Jim not that way Jim. That's no way to treat a garage door, bending stiffly down at the waist and yanking at the handle so the door jerks up and out jerky and hard and you crack your shins and my ruined knees, son. Let's see you bend at the healthy knees. Let's see you hook a soft hand lightly over the handle feeling its subtle grain and pull just as exactly gently as will make it come to you. Experiment, Jim. See just how much force you need to start the door easy, let it roll up out open on its hidden greasy rollers and pulleys in the ceiling's set of spiderwebbed beams. Think of all garage doors as the well-oiled open-out door of a broiler with hot meat in, heat roiling out, hot. Needless and dangerous ever to yank, pull, shove, thrust. Your mother is a shover and a thruster, son. She treats bodies outside herself without respect or due care. She's never learned that treating things in the gentlest most relaxed way is also treating them and your own body in the most efficient way. It's Marlon Brando's fault, Jim. Your mother back in California before you were born, before she became a devoted mother and long-suffering wife and breadwinner, son, your mother had a bit part in a Marlon Brando movie. Her big moment. Had to stand there in saddle shoes and bobby sox and ponytail and put her hands over her ears as really loud motorbikes roared by. A major thespian moment, believe you me. She was in love from afar with this fellow Marlon Brando, son. Who? Who. Jim, Marlon Brando was the archetypal new-type actor who ruined it looks like two whole generations' relations with their own bodies and the everyday objects and bodies around them. No? Well it was because of Brando you were opening that garage door like that, Jimbo. The disrespect gets learned and passed on. Passed
It's common to see the average response time of a service reported. (Strictly speaking, the term "average" doesn't refer to any particular formula, but in practice it is usually understood as the arithmetic mean: given n values, add up all the values, and divide by n.) However, the mean is not a very good metric if you want to know your "typical" response time, because it doesn't tell you how many users actually experienced that delay median response time is 200 ms, that means half your requests return in less than 200 ms. and half your requests take longer than that
Sayfa 14
In this book, we focus on three concerns that are important in most software systems:
Reliability
The system should continue to work correctly (performing the correct function at the desired level of performance) even in the face of adversity (hardware or software faults, and even human error).
Scalability
As the system grows (in data volume, traffic volume, or complexity), there should be reasonable ways of dealing with that growth.
Maintainability
Over time, many different people will work on the system (engineering and operations, both maintaining current behavior and adapting the system to new use cases), and they should all be able to work on it productively
Sayfa 6
Latency and response time are often used synonymously, but they are not the same. The response time is what the client sees: besides the actual time to process the request (the service time), it includes network delays and queueing delays. Latency is the duration that a request is waiting to be handled—during which it is latent, awaiting service
Sayfa 36
Hard disks are reported as having a mean time to failure (MTTF) of about 10 to 50 years [5, 6]. Thus, on a storage cluster with 10,000 disks, we should expect on average one disk to die per day.
Zamana yayılmış yoğun çalışmalar sonuç verir.
Intensive work spread over time yields results.
