::update() [2]
                  0.67 1040.20  826909/826909      
tm_server_rep::interpose_handler() [3]
                  0.66    3.57  826909/826909      
qt_simple_widget_rep::repaint_all() [82]
                  0.05    0.32    1712/1712        
qt_gui_rep::process_queued_events(int) [216]
                  0.13    0.08  826909/826909      sync_databases() [282]
                  0.14    0.00  826909/826909      
texmacs_interpose_handler() [371]
                  0.13    0.00 2480734/8301127     texmacs_time() [196]
                  0.04    0.00 2484051/2484051     event_queue::size() const 
[629]
                  0.03    0.00  826912/826912      
command_queue::must_wait(long) const [710]
                  0.00    0.00     463/463         
qt_gui_rep::process_delayed_commands() [2941]
  -----------------------------------------------
                  0.67 1040.20  826909/826909      qt_gui_rep::update() [2]
  [3]     97.4    0.67 1040.20  826909         
tm_server_rep::interpose_handler() [3]
                  0.26 1039.31 1653517/1653517     
edit_interface_rep::apply_changes() [4]
                  0.12    0.11  826909/826909      process_all_pipes() [270]
                  0.09    0.07  826909/826913      windows_refresh(string) 
[336]
                  0.05    0.09 1653517/1653517     virtual thunk to 
edit_interface_rep::animate() [369]
                  0.02    0.06  826909/985568419     string::string(char 
const*) [26]
                  0.01    0.00  826909/1696524345     fast_free(void*, 
unsigned long) [51]
                  0.01    0.00  826909/5143892594     fast_delete(void*) [33]