Computer Science Teacher
Computer Science Teacher - Thoughts and Information from Alfred Thompson

May, 2008

  • Computer Science Teacher - Thoughts and Information from Alfred Thompson

    Who Cares How Fast the Code Is?


    Ironically one of the problems teachers can have with teaching about optimizing programs is that computers are a) so fast now and b) getting faster all the time. Students often do not see the need to create more efficient algorithms because they assume that what they have is fast enough and if it isn’t then the next computer they buy will “fix” the problem by being faster. And truth be told with most of the toy programs we are forced to use in a classroom situation (not enough time for really large complicated projects) things do work out that way. But real life is more complicated then that. So we really owe it to students to discuss code optimization (and refactoring which is closely related.)

    I’ve had a couple of conversations with students over the years that basically took the form of “yeah it is slow but it works and I’ll never need to run it again.” There is some logic to that of course. I once had a program that I ran maybe once a week. I had thrown it together in a hurry to meet an immediate need. Once I realized I would need it more often I also realized that it was very inefficient. I saw several ways that it could be a lot faster. But I did some math. It took about a minute too long (it could possibly run in seconds) and it would take me at least an hour to re-write it. Was I going to run it 60 times? Probably not so where was the payback for my time? I did get a new computer shortly there after which was fast enough that the run time was cut in half so now the payback time was 120 more runs – so it would really cost me more time to fix then it would save me. That sort of math takes place more than many would think by the way. But sometimes it comes out very differently.

    Sometimes the issue is around applications that really need to be fast. Other times it is around hardware that has some limitations that have to be taken into account because changing the hardware is not an option. Cy Khormaee recently talked to Paul Oliver of Legendary Studios to come up with a list of optimizations that should be taken into account when creating games for the Zune device. The Zune was designed as a music player not a game device. Since XNA Game Studio 3.0 (now available in preview) lets programmers create games for the Zune this creates an interesting learning opportunity. Specifically the hardware limitations have to be taken into account if one wants to create a game that performs well enough for people to really enjoy. This is an opportunity to have a real “teachable moment.” The list Paul and Cy have makes for a good read and the start of some interesting discussions.

    Also on performance, Dare Obasanjo, who deals with some very large data intensive social networking applications, took a look at some scaling problems with Twitter recently on his blog. He examines how basic design choices can make the difference between an application that really works and one that collapses under the weight of input/output needs. This is a discussion worth reading about as students consider that many of the most important applications revolve around how data is saved and retrieved.

  • Computer Science Teacher - Thoughts and Information from Alfred Thompson

    Class Programming Project Ideas


    It is often interesting what one finds by reviewing referral links (the information that shows how people get to a blog or web site). One of the sites I found last week was Vince Huston’s “Teaching Programming” page. Besides having a number of useful links (including one to my blog – thanks!) is a list of useful programming project ideas. Now some of the projects he lists are fairly well known (Towers of Hanoi for example) but some are less so. But there is added value on this site.

    First off, on the main page, he lists opportunities for each project – topics where the project fits into the curriculum in three areas:

    • Introductory opportunities
    • Data structure opportunities
    • Algorithm opportunities

    Also on the main page is a link to a write up for each project. Some of them are very detailed but all of them include screen images of possible solutions (sometimes both as console projects and windowed/GUI projects) and discussion/thinking points about possible solutions. He doesn’t have completed solutions available (that I saw – he might have if you contact him directly) but there is sample code in several of the write ups. He works mainly in C++ and Java but these projects should all work in Visual Basic .NET or C# just as easily. (And sure, lots of other languages. :-) )

    If you are looking for some projects to end the year or to add into next years plans these projects may be a place to start.

  • Computer Science Teacher - Thoughts and Information from Alfred Thompson

    Microsoft Education Team Blogs


    The Microsoft Education US Specialist Team just started there own blog. This is the technical team that supports Microsoft’s pre-sales efforts to education. The blog itself should be interesting and there are a couple of introductory posts there already.

    One of the other useful things they have is one of the most complete lists of education related blogs by Microsoft people I have ever seen. It’s a world wide bunch with a number in the United Kingdom and at least one in Australia. The higher education focused blogs will have things of interest to K-12 and the other way around too. There list is below.

  • It's all about edU
  • Off Campus
  • UC in Education blog
  • Higher Education Tech NE
  • Higher Education Tech Mid-Atlantic
  • Kevinsul's Mgmt Blog
  • Cool stuff and happenings for HiEd
  • HiED West Region News
  • Application Platform and Development Tools
  • A Work-Life Balance
  • Computer Science Teacher
  • Academic Care Blog
  • Microsoft Belfast - School Technology Innovation Centre (STIC)
  • The UK Higher Education Blog
  • Microsoft UK Schools News Blog
  • The UK Further Education Blog
  • UK Academic Team Blog
  • OneNote and Education
  • Higher !nnovation
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