Archive for September, 2009

Wednesday, September 30th, 2009

Geek Thoughts: perfect storm?

Raining bacon.

More collected Geek Thoughts at http://geekthoughts.info.

Sunday, September 27th, 2009

View on Publishing

An editor’s view on the modern publishing market, how it’s changing, and challenges any book faces in running the gauntlet of publication. Worth a read. -m

Saturday, September 26th, 2009

Geek Thoughts: stability theory

My personal stability theory, as it applies to software engineering: in a multilayered software architecture, the likelihood layer N works well can be expressed as a probability (less than 1 in practice) relative to the lower level layer N-1. For example, if you attempt to write a mission critical Tcl app on a flaky Tcl interpreter, you’re in for some long nights. Via multiplication, a corollary is that the more layers a system has, the less likely it is to work well. (As an aside, I’m not arguing that all software architectures should have fewer layers–other forces outside the scope of this article work against systems with too few layers.)

Joel said something similar lately in the article The Duct Tape Programmer. There is a strong tendency for many coders to over-engineer a system, building towering heights of abstraction. In contrast, a Duct Tape Programmer gets the job done by making something ugly (and with fewer layers) but at least it works. So far this is a fit with what stability theory predicts.

But then he speaks out against unit testing, referring to it in similar terms to the extravagant tower. Quoting JWZ: “If there’s no unit test the customer isn’t going to complain about that.” Here stability theory makes a different prediction. Particularly in the lower levels of the system, flakiness is disastrous. You have to be sure that your foundation is stable before building upon it, or you’re in for keyboard-on-forehead-induced head trauma. This is true no matter how tight the deadlines are or how much pressure is on. In fact, when you don’t have time for a write-over, its even more important to get it right the first time.

The top accomplishment for a coder is shipping software. Duct Tape Programmers make this happen by avoiding needless complexity, which is a great principle to live by. I’m reminded of what Brian Kernighan is attributed as saying:

Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.

Debugging, or more generally making software that works well all the way to the user-facing layer, is hard. Anything that provides fundamental assertions about the stability of your foundation is a useful tool, so don’t slack off on the unit testing.

What about you? Have you found stability theory to be supported by the facts? Comment below.

-m

Thursday, September 24th, 2009

Mead Judge study guide

The BJCP has released a new study guide for the Mead exam. At the homebrew competitions I’m one of the (seeming) odd ones who asks to be on the mead flights, so this is a welcome development. -m

Tuesday, September 22nd, 2009

XForms Developer Zone

Another XForms site launched this week. This one seems pretty close to what I would like XForms Institute to become, if I had an extra 10 hours per week. -m

Wednesday, September 16th, 2009

Billion triples challenge

I had been asking around earlier for large RDF datasets. Here’s one. Looks like a great contest to build an app around this, but unfortunately, the deadline looks like it’s soonish (1 Oct).

What is it?

The major part of the dataset was crawled during February/March 2009 based on datasets provided by Falcon-S, Sindice, Swoogle, SWSE, and Watson using the MultiCrawler/SWSE framework. To ensure wide coverage, we also included a (bounded) breadth-first crawl of depth 50 starting from http://www.w3.org/People/Berners-Lee/card.

The downloaded content was parsed using the Redland toolkit with rdfxml, rss-tag-soup, rdfa parsers. We rewrote blank node identifiers to include the data source in order to provide unique blank nodes for each data source, and appended the data source to the output file. The data is encoded in NQuads format and split into chunks of 10m statements each.

The page includes some fairly detailed statistics on the data breakdown. Cool. -m

Monday, September 7th, 2009

Geek Thoughts: estimation

I think estimation is an important skill, and if not, I’ll eat my 10,000 hats.

More collected Geek Thoughts at http://geekthoughts.info.

Thursday, September 3rd, 2009

Geek Thoughts: this is the title of a post on self reference

This sentence describes a unique story by David Moser. This sentence reinforces the notion that the story previously alluded to is not only entertaining but also thought-provoking. This sentence is false. Some sentences can even refer to themselves without using the word “this”. This sentence concludes the post with a pithy and memorable flourish.

This line contains a link to more collected Geek Thoughts at http://geekthoughts.info.

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