Archives 2012

How can an audio server take up 900MB of RAM?

So we want to capture the (alsa) output of processes and pipe it into an mpeg-ts stream.  Except gstreamer's alsasrc can't do "monitor", so we wind up having to do a pulsesrc... which brings the server to its knees in a few minutes with memory exhaustion for no reason I can fathom.

Annoying part is ...

Continue reading

Experience has some value... and risk

Each time I sit down to help someone relatively new to coding I find myself somewhat awe-struck at how much I've "forgotten".  Just install nginx with gunicorn and django in a virtualenv.  Package up your code with a using distribute.  Run your unittests with Nose.  Use sphinx and embedded doctests.

You tell someone that ...

Continue reading

Piping Data Around with Fussy

In one of those cases where you ask a question, don't get an answer, then spend far longer than you intended playing with the problem, I've just added a Pipe mechanism to Fussy (why to fussy, you ask? Well because that's where I wanted to use it).  Basically it provides a small wrapper around subprocess ...

Continue reading

Kubuntu really does kinda rock quietly...

I just upgraded our last machine to Kubuntu 12.04 (the laptop has been running it since a beta).  In place update with about 2 minutes offline... Debian/Ubuntu/Kubuntu really is amazing that way.

The new Kubuntu is pretty much just like the old Kubuntu.  It works, is very pretty, but just gets out of the way ...

Continue reading

So apparently I don't need to write my own test code...

Just stumbled across the OpenGL Samples Pack, which is a bunch of OpenGL sample code for advanced features... exactly the kind of thing I need to test if I've got PyOpenGL working... of course, they're written in C, but it's way easier to translate from C to Python than to come up with dozens ...

Continue reading

2Day Python (Our Tutorial for Software Carpentry)

Went to the Ladies Learning Code Python session dry run this evening and it reminded me that we never got the Software Carpentry tutorial up.  It's now available for live reading at:

and you can branch and alter/adapt the source (in restructured text) as you wish using:

bzr branch lp:2daypython

One thing that seemed ...

Continue reading

Announcing the Fussy Firmware Packager

As mentioned a while ago, I was looking for a firmware packager that would allow for "user uploads a signed bundle" style upgrades for hardware devices.  Esky is similar (even a similar on-disk layout), but focused on cross-platform and distutils-based "application" setup.  Fussy is intended for "core of a system" setups, where the entire user ...

Continue reading

Libraries Exposing 8-bit Binary Strings to Python 3, Best Practice?

Query came up on PyOpenGL-dev this morning about how to handle GLchar pointer arguments.  These are binary-specified arguments, they are human-readable text *most* of the time, ascii source-code and identifiers, that kind of thing, but nothing about GLchar pointer requires that they be ascii.  They *are* 8-bit character strings (that's what GLchar pointer means).

But ...

Continue reading

Firmware Upgrade Module?

I'm wondering if this package exists, preferably in Python (well, I *know* it exists, as I wrote it for a commercial project, and can't use it any more.  I'm hoping there's an Open Source version I can enhance for future use):

  • bundle a .tar.gz (signed, optionally encrypted) for delivery to embedded platforms
  • on platform, decrypt ...

Continue reading

Research in Action 2012

Spent the afternoon at Research in Action (at University of Toronto).  Highlights:

  • big classical (i.e. right out of the textbook) neural network used for road detection in satellite imagery; okay results, huge amounts of computing power involved; not sure it's really all that much better than a hand-coded solution, but it did seem to work ...

Continue reading

Monthly archives

Previous year


Next year