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With the amount of injuries that occur at the gym every year, it's safe to say that fitness can be a very daunting and dangerous task.
I don't know who thought that it would be a good idea for her to try and jump on a medicine ball. As if beer pong wasn't cool enough, this cool twist involves two Roombas and the need for even better aim.
Did you ever, when you were a kid, or even now, have the urge to put your finger in a hole to see if it would come back out? The man said he wasna€™t afraid of the cub, but they saw the momma bear on another hole, and we ALL know you don't mess with momma bear! This chapter explains why you should read this book and how it can help you with any computer performance problem, now or in the future.
Some have hundreds of pages of very difficult math that most people cana€™t do and most problems dona€™t require. There are so many different technologies in your transaction path; to read all the necessary books would take longer than the average corporate lifetime.
Almost all manuals about a specific version of a technology were written under tremendous time pressure at about the same time the engineering was being completed; thus the engineers had little time to talk to the writers. What Ia€™m about to tell you will work for any collection of computers, running any software that has ever been built.
Whether you are studying the slow response time of a computer, the root cause of a traffic jam, or why you are always in the slowest line, understanding those forces gives you a big insight into why this is happening.
Many parts of this book help you solve the diversity and complexity problems mentioned earlier by helping you quickly determine that large chunks of your computing infrastructure are not the problem. Once focused, a large fraction of everyonea€™s effort is spent working in the right place and on the right problem. If you can replace S with the number 2 and U with the number 0.5 and calculate that R is equal to (spoiler alert) 4, then you have all the math you need for a long career in performance.
In the future, money will still be important, humans will still want to avoid risk, office politics will still matter, and there will be many ways that you can be right, but still fail because you did not pay attention to the people involved. Having worked many performance problems from problem discovery, through solution presentation to senior management, and then on to problem resolution, Ia€™ve made a few mistakes and learned a few tricks. If you are impressed with work experience, then read on as Ia€™ve spent the last 25 years teaching performance fundamentals, capacity planning, modeling, and performance testing of websites.
If you are a person who is only impressed with academic qualifications then I have few to offer you.
Your business depends on a collection of computers, software, networking equipment, and specialized devices. All companies have an internal language and shorthand terms they use when describing the subset of the entire computing universe that determines their customera€™s experience.
In performance monitoring you need to know three things: the incoming workload, the resource consumption and what is normal.
You need to know the incoming workload (what the users are asking your system to do) because all computers run just fine under no load.
Expected problems are when the users are simply asking the application for more things per second than it can do.
Unexpected problems are when the incoming workload should be well within the capabilities of the application, but something is wrong and either the end-user performance is bad or some performance meter makes no sense. On any given day you, as the performance person, should be able to have a fairly good idea of how much work the users are asking the system to do and what the major performance meters are showing. With rare exception Ia€™ve found the lack of easily available workload information to be the single best predictor of how bad the situation is performance wise.
The data you collect can also be used to predict the future with the other three tools in your bag: Capacity Planning, Load Testing, and Modeling. Capacity planning is the simple science of scaling the observed system so you can see if you have enough resources to handle the projected peak load, but it only works for resources you know about. Capacity planning is like a pre-party checklist where you check if there are enough: appetizers, drinks, glasses, places to sit, etc.
Capacity planning starts by gathering key performance meters at a peak time on a reasonably busy day.
Now scale (multiply) the observed meters by the bossa€™s answer to get the projected peak utilization.
In my experience, the application is rarely reengineered unless the inefficiency is egregious and the fix is easy and obvious. Capacity planning can be that simple, but there are a few more things you need to consider.
Even though you base your projections on one peak day, you should look at the data over a period of a few days to a few weeks.
Capacity planning can show you how busy key resources are at peak load, but it cana€™t tell you about response time changes as the load increases. Load testing is the art of creating artificially generated work that mimics the real work generated by the real users.
Load tests depend on good performance monitoring to keep an eye on critical system resources as the load builds. For a load test to be really useful it must test the entire part of the transaction path that you care about.
Load testing can also help you find where subsystems break, and isolate the effect of one transaction type. Load testing can tell you many interesting things, but it can only give you data on the computing infrastructure you have now. If you need to predict a future that is different from your present, then you need to model.
When your boss asks you to predict future performance of some application, first see if you can do a simple capacity plan.
This model of Hurricane Irene is accurate enough for anyone with a house on the Gulf of Mexico and it looks hopeful for Floridaa€™s Atlantic coast as well. In a computer context, imagine your model shows that at peak load this servera€™s CPU is 20% busy. Unfortunately, the above model of Hurricane Irene, at that moment, could not see far enough into the future to predict the devastating flooding Irene would cause in my home state of Vermont. If you respect these limits, modeling is doable, useful and has its place when you are asking questions about the future.
This chapter shows you how to gain confidence you will make it smoothly though a projected future peak load by scaling up your current observed load. This chapter gives you practical advice on how to load test an existing application to see if can really handle the upcoming peak. This chapter dispels the myth of modeling complexity and shows how modeling performance can save you a lot of time and money. This chapter teaches you how to present your results so that they are understood and are believable.
This book is concise, useful, and occasionally funny.A  It gives you the tools needed to explore, and discover the hidden truths about your computing world. Unfortunately, the above model of Hurricane Irene, at that moment, could not see far enough into the future to predict the devastating flooding Irene would cause in my home state of Vermont.A  All models have limits. Twinkie the Jack Russell terrier just broke a Guinness World Record and the video is fantastic to see!

The talent of balloon popping runs in the family as Twinkie's mom Anastacia broke the record twice, once in 2005 and again in 2008. A 17-year-old Chinese Crested Chihuahua with legs bowed out like a frog and an oozing sore won this year's World's Ugliest Dog contest. This puppies paddling like crazy when he suddenly realizes he can touch the bottom and just walk! Turns out he lost his own dog a year ago and wanted to show the dog love because he wants a dog just like him someday. After hearing Bretagnea€™s story and learning that her 16th birthday was coming up, there was no question in our minds that she deserved a Doga€™s Best Day for the ages. To celebrate her birthday and thank her for her incredible service, we were honored to team up with the dog-lovers at 1 Hotels to bring this New York City hero and her mom back to the city for the ultimate Doga€™s Best Day.
Around two dozen firefighters lined the sidewalk as Bretagne was brought into the veterinarian's office Monday.
Bretagne was 2 years old when she and her handler, Denise Corliss, were part of the Texas Task Force 1 sent to the World Trade Center site in Lower Manhattan after two hijacked airlines brought down the Twin Towers. Hopefully they have this patented, because I think we may have a million dollar idea on our hands. I just sat down with my boy and tried to do the clipping with a guide but his hair was too long so I just grabbed the clippers and started buzzing.
Thank god at a small get together was my friend, Jen- who runs a few petsmarts and is amazing with animals and my friend Jesse-who is a beautician. A are one option; these are vests that help calm your dog in many different situations that can cause anxiety. Meet Ollie, the Dog Who Was Being Euthanized When His Life Was Saved At the VERY Last Moment! With the encouragement of my family, I checked myself out of that hospital and went to another in the area to see if by the grace of God they could help me.
If you answered yes, did you also feel the need to lick a frozen light pole to see if your tongue really would get stuck? A Let them play but if they do something that borderlines on dumb but won't really hurt em, let em go for it. Everything (hardware, operating systems, networking, applications, users, corporate goals, org charts, priorities, and budgets) changes over time and with change comes new performance challenges. It will continue to be useful 100 years from now when todaya€™s technology, if it runs at all, will look as quaint as a mechanical cuckoo clock.
They help you make sense out of the performance meters you do understand and help keep you from making big mistakes.
It shows you how to use the scientific method to decipher what they mean and how to find patterns in the raw data. This rapidly focuses your companya€™s full and undivided attention on the small part of your computing world (System Z) that is causing the performance problem. Now, the right experts can be consulted and business decisions can be made to fix or work around the problem.
I spent about 15 of those years also doing performance work on live systems and critical applications for customers around the world.
Ia€™ve had plenty of practice in my standup teaching as well as when working with customers. Back in the 70a€™s he wrote this wonderful little book about repairing literally any bicycle. It usually includes dealing with immediate performance problems or collecting data that will be used by the other three tools to plan for future peak loads. Without these three things you can only solve the most obvious performance problems and have to rely on tools outside the scientific realm (such as a Ouija Board, or a Magic 8 Ball) to predict the future.
If you have a good sense of what is normal for your situation, then any abnormality will jump right out at you in the same way you notice subtle changes in a loved one that a stranger would miss. Your meters should be running all the time (like bank security cameras) so that when weird things happen you have a multitude of clues to look at.
Assuming you know how many guests will show up and have a reasonable understanding of what they will consume, everything you checked should be fine. Almost any day will do, as long as the system load is high enough to clearly differentiate it from the idle system load.
In most situations, people tend to value application stability more than the money they will spend to solve the problem with more hardware.
This gives you a clear picture where the usual daily peaks are and if there are things going on at odd times that you have to factor into any changes you propose. Even if you had perfect metering, doing the math would be a staggering challenge and, even, then youa€™d be gambling the business on reams of calculations. These resources take a little more work and creativity to capacity plan for, but this is completely doable. It can be done in a few days, presented in a few slides and prepared with few additional costs or risks. The overall load starts off low and then increases in stages to the point where you achieved your goal or you fail because some resource has hit a limit and has become a bottleneck. For any test you need to know how much work you are sending into the system, the throughput and response time for the completed work, and how the system resources are responding under that load. If your product is your website then you need to test from where your users are: all the way in and all the way back to where they live. If you only got half way to your goal before you hit a bottleneck, then every measured resource is going to be doing twice the work once you fix the current bottleneck.
Imagine your workload is an even mix of Red and Blue transactions, but it is the Blue transactions that really exercise some key component of your computing world.
To use a metaphor, running a race tells you about your current aerobic capacity, not the capacity you will have after six more months of training. To model, you are going to need the data you collected with performance monitoring and maybe some data from load tests.
Everyday, in companies all over the world, regular people build simple models that answer important business questions. If circumstances change so much that you lack confidence in that prediction, then try modeling. Either you can directly measure the performance of a live system under load, or you have to guess about a theoretical future situation. It doesna€™t take a genius to understand that your model could be off by a lot and the server would still have plenty of CPU power left. This chapter gives you the keys to understanding all computer performance problems and provides an important foundation for the next four chapters.
With it, and some work on your part, youa€™ll be able to solve performance problems and to walk into the CIOa€™s office with confidence. There are utilization meters that tell you how busy a resource is, there are count meters that count interesting events (some good, some bad), and there are duration meters that tell you how long something took.
A And full disclosure anything short of this dog getting legit hurt bad I'll still laugh at. A There's actual proof that if you own a pet your blood pressure levels are lower, heart disease is lower and people with pets are less likely to suffer from depression.

A I can't imagine what the dog had to go through and now this officer has to live with this for the rest of his life. How 'bout the big dog just chilling inside, probably catching up on his Soaps in his air conditioned castle, A while puppy cane (I think that's what the lady called him) is experiencing the battle of his life trying to haul half his body weight. A The dog suffers from epilepsy and needs an adults only home so she can adjust to life outside of a kennel and it seemed like no wanted to give her one till Michael Bay stepped in! The rest of the night and next day he would barely look at me and just laid around with his head down. Symptoms of anxiety can include pacing, heavy panting, shaking, hiding, and destructive behaviors. I was hospitalized for a long time and told I was a medical mystery and they had no idea what was wrong with me.
It was a young doctor who only graduated a few years ago that met with me and did extra research and remembered reading about my condition that saved my life. Some people swear by it, so I'm not knocking it, I just think some of the drinks end up looking like runny baby food. There are always things to do, things to learn, things to prepare for, and experiments to run. These patterns can tell you useful things about whata€™s going on inside the giant black box that is your computing world.
I had three majors (Wildlife Biology, Botany and Computer Science) but I have no degree as I left college when I ran out of money and got my first job in the computer industry. Mostly Ia€™ve learned from other performance wizards, programmers, system administrators and a few generally smart people Ia€™ve known. Clarity is essential when explaining to senior management that they need to spend large amounts of money.
There are many other parts that you dona€™t control, cana€™t meter, and have no clue how they do their work. Expected problems are no fun, but they can be foreseen and, depending on the situation, your response might be to endure them, because money is tight or because the fix might introduce too much risk.
The closer to the utilization limit (or the projected storm track), the more precise you have to make your model. As the commemorative plate infomercial says: a€?Collect them all!a€?A  Please dona€™t wait for perfection.
First off, your pet's digestive system may not be accustomed to eating the variety of foods that we do, and this can result in digestive upset with vomiting and diarrhea.
We most often see these types of reactions in dogs during warmer months when dogs are spending more time outdoors and coming into contact with biting insects.
I always take Teddy to the groomer but this time they were backed up for weeks and my little buddy was so furry that he couldn't even see out of his eyes anymore.
And I am not a pet groomer or hairstylist and had no business even thinking I could do it nicely. They were going to have to eventually send me home and I'd resort to outpatient care with my body literally falling apart to try to figure out what was wrong with me. I was having a life threatening severe allergic reaction to medication I was taking and he caught it!
I would arrive knowing almost nothing about their business and their problems and leave having given them a clear path to follow. An engaging style is essential when teaching multi-day classes, especially just after lunch. Furthermore, there are limits placed on you due to politics, time, budget, legal restrictions, and the tools you have available. Modeling is the only way to project the performance of an application in the design stage where there is no performance data to scale.
Start somewhere, collect something and, as you explore and discover, add this to your collection. Secondly, foods that are higher in fat may put your pet at risk for pancreatitis - a condition which can also cause severe vomiting and diarrhea, and dehydration - and an emergency trip to your veterinarian.
If you're flying with your pet, contact your veterinarian in advance to schedule an appointment for a health certificate, and other paperwork which may be needed if your pet is going to travel in cargo vs. A Leave the car running with the air on if you have no choice or you may get the cops called on you and a broken window (not to mention a viral video of you looking like an a**!
It will take me upwards of six months to fully recover, and I was out of work for eight weeks total, but I'm alive. This kid is graduating from the eighth grade and since it's an election year he does his impersonations of the presidential hopefuls and even the POTUS!
I like people and if I couldna€™t make my classes useful, interesting, and relevant, then I would have stopped teaching a long time ago.
As the commemorative plate infomercial says: a€?Collect them all!a€? Please dona€™t wait for perfection.
If you can't resist giving your pet a snack from your plate here and there - keep it limited to healthy snacks like vegetables and lean meats.
If your pet gets anxious during travel, talk to your veterinarian about safe sedatives or motion-sickness medications to administer. Typically treatment for mild cases involves administration of injectable medications to stop the allergic reaction. Finally, also check your destination and en-route stopping points for veterinary clinic information in the event that you need to have your pet seen on an emergency basis.

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