Re: Odd lag on a Shell command

[Benoît Minisini <benoit.minisini@xxxxxxxxxxxxxxxx>]

Le 13/08/2024 à 11:43, Bruce Steers a écrit :
> I'm making a project to list all my VBox VMs and let me mount the drives.
>
> It has a strange issue though.
>
> It uses the following shell command...
> vboximg-mount -lv
>
> wen i run that in a terminal the output happens very fast.
>
> When running via gambas Shell or Exec it's taking 5.2 seconds
>    Exec ["vboximg-mount", "-l", "-v"] To sRes
>
> But i'll say "usually" some days it seems to load with speed other days 
> it's slow.
>
> I have no idea what causes the command to run fast or slow it just 
> changes as i modify other parts of the project.
>
> Any ideas why it seems to run the command so slow?
>
> Many thanks
> BruceS

During the 5 seconds, you can run 'top' to see if CPU time is spent 
either in 'vboximg-mount' or in Gambas.

You can use 'sudo gdb vboximg-mount <pid>' to stops the 'vboximg-mount' 
process inside gdb and see what it does. Same thing with 'sudo gdb gbr3 
<pid>' to stop the Gambas process.

If the Gambas parent process has a GUI, you can try to switch between Qt 
and GTK+ to see if it makes a difference.

The GTK+ component has to implement specific workarounds when managing 
child processes, because of a bad design bug in the underlying 'glib' 
library.

--
Benoît Minisini.