Reflections on distributed computing in clusters, clouds, and grids. Douglas Thain. You can get stuck for a long time searching for a question that doesn't quite address your question. If a post answers the very specific question that you have, that's nice, but it doesn't necessarily help you to develop your own solution to other problems. What's worse, the answers are sometimes incorrect, or not applicable to the situation that you actually have.
Some of the solutions don't actually work. If you intend to be a professional who solves problems for peopleyou need to be able to think through these issues yourself, rather than just copy-pasting a solution. In the case of validating email addresses, that means learning how regular expressions work from first principles, and then thinking carefully about what problem you really intend to solve. Now, I can't prohibit anyone from looking on Stack Overflow, nor will I try.
But I would like to suggest some different habits of learning that will lead to more fulfilling results and less frustration. Experiment by combining them in simple ways.
Prof. Douglas Thain
Solve your actual problem gradually by building up complexity. Every layer of a computer system is an abstraction that is made up of some fundamental set of basic operations, which I'll just call atoms. Each atom manipulates the system in some particular and well-documented way.Twin flame movies
Once you know what the atoms are, then you need to learn how they work in detail. This is going to require some effort on your part. Find the reference manuals for those atoms and read them.
If it has a man page, read it. Yes, really read it, I'm not kidding.Allen-Hall Mortuary. LoganUT Send Flowers. Monday, May 2, Tuesday, May 3, Benson LDS Church.
More Obituaries for Wilbur Thain.
Looking for an obituary for a different person with this name? Wilbur Sutton Thain. Add a Memory. Share This Page. He was raised in West Los Angeles. His father and uncles started his love for fly fishing with a trip to Henrys Lake in Idaho in the early s. He graduated from University High School, which had 7, students in He was married to Ruthie J.
Tait Andres in June of He graduated in and started his internship at the U. Naval Hospital in San Diego. He was transferred to an amphibious troopship at the end of his internship. They landed in Seoul, Korea, days before the armistice was signed. Upon leaving the service he began a one year residency at the Bakersfield General Hospital. He and Ruthie and their two children, Karen and David moved to Logan, Utah, in where he established his medical practice.
He delivered over 3, babies in his 30 years of practice in Logan. He loved his practice and the people he served. In particular, he loved working with children with special needs. He served as the Medical Director for 13 years. The children were delighted in coming to his office and seeing Dr. One of their great delights was a coin for his large gumball machine as a treat at the end of the visit. Bill had worked nights for Howard Hughes' private office while going to medical school. This led to him becoming Mr.
Hughes' private physician in the s. This disrupted his practice for a short time, but he returned fulltime in upon the death of Mr. Once in Logan, he became the adviser to the fraternity where they started a chapter on the USU campus. He enjoyed the time working with the young men for many years. He was a life member of the Benevolent and Protective Order of Elks.
He retired at 75 years of age to live in Minden, Nevada, then returning to Cache Valley in He and Ruthie enjoyed worldwide traveling. They continued to pursue his lifelong love of fly fishing.Sign up for your own profile on GitHub, the best place to host code, manage projects, and build software alongside 40 million developers.
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As you can see, the fixed approach crashes to zero after about clients, whereas the Ethernet approach continues to maintain a high level of throughput. It is not as high as the performance under low load, but it is relatively stable over a wide range of load. The disadvantage to using exponential backoff is that it is going to extend the time to recovery after a failure by about a factor of two.
Suppose that you are a client talking to a web server which crashes. You wait one second, try again, then two seconds, and so on. If the web server is unavailable for thirty seconds and then recovers, the client will not notice right away, because it will be in the middle of waiting for thirty seconds before trying again.
Now, extending a thirty second outage to a sixty second outage is unlikely to cause any real heartache. But, what about extending a thirty minutes to sixty minutes? That could be irate customer territory. So, you need to balance the needs of your customers against the capacity of your system. If you you want to handle clients and have a maximum recovery-after-failure time of one second, then you had better make sure that your system can handle failed requests per second at a sustained rate.
That may sound easy, but if each failed request involves a database query, a write to a log file, and an email to an administrator, then you will be quickly overwhelmed. Now let's answer the original question: How should I pick the backoff parameters?
Let's assume that they delay chosen at any point is based on an initial timeout Tan exponential factor Fthe number of retries so far Na random number Rand a maximum timeout M. Interesting and eye-opening explanation. I've always wondered at the rationale behind exponential backoff. This is such a good post. Thank you for sharing this information. Keep it up! Douglas Thain. In response to my previous article, a commenter asked: Why exponential backoff?
To put a finer point on the question, How should I choose the parameters for my exponential backoff algorithm? I think many people choose parameters that back off too much, too fast. The idea of exponential backoff in distributed systems goes back quite a few years.
An early example can be found in the Ethernet network. In its original form, an Ethernet consisted of a single cable connecting all stations on the network.
Baune, Douglas W CPA
Unlike some other computer networks at the time, it had no direct means of controlling which station could transmit at any time. If one station transmitted while everyone else was silent, then the message would be received by all stations. But, if two or more transmitted at once, every station would receive a corrupted message. Here's an analogy. Imagine a school gymnasium with people lined up along the walls. People have to shout to be heard, and there are multiple conversations going on at once.
As you probably know from experience, this can only work if one person speaks at a time. So, each person waits for a quiet moment to speak. Occasionally, two people try to speak simultaneously, and then you have a silly game of each waiting a bit and then trying again until the tie is broken.
That is essentially how Ethernet works. Each party that wants to transmit waits for a quiet moment, and then sends a message.In transcribing them I have kept them as near to the originals as possible.
It must be one of the peculiarities of life that we seem to reminisce, as we get older.Pyinstaller python dll not found
All I know is that the Royal Navy was rarely if ever in my thoughts during my life but now I find myself looking back and doing just that. After that phase I fancied flying — still in its infancy 50 years ago.
I got accepted on my school qualifications as I had passed the RAF apprentices examination. I went to Southampton and passed the stiff medical including blowing up the mercury to a certain degree. I had heard nothing by the time war started so I joined the navy instead thinking I would switch later.
I spent one morning in RN Barracks at Portsmouth. I had to see a Naval commander. I kept quiet that I had already applied to join the RAF as an observer. It was not very organised at that stage of the war. After about five days in training and an uncomfortable journey I finished up on the depot ship Iron Duke an old WW1 battleship. After two days on the Iron Duke waiting for transfer to the Ark Royal a German submarine got through the boon and sunk one of our battleships the Royal Oak.
There were only about twenty Naval men on board. The rest f the passengers were the colonials going back to Africa after a vacation in the UK. I had a shared cabin and lived like the paying passengers. I did get some work to do, the twenty odd of us RN had to do watches on the bridge including nights. I soon found out about the middle watch i. The captain, merchant nay of course, was a bluff genial typical old school type, friendly. I had a pair of binoculars and was told to look out for U boats — German submarines.Thain started his career as a Royal Air Force sergeant.
He was later promoted to warrant officer and was given an emergency commission as an acting pilot officer in April The aircraft was carrying the Manchester United football team back from a match in Yugoslavia. After two failed attempts, due to problems with boost surging in one of the Ambassador's engines, Thain chose to make a third try, hoping to stay on schedule, rather than remain overnight for maintenance at Munich. The aircraft failed to take off and crashed, killing twenty-three people.
Twenty people died on board, and three died later in hospital. The German airport authorities blamed Thain for the accident at the time, saying he did not de-ice the aircraft's wings, despite eyewitness statements indicating deicing was not required.
He never flew for an airline again. It was later learned that slush on the runway had made it impossible for the Ambassador to gain flying speed. Despite this finding, German authorities continued to blame Thain.Tamara Louie: Applying Statistical Modeling & Machine Learning to Perform Time-Series Forecasting
Retiring to his poultry farm in southern England, Thain died after suffering a heart attack on 6 Augustat the age of 54, in Berkshire. He was buried three days after his death. From Wikipedia, the free encyclopedia. James Thain. Retrieved 4 July Air Disasters Guild Publishing,p. The Times.
London: Times Newspapers. Retrieved 11 January Archived from the original on 19 February Retrieved 12 July Munich air disaster. Namespaces Article Talk. Views Read Edit View history. Languages Add links.Sign up for your own profile on GitHub, the best place to host code, manage projects, and build software alongside 40 million developers. Learn more about blocking users. Learn more about reporting abuse. Example code for compilers textbook.
A simple OS kernel for research, teaching, and fun. Trace what environment variables are used by an application. Example workflows for the Makeflow workflow system. Stepper Library for Arduino. Singularity: Application containers for Linux. Projects and code for operating systems class at Notre Dame. Middleware for your critical data. Skip to content. Dismiss Create your own GitHub profile Sign up for your own profile on GitHub, the best place to host code, manage projects, and build software alongside 40 million developers.
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