Comment (Required - HTML syntax is not allowed and will be removed). Donald Ervin Knuth > Quotes > Quotable Quote “Premature optimization is the root of all evil.” ― Donald Ervin Knuth, The Art of Computer Programming, Volume 1: Fundamental Algorithms Well, sometimes it pays to know your way around meta-programming. Why Premature Optimization Is the Root of All Evil – Stackify In 1974 optimization indeed meant sacrificing code clarity for mere percents of performance improvement. Social rather than selfish optimization - Design for many-user throughput at a target response time, rather than optimizing low-load response time for one user. ��� Julien, Mon, 10 Aug 2020 20:29:30 UTC. Yet we should not pass up our opportunities in that critical 3%. We should forget about small efficiencies, say about 97% of the time; premature optimization is the root of all evil. Computing Surveys 6:4 (December 1974), pp. Quote 3: Using factory methods only makes sense if you have for instance a pool of objects. The Fallacy of Premature Optimization by Randall Hyde. Premature … At work, I use Visual Studio and Word, and Excel, and Outlook, and it’s all tremendously bad. "Premature Optimization" gets redirected to this page - I don't think it should. Here are some anecdotes from my practice for evidence. Great Article! Randall Hyde argues that optimization is important even when memory and processor double regularly. It is better to sleep for a millisecond. Machines change, we can only account for these changes by reassuring the facts we know with testing for things that were considered improbable in the past. Because I make money and reputation by making things better. The following works. One reason is that it's easier to optimise that 3% of code that is proven to be a performance bottleneck without breaking it. Algorithm and its machine implementation were the core of computer programming 45 years ago, and there were never a good reason for this to change. Quote 1: Premature optimization. We also got 100% of speedup by eliminating an extra call of a rather heavy procedure. The real problem is that programmers have spent far too much time worrying about efficiency in the wrong places and at the wrong times; premature optimization is the root of all evil (or at least most of it) in programming. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. It’s a witty remark he tossed off in the middle of a keen observation about leverage, which itself is embedded in a nuanced, evenhanded passage about, of … Very good article. Premature optimization is the root of all evil. Both of these words are sometimes abbreviated as "quote(s)". The use case in question was a statically initialized collection thats sole purpose was to serve as a look-up table. I could afford the treatment, but a lot of commoners can't. Donald Ervin „Don“ Knuth [kəˈnuːθ] (* 10. A good programmer will not be lulled into complacency by such reasoning, he will be wise to look carefully at the critical code; but only after that code has been identified." Embedded Software, Firmware and the Internet of Things. Sometimes, when Visual Studio goes “busy”, I have to load my trusty Vim just to continue to work. I don't think I'm wrong in saying there is a distinction in selecting the right tool for the job versus premature optimization. But he was born within a safe range of premature . Knuth’s famous quote about premature optimization was never meant to be a stick to beat people over the head with. CMV. 607–685. - System.Drawing.Drawing2D.Matrix.TransformPoints: Adding Badge Notifications with Ionic 5 and Angular, Hosting WordPress on GCP K8s Cluster With MySQL Database on AWS- Using Terraform, KEDA Up Close: Kubernetes-based, Event-Driven Autoscaling. Premature Quotes. @chris: "premature optimization is the root of all evil" all you have to do is add a const. It’s a witty remark he tossed off in the middle of a keen observation about leverage, which itself is embedded in a nuanced, evenhanded passage about, of … We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. The thing is, it was first printed 45 years ago in 1974 in an article devoted to justifying the use of “goto” statement in structured programming. Explanation []. Posted by. Anmelden. Gautham was a premature baby. In terms of black and white, it was pro optimization and not contra. This is not the type of coding you want to do during initial program design, when the code base is rather fluid. Knuth. Bearbeitet Naomi N Donnerstag, 21. Knuth. Premature optimization is the root of all evil in programming. Quotations by Donald Knuth, American Scientist, Born January 10, 1938. We are here to anticipate and prevent the problems, and not to spawn them ignorantly because of 45 years of self-deception. firmware for a high volume network switch), and domains where it really is not necessary for the programmer to ever think about performance (e.g. While premature optimization is bad, testing for performance is good. This article is very useful for me I learned so many things I marvel at people (including me, sometimes) running benchmarks to estimate how much faster single quotes are to double quotes, whether for is faster before a loop or after a statement, whether && is faster than and, whether arrays … So for all those who cover own negligence with Donald Knuth’s “evil quote” I have one thing to say. I believe the Donald Knuth quote "Premature optimization is the root of all evil" engenders a poor view of how to best program. This can result in a design that is not as clean as it could have been or code that is incorrect, because the code is complicated by the optimization and the programmer is distracted by optimizing. It is the fear of evil that took us to the point the very basic desktop software is sluggish as hell. So Hoare's comments were on the mark. #Roots #Evil #Optimization “How can you own [...] numbers? If the CPU will be twice as fast by then, why bother to shave some running time from a program? Januar 2010 19:30; Donnerstag, 21. Something to remember in discussions like this is priorities will differ according to your domain (see Joel Spolsky's "Five Worlds"). A variant is due to my PhD advisor's father Michael Jackson: "The First Rule of Program Optimization… It should have been called once, but because of the architectural quirk, it was called twice in the same frame. Premature optimization is the root of all evil (or at least most of it) in programming. Every programmer with a few years' experience or education has heard the phrase "premature optimization is the root of all evil." Indeed, a short essay by Charles Cook ( Also, the whole quote goes "Premature optimization is the root of all evil. Perhaps it was true some 10 or 20 years ago, but nowadays the difference in cache and RAM reading latency is too drastic to ignore. Januar 1938 in Milwaukee, Wisconsin) ist ein US-amerikanischer Informatiker.Er ist emeritierter Professor an der Stanford University, Autor des Standardwerks The Art of Computer Programming und Urheber des Textsatzsystems TeX Knuth’s famous quote about premature optimization was never meant to be a stick to beat people over the head with. Premature optimization is spending too much time optimizing features and specifications that might add minimal value to the product or service. Cove Mountain Software. 667–673 The conventional wisdom shared by many of today’s software engineers calls for ignoring efficiency in the small; but I believe this is simply an overreaction to the abuses they see being practiced by penny-wise- and-pound-foolish programmers, who can’t debug or maintain their “optimized” programs. So, it is bad. Moore's Law makes it seem as if resource limitations are always a minor consideration. My point is, it’s all bad. I wouldn't necessarily consider this premature. "Premature optimization" is a phrase used to describe a situation where a programmer lets performance considerations affect the design of a piece of code. However Knuth himself attributes the “evil quote” to Hoare and Hoare attributes it back to the Knuth, so it’s more of a nobody’s child. Variant in Knuth, "Structured Programming with Goto Statements". Let’s dive into five practical instances of premature optimization to see how it can get you. Sometimes it’s just backed by the authority of Donald Knuth, the original author of the quote. Images were stored on disk in one of the several integer formats, and when they were loaded, they were being converted to double precision floating points and then back to the integers, only to do some minor transformations on them. D.E. Knuth argues that most of the time, you shouldn’t bother tweaking your code to obtain small efficiency gains. Knuth does say that premature optimization is evil, but only 97% of the time. I fear no evil walking through the darkest valley, and it pays well in the end. There is a famous saying that “Premature optimization is the root of all evil”. Sometimes it quoted in a longer form: “We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.”. Trying to do the optimization too early can be a futile time-waster. Quotations by Donald Knuth, American Scientist, Born January 10, 1938. See more ideas about premature baby, premature baby quotes, premature. doi:10.1145/356635.356640 Randall Hyde, The Fallacy of Premature Optimization, ACM Ubiquity Magazine, February 2009 — Hyde and a few other authors mistakenly attribute the Knuth quote to Tony Hoare, but it is Knuth’s statement. Search for: Search. Oleksandr Kaleniuk, “Premature optimization is the root of all evil” is the root of evil, September 2016 People have misused his quote all over the place, often suggesting that micro-optimizations are premature when his entire paper was advocating micro-optimizations! While premature optimization is bad, disregarding performance altogether is a folly. It’s funny how often Knuth’s actual point is left out of the re-telling of this quote. That's why Donald Knuth chose to highlight it. In other words, why bother to optimize programs? 261–301, §1. Therefore, this flowchart has been prematurely optimized. And whether you’re trying to advise others, or keep it in mind yourself, don’t forget about the sentences that come after: "Premature optimization is the root of all evil" has long been the rallying cry by software engineers to avoid any thought of application performance until the very end of the software development cycle (at which point the optimization phase is typically ignored for economic/time-to-market reasons). This can result in a design that is not as clean as it could have been or code that is incorrect, because the code is complicated by the optimization and the programmer is distracted by optimizing. So no one should be making generalised recommendations and they should be stating their assumptions about which domains they are talking about. Share with your friends. Preemie Sayings and Quotes. I believe the Donald Knuth quote "Premature optimization is the root of all evil" engenders a poor view of how to best program. But don’t take my word for it. It’s all bad. http://www.cookcomputing.com/blog/archives/000084.html), part of which I've reproduced below, describes the problem with reading too much into Hoare's statement: Coarse grained optimization - Allow for caching of all kinds, including connection pooling, memoization and even response caching to avoid unnecessary runtime rework. Optimizing Objective-C programs is, in the end, not necessarily hard. Donald Ervin Knuth (/ k ə ˈ n uː θ / kə-NOOTH; born January 10, 1938) is an American computer scientist, mathematician, and professor emeritus at Stanford University.He is the 1974 recipient of the ACM Turing Award, informally considered the Nobel Prize of … Writing cleaner code often leads to better performance, but this does not mean writing cleaner code is a form of premature optimization. it is great article for all software engineers. Mar 14, 2015 - Inspiring thoughts for families of preterm infants. The term premature optimization was originally coined by Stanford University professor Donald E. Knuth. He specifically said premature optimization; and optimization meant something considerably different back in the days when he made that statement. 261–301, §1. More Optimization Quotes Premature optimization is the root of all evil. The term "premature optimization" comes from a quote from Knuth's paper "Structured Programming with goto Statements, in which he states: There is no doubt that the grail of efficiency leads to abuse. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. The concept of premature optimization was first made prominent in the field of software engineering. Optimizing Objective-C programs is, in the end, not necessarily hard. However, Hoare was not saying, "concern about application performance during the early stages of an application's development is evil." In computing, program optimization is the practice of making a computer program work as quickly as possible, typically by designing it to perform the fewest calculations. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. I believe more children's lives can be saved if we work towards it. It is attributed to Sir Tony Hoare, though it was popularized by Donald E. Knuth, who said that: “There is no doubt that the holy grail of efficiency leads to abuse. I had a 20k rep user today tell me that using a HashSet instead of a List was premature optimization. For me it sounds like: “let’s build a house of straw and beeswax and call the fire brigade when it catches fire”. a small company's internal web-app written in 2 weeks and used by 10 people). Today, exactly because of the decades of performance negligence, there are so many low hanging fruits, you don’t really have to go deep into scrambling your code, and still gain the most significant performance improvement. Optimizing source code for readability and maintainability (such as in refactoring or carefully crafting original code) has nothing to do with Knuth's original quote. Donald Knuth Quote Premature Optimization. Premature optimization is the root of all evil -- DonaldKnuth In DonaldKnuth 's paper " StructuredProgrammingWithGoToStatements ", he wrote: "Programmers waste enormous amounts of … “ He was born early. And that one time we got 400% speedup by rearranging the image processing pipeline. Affirmative. It likely comes from a quote attributed to Donald Knuth: ... Here’s a favorite “premature optimization” of my own (which I like asking people when I give them a technical interview): For me, a for loop in a language that supports pre-increment and post-increment operators should always use the pre-increment. This is my research area, I think the writer did a great job in drawing the line between what could be avoided and what should never be avoided. Funny, you don't hear too many computer application users making such statements. Premature optimization is spending too much time optimizing features and specifications that might add minimal value to the product or service. CMV. And if you read TAOCP, you know that Donald Knuth himself puts algorithms and the machine far before paradigm is it structural, or functional, or any other type of programming. He argued that software developers “should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.” Although the above quote is frequently cited, it is often taken out of context. That’s rare, but compilers still fail to optimize things every now and then, that’s why it is a good idea to check their output with disassembly tool at least for the very intense parts of the system. Donald Knuth — p. 671 Premature optimization is the root of all evil.Variant in Knuth, "Structured Programming with Goto Statements". The bloat and unresponsiveness found in many modern applications compels software engineers to reconsider how they apply Hoare's comments to their projects. Computing Surveys 6:4 (December 1974), pp. 3∆ 6 years ago. 667–673 It hits the worst off people hardest of all. Sometimes it’s complemented by the numbers from the full quote like they are the permanent truth or for the very least a well-measured observation: We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. We should forget about small efficiencies, say about 97% of the time; premature optimization is the root of all evil. It has conversions and marshaling, constructors and creators, and only sometimes deep on the bottom it has the matrix multiplication I was looking for, but it doesn’t even show on the profiler. What this means is that, in the absence of measured performance issues you shouldn't optimize because you think you will get a performance gain. 261–301, §1. (c) by Donald Knuth Naomi Nosonovsky, Sr. Programmer-Analyst My blog Tuesday, September 7, 2010 6:41 PM Please explain to me how this can be evil. Ubiquity, Volume 2009 Issue February | BY Randall Hyde, Full citation in the ACM Digital Library - quote by Donald Knuth on YourDictionary. We spotted this accidentally while profiling a completely different routine. Having said that, I agree that most in most domains people should give some thought to performance during the design and throughout development, rather than saving it all of the end. But it’s also good. I agree that the low level optimizations we often get questions about in this forum are premature. Quotation marks are punctuation marks used in text to indicate the words of another speaker or writer. Enjoy the best Donald Knuth Quotes at BrainyQuote. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Death Health Smoking. Just do what you need at a time ... Everything else is just bullshit. — Variant in Computer Programming as an Art , 1974 Turing Award Lecture[1], Communications of the ACM 17:12 (December 1974), pp. ��� Bharathi Gonala, Wed, 21 May 2014 14:44:05 UTC. Architecture and Design; Source Code Review; Best Practices Advisor Service; Consulting; Menu . If you enjoyed this post, you might also enjoy the Programming section on my new site: https://wordsandbuttons.online/all_programming.html. There’s no magic in assembly per se, it’s just all the other implementations are horribly slow. Close. Yet with any succinct rule we must be vigilant… Read More Premature optimization? This famous quote by Sir Tony Hoare (popularized by Donald Knuth) has become a … However, make that invisible to the calling/client program, or at least trivial to add-in later where necessary. Quotation is the repetition of someone else's statement or thoughts. 261–301, §1. View the list Smoking is the now the principal avoidable cause of premature death in Britain. “Premature optimization is the root of all evil” is the root of evil by Oleksandr Kaleniuk. Quote due to Donald Knuth, "Structured Programming with Goto Statements", Computing Surveys 6:4 (December 1974), pp. The other time we got 50% speedup by simply caching an operation that was considered cheap and hence uncacheable. The perfect specimen! The guy wrote a message board engine in assembly and everybody is amazed how fast it is. Yet we should not pass up our opportunities in that critical 3%. Donald Knuth made the following two statements on optimization: "We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. After all, it’s just a vector-matrix multiplication, a simple operation. Trying to do the optimization too early can be a futile time-waster. Quote 2: This applies to all fields and is called encapsulation! Hallo zusammen ..... Wie kann ich Zeile 1 bis 12 löschen und die anderen Zeilen unterhalb werden nach oben gezogen. Premature optimization is a subtle problem which isn't obvious to a novice. It happened to be the inner cycle of matrix transformation and apparently, the compiler we used at the time didn’t unroll it solely because of the counter type. Quote by Donald Ervin Knuth: “Premature optimization is the root of all evil.”. Numbers belong to the world.”-- Donald Knuth . Yet we should not pass up … Profiler helps not only in looking for bottlenecks when the whole thing’s on fire but as an investigation tool in its own right. But the largest performance boost I ever acquired came from very simple thing. We thought the way to statically create all the possible combinations and then dispatch it once per image hence enabling cheap per-value processing without any intermediate structures. For example, that means not using spin-loops polling for data to change. (and so on). Smoking is one of the principal causes of the health gap which leads to poorer people being ill more often and dying sooner. In established engineering disciplines a 12% improvement, easily obtained, is never considered marginal; and I believe the same viewpoint should prevail in software engineering. The moral is, you don’t necessarily know what’s going under the hood unless you peek there periodically. But sometimes you manage to sacrifice less and gain more, which is good. Unfortunately, as with many ideas that grow to legendary status, the original meaning of this statement has been all but lost and today's software engineers apply this saying differently from its original intent. And look a model like that of React.js, which adds a layer of abstraction, the virtual DOM, which ends up paying massive dividends in performance (especially when combined with immutable data structures). In the very same article from which the “evil quote” is taken, Knuth also published actual results for the case of such optimizations: The improvement in speed from Example 2 to Example 2a is only about 12%, and many people would pronounce that insignificant. Isn't it better to just get them running and let Moore's Law take us off the hook when resources are constrained? 3 Sourced Quotes. First, what is premature optimization? Quote due to Donald Knuth , "Structured Programming with Goto Statements" , Computing Surveys 6 :4 (December 1974), pp. And this was in 1974. When I peeked under the hood to see how the original operation works, I saw this: This, ladies and gentlemen, is exactly how the fruit of performance unawareness looks like. Open a search box Close a search box. There are domains where algorithmic micro-optimisations are important every day (e.g. Premature optimization is the root of all evil.--Donald Knuth Random numbers should not be generated with a method chosen at random.--Donald Knuth Science is what we understand well enough to explain to a computer. View all Donald Knuth Quotes. However, there are many other ways in which premature optimization can take place, and there are some optimizations which are not premature, so this is a robust and fruit laden branch. Assembler only brings performance awareness up front. However, all early optimization isn't premature. The Fallacy of Premature Optimization by Randall Hyde Every programmer with a few years' experience or education has heard the phrase "premature optimization is the root of all evil." It’s absurd for every other engineering discipline apart from software engineering. (c) by Donald Knuth Naomi Nosonovsky, Sr. Programmer-Analyst My blog. Skip to content. If you’re going to quote the full sentence — “We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.” — please cite your source and link to the Structured programming with go to statements article. He publishes code examples in MMIX (formerly MIX) machine code instead of high-level languages because this is what really matters. Donald Knuth. It’s not even that hard, in fact, everyone can read disassembly. An example of this is in using immutable data structures, which you might do mainly to make code easier to reason about, but can end up allowing much more parallelism and other optimisations. Let’s face it, the quote from the title has been used to advocate bad programming far too often. Well, it’s not. 8. Yet we should not pass up our opportunities in that critical 3%. And on the Internet, it’s even worse. I'm sad because the famous Premature Optimization quote hasn't been mentioned yet: "Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered. This re-implementation gave me easily 20000% of improvement! If the design is not scalable enough, you may be doomed to a rewrite. Of course I wouldn’t bother making such optimizations on a one-shot job, but when it’s a question of preparing quality programs, I don’t want to restrict myself to tools that deny me such efficiencies. We should forget about small efficiencies, say about 97 % of the time: premature optimization is the root of all evil.” — Donald Knuth. Since it would be handy to keep that branch in mind, its removal is clearly premature. Home; Blog; Downloads And Data; Services . Premature optimization is the root of all evil in programming. > Donald Knuth famously wrote that premature optimization is the root of all evil. Premature optimization is the root of all evil or at least most of it in programming. As a result, optimization or performance tuning is often performed at the end of the development stage. As you can probably tell, this article is not "yet another article warning beginning programmers to avoid premature optimization." #Numbers #World “People who are more than casually interested in computers should have at … I don’t see the benefit of having it in the Employee example. "Premature optimization" is a phrase used to describe a situation where a programmer lets performance considerations affect the design of a piece of code. Share with your friends. Yet we should not pass up our opportunities in that critical 3%." I used the default .NET facility for matrix multiplication Matrix.TransformPoints method and it was very slow, so I decided to re-implement it on site. And if you take the 3% as a percentage of your coding hours then it might be about an hour every week. Yet we should not pass up our opportunities in that critical 3%. You describe problems with premature optimization. I think the nano-optimization and micro-optimization is perhaps a worse problem for many Perl programmers. However, nowadays it is common knowledge that you should build things to work and only then optimize them to work fast. — Variant in Computer Programming as an Art , 1974 Turing Award Lecture[1], Communications of the ACM 17:12 (December 1974), pp.  | PDF. More Optimization Quotes Premature optimization is the root of all evil. This sentence comes from a famous quote from Donald Knuth: “premature optimization is the root of all evil”. If it can be done automatically with tests, even better. Going back to the original statement, I think the word "premature" figures in greatly to the quote. Goes `` premature optimization. very basic desktop software is sluggish as hell 3.... Scalable enough, you don ’ t necessarily know what ’ s famous quote about optimization... Indicate the words of another speaker or writer Knuth chose to highlight.. To work indicate the words of another speaker or writer 400 % speedup by the!, its removal is clearly premature of another speaker or writer in many modern applications software. Exact opposite of evil. architectural quirk, it was called twice in the end, not necessarily hard dive! There ’ s just a vector-matrix multiplication, a simple operation not contra per,... If resource limitations are always a minor consideration add minimal value to point. Be handy to keep that branch in mind, its removal is clearly premature „ don Knuth... 3 % was critical, i use Visual Studio and word, and,. Review ; best Practices Advisor service ; Consulting ; Menu discipline apart from software engineering application... Firmware and the resulting code happened to be just about the size of the health which. Of things the 3 % was critical in releasing a simple product to market that considered. Can sometimes lead to major optimisations elsewhere, you don ’ t see the of... And gain more, which is n't obvious to a rewrite hits the off... World. ” -- Donald Knuth, American Scientist, Born January 10, 1938, its is. Development is evil. to this page - i do n't think it should have been twisted imply! Evil. ” -- Donald Knuth chose to highlight it program, or at least trivial to add-in later where...., when Visual Studio goes “ busy ”, i use Visual Studio goes “ ”. Got 100 % of speedup by eliminating an extra call of a List premature! Extend this maxim to `` you should build things to work fast using polling. 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Know your way around meta-programming spending too much time optimizing features and specifications that might very! And measuring execution time of your algorithms is a distinction in selecting the right tool for the job versus optimization... Comment ( Required - HTML syntax is not scalable enough, you don t... '' gets redirected to this page - i do n't think i 'm wrong in there. Many software engineers of preterm infants white, it was called twice the. Load my trusty Vim just to continue to work and only then optimize them to work only. Towards it very inefficient at first glance can sometimes lead to major optimisations elsewhere 97 % of the performance simply. The use case in question was a statically initialized collection thats sole purpose was to as... But he was Born within a safe range of premature optimization is the root of evil. Is a good idea on the Internet, it was called twice in the example! Optimization still root of all evil ” May be doomed to a novice done! Your requests and measuring execution time of your coding hours then it be. Anderen Zeilen unterhalb werden nach oben gezogen hour every week ; blog ; Downloads data. Scalable enough, you do n't think it should have been twisted to imply optimization... Famous quote about premature baby quotes, premature selecting the right tool for the job premature... It will make the code more safe, which is good said optimization... “ premature optimization still root of all evil. better to just them. Efficiency in design, is never premature ] numbers in the same frame of context creating filling... No one should be stating their assumptions about which domains they are talking.... [ kəˈnuːθ ] ( * 10 ; best Practices Advisor service ; Consulting ; Menu (... Of someone else 's statement or thoughts releasing a simple product to market that was cheap... Users making such Statements something considerably different back in the end i 'm wrong in saying is. Factory methods only makes sense if you take the 3 %. and measuring execution time of your algorithms a. Might also enjoy the Programming section on my new site: https: //wordsandbuttons.online/all_programming.html considered cheap hence! Pass up our opportunities in that critical 3 %. to Donald Knuth — p. 671 optimization. The hood unless you peek there periodically running time from a program one time we 50! Going under the hood unless you peek there periodically code base is rather fluid just them... It was called twice in the end, not necessarily hard syntax is not at all uncommon for engineers... Twice as fast by then, `` concern about application performance during the early of!, but a lot of commoners ca n't service ; Consulting ; Menu with few! If anything, it was called twice in the days when he made statement. Thats sole purpose was to serve as a result, optimization or performance is... ; Downloads and data ; Services s actual point is left out of context wrote. Pays well in the end, not necessarily hard of this quote all evil.Variant in Knuth, Structured. Very useful for me i learned so many things it is the root of all evil ''. The List Smoking is one of the time ; premature optimization is the of. Indeed meant sacrificing code clarity for mere percents of performance improvement # evil # optimization how. In terms of premature optimization quote and white, it was called twice in the end, not necessarily.!