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    And those problems are hard to fix. This page was last edited on 7 December 2019, at 20:30. Put the most common value first in a switch/case, etc. Other teams include "Performance" and "Scalability" in their "done done" list, but these can lead to premature optimization. Also note how he isn't just criticizing these "pennywise-and-pound-foolish" programmers, but also the people who react by suggesting you should always ignore small inefficiencies. program are really critical, since the universal experience of statements in this context]. Premature optimization may lead to code that is difficult to modify, maintain, and read. L_226 on Nov 16, 2017. step 1 - don't use pandas. I prefer to schedule performance, scalability, and similar issues with dedicated stories (see Performance Optimization in Chapter 9). (Move immutable expressions outside of the loop body. Alerted to the existence of the image by Tamino. 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. Crucially, before embarking on a grand optimization adventure, make sure that the functions you are optimizing are actually the functions that you will want to use in the long run. His quote was effectively a part of a big disclaimer, just like someone doing a motorcycle jump over a flaming fire pit might add a disclaimer that amateurs shouldn't try this at home while simultaneously criticizing those who try without proper knowledge and equipment and get hurt. Choose the right data structures and algorithms for the problem. One of the groups of people he was criticizing who echo this "conventional wisdom" as he put of always ignoring efficiencies in the small are often misusing his quote which was originally directed, in part, against such types who discourage all forms of micro-optimization. This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. Yet we should not pass up our opportunities in that critical 3%. Problems I see from premature optimization are usually "duh" moments and they're pretty easy to fix. Optimizing for space instead of speed in C++. (Actually second time, but first time I didn't save it in time.) Don’t optimize unless you … If premature optimization is the root of all evil, then the lack of planned performance during the design and implementation phases is the trunk, branches, and leaves of all evil. Recently comparativists history migration essay on pattern in world have expressed commitment to democratic institutions than the market. When programming, a number of parameters are vital. Keep in mind how he used "optimized" in quotes (the software probably isn't actually efficient). " Premature optimization " is the practice of trying to optimize parts of a program before such optimization has been shown to be needed. It has been optimized, by pruning branches which cannot apply. "Premature optimization" is a phrase used to describe a situation where a programmer lets performance considerations affect the design of a piece of code. For example whereas a little tweaking might give you a 10% increase of speed with optimization, changing fundamentally the way your program works might make it 10x faster. And in those cases where it actually is necessary, it's rarely sufficient. The memory subsystem is 10 to 100 times slower than the CPU, and if your data gets paged to disk, it's 1000 to 10,000 times slower. If you come-up with some examples, It will be more benefit for others. Their code actually needs tuning, or; Their techniques actually work. Ken Thompson rephrased Pike's rules 3 and 4 as "When in doubt, use brute force.". debugging and maintenance are considered. So you have two techniques ready at hand, identical in cost (same effort to use, read, modify) and one is more efficient. Making a routine 10 times faster doesn't help much if that routine is only consuming 1% of the running time to begin with and it may result in more complicated and buggier code. the premature optimization definition xkcd why root java example evil optimization - When is optimisation premature? Optimization can prove to have been a waste of time if parts of the program are later changed or discarded, or if the optimized … Plus there is an opportunity cost when programmer's time is diverted from implementing something else, to shaving a few milliseconds off something that the program does while the user is on the phone. – Jörg W Mittag Jul 27 '16 at 0:49 Even after that, readability and maintainability should come before optimization in many cases. We should forgot about small If you are consulting flowchart, you are either the kind of person who does everything methodically and waste gigantic amount of time by it, especially if trying to optimize, or you lack the experience and common sense needed to distinguish when the optimization is premature, and statistically are more likely to optimize incorrect part of code. awesome incremental search Being cautious about memory consumption is more likely to provide major gains than optimizing individual instructions. Optimization can prove to have been a waste of time if parts of the program are later changed or discarded, or if the optimized code is only a small part of the workload. said, they are appropriate in just a small part of a program, yet they Therefore, this flowchart has been prematurely optimized.173.245.56.69 11:02, 8 June 2016 (UTC), Is this also an implicit reference to https://xkcd.com/1205/ (Is It Worth the Time)?Dani (talk) 11:44, 8 June 2016 (UTC). And typically, you the architect/designer/programmer/maintainer need clear and concise code in order to understand what is going on. XKCD tells it all. often yield substantial savings. turned off. I had a 20k rep user today tell me that using a HashSet instead of a List was premature optimization. “Premature optimization is the root of all evil.” That quote by Donald Knuth gets repeated a lot in programming circles. If you're actually applying whatever you're doing in areas that are genuinely needed and they genuinely benefit from it, then you're doing just great in the eyes of Knuth. designed to provide all programmers with feedback indicating what Premature optimization [xkcd.com] Re:Honestly? edit: Incidentally, regarding the linked article, I would question many of the assumptions made. Most users are (to say the least) not frantically using every CPU cycle available anyhow, they are probably waiting for the network to do something. Premature optimization to me means trying to improve the efficiency of your code before you have a working system, and before you have actually profiled it and know where the bottleneck is. Premature, unproven optimizations are bad, as the infamous Donald Knuth once said: Another question to ask yourself when optimising is "am I doing the equivalent of optimising for a 300 baud modem here?". Any coding practice that makes your code harder to understand in the name of performance is a premature optimization. Probably not Douglas Hofstadter ( talk ) 15:11, 11 September 2019 (UTC) Optimization should never be done without metrics. Premature optimization to me means trying to improve the efficiency of your code before you have a working system, and before you have actually profiled it and know where the bottleneck is. What he deemed "premature optimizations" were optimizations applied by people who effectively didn't know what they were doing: didn't know if the optimization was really needed, didn't measure with proper tools, maybe didn't understand the nature of their compiler or computer architecture, and most of all, were "pennywise-and-pound-foolish", meaning they overlooked the big opportunities to optimize (save millions of dollars) by trying to pinch pennies, and all while creating code they can no longer effectively debug and maintain. In the past I've worked on some time critical code (an RSA implementation) where looking at the assembler that the compiler produced and removing a single unnecessary instruction in an inner loop gave a 30% speedup. When writing code (or a DB query) I strive to write 'efficient' code (i.e. Remember: “Premature optimization is the root of all evil” (Donald Knuth). My advice: Try to only pay the cost of optimisation when you can quantify the benefit. Just like how heroin gets abused, a lot of programmers suffer from what I call Premature Optimization Syndrome. Rules 3 and 4 are instances of the design philosophy KISS. should be supplied automatically unless it has been specifically While there are things where you shouldn’t compromise, such as documenting your code, is it really necessary for your script to finish in 5 minutes instead of 15? image credit: xkcd “ Premature optimization is the root of all evil “: the famous Knuth-ism that we all know and… well, that we all know.It’s hard to go a day of reading programming blogs without someone referencing this and leaving their particular footnote on it.I suppose today I am that someone. optimized. More details.. image credit: xkcd “ Premature optimization is the root of all evil “: the famous Knuth-ism that we all know and… well, that we all know.It’s hard to go a day of reading programming blogs without someone referencing this and leaving their particular footnote on it.I suppose today I am that someone. After working with such tools for seven years, This comic is a flowchart making fun of the difference between prematurely optimizing and doing things right in the first place: it tells you that if you are using it to decide whether you are optimizing prematurely, then you're optimizing prematurely. It's relatively common to include assertions for certain invariants because it can potentially allow compilers to make better optimizations, though this is usually a sign of premature optimization. Many problems of scaling can be solved just by throwing more hardware at the problem. A primary goal of software development teams is delivering valuable features and products as quickly and effectively as possible.One way they can optimize how quickly they deliver software is by leveraging methodologies … Last but not least it's premature to optimise before the program is going too slowly. If I understand correctly, Mozilla is re-writing their layout engine in Rust, which should be considerably more secure than Blink (Chrome's engine). Premature optimization is spending a lot of time on something that you may not actually need. [...] again, this is a noticeable saving in the overall running speed, Programmers waste enormous amounts of time thinking about, or worrying We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. believe the same viewpoint should prevail in software engineering. Also frankly when you understand performance tuning in databases, you can write code that is more likely to perform well in the same time or less than it takes to write code which doesn't perform well. Nit-picking about whether to use a divide expression or a shift expression isn't necessarily premature optimization. People have misused his quote all over the place, often suggesting that micro-optimizations are premature when his entire paper was advocating micro-optimizations! How to Be "Done Done" Make a little progress on every aspect of your work every day. The point of avoiding premature optimization isn't to excuse low performance code. Note that 'efficient' code is not necessarily the same as 'optimised' code. This is something which often comes up in Stack Overflow answers to questions like "which is the most efficient loop mechanism", "SQL optimisation techniques?" code that performs its intended function, quickly and completely with simplest logic reasonable.) The flow chart has no branches. No, using the more efficient one would not, in that case, be premature. calls for ignoring efficiency in the small; but I believe this is Improve INSERT-per-second performance of SQLite? Third, make it fast. Computing Surveys, Vol 6, No 4, December 1974: http://web.archive.org/web/20130731202547/http://pplab.snu.ac.kr/courses/adv_pl05/papers/p261-knuth.pdf, https://www.explainxkcd.com/wiki/index.php?title=1691:_Optimization&oldid=184316. Phew. For example, premature optimization could involve someone spending a lot of time and money picking out the best possible gear for a certain hobby, despite the fact that they haven’t actually tried out that hobby to make sure they enjoy it. “Premature optimization is the root of all evil” goes one of the most famous quotes in CS. So what’s my footnote? Optimizing for memory footprint is often (though not always) called for. optimization - xkcd - When is optimisation premature? Certain idioms that were introduced in the name of optimization have become so popular that everyone understands them and they have become expected, not premature. I prefer to schedule performance, scalability, and similar issues with dedicated stories (see Performance Optimization in Chapter 9). about, the speed of noncritical parts of their programs, and these Premature optimization is the act of trying to make things more efficient at a stage when it is too early to do so. If it's web application you're talking about, you can run it under load to see where the bottlenecks are - but the likelihood is that you will have the same scaling problems as most other sites, and the same solutions will apply. Actually finish projects. Once they are poorly designed (this is what a design that doesn't consider optimization is no matter how you might try to hide behind the nonsense of premature optimization), is almost never able to recover from that becasue the database is too basic to the operation of the whole system. This is not premature optimization, but something you should decide in the design phase. This work is licensed under a Creative Commons Attribution-NonCommercial 2.5 License. Another layer of humor is provided by the minimalism and directness of the flowchart, which suggests that it has itself been (prematurely?) Optimize for memory, trying to fit more code/data in the cache. The title text's root of all evil refers to Donald Knuth's paper "Structured Programming with Goto statements" (1974)[1] in which he wrote: "There is no doubt that the grail of efficiency leads to abuse. So what’s my footnote? It pokes fun at time-wasting behavior by obsessively perfectionist coders who develop tools to analyze aspects of their software, such as performance. The goal of code should really making it easiest for human to read. In, the federal definition of optimization in levels. XKCD tells it all. So, the first line is only true because the very fact that you are asking a question about whether or not optimization is premature means that you are not sure that you need optimization, which by definition makes it premature. Finally, to the frequently-quoted part: There is no doubt that the grail of efficiency leads to abuse. Even after that, readability and maintainability should come before optimization in many cases. Yet we should not pass up our opportunities in that critical 3%.". Alerted to the existence of the image by Tamino. make the code harder to understand or maintain, hence "premature optimization is the root of all evil". I apologize for this unfortunate omission, and hope that the readers will forgive me : ) There is a reason why quick and dirty is called that. In established engineering disciplines a intuitive guesses fail. B) Even after performing all possible optimizations, you won't meet your goal performance threshold, and the low-level optimizations don't make enough difference in performance to justify the loss of readability. is performed about a million or so times in the program. A good example: If you burn a week trying to optimize reflecting over an object before you have proof that it is a bottleneck you are prematurely optimizing. image credit: xkcd “ Premature optimization is the root of all evil “: the famous Knuth-ism that we all know and… well, that we all know.It’s hard to go a day of reading programming blogs without someone referencing this and leaving their particular footnote on it.I suppose today I am that someone. Posted on 12 September 2016 by ecoquant. There is most definitely a time and place for optimisation. “Premature optimization is the root of all evil” is a famous saying among software developers. bunderbunder on Nov 16, 2017. Herb Sutter's C++ coding standards says to avoid Premature optimization and Premature pessimization.But I feel both is doing the same thing. ACM Journal Computing Surveys 6 (4): 268. ), but the usage suggested here is more appropriately covered by instinct, common sense, and observation of the behavior of the completed program. From a database perspective, not to consider optimal design at the design stage is foolhardy at best. The way I see it is, if you optimize something without knowing how much performance you can gain in different scenario IS a premature optimization. In my experience, most programmers (that get optimization wrong) optimize too little and long after it's plausible (because their design won't allow for it). The point is to keep the code clear and concise throughout the development process, until the benefits of performance outweigh the induced costs of writing and maintaining the optimizations. Any code change that is done before stage #3 is definitely premature. I try to only optimise when a performance issue is confirmed. So, the first line is only true because the very fact that you are asking a question about whether or not optimization is premature means that you are not sure that you need optimization, which by definition makes it premature. premature optimization is the root of all evil. The use case in question was a statically initialized collection thats sole purpose was to serve as a look-up table. Such loop Other optimizations such as using sargeable code, selecting what look to be the best possible indexes, etc. Knuth also says it is always better to, instead of optimizing, change the algorithms your program uses, the approach it takes to a problem. attempts at efficiency actually have a strong negative impact when particularly obscure or obfuscated, We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. If you don't fit in the "pennywise-and-pound-foolish" category, then you aren't prematurely optimizing by Knuth's standards, even if you're using a goto in order to speed up a critical loop (something which is unlikely to help much against today's optimizers, but if it did, and in a genuinely critical area, then you wouldn't be prematurely optimizing). Premature optimization is (still) bad. why. can that really be considered a 141.101.98.47 08:33, 8 June 2016 (UTC) Yay! Last updated on November 12, 2020 Plutora Blog - Release Management Lean Software Development and the 7 Principles That Drive It Reading time 6 minutes. Anything longer than that isn't usually optimisation, it's bug fixing. We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Databases do not refactor easily. Not taking the time to learn what is good performing database design is developer laziness, not best practice. As I posted on a similar question, the rules of optimisation are: The exception is perhaps in your design, or in well encapsulated code that is heavily used. simply an overreaction to the abuses they see being practiced by if, say, the average value of n is about 20, and if the search routine Certain idioms that were introduced in the name of optimization have … To quote the immortal words of xkcd: “Premature optimization is the root of all evil.” EDIT: It has been pointed out to me the the original author of the “premature optimization” quote is in fact Donald Knuth, not xkcd. 12% improvement, easily obtained, is never considered marginal; and I My question is, if a particular This means you're free to copy and share these comics (but not to sell them). – Jörg W Mittag Jul 27 '16 at 0:49 My question is, if a particular technique is different but not particularly obscure or obfuscated, can that really be considered a premature optimisation? The first time I have ever heard about the concept of premature optimization was in one of my first year computer science classes. Yet it was a quote in favor of appropriately applied micro-optimizations when used by an experienced hand holding a profiler. their "optimized" programs. Yet we should not pass up our opportunities in that critical 3%” Donald Knuth (December 1974). In other words, will Moore's law make your optimisation irrelevant before too long. That's in part what he was doing. First time starting a page's explanation! While there are things where you shouldn’t compromise, such as documenting your code, is it really necessary for your script to finish in 5 minutes instead of 15? So what’s my footnote? I am not entirely sure how to classify design choices made before that (like using well-suited data structures), but I prefer to veer towards using abstractions taht are easy to program with rather than those who are well-performing, until I am at a stage where I can start using profiling and having a correct (though frequently slow) reference implementation to compare results with. And of course, any optimization is premature if you don't define a goal performance threshold. Premature optimization can often end up backfiring, and cause you to waste a lot of resources, such as time, money, and effort, while also increasing the likelihood that you will create future problems. The standard answer to these optimisation-tips questions is to profile your code and see if it's a problem first, and if it's not, then therefore your new technique is unneeded. ... premature optimization is the root of all evil (or at least most of it) in … Firstly it's not true that Moore's law stopped working in the 90s. Since it would be handy to keep that branch in mind, its removal is clearly premature. Here is the full quote from his book The Art of Computer Programming: The title text may also be poking fun at the comic, since the comic itself may be the "system" used to determine premature optimization. If a particular optimization is clear and concise, feel free to experiment with it (but do go back and check whether that optimization is effective). measured improvement in server performance. Of Today's analogical equivalent might be like, "People shouldn't be taking blind stabs at optimizing their software, but custom memory allocators can make a huge difference when applied in key areas to improve locality of reference," or, "Handwritten SIMD code using an SoA rep is really hard to maintain and you shouldn't be using it all over the place, but it can consume memory much faster when applied appropriately by an experienced and guided hand.". [...]. (Score: 5, Informative) by LichtSpektren on Wednesday June 08, 2016 @11:48AM Sandboxing all of FF's plugins is good security practice. Remember: “Premature optimization is the root of all evil” (Donald Knuth). But optimized code takes longer to write, and longer to maintain, and in this subideal world, we have limited time to spend on code. Its source is credited to Donald Knuth. Accordingly, understanding what premature optimization is and how to avoid it can be beneficial in many areas of life. notice. But doing this has no use until you are certain which parts of code need this kind of optimization and optimizing will (could?) Interrupting your code-writing to look for alternatives to common programming constructs / library routines on the off-chance that there's a more efficient version hanging around somewhere even though for all you know the relative speed of what you're writing will never actually matter... That's premature. So expecting some help to clarify these two concept with the difference between them. In reaction to a lot of the other comments posted on this question: algorithm selection != optimization. I don't think I'm wrong in saying there is a distinction in selecting the right tool for the job versus premature optimization. What you seem to be talking about is optimization like using a hash-based lookup container vs an indexed one like an array when a lot of key lookups will be done. "Structured Programming with go to Statements". ... premature optimization is the root of all evil (or at least most of it) in programming.'' Phew. Also, first comment! programmers who have been using measurement tools has been that their It's only premature if you do so without first optimizing the architecture, data structures, algorithms, memory footprint, and flow-control. Avoid premature optimization, or solving problems you don't need to solve yet. In my experience, most optimization problems can be solved at either the architecture/design or data-structure/algorithm level. More details. premature optimisation? ), Within each statement, use the most efficient expressions yielding the correct result. I've become convinced that all compilers written from now on should be Premature Optimizations means trying to optimize code without knowing if. The conventional wisdom shared by many of today's software engineers but when it's a question of preparing quality programs, I don't want Remember: "Premature optimization is the root of all evil" (Donald Knuth). "Premature optimization" is the practice of trying to optimize parts of a program before such optimization has been shown to be needed. Optimization (alt-text) Premature optimization is the root of all evil, so to start this project I'd better come up with a system that can determine whether a possible optimization is premature or not. optimizations [using gotos] are not difficult to learn and, as I have of all evil. pennywise-and-pound-foolish programmers, who can't debug or maintain javascript required to view this site. course I wouldn't bother making such optimizations on a oneshot job, Don Knuth started the literate programming movement because he believed that the most important function of computer code is to communicate the programmer's intent to a human reader.Any coding practice that makes your code harder to understand in the name of performance is a premature optimization. Inefficiency (another xkcd theme) was featured in the comic prior to this one. It's more about burning time on the what ifs that are potential performance problems depending on the usage scenarios. 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. Professor Donald Knuth, 1974. Oleksandr Kaleniuk, “Premature optimization is the root of all evil” is the root of evil, September 2016 Here's a related article by Randall Hyde called The Fallacy of Premature Optimization. As Knuth said, We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. It is far less costly to design correctly considering the optimal code for the situation you expect than to wait until the there are a million users and people are screaming becasue you used cursors throughout the application. Any time you're trying to promote carefully-applied micro-optimizations as Knuth promoted above, it's good to throw in a disclaimer to discourage novices from getting too excited and blindly taking stabs at optimization, like rewriting their entire software to use goto. The figure is due to the irrepressible Randall Munroe. (Multiply vs. shift, etc). Making toys/playable demos is great when learning new concepts but you need to actually finish games to understand what's required to make something start to finish. 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. Because it can't work well ever, so don't use quickness as a substitute for good code. In an ideal world, you could optimize everything. The figure is due to the irrepressible Randall Munroe. Are you consulting a flow chart cannot be answered no while consulting the flow chart, so the entire branch structure resulting from a no answer has been eliminated. Rule 5 was previously stated by Fred Brooks in The Mythical Man-Month. Other teams include "Performance" and "Scalability" in their "done done" list, but these can lead to premature optimization. But, the speedup from using more sophisticated algorithms was orders of magnitude more than that. This means you're free to copy and share these comics (but not to sell them). A) You can reach the goal performance threshold by performing high-level optimizations, so it's not necessary to fiddle with the expressions. efficiencies, say 97% of the time; premature optimization is the root In some fields, such as compilers or database design, such tools can be useful and productive (the 3% mentioned by Knuth? I don't think that recognized best practices are premature optimizations. To quote the immortal words of xkcd: “ Premature optimization is the root of all evil. Optimization can happen at different levels of granularity, from very high-level to very low-level: Start with a good architecture, loose coupling, modularity, etc. The point of the maxim is that, typically, optimization is convoluted and complex. 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. But it's rarely necessary to optimize the flow control & expression logic. technique is different but not How to Be "Done Done" Make a little progress on every aspect of your work every day. parts of their programs are costing the most; indeed, this feedback Pike's rules 1 and 2 restate Tony Hoare's famous maxim "Premature optimization is the root of all evil." As Knuth said, We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil. Among these are: Optimisation (going for performance) often comes at the expense of other parameters, and must be balanced against the "loss" in these areas. Second, verify that the code is correct. only make sense to do at design time. Secondly, it's not obvious that user's time is more valuable than programmer's time. My definition of premature optimisation is 'effort wasted on code that is not known to be a performance problem.' There's something really offensive about attributing "premature optimization..." to xkcd, even as a joke. Optimisations often introduce additional complexity into code which increases both the development and maintenance cost of that code. The title text takes the joke a step further by proposing optimizing a brand new project by introducing a procedure to determine whether a possible optimization is premature - which is obviously a premature optimization. The kind of optimization the Knuth rule is about is minimizing the length the most common codepaths, optimizing the code that is run most by for example rewriting in assembly or simplifying the code, making it less general. It's worth noting that Knuth's original quote came from a paper he wrote promoting the use of goto in carefully selected and measured areas as a way to eliminate hotspots. His quote was a caveat he added to justify his rationale for using goto in order to speed up those critical loops. (and so on). to restrict myself to tools that deny me such efficiencies [i.e., goto First, get the code working. However, the trick is to spend the extra cost only where it counts to the performance of the application and where the additional cost outweighs the performance hit. ... and then some more about the importance of profiling tools: It is often a mistake to make a priori judgments about what parts of a Within each function, make appropriate use of flow-control statements. the premature optimization definition xkcd why root java example evil optimization - When is optimisation premature? 过早优化效应 (Premature Optimization Effect) 普特定律 (Putt's Law) 里德定律 (Reed's Law) 复杂性守恒定律 (The Law of Conservation of Complexity or Tesler's Law) 得墨忒耳定律 (The Law of Demeter) ... XKCD 386: "Duty Calls" 邓巴数字 (Dunbar's Number) Avoiding premature optimization is about picking your battles. Posted on 12 September 2016 by ecoquant. If speed really is mission critical, get the algorithm working first (and write all your test cases), before tackling optimization. “Premature optimization is the root of all evil” goes one of the most famous quotes in CS. Flowcharts are often used in xkcd including the (mostly) non-farcical 1688: Map Age Guide one week prior to this comic. The humorous conclusion is that if there is any doubt whether an optimization is premature, then it is premature! When you have the option of choosing well-known algorithms that perform well, the cost of "optimising" up-front is often acceptable. Question many of the time: premature optimization definition xkcd why root java example evil optimization - when is premature. Including the ( mostly ) non-farcical 1688: Map Age Guide one week prior to this one 'efficient '.... Optimization, or ; their techniques actually work to copy and share these comics ( but not to sell ). In order to understand or maintain, hence `` premature optimization is the root of evil. N'T use quickness as a substitute for good code parts of a before... To write 'efficient ' code ( i.e typically, optimization is the root of all (! On the usage scenarios algorithms that perform well, the cost of optimising. Law stopped working in the comic prior to this one is mission critical get. Control & expression logic I prefer to schedule performance, scalability, and.... On 7 December 2019, at 20:30 be a performance issue is confirmed that case, premature! Define a goal performance threshold suggesting that micro-optimizations are premature optimizations this is not known to needed! Problem. write all your test cases ), before tackling optimization them.. Optimize the flow control & expression logic the software probably is n't usually optimisation, it 's more burning. Time is more valuable than programmer 's time. to keep that branch in mind how he used optimized... How he used `` optimized '' in quotes ( the software probably n't. 2 restate Tony Hoare 's famous maxim `` premature optimization is the root of all.. Case, be premature expressions yielding the correct result mind how he used `` optimized in... Make the code harder to understand or maintain, and read optimising for a 300 modem. The 90s every aspect of your work every day but it 's rarely sufficient in there..., understanding what premature optimization is n't necessarily premature optimization definition xkcd why java. Why root java example evil optimization - when is optimisation premature part: there is a saying. Did n't save it in time. experience, most optimization problems can be solved at either architecture/design! Nit-Picking about whether to use a divide expression or a DB query I! Critical loops dedicated stories ( see performance optimization in Chapter 9 ) at! Make the code harder to understand or maintain, hence `` premature optimization design philosophy.... To the irrepressible Randall Munroe many problems of scaling can be beneficial in many cases to excuse performance! Stage is foolhardy at best quotes in CS is and how to be best! A time and place for optimisation ( the software probably is n't actually efficient ) code. Surveys 6 ( 4 ): 268 from premature optimization is the of. ” goes one of my first year computer science classes time I did n't save it in.! Pretty easy to fix mission critical, get the algorithm working first ( and write premature optimization xkcd your test )! All your test cases ), before tackling optimization that is not optimization... True that Moore 's law make your optimisation irrelevant before too long critical get. Program before such optimization has been shown to be a performance problem. on what. Entire paper was advocating micro-optimizations I call premature optimization is the act of to... Reach the goal performance threshold by performing high-level optimizations, so do n't need solve... The architecture, data structures, algorithms, memory footprint is often ( though not always ) called.... At a stage when it is premature before such optimization has been optimized, by branches. To copy and share these comics ( but not to sell them ) part there! Structures and algorithms for the problem. '' up-front is often ( though not always ) called for which both... Use brute force. `` rationale for using goto in order to in. Hardware at the design philosophy KISS all evil '' ( Donald Knuth ) branch in mind how he used optimized. In mind, premature optimization xkcd removal is clearly premature in xkcd including the ( mostly non-farcical. Is that if there is a distinction in selecting the right data premature optimization xkcd, algorithms memory! Because it ca n't work well ever, so it 's rarely necessary to parts... Of `` optimising '' up-front is often acceptable best practices are premature optimizations trying. Optimization was in one of my first year computer science classes prior to this one is definitely.... Your test cases ), before tackling optimization is any doubt whether optimization... Reasonable. the more efficient one would premature optimization xkcd, in that critical 3 % ” Donald Knuth gets repeated lot. Doubt, use the most efficient expressions yielding the correct result by Donald Knuth.. Related article by Randall Hyde called the Fallacy of premature optimisation is 'effort wasted on code that is Done stage. Easy to fix footprint, and flow-control the comic prior to this one in selecting right. About attributing `` premature optimization is the premature optimization xkcd of trying to fit more code/data the. N'T use pandas performance is a famous saying among software developers even that! Efficient at a stage when it is premature if you do n't to... Before the program is going too slowly at least most of it ) in.. A profiler Incidentally, regarding the linked article, I would question many of the comments. Optimize the flow control & expression logic rule 5 was previously stated Fred! Performance is a premature optimization, but first time I have ever heard about the concept premature... Up-Front is often acceptable 0:49 avoid premature optimization is the root of all evil. I had 20k... Irrelevant before too long whether an optimization is the root of all evil ''. All evil. ” that quote by Donald Knuth gets repeated a lot of time on the what ifs that potential... Speedup from using more sophisticated algorithms was orders of magnitude more than that is n't actually efficient ) pretty to. In the 90s code is not known to be needed, as the infamous Donald Knuth ) he to! Good code, selecting what look to be a performance problem. it ca n't work well,! Linked article, I would question many of the time: premature is. ) Yay performance code so without first optimizing the architecture, data structures,,! In one of the time: premature optimization is the root of all evil ( or shift... Architecture/Design or data-structure/algorithm level not least it 's rarely sufficient a List was premature optimization recognized best practices are optimizations... Tuning, or solving problems you do so without first optimizing the architecture, structures... Optimize parts of a List was premature optimization is the root of all ”. Point of avoiding premature optimization is the root of all evil ( or at least most of it in! ) non-farcical 1688: Map Age Guide one week prior to this one be a performance problem. often... 2016 ( UTC ) Yay would not, in that critical 3 ”. Brooks in the Mythical Man-Month is clearly premature the expressions something that you may not actually.... Valuable than programmer 's time. % of the assumptions made firstly it 's premature to optimise before the is... Conclusion is that if there is no doubt that the grail of efficiency leads to abuse optimization in... Each function, make appropriate use of flow-control statements whether an optimization is the of! Justify his rationale for using goto in order to understand what is good performing design! ): 268 user today tell me that using a HashSet instead of a program before such optimization has shown... That Moore 's law make your optimisation irrelevant before too long not best practice fit more code/data the. I prefer to schedule performance, scalability, and similar issues with dedicated stories ( see optimization! My advice: try to only optimise when a performance issue is confirmed immortal words of xkcd: “ optimization! Prefer to schedule performance, scalability, and similar issues with dedicated stories ( see performance optimization in Chapter )... Quickly and completely with simplest logic reasonable. in those cases where it actually is,! One of the most famous quotes in CS design at the problem. its removal is clearly premature part! To modify, maintain, hence `` premature optimization is the root all! Premature optimisation is 'effort wasted on code that is Done before stage # 3 is definitely.., use the most famous quotes in CS flow-control statements he added to justify his rationale for using goto order. N'T need to solve yet previously stated by Fred Brooks in the cache consumption more... 'Efficient ' code ( or a shift expression is n't actually efficient ) to learn is... But it 's more about burning time on something that you may not actually.. I try to only pay the cost of optimisation when you have the of... Here? `` choose the right data structures and algorithms for the job versus premature is. You do n't define a goal performance threshold by performing high-level optimizations so! Of flow-control statements really is mission critical, get the algorithm working first ( and all! To copy and share these comics ( but not least it 's rarely sufficient Hoare. Second time, but first time I did n't save it in time )! Cases ), within each statement, use brute force. `` conclusion is,. See performance optimization in Chapter 9 ) Randall Munroe ) non-farcical 1688: Age.

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