[2011-05-20 23:22:41] /Users/austinmills/.rvm/wrappers/ruby-1.8.7-p302/rake install
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:827:in `report_activate_error': Could not find RubyGem rake (>= 0) (Gem::LoadError)
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:261:in `activate'
	from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/rubygems.rb:68:in `gem'
	from /usr/bin/rake:18

Then you just need to make sure that rake is installed in your global gemset (‘rvm use 1.8.7@global’ and ‘gem install rake’).

And thus, it was decreed that our house would host the family Thanksgiving this year. Now, I could have sat around and tended the smoker for 8 hours like our barbecue ancestors would have, but we have the benefit of modern technology… so a few modifications were in order:

The first modifications were some simple ones to improve airflow — namely, extending the chimney down to grill level and sealing some of the air gaps with JB weld.

The next problem I looked had to do with the byproduct of charcoal cooking — the ash. The side fire box comes  with a pull-out ash tray, but the problem is that the grill which holds the coals sits on top of the ash tray — so there’s no way to remove ashes while you’re cooking. (Also, the metal in the OEM charcoal grill had warped due to heat after a single cook.) So, I bought a replacement grill from Lowe’s and had my brother-in-law cut it down to size (about 17″x30″). Now, it sits nicely above the ash tray, and I can dump the ash while cooking, without affecting the coals:

You can also see in that picture part of the electronics setup: the stoking fan, a 10cfm fan which can be turned on and off electronically to control the rate at which the charcoal burns (and thus, the smoker temperature). Normal smokers depend completely on the chimney effect, which works well, but the only way to control airflow is by adjusting the intake and outflow openings, which is inexact and can also be greatly affected by wind conditions.

The fan is controlled by the brains of the operation:

This is a Stoker, from Rock’s Barbque. Based on a TINI board, it has 5 inputs and outputs for temperature sensors and fans, as well as the user interface you can see here for controlling the fans and configuring temperature setpoints. It also has an ethernet port, which I have connected to a wireless bridge (you can see it hiding above the controller in the picture above) so that it can connect both to my local network and the Internet as well.

Through the buttons on the controller itself, or the built-in web interface, you can see what the current temperature readings are, and also control it:

Here, I have Sensors 1 and 3 set up in different locations in the smoker, pulling the ambient (‘cooking’) temperature. Sensor 1 is controlling Blower 1 (the fan), and if the temperature goes past the target, the fan will turn on or off (some hysteresis is introduced to keep the fan from turning on and off rapidly when near the target temp).

Now, you might think, temperature over time… that would be a great thing to see on a graph. With the assistance of AmirM’s StokerLog, we can! Here’s the chart from my Thanksgiving turkey cook:

As you can see, I started the smoker around 9:30, added the bird at around 10, and proceeded to cook it for about 5 hours. Here, the purple line is the temperature according to a temperature probe inserted into the deepest part of the breast, and the blue line moving at right angles is the fan output, either on or off.

One of the best things about the smoker setup is that I no longer have to watch it like a nervous mother hen — I wasn’t even at the house between 10:30 and 12, but I never worried because I’d forwarded a port on my router to the stoker’s web interface and could check on it as much as I wanted.

How did the turkey turn out? Awesomely moist, and with a great smoke flavor:

It makes me appreciate companies like SliceHost, who don’t offer an SLA and aren’t afraid to say so.

This graphic shows that some students finished in 12 hours what others took 50 hours to do — with roughly equivalent quality!

I’ve seen this personally, as well — we probably all have — where you know one developer can do something twice as fast as another… so why aren’t more companies hiring based on that? If you have to pay 1.25x as much for a developer who works 1.5x faster… wouldn’t you take that deal? I wish more companies would.

Almost all optimizations for performance are going to introduce some amount of friction in your development process and possibly add failure points, as well — and if you have a solution that works right now, and is going to work for what you estimate the load to be over the next month or two (depending on your release cycle), then you have solved the problem you have right now, and should spend that time adding features or fixing bugs instead.

We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Yet we should not pass up our opportunities in that critical 3%” — Donald Knuth

In a comment to the page, Gregg Pollack points to his screencasts on Scaling Rails — I haven’t watched them yet, but he had a good session on ActiveRecord at last year’s Lone Star Ruby Conference.

“To say that a telephone subscriber may produce the result in question by cupping his hand and speaking into it, but may not do so by using a device … is neither just nor reasonable.” Hush-a-Phone v. FCC, 1956

Educators are currently requesting from the Copyright Office at the Library of Congress an exemption to the parts of the DMCA that prevent them from creating a copy of a copy-protected DVD so that they could use clips from the video in their class. Before the DMCA, this was an accepted practice, falling under the ‘Fair Use’ exemption from copyright law. After the DMCA, however, even if copyright law allows you to make a copy, if the material is copy-protected at all then you commit a criminal act by making a copy. Thus, the teachers wanting to use this material in their classes would break the law if they copied the DVD for classroom use.  The exemption the teachers are seeking is already granted to film teachers, and the teachers just seek that it be expanded to cover teachers of all subjects.

The MPAA, seemingly objecting out of habit more than for any particular cause, had an alternative suggestion for making a copy: point a camcorder at a TV. In case you think I’m joking, here’s the ‘instructional’ video:

http://vimeo.com/moogaloop.swf?clip_id=4520463&server=vimeo.com&show_title=1&show_byline=1&show_portrait=0&color=&fullscreen=1

As I read about this, I was struck by the similarity to the court cases that were brought against AT&T in the 50′s and 60′s, Hush-a-Phone and Carterfone — cases where the incumbent was fighting intensly to protect their existing business model, often to the point of absurdity.

In the early 1950s, phone service was different than it is now. Today, you can walk into a store and buy a variety of phones from a number of manufacturers, and you’re free to plug whatever phones you want into the wall, providing that they meet reasonable standards for the interface (the electrical connections made at the jack). Until 1956, however, you could only get telephone equipment from AT&T, and they could disconnect your service if you attempted to hook anything else up to your phone system — even a simple piece of plastic. In the late 40s, a company named Hush-a-Phone was selling a device of the same name, a snap-on receiver that allowed you to talk into the phone without being overheard:

It was, as the court would later note, pretty much the same thing as cupping your hand around the receiver. AT&T’s tariffs (the rules under which the service was offered) forbade attachment of any device “not furnished by the telephone company” (known informally as the foreign attachment rule), and they informed both users and vendors that the Hush-a-Phone was not allowed and that users could be disconnected if in violation. It should be noted that AT&T sold rival devices providing for Push-to-Talk and Push-to-Listen, which AT&T recommended the use of instead. After hearing from AT&T, Hush-a-Phone’s distributors stopped carrying the device and Hush-a-Phone initiated an antitrust court case against AT&T, leading to a rather reasonable decision for Hush-a-Phone in 1956 (quoted above). Much like the MPAA, AT&T didn’t seek to challenge the fact that somebody could talk in hushed tones or cup their hand — that was allowed — but using a device to do it was forbidden. The principal of fair use tells us, and MPAA agrees: making a copy of a movie should be allowed. The MPAA just doesn’t want it to be a good copy.

In the early 50′s, a Texas man named Thomas Carter saw an opportunity for oilmen and ranchers who wanted a way to be able to have a phone conversation while they were out on their property. They often had two-way radios with them, so Carter invented a device, the ‘Carterfone’, that basically connected the base station of the two-way radio to a telephone on the other end. If a Carterfone user wanted to make a call, he would radio in to the attendant at the base station and have them dial the phone, and then place the receiver down on a cradle which had a speaker and microphone.  The Carterfone user could then talk just like a normal phone call. There was actually no electrical connection between the Carterfone or radio and the phone system.

Hush-a-Phone had cleared the way for non-electric devices, but didn’t apply to electric devices. Once again, AT&T (protecting their business model) stated that this device was in violation of their tariffs and warned users that they could be disconnected if they used the Carterfone. Carter filed a complaint in 1966, it was decided in 1968. A (possibly apocryphal) story of the decision-making process goes:

Carter’s lawyer (C): “It’s acceptable to talk on the phone, isn’t it? That’s allowed by the tariff?”

AT&T expert (ATT): “Yes, of course.”

C: “And it’s acceptable to use the two-way radio?”

ATT: “That’s not my area of expertise, but yes.”

C: “And if a secretary takes a message from the phone, she can relay that message over the two-way radio?”

ATT: “Yes, that’s allowed.”

C: “And if the recipient responds over the radio, the secretary can communicate that over the phone?”

ATT: “Yes, that’s allowed.”

C: “And if this happens repeatedly, the secretary going back and forth, then a conversation could be had from the radio user to the phone caller, yes? Within the tariff?”

ATT: “Yes, that’s fine.”

C: “And if the secretary had the radio headset to one ear, and the phone to the other, just repeating what was said, that’s acceptable under the tariff?”

ATT: “Yes, that’s allowed.”

C: “And then could we just remove the secretary and just place the radio headset close enough to the phone so that they could hear each other?”

ATT: “No, not at all. That would be a violation of the tariff.”

Judge (concerned): “Excuse me?”

Once again, it was ruled that the prohibition of attaching foreign devices to the network was “unjust and unreasonable” and that “a customer desiring to use a device to improve the utility of the system should be able to do so” (slightly paraphrased, original here). Once again, we see that once you’ve decided that an act is permissible, it’s unjust/unreasonable/downright silly to limit or impair the ability to do it well — something the MPAA could take to heart.

It’s not just a question of whether it’s right or wrong — it’s also a damper on the freedom to innovate, to come up with new applications and new uses for existing content or technology. Carterfone was decided in June of ’68. By August of the following year, MCI had received the first license to compete with AT&T. In spite of AT&T’s foot-dragging over the next 10 years, a variety of other products flourished, paving the way for customer choice in phones, data communications, widely available residential modems, and even the Internet as we know it today.

The MPAA, on the other hand, agrees that copyright law allows for fair use of material but still wants to prohibit it happening in practice — limiting not only the direct use but also the ability to use the content in innovative ways.

They could allow teachers to make truly creative lessons that would have a strong impact on students… but if the MPAA has its way, the students will barely be able to make out the image on the bootleg-quality video.

I think the MPAA needs a Carterfone decision of their own.

Back from Japan, and as always there’s a selection of pics for your enjoyment:

The highlights of our trip (44 pictures): Trip Highlights

Some pictures that I thought turned out especially well (34 pictures): Nice Shots

And, for those with interest and the time to spare (1.4k pictures): All the photos

Just got back from a nice ride over by the lake on Lime Creek Road — quite a fun ride, with lots of turns and some beautiful scenery along the way. And for all those who wanted to see some pics of the two of us on our bikes, check out the Flickr set.