Kevin's Link Blog

Opening files w/sudo in Emacs

kevin — Fri, 30 Jan 2009 16:35:21 +0000

C-c C-f /sudo::

Works like a charm in Aquamacs! You’ll need to install tramp for this to work:

Singletons: They’re Ugly in FP, too

kevin — Mon, 12 Jan 2009 18:34:31 +0000

http://www.planeterlang.org/en/planet/article/Async_or_Sync_Log_in_Erlang_-_Limit_the_Load_of_Singleton_Process/

Singletons. Seems like they’re rarely a good idea. Ever.

Pragmatically Scaling Erlang

kevin — Tue, 04 Nov 2008 15:06:53 +0000

Excellent series of articles by Richard Jones detailing the work required to scale a Comet server written (mostly) in Erlang out to 1 million connections.

Part 1
Part 2
Part 3

JSON For Erlang

kevin — Fri, 31 Oct 2008 11:02:59 +0000

http://www.erlang-projects.org/Public/news/ejson/view

There’s also the mochijson module in mochiweb but this looks useful in situations where the entirety of mochiweb might be overkill.

Error -12

kevin — Wed, 15 Oct 2008 12:17:34 +0000

When ejabberd or Jabberlang return “error: -12″ this means they cannot load their native library drivers. Normally this means they can’t find expat_erl.so.

To fix:

Verify the drivers exist in the priv directory of the Jabberlang or ejabberd applications, depending on which one you’re using.
Verify the path, returned by ejabberd:get_so_path(), exists and is readable by the user the Erlang process is running under.
Make sure the shared library has been built for the appropriate platform. In other words, make sure you’re not loading a Linux shared library on OS X, for example.

May Google find this so someone else doesn’t experience the pain I did yesterday.

Reflective Record Access

kevin — Thu, 25 Sep 2008 16:32:13 +0000

OMG! Reflective record access by Ulf Wiger: http://www.trapexit.org/forum/viewtopic.php?t=6385&sid=a64a45192821687eddb69fe3ae466383

Now records behave much more like how I’ve always thought they should without the mind-bendingly ugly syntax.

Formlets

kevin — Wed, 17 Sep 2008 12:23:54 +0000

Hmm. Interesting reading: http://groups.inf.ed.ac.uk/links/formlets/

Hot Swapping Code in Erlang

kevin — Fri, 12 Sep 2008 12:58:59 +0000

Dominique Boucher on the pitfalls of hot code swapping: http://theschemeway.blogspot.com/2008/09/hot-code-swapping-pitfalls-in-erlang.html

Mitchell Hashimoto on the basics of hot code swapping: http://spawnlink.com/articles/rules-of-hot-code-swapping/

Optimizing Erlang

kevin — Fri, 29 Aug 2008 18:31:27 +0000

The indomitable Joel Reymont write his first article on optimizing Erlang:

http://www.wagerlabs.com/blog/2008/08/optimizing-erlang-a-death-match-of-arrays-vs-tuples.html

Great Lispy Bits Batman!

kevin — Mon, 18 Aug 2008 16:30:36 +0000

Via reddit:

Symbolics Lisp document dump