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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. Inventor of popular inner ear monitors, Steven Ambrose, posted an open video explaining how his newest improvement could keep Brian on the road with the band.
Chili Peppers have been teasing new music since late last year and they're finally delivering.
Steven Tyler is going on tour this summer without Aerosmith, but you'll still hear your favorites from the band from Boston. In this extended interview clip from 'Montage of Heck,' Courtney shares the moment she fell for Kurt, although she didn't leave Corgan 'til months later.
Those crossovers have been making mad bank for the owners of the Marvel-based movies since Avengers! Once a mainstay of punk and underground bands, splits where two bands show up on the same record have gone out of fashion in an age of digitally downloading or streaming songs track by track.
If you're a 20 Watt fan, your LLC curiosity will be piqued by "Laid to the Bone", "Slow Grind" and "Special Delivery".
Much like LLC reached out to 20 Watt fans by cranking up the rock dial, 20 Watt dirties up their guitar sound just a wee bit more than usual to meet LLC fans in the middle. Two days ago, news broke that FFDP was being sued by their record label who claims the guys have been dragging their feet on releasing a new album and a greatest hits record. Five Finger is confident evidence will show Prospect Park is attempting to scrape any extra cash they can from the band before they part ways with them. In case you need still need another touching tribute (this Minneapolis kid definitely does), David Gilmore worked Prince's Purple Rain guitar solo into his performance of Comfortably Numb. Over the next few weeks, we're going to get the usual finger pointing that we always do after events like these. I think it's worth revisiting this interview Marilyn Manson did after the Columbine shootings.

As if Friday wasn't awesome enough to begin with, Gojira has released a new single and full details on their new album! Steven Tyler proved just how awesome he really is by giving one fan an unforgettable night. Last week, Steven Tyler casually slipped into an interview that next year 'probably' will include a farewell tour for Aerosmith. Less industrial and heavy than previous singles from their "Black Widow" album, "Fighter" is a powerhouse track all the same, showcasing Maria Brink's top notch vocals. Guns N' Roses fans panicked after we heard Axl had broken his foot just one show into their tour. The band Spirit, who played festivals with Led Zeppelin before Stairway to Heaven was release, believes Zeppelin ripped off some of their music. A judge just ruled that there's at least enough evidence to put the case in front of a jury. Luckily, March also brought a ton of kick ass metal to listen to while I shoveled out my sidewalk and driveway over, and over, and over, and over again. If , at the beginning of the year, you had told me that one of my favorite records of 2016 would come from Metal Church, I wouldn't have believed you for a second. With all due respect to the late David Wayne, I didn't discover Metal Church until "Blessing in Disguise", so Mike Howe was my guy. Axing Alexandria had been trending to more "radio-friendly" stuff over the last couple records.
With Danny Worsnop out, and new lead singer Denis Stoff in, Axing Alexandria throw us one HELL of a bone! As much as I enjoyed AA's earlier work with Danny, I look forward to more kick ass music with Denis on the mic. Now that the full length album, "Tango Umbrella", is out, I can tell you it was definitely worth the wait! Provided the guys can avoid the demons that brought them low in the past, "Tango Umbrella" is one hell of a launchpad for a new generation of AHC fans, and an affirmation to longtime fans that their band is back and ready to BRING IT! Said child abuser is the top running back in the NFL, yet they couldn't find the post-season with a search warrant. As if they couldn't suck enough, who's playing the first show at their new stadium on August 20th? Anyway, Amon Amarth has reached a Testament-like level of reliability when it comes to quality music. Minnesota may fail to bring glory to the good name "Viking", but at least Amon Amarth is here to pick up their purple and gold slack! As one of the founding fathers of metalcore, KSE is the very definition of "often imitated, never duplicated". Luckily, we have a comments section below where you can show mad love for your favorite stuff. DISCLAIMER: All Images are used for identification in the context of critical commentary of the work for which it serves as cover art.
Fair use of these images within the context of criticism and comment are covered under Section 107 of U.S. It's good thing Vince Neil has all that cash saved up from the Crue farewell tour, because his latest incident might get him sued. It has been reported by TMZ that Vince Neil was cited with battery following the alleged incident.
After waking up from an operation, and still hopped up on anesthesia, this kid tells his mom that he and "his boy, Rocco" killed people in Dubai.
Officials in Jackson, Mississippi, finally took action after residents threw a birthday party for a big pothole. 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 useful answer is: accurate enough to answer your question with a reasonable margin of safety. The Dirty Spliff" is the perfect stepping stone for fans of one band to get into the other, and a nice intro for people who are new to both bands. A It'll may take you a few minutes to get acquainted with the guitar tone, but once you get there, you're good. A I had very high hopes for what I was going to hear on this split, and my hopes were met and then some!
Anthony, a 23 year old with Down Syndrome, was in a medical supply store in Niagara Falls with his mom when he spotted his idol. Priest is back in the studio working on the follow up to 'Redeemer of Souls.' What do you think are the odds they'll throw an acoustic track on there?
A farewell tour is something that Aerosmith has been talking about for the last five years, BUT as a future 'one day' event. A That said, if Disturbed can go number one with a similar arrangement on Simon and Garfunkel's "Sound of Silence" maybe Brink and Co. The one positive to the Foo Fighters being on hiatus, is that Dave doesn't need the concert throne he used after his injury. Sales figures, airplay, buzz, and whether the album is something that's actually interesting to listen to, are all figured in. A There's more than enough heavy on this record for old school fans to give the new AA a shot. A They were in the beginnings of a reuniting the band after taking a couple years off to work out some personal issues. A You're booking a bunch of metal bands to open your new stadium, and you neglect to book THE MOST VIKING BAND EVER?!?!?!? A Just when you think they couldn't possibly add a new wrinkle to their Viking-metal awesomeness, they go and kill it again! A If you're going to buy one metalcore record this year, buy it from the band that continues to show theirA descendants how it's done. It makes a significant contribution to the user's understanding of the article, which could not practically be conveyed by words alone.
Your mom, little sister, girlfriend, your bald middle aged math teacher, and anyone who is not a fan of Slipknot. The Arizona student, who attended Red Mountain High School, exposed his genitals in his high schoola€™s varsity football team photo after being dared to do so by a teammate. 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.
This could be a simple case of them not caring about doing a good job, but my more charitable assessment is that he had no idea what a€?normala€? was, so everything the register told him had to be taken at face value. This can save your bacon because if you spot the unexpected utilization before the peak occurs, then you have time to find and fix the problem before the system comes under a peak load. You will want to search this data by time (What happened at 10:30?), so be sure to include timestamps.
However, even if you miss something, you are still better off having planned for reasonable amounts of the key resources.
Ia€™m very sure the CIO looking at all this complex math would feel very uneasy betting his or her job on these calculations. If you need more confidence in your plan, or you need to hold the response time down to a reasonable level, or if the future you are planning for includes significant changes to the transaction mix or vital systems, then you need to do either Load Testing or Modeling. When that happens, throughput stops increasing, response times climb to an unacceptably painful place and things break. If you (and your boss) only have responsibility for a small subset of the entire transaction path then thata€™s all you really need to test. So take all the peak measurements and double them to get a good idea of what you are likely to run out of as you push the test to the goal load. Create a load test that sends in all Blue transactions and you can collect the data you need without the interference of the Red transactions.
Examples of big changes that preclude simple capacity planning might be things like, large application or middleware changes or a big change in the incoming workload. 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.
He wants you to know why he wrote "Dream On." What events lead up to him penning "Sweet Emotion?" You'll find out if you catch his solo tour.
You probably also know that before Kurt, Courtney was dating Pumpkins frontman Billy Corgan. A Splits are all about reaching out to fans of the band with whom you're sharing the split. A Their genre designation as "Death Blues" shines through the second their drummer Mitch roars like a beast. The band says Prospect Park kept pushing them to tour and make new albums, so the label would make more money.
A And for the record, Oli is a supporter and member of PETA, vegan and an avid dog rescuer. A They handed me an EP called "Shoot", and told me, "This is where we're headed musically now. The image is placed in the infobox at the top of the article discussing the work, to show the primary visual image associated with the work, and to help the user quickly identify the work and know they have found what they are looking for. The photo was then published in the schoola€™s yearbook a€” somehow without a single person noticing. 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.
A Where LLC takes the rock arrangements to a different level is with a sick, SICK, guitar tone. Use for this purpose does not compete with the purposes of the original artwork, namely the artist's providing graphic design services to music concerns and in turn marketing music to the public. 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.

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