I booked a trip to an indoor ski centre, for my first ever snowboarding lesson. Seeing that I am an absolute beginner, and the snow centre has a main slope and a smaller slope, I assumed our lesson would be on the smaller slope, or certainly at the lower part of the main slope. How wrong I was. The lesson was up towards the higher part of the main slope. And we started by learning to control ourselves using the toe edge of the board. That meant we were facing up the slope with our backs to the way we were travelling!
Working on a system the other week, I decided to use only one of the two application servers, since they were identical machines with the same software loaded, and I only needed one machine for the test. I checked the settings, the test script I had written, the processor load and the network connection, but all to no avail - the test always failed. Over a week later, I tried the other machine and the test took just 2 seconds to run correctly. The machines might have been identical, but one of them had a hardware failure!
And I tell my students always to list their assumptions, and always check that the assumptions are valid. Now I have slipped up twice within the same week. One of the principles of the Baha'i Faith is "Independent investigation of the truth".
Saturday 25 August 2007
Friday 24 August 2007
Where are all the scientists?
As has become a habit over the last few years, the release of the GCSE results has been accompanied by comment in the media on the decreasing numbers of students taking mathematics or science.
Personally I am not surprised. What role models do our youngsters have? What is portrayed in the very media that bewail the lack of science students? It seems to me that the only role models portrayed are the sports personalities and the celebrities of the showbiz world. Whenever scientists appear, they are often portrayed as badly dressed, speaking words that most people do not understand and frequently lacking in social graces.
Also, perhaps, our concern for the safety of the pupils in schools has led to the curtailment of many experiments in classrooms. Science is now seen by many as 'boring' as much content is conveyed by watching videos. Gone are the times when pupils were let loose with geiger counters and radioactive materials (even though they were less active than the luminous paint used in the wrist watches of those days!), microwave transmitters (er, what about the mobile phones most youngsters now carry in their pockets?), static electricity generators and reactive chemicals. They were the things that excited me and instilled in me a love of science. How do teachers convey the excitement of science, if all the pupils can do is sit and watch?
Personally I am not surprised. What role models do our youngsters have? What is portrayed in the very media that bewail the lack of science students? It seems to me that the only role models portrayed are the sports personalities and the celebrities of the showbiz world. Whenever scientists appear, they are often portrayed as badly dressed, speaking words that most people do not understand and frequently lacking in social graces.
Also, perhaps, our concern for the safety of the pupils in schools has led to the curtailment of many experiments in classrooms. Science is now seen by many as 'boring' as much content is conveyed by watching videos. Gone are the times when pupils were let loose with geiger counters and radioactive materials (even though they were less active than the luminous paint used in the wrist watches of those days!), microwave transmitters (er, what about the mobile phones most youngsters now carry in their pockets?), static electricity generators and reactive chemicals. They were the things that excited me and instilled in me a love of science. How do teachers convey the excitement of science, if all the pupils can do is sit and watch?
Monday 20 August 2007
Marriage is like team work
One of our team left for his annual holiday the other day. Except that it is actually his wedding and honeymoon. As my wife and I have just celebrated our wedding anniversary, it put me to thinking about marriage in these modern times.
Our team had a monthly meeting and the team leader, when asked to nominate the best worker in the team, said "everyone". I had to think a bit about that, as we are so used to picking on one individual that we have elevated it to the "cult of the celebrity" and forgotten, in my view the need for true team working.
Marriage and team work are quite similar in many ways. Both take individuals who have different abilities and outlook on life and put them to working together. In each case, the individuals must learn to sacrifice part of themselves in order to achieve something greater. Otherwise the team will not survive. The common term today is "my partner", but married couples are partners too. In marriage, though, the partnership is made within a very public commitment.
Our team had a monthly meeting and the team leader, when asked to nominate the best worker in the team, said "everyone". I had to think a bit about that, as we are so used to picking on one individual that we have elevated it to the "cult of the celebrity" and forgotten, in my view the need for true team working.
Marriage and team work are quite similar in many ways. Both take individuals who have different abilities and outlook on life and put them to working together. In each case, the individuals must learn to sacrifice part of themselves in order to achieve something greater. Otherwise the team will not survive. The common term today is "my partner", but married couples are partners too. In marriage, though, the partnership is made within a very public commitment.
Saturday 11 August 2007
Capacity planning
Two news items caught my attention this week. One of them was a report of a court case in America where, if I understood correctly, internet providers were being asked to keep a copy of every email and web page that passed through their systems. This put me to thinking about what that would mean in storage requirements. You see, testing a program does not just mean checking that the right text, icons and graphics are displayed, and clicking an icon performs the required action. Non-functional testing is looking at reliability, speed, and capacity.
So I started to think what is the storage requirement if an internet provider held a copy of all their traffic.
For one small provider with just two 64Mbit links, assuming that those links are mainly for business users (that is, traffic mostly between 8am and 6pm) with the links at just 75% of their capacity, then in one week the total traffic would be 64 * 0.75 * 3600 seconds in an hour * 10 hours * 5 days in Megabits. That comes to 8640000 Megabits (864 Gigabytes) per week. Of course, if the provider has a few hundred or thousand individual subscribers, each downloading emails, software and music files, and browsing the web looking for maps, video clips, reading and contributing to blogs, and so on every night then that figure could easily rise to double or triple that original estimate of 864Gb per week. Taken over the course of a year it approaches something of the order of 100 TerraBytes required for the storage.
If that is the figure for one small internet provider, just stop to think what the storage requirements will be for some of the larger providers who count their customers in the hundreds of thousands.
As you can see, bandwidth capacity and storage are important points to consider in planning any new service, or when upgrading an existing one.
So I started to think what is the storage requirement if an internet provider held a copy of all their traffic.
For one small provider with just two 64Mbit links, assuming that those links are mainly for business users (that is, traffic mostly between 8am and 6pm) with the links at just 75% of their capacity, then in one week the total traffic would be 64 * 0.75 * 3600 seconds in an hour * 10 hours * 5 days in Megabits. That comes to 8640000 Megabits (864 Gigabytes) per week. Of course, if the provider has a few hundred or thousand individual subscribers, each downloading emails, software and music files, and browsing the web looking for maps, video clips, reading and contributing to blogs, and so on every night then that figure could easily rise to double or triple that original estimate of 864Gb per week. Taken over the course of a year it approaches something of the order of 100 TerraBytes required for the storage.
If that is the figure for one small internet provider, just stop to think what the storage requirements will be for some of the larger providers who count their customers in the hundreds of thousands.
As you can see, bandwidth capacity and storage are important points to consider in planning any new service, or when upgrading an existing one.
Thursday 2 August 2007
Back in the thick of it
Or should that be, back in the thick of *I.T.* ? I have been away from all things technical for the last two weeks - mostly walking, with a bit of surfing and swimming. Leave behind the computer, the phone and all that sort of thing. "What is the weather going to be" was answered by "are there clouds or blue sky on the horizon"!
Sometimes it pays to see just how dependent we have become on technology. It seems many of us could not function at all without it. Of course, there are those like myself whose work is based on computers, whether that be administering them or programming them. I am thinking more of how we seem to 'need' technology for entertainment. Gone are the days for most people (did they ever exist for some?) of gathering together to talk, tell stories, sing or dance, or enjoy walking in the countryside.
In a couple of weeks I am taking our family to an Open Air concert, complete with full orchestra, singers and a firework finale. We shall go with a picnic meal and (given that this is England in summer) raincoats.
I will 'escape' to the country whenever I can. How about you?
"The city is the home of the body but the country is the home of the soul" (Baha'i writings)
Sometimes it pays to see just how dependent we have become on technology. It seems many of us could not function at all without it. Of course, there are those like myself whose work is based on computers, whether that be administering them or programming them. I am thinking more of how we seem to 'need' technology for entertainment. Gone are the days for most people (did they ever exist for some?) of gathering together to talk, tell stories, sing or dance, or enjoy walking in the countryside.
In a couple of weeks I am taking our family to an Open Air concert, complete with full orchestra, singers and a firework finale. We shall go with a picnic meal and (given that this is England in summer) raincoats.
I will 'escape' to the country whenever I can. How about you?
"The city is the home of the body but the country is the home of the soul" (Baha'i writings)
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