Optimization is the process of improving an existing program to make it work more efficiently or/and using less resources.
0
votes
4answers
103 views
Use functions inside a loop declaration
What's the best practice?
This :
for ($i = 0; $i < count($array); $i++) {
//stuff
}
Or, what I usually do :
$count = count($array);
for($i = 0; $i < $count; $i++) {
//stuff
}
Is it the ...
2
votes
2answers
98 views
Find common functionalities or functions between 2 programs
I've been facing a problem recently, in which I want to optimize two programs.
For that, I wanted to create some kind of "Common Interface" which I could reuse between my two programs.
However, the ...
1
vote
0answers
152 views
Optimization algorithm, how to develop this problem
I have a situation where I would like your input and think over / solve algorithm.
The specs
There are inventories with a specified amount of capacity. 'X
(width) and Y (time)' creates ...
3
votes
1answer
136 views
Jargon to describe unnecessary running of code?
A code works but it runs unnecessary fraction of code in many cases, still required sometimes. Things such as better preprocessing, simple stoppers and some conditional checkers would save enormous ...
0
votes
4answers
179 views
Write then optimise or write optimised [duplicate]
Do you write your code then optimise it? Or do you write an optimised code from the beginning.
I always believe in writing optimised since I really dont like to rewrite code, But please share your ...
2
votes
2answers
297 views
Which code is better for branch prediction optimization?
Given branch prediction, and also the effect of compiler optimizations, which code tends to offer superior performance?
Note that bRareExceptionPresent represents an uncommon condition. It is not the ...
2
votes
3answers
161 views
Implicit optimization versus explicit optimization
To explain what I mean, let me start with an example.
Consider a deque that supports O(logn) concatenation with another deque and O(n) addition of n elements at one end. This dequeimplements a ...
0
votes
1answer
163 views
using ant colony algorithm to create cross word game
I have difficulty to learn about ant colony algorithm (ACO), I have read about generating crossword game using (genetic algorithm) GA.I Know both of GA ant ACO usually used for optimization, but my ...
4
votes
2answers
236 views
Performance and other issues with using floating point types in C++
Being interested in C++ performance programming there is one aspect I really have no clue about- and that is the implications of using floating point calculations vs doubles vs normal integer ...
1
vote
0answers
82 views
How should I prepare myself for this internship(emphasis in optimization/webkits)? [closed]
I recently scored an summer internship with a pretty big company, but the problem is, most of my programming experience is quite constrained to personal projects and academics.
The position is for ...
3
votes
1answer
134 views
Can profiling be used to verify if optimization was successful?
I know that profiling is useful to identify bottlenecks and determining what parts of the code require how much time to execute. The latter isn't always very easy to track in the midst of other paths ...
4
votes
2answers
161 views
How can I plan optimization tasks in Scrum?
Recently my Scrum team has received several requests for optimizing certain parts of our code. Looking at the software with a profiler found some spots where the code could be improved.
We agreed to ...
1
vote
1answer
106 views
Turning n-dim points into m-dim where m<n and where point-to-point distance deviation is minimized
I want to apply k-means clustering to a (sparse) adjacency graph. For this I need to assign the nodes to a position in an euclidean space. Trivially I can do this by having a space with as many ...
4
votes
4answers
203 views
What performance topics should I be aware of? [closed]
When coding performance-critical portions of code (not necessarily large, but code that gets executed a lot), what topics should I be aware of/take into account.
I'm already fairly familiar with ...
3
votes
1answer
64 views
Expensive AOT Optimizations
I've seen it stated several times that AOT can run some more expensive optimizations that take too long to be used by a JIT. But I've never seen it stated what exactly these optimizations are. So I'm ...
3
votes
3answers
377 views
Is it conceivable to have millions of lists of data in memory in Python?
I have over the last 30 days been developing a Python application that utilizes a MySQL database of information (specifically about Norwegian addresses) to perform address validation and correction. ...
0
votes
5answers
231 views
Is comparing an OO compiler to a SQL compiler/optimizer valid?
I'm now doing a lot of SQL development at my new job where as before I was doing Object Oriented desktop app stuff. I keep running across very large scripts (thousands of lines) and wanting to ...
4
votes
4answers
253 views
Designing a Database Application with OOP
I often develop SQL database applications using Linq, and my methodology is to build model classes to represent each table, and each table that needs inserting or updating gets a Save() method (which ...
2
votes
1answer
2k views
Most efficient Implementation a Tree in C++
I need to write a tree where each element may have any number of child elements, and because of this each branch of the tree may have any length.
The tree is only going to receive elements at first ...
0
votes
6answers
683 views
Can I get a C++ Compiler to instantiate objects at compile time
I am writing some code that has a very large number of reasonably simple objects and I would like them the be created at compile time. I would think that a compiler would be able to do this, but I ...
2
votes
4answers
372 views
Is using a bigger buffer useful?
I use buffer for quite a long time when I need to copy a stream or read a file.
And every time I set my buffer size to 2048 or 1024, but from my point of view a buffer is like a "bucket" which ...
1
vote
4answers
298 views
When should code favour optimization over readability and ease-of-use?
I am in the process of designing a small library, where one of my design goals is that the API should be as close to the domain language as possible. While working on the design, I've noticed that ...
1
vote
2answers
372 views
Registration: Email hash and verifying only one account per email
I'm using a registration function that hashes the email in PBKDF2 with a random and unique Salt each time. The hashes email and his salt are saved in the DB. No problem with that.
The problem is that ...
1
vote
3answers
152 views
Allocation problem identification
I have a matrix. I have a list of people who have to occupy n1,n2,n3 etc cells, different number of cells in different rows. I have to place the people in the cells. Occupying the same cell across ...
33
votes
13answers
9k views
How have languages influenced CPU design?
We are often told that the hardware doesn't care what language a program is written in as it only sees the compiled binary code, however this is not the whole truth. For example, consider the humble ...
2
votes
1answer
84 views
For Which Kind of Cache will this Program not run well? How can it be optimized?
Consider the following code fragment:
int a[8192], b[8192], c[8192];
int i;
for(i = 0; i < 8192; i++)
c[i] = a[i] + b[i];
For what kind of cache will this program not run well (set ...
2
votes
1answer
298 views
Is Google's Page Speed not working fine?
I've been making small improvements to a public ASP.NET site that I have and have ran it through Google's online Page Speed several times. I have a specific problem, but something that really threw me ...
2
votes
4answers
316 views
Does it still make sense to think about effective code on micro scale in C++?
Early in my programming career I was in love with pointer twiddling, lean code, doing everything with as little layers of abstraction as possible and so on. The code was very C like I would say, close ...
15
votes
4answers
706 views
Can applications affect power consumption in a substantial way?
Is there anything that can be done for a single general purpose application to affect the power consumption of the device it is running on?
I am not familiar with how optimizations to individual ...
2
votes
1answer
515 views
Rails application - how to optimize/reduce database calls when iterating over a collection
What's the best way to optimize a Rails app where you need to pull info from the database for a collection of items?
For example, if I am building an online forum system... I would have a number of ...
6
votes
1answer
256 views
Mobile cross-platform SDK for computationally intensive apps
I am aware of the PhoneGap toolkit for creating mobile applications for virtually all mobile platforms with a significant market share. However, the code in PhoneGap that is shared between the ...
2
votes
2answers
149 views
Better way to search for text in two columns
Here is the scenario. I am making a custom blogging software for my site. I am implementing a search feature. It's not very sophisticated - basically it just takes the search phrase entered and runs ...
4
votes
1answer
296 views
How to get experience in large scale databases?
I have written applications that are very small scale and the code I write works fine for them. But I have often wondered how the server side code I write would scale up from 100s of queries per day ...
4
votes
1answer
311 views
Research topics for starting and optimizing a high-traffic website
I bury a good deal of my ideas for fear that I don't know enough about scaling web applications and high-traffic websites. That said, I'd like to know of any general topics to research in order to ...
1
vote
1answer
365 views
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 ...
1
vote
3answers
1k views
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 ...
1
vote
1answer
303 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 ...
66
votes
19answers
4k views
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 ...
0
votes
1answer
147 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 ...
7
votes
1answer
260 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 ...
7
votes
6answers
962 views
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 ...
3
votes
6answers
482 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 ...
2
votes
1answer
86 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 ...
0
votes
4answers
997 views
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 ...
4
votes
4answers
3k views
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 ...
13
votes
6answers
1k views
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, ...
3
votes
1answer
223 views
Is there a module for writing low level code on Python?
Can you manipulate bits and memory directly using Python? If yes, wouldn't that be a best option to dealing with performance-critical spots than C bindings?
6
votes
4answers
415 views
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 ...
7
votes
7answers
952 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 ...
3
votes
4answers
343 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, ...
