Next Freerunner toys - battery applet and runit

30 January 2009, 21:18 UTC

Two more toys that I play with on my Freerunner have just been pushed into git://neil.brown.name/freerunner aka http://neil.brown.name/git/freerunner.

The first is a simply battery monitoring applet. There are plenty of these around and mine adds nothing of real value, except that it is stand-alone and looks the way I want it to look.

It is partly based on the applet in Openmoko Panel Plugin and uses the images for battery status from there. The code (and bugs) are mine though.

The other is a little toy with the creative name of "runit". It will run whatever program it is given and display the output in a window with a button to re-run and another to close the window.

I currently use this for configuring the network (until I get a proper tool for that) and running informational commands like "hcitool scan". It allows me to make important functionality available quickly, while waiting for a more comprehensive tool to be written.

These tools show a significant part of my philosophy which is to create simple stand-alone tools what do what I want, rather the complex frameworks.

One possible problem with this is memory usage. Each python program seems to use up about 5Meg of memory that is resident and not shared. When you only have 128M, that limits you to around 20 such programs at a time. And that doesn't even allow for the kernel.

While I may not want to have 20 running at a time, I am still concerned about the memory wastage. I may end up arranging that python programs are imported rather than executed in a separate process. Python has quite nice namespace control which should make this quite managable, and the gtk.main loop makes is easy to run multiple gtk applications in the one process ... just as long as none of them do any slow processing or call gtk.main_quit.

I'll have to see how that goes....




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