Optimization is the process of improving an existing program to make it work more efficiently or/and using less resources.

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Minimizing use of paper

I've recently faced this problem in a dynamic programming curriculum, and I honestly have no idea about how to determine the appropriate state. You're given N (1 <= N <= 70) paragraphs and M (1 ...
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Big O(n log n) and Quicksort number of operations

I have an Array with 1,000,000 unsorted elements. I need to calculate expected number of operations that needs to be performed to sort array using Quicksort algorithm in common situations (not the n^2 ...
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480 views

Optimize strategies for xml parsing?

I am looking for general optimization tips and guidelines for xml parsing. One of the optimization strategies is of course selecting the "right" parser. A detailed comparison between the available ...
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Is it ok to replace optimized code with readable code?

Sometimes you run into a situation where you have to extend/improve some existing code. You see that the old code is very lean, but it's also difficult to extend, and takes time to read. Is it a good ...
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245 views

FxCop / Code Analysis with VS2010 Ultimate

I've getting some information about this, but I still can find a proper answer, I was asked recently in my company for this : "run a fxcop analysis on that code and tell me the results". Ok, I have ...
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314 views

How fast should a web response be?

I've heard a few times that every extra [number1] milliseconds it takes to process a web request and return a response will lose you [number2] percent of users. Is this just "conventional wisdom," or ...
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Software Optimization vs. Hardware Optimization - what has the bigger impact?

I was wondering how software optimization and hardware optimization compare when it comes to the impact they have on speed and performance gains of computers. I have heard that improving software ...
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606 views

How do I determine if my code is optimized?

I am only developer working on a project. The functionality that I have coded works to expectations(desired result) but since I am the only one I don't know if I can do anything better to it. How do I ...
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92 views

File Processing Times

I have a very simple program in Ruby that opens a dictionary file, sorted-words.txt and prints out all the words in pig-latin. I tested its speed, and the first time I ran it, the program finished in ...
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what is best book to learn optimized programming in java [duplicate]

Possible Duplicate: Is there a canonical book for learning Java as an experienced developer? Let me elaborate a little: I used to be a C/C++ programmer where I used data structure ...
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Efficient methods for storing tens of millions of objects for querying, with a high number of inserts per second?

This is basically a logging/counting application that is counting the number of packets and counting the type of packet, etc. on a p2p chat network. This equates to about 4-6 million packets in a 5 ...
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It takes me hours to completely understand solutions to 1000-pt problems on TopCoder. Should I get discouraged? [closed]

Sometimes this applies to the 500-pt ones too. I sometimes start feeling I will never improve enough to code them with ease like the others. Should I just quit? If not, why? It is extremely annoying, ...
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Optimization as a branch: is that a thing?

My company has highly optimized scientific application which has become so big and complicated that new versions are literally taking t = infinity to produce. (E.G. I have an email which ...
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6answers
2k views

How can I organize fast and comfortable solution compilation in VS 2010?

Most of programmers who are involved into development of more or less large project(s) know how annoying the process of compilation can be. There are some other things which are dependent on ...
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4answers
531 views

What factors should I consider when choosing names for identifiers?

What factors do I need to consider when choosing names for identifiers such as variables? I am concerned about space issues, i.e. extra memory consumption when choosing longer names. As an example, ...
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4answers
564 views

Approaches against code base becoming uniformly slow

We are working on a moderately-sized C++ code base (10Mloc) which through our optimization efforts is becoming uniformly slow. This code base is a set of libraries which we combine to put them to ...
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3answers
498 views

Is there a general method to evaluate the optimality of an optimization algorithm?

is there a general method to evaluate the optimality of an optimization algorithm, for example an algorithm solving an otherwise NP-hard or NP-complete problem? The only method I came up so far is ...
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4answers
950 views

Why is C++ known as 'premature optimizaton'? [closed]

"Programming in C++ is premature optimization" Why does everyone do some people say this?
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236 views

Is it possible to embed multiple programs into 1

To be more specific, let me explain my end result goal or more of what I would LIKE to have someday and then you can tell me if its even feasible and if not possibly an alternative method. I really ...
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4answers
2k views

How can I learn about optimising for the CPU cache (in C)?

Reading these two questions, I see that understanding CPU caching behaviour can be important when dealing with large amounts of data in memory. I would like to understand the way the caching works to ...
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1answer
92 views

Branding websites aimed for mobile devices [closed]

I'm currently working on a website which is also supposed to be mobile optimized. My client has provided me with a layout of how the mobile version of how the website should look like. Making their ...
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588 views

How to document and teach others “optimized beyond recognition” computationally intensive code?

Occasionally there is the 1% of code that is computationally intensive enough that needs the heaviest kind of low-level optimization. Examples are video processing, image processing, and all kinds of ...
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333 views

Which of these algorithms is best for my goal?

I have created a program that restricts the mouse to a certain region based on a black/white bitmap. The program is 100% functional as-is, but uses an inaccurate, albeit fast, algorithm for ...
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3answers
917 views

CPU Architecture and floating-point math

I'm trying to wrap my head around some details about how floating point math is performed on the CPU, trying to better understand what data types to use etc. I think I have a fairly good ...
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1answer
594 views

Include all php files in one file and include that file in every page if we're using hiphop?

I understand that in normal php if we're including a file we're merging the source of it in the script and it would take longer for that page to be parsed/processed but if we're using HipHop shouldn't ...
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616 views

Single click handler for all buttons in Javascript? Is it a pattern? Whats the benefit?

I have been told that when there are multiple buttons on the page for same purpose but targeting different item e.g. delete item on a grid of items, they say it is recommended to just register for ...
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The cross-over between designing for performance/pre-mature optimisation [duplicate]

Possible Duplicate: When is optimization not premature and therefore not evil? Whilst designing my own .Net SQL access library, I found that I want everything thing to run as fast as ...
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What is the best way to insert range of values into a datastructure

If I have a datastructure which is the fastest way I could insert values into it in a specified range? For example if I had a method: myDatastructure var=new myDataStructure(); var.insert(2,1000); ...
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Why there is no ISO hardware query interface?

I'm currently reading a book, chapter about I/O, and one question came to my mind. Basically, when you program in C/C++, you have an amazing opportunity to optimize for hardware behavior. Using ...
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How do I know if the compiler broke my code and what do I do if it was the compiler?

Once in a while C++ code will not work when compiled with some level of optimization. It may be compiler doing optimization that breaks the code or it may be code containing undefined behavior which ...
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685 views

How do I optimize a web application for high-latency users?

Basically, I have an application that does searches and requests results from a backend via long polling. It connects to the backend which collects results for 500 ms then sends them back to the ...
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291 views

Is microoptimization worth it in mobile devices?

Usually microoptimization is considered not worth it with the following explanation: it might speed up the program by less that one percent, but noone cares of that minor boost - that's just too ...
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3answers
233 views

Is it worth evaluating compiler optimization on trivial cases?

I'm currently testing Visual C++ 10 on some trivial pieces of code. For example, like this one (taken from here): int main() { int i; clrscr(); ...
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Is it an inefficient workflow to write out code and THEN go back and optimize?

I'm a newer enthusiast programmer. I've been doing small and big projects on and off for the past two or three years. I always hit small snags in my code that add up to big memory hogs or unnecessary ...
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When should I be offloading work to a GPU instead of the CPU?

Newer systems such as OpenCL are being made so that we can run more and more code on our graphics processors, which makes sense, because we should be able to utilise as much of the power in our ...
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How can I best implement 'cache until further notice' with memcache in multiple tiers?

the term "client" used here is not referring to client's browser, but client server Before cache workflow 1. client make a HTTP request --> 2. server process --> 3. store parsed results into ...
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is it realistic to make use of HTML5 local storage to store CSS, and JavaScript

The idea is to make use of HTML5 local storage to store frequently accessed CSS and JavaScript. For example (pseudo-code): var load_from_cdn = true; if (detect local storage) { if (cache of ...
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How important are PHP notices really?

I recently turned all possible error-messages on with error_reporting(-1);, on my PHP project. Of course, right away I got alot of messages. For example: Notice: Undefined variable: foo in ...
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How to best approach planning and budgeting of software performance optimization efforts?

There is a software system that has been with the client for some time now. If is feature-rich, mature, complex enterprise application that client uses in production. Due to the rapid expansion of the ...
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8answers
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How important is it for a programmer to know how to optimize code, solve complex puzzles, answer technical questions quickly?

So I'm in the process of looking for a job. And I have had plenty of test and just recently someone sent me a puzzle. It's the crackless wall problem and I have no idea how to approach it. I could ...
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30answers
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Is micro-optimisation important when coding?

I recently asked a question on Stack Overflow to find out why isset() was faster than strlen() in PHP. This raised questions around the importance of readable code and whether performance improvements ...
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2answers
439 views

How is switch/case handled as to avoid comparisons to the case values?

I've read in multiple answers that switch/case avoids "unnecessary" comparisons, but I never learned this in college, and I'm a little stumped on how the program would figure out which case to jump to ...
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elevator algorithm and implementation

I wanted to know how (real) elevators work. But, so far, I could not find much material about the algorithms they use, nor software (if any) for simulation. Could anybody give me references for that?
3
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1answer
238 views

Algorithm visualization app/plugin

I am looking for an application (or and IDE plugin) that I can use in order to test some algorithms I implement. Mainly metaheuristics used in TSP, VRP and other optimization problems. I have already ...
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How can I make my career in supply chain optimisation and data mining? [closed]

There is a company in my city which does supply chain optimization, data mining and predictive modelling. I tried hard but was not able to enter there. Now I want to do similar sort of work. They ...
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2answers
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Is this a valid smartphone CPU vs. desktop CPU speed comparison (Android G1 vs. old Pentium 4 desktop)?

I am trying to estimate speed differences when creating code on my desktop PC that will be ported to Android phones. I don't need to be exact, but a good estimation will help stop me from creating ...
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6answers
984 views

Where should code refactoring and optimization fit within both an agile and waterfall process timeline?

There appears to be this notion among the project management team that stating that "it works" means it should then be deemed 100% complete. Most programmers know that isn't always the case. If I'm ...
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Are web best practices so important if they are always violated by large companies?

Usually, there are a bunch of rules and best practices which help optimizing a website, bring new customers, and in general making user experience fast, smooth and pleasant while (sometimes) reducing ...
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4answers
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Guidelines for HTML/CSS/JS optimization process

Currently we have a Development server on which we write the HTML/CSS/JS code. We do not optimize our code using compressors/minifiers. So our deployment process from Development to Production is ...
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What are some common algorithm optimization opportunities - mathematical or otherwise

What are some common algorithmic optimization opportunities that everyone should be aware of? I have recently be revising/reviewing some code from an application, and noticed that it appeared to be ...