IPython profile magic _sometime_ records extra time on the main thread.

[Carreau]

Mostly this create deep hard to read report as def _trim_stem trimms nothing:

35.438 MainThread  <thread>:139648662820672
`- 35.437 <module>  ../../../../../../bin/ipython:1
   `- 35.437 start_ipython  IPython/__init__.py:104
      `- 35.437 TerminalIPythonApp.launch_instance  traitlets/config/application.py:1069
         `- 35.437 TerminalIPythonApp.start  IPython/terminal/ipapp.py:320
            `- 35.437 TerminalInteractiveShell.mainloop  IPython/terminal/interactiveshell.py:906
               `- 35.437 TerminalInteractiveShell.interact  IPython/terminal/interactiveshell.py:890
                  `- 35.437 TerminalInteractiveShell.run_cell  IPython/core/interactiveshell.py:3083
                     `- 35.437 TerminalInteractiveShell._run_cell  IPython/core/interactiveshell.py:3125
                        `- 35.437 _pseudo_sync_runner  IPython/core/async_helpers.py:120
                           `- 35.437 TerminalInteractiveShell.run_cell_async  IPython/core/interactiveshell.py:3224
                              `- 35.437 TerminalInteractiveShell.run_ast_nodes  IPython/core/interactiveshell.py:3459
                                 `- 35.437 <module>  <ipython-input-3-70d0375aba7c>:1
                                    `- 35.437 TerminalInteractiveShell.run_line_magic  IPython/core/interactiveshell.py:2443
                                       `- 35.437 PyinstrumentMagic.pyinstrument  pyinstrument/magic/magic.py:44
                                          `- 35.437 TerminalInteractiveShell.run_cell  IPython/core/interactiveshell.py:3083
...

I can't investigate why, as I do not have access to the code that does this, only reports.

The only thing I can suggest is to elide in the middle and re-root PyinstrumentMagic.pyinstrument to be a direct child of the main thread, or if there another option to hide frames globally instead of fixing every renderers ?

Alternatively if you have any idea why the Mainthread registers more time...

[joerick]

my guess is that there's a frame somewhere that has been removed by a processor. Can you print the profile with show_all=True? e.g. ConsoleRenderer(show_all=True).render(session)