Questions related to improving application performance, this can be range from selection software architecture to selection of algorithms.

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1answer
54 views

How specific is too specific with css selectors?

The way that I like to write scss gives way to very specific selectors (code sample is under). Is this a bad thing? Are there any performance or reusability issues that I should consider? ...
1
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2answers
118 views

Is it better to perform a calculation in the field's setter or have a different method?

I'm implementing a simple Quota object which determines a usage percentage based on the maximum and the used. private int maximum; private int used; public Quota(int used, int maximum) { ...
-1
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1answer
48 views

Should I switch to a MVC framework? [closed]

I've created a real-time single-page game that uses Node.Js and sockets. Almost every second, I'm updating 20+ span with jQuery in user's browser. I already wrote a few thousand code in client side ...
1
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2answers
106 views

Is it a Good Practice to Catch All Exception? [duplicate]

The snippet below (in java) gives an example of my question. try { // code implementation here } } catch (Exception ex) { } ...
1
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2answers
51 views

Should benchmarks (to compare processors performance) be compiled with optimization CFLAGS?

I need to compare performance of 2 processors and I concluded I should benchmark then with several various tests. I'm currently using linpack (HPL) (because it's still well known and used for ...
5
votes
1answer
144 views

How to efficiently store big time series data?

I need to store and to be able to query some very large amounts time series data. Properties of the data are as follows: number of series : around 12.000 (twelve thousand) number of data points, ...
0
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1answer
32 views

Quickly write log entries from http requests in a MySQL database with high performance

When a dataset is saved in the software I use, a http request is triggered (fire-and-forget). Information like the timestamp, the user and the changes made are listed in the GET parameters. Now I ...
2
votes
3answers
84 views

Architecture for an event admission ticket scanner for events with multiple entries

I am working on a service that lets event organizers sell tickets to their events online (a lot like Eventbrite to be honest). The customers then print the tickets themselves (each ticket has a ...
2
votes
3answers
162 views

Effect of denormalizing

Here's a scenario where I'm wondering whether to denormalize a relational database (MS SQL). Text description of the requirement I have users (stored in a users table). Users belong to Accounts: ...
2
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1answer
38 views

Solutions To Partial ORM Retrieval

I have read the following question regarding whether it is best to use objects with fully or partially populated data members. The 3 suggestions were: that perhaps using a fully populated ORM model ...
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0answers
71 views

How do i compare PHP Efficiency between two algorithm? [migrated]

Here is two function that creates 1000 files inside 1000 folders in two different fashion: First Method function createEverything() { for($i = 1; $i == 1000; $i++) { mkdir('test/'.$i); ...
0
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1answer
151 views

What'd be better? To add one more local variable, or to call a method twice in general case?

I have the method which returns java.util.Date inside the hibernate-entity class: package ua.com.winforce.loto_partner.commons.db.entity; @Entity @Table(schema = "pr", name = "publice") public class ...
2
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0answers
123 views

Object caching in this code too expensive?

I'm having some trouble with a game developed in Java which is kinda slow. I benchmarked it a little bit and found the problem: most of the time, the JVM is in the Object.<init>() since there ...
0
votes
1answer
57 views

Reflection performance in this iteration of a (probably) large excel file

I'm wondering the performance of reflection in this situation. I'm iterating a (probably) large excel file (let's say 3000 max) which it's going to be done from time to time, and the implementation ...
1
vote
1answer
229 views

In C#, performance wise, an object's size does matter when you access one of its members through a reference?

It may be a stupid question but in C#, performance wise, an object's size or complexity does matter when you access one of its members through a reference? Or only that specific member is all that ...
5
votes
1answer
190 views

Log to file or to database table?

I'm developing a web application which uses MS SQL for various data: including users, user accounts, user licenses, license prices, invoices. I need to log users' real-time usage of the system, and ...
0
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2answers
99 views

Periodically polling an API, are there alternatives?

I'm currently working on a service that is supposed to aggregate data from a number of APIs, unify the data, and offer it through another API to the users. I had a couple of ideas for solving this, ...
1
vote
2answers
153 views

How does Yahoo's Smush.It work and why doesn't everyone use it?

I've recently come across an application by Yahoo called SmushIt. Apparently it does lossless compression on images. Sometimes the image size is reduced by as much as 90%. This of course has major ...
8
votes
4answers
289 views

Maintenance cost of SIMD programming code base

Question: The software industry's consensus is that clean and simple code is fundamental to the long-term viability of the code base and the organization that owns it. These properties lead to lower ...
1
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2answers
200 views

Most Efficient way to Compute the sum of divisors of N (1 ≤ N ≤ 1 000 000 000)

I want to write a code which computes the sum of divisors of a number N(1 ≤ N ≤ 1 000 000 000), excluding the number itself. However, I need an efficient way to do it. It suppose to print the answer ...
3
votes
1answer
103 views

Is console logging inappropriate for chatty applications?

12 Factor states that applications should log to the console, those console logs should should be unbuffered, and the logs should be redirected to someplace useful (file, database, whatever). But ...
3
votes
1answer
121 views

Designing a better performing total permissions setup for multiple permission levels

We've got a global system that we are attempting to solve a permissions issue around. Currently, our system serves a number of different applications out to our clients and each client has their own ...
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2answers
138 views

Does code format affect performance?

I think I have came across a few times when I reformat some segment of code, it performed the way I wanted it to other than the other poorly formatted segment of code? Does code format affect ...
0
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1answer
43 views

Balancing between performance, convenience & separation

Consider a web application that works with somewhat sensitive data on reliable, high performance clients. The data needs to be processed and manipulated. So far I have learned that when possible, ...
12
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8answers
380 views

500 databases or 1 database with 500 tables or just 1 table with all the records? [duplicate]

I currently have an application that is used by a single end customer. For ease of discussion assume the application only needs a single database table for all records. I now need to support ...
3
votes
1answer
67 views

Filesystem superblocks and their backup copies

I'd like to understand how (modern) filesystems are implemented and having trouble to fully understand superblocks and their backups. I reference ext4 and btrfs, but the questions may also apply to ...
4
votes
1answer
443 views

avoiding multiple calls to SQL while being modular

I have a BusinessLayer.dll which calls DataAccessLayer.dll which ultimately makes the tcp connection to the SQL server. Each business layer method has a corresponding method in the data access layer ...
2
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2answers
124 views

Combine union with distinct

Situation: I need distinct results from two tables, that both have duplicates. I would like to know if I should combine UNION and DISTINCT. Example 1 - Only use distinct SELECT DistinctValue FROM ...
1
vote
2answers
320 views

Infinite while loop CPU usage

I'm coding an script in C, which is going to check constantly an array of events, the idea is to check if the Date and time of certain event is equal to de current time and trigger something, i'm ...
0
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2answers
126 views

Should I worry about performance, even if there is no loss of convenience? [duplicate]

Assume an application that shows a data table. The data is loaded from a database when the program is initialized. Each value in the table is represented by an input field, where each keypress in one ...
0
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2answers
172 views

How does the Common Language Runtime improve performance? [duplicate]

I read on the wikipedia article for Common Language Runtime that one of the benefits that the runtime provides is "Performance improvements". Executing managed code (Or bytecode) must surely always ...
2
votes
3answers
278 views

Could the creation of many methods in Java affect performance? [closed]

I was told by a colleague that in Java, the performance may be worse if we create more methods, stacking many methods calling over them in JVM, specially in a Java EE environment. This seems to ...
4
votes
2answers
105 views

To find the oldest/newest element in a heap

I want to find the oldest/newest element added into a heap of size k. At any given point of time if I have to find say the oldest element in the heap is there any approach with O(1) space and O(1) ...
4
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7answers
323 views

Are mutliple database calls really significant with a network call for a web API?

At one of my employers, we worked on a REST (but it also applies to SOAP) API. The client, which is the application UI, would make calls over the web (LAN in typical production deployments) to the ...
2
votes
4answers
522 views

Why aren't we building and using parallel processors *meant* for general computation?

We all know GPUs are much faster than CPUs for a wide range of applications. When someone asks why we are not just programming for GPUs at all, one of the most common answers is that GPUs are not good ...
0
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2answers
347 views

Mobile App Development-Architecture/Platform: Main performance concern: device/UI responsiveness [closed]

I am currently investigating different alternatives for building a mobile instant messaging application for iOS and Android, using an XMPP server (probably ejabberd) as the back-end. Main requirements ...
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votes
1answer
67 views

How create unit test the performance of an application? [closed]

What I want is to run automatically methods to tests the performance of an application. Just like the unit tests, but with the purpose of evaluate the performance and create reports if is it possible. ...
3
votes
1answer
254 views

How do I add link-time optimization capabilities to my LLVM-based compiler?

I am designing and implementing a programming language, and I am using LLVM for native code generation. Among others, performance is a key feature of the language, and as such, I am looking to ...
1
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2answers
170 views

How to measure algorithm accuracy?

I have a few optimization algorithms (for finding function minimum) and I'd like to check how good they are. Suppose I build test cases and compare the actual results to theoretical ones. What ...
27
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15answers
2k views

In the days of modern computing, in 'typical business apps' - why does performance matter? [closed]

This may seem like an odd question to some of you. I'm a hobbyist Java programmer. I have developed several games, an AI program that creates music, another program for painting, and similar stuff. ...
1
vote
2answers
322 views

How to approach program design with respect to data strucutres and algorimths - is there an equivelant of the OO design process for d.s.'s + algs? [closed]

My applogies for probably the worst written body of text I have produced in my life and many thanks to those willing to plough through it all. I was (and still am) not able to clearly express what I ...
1
vote
1answer
130 views

Entity-Attribute-Value table vs single table for storage of posts, events and pages

I am trying to decide whether to just use individual tables with more fields for storing posts, pages and events or using tables with basic fields plus having EAV tables as well for fields that are ...
9
votes
5answers
977 views

Are there technical limitations or language features that prevent my Python script from being as fast as an equivalent C++ program?

I'm a long-time Python user. A few years ago, I started learning C++ to see what it could offer in terms of speed. During this time, I would continue to use Python as a tool for prototyping. This, it ...
0
votes
2answers
81 views

Static and dynamic data : should I use different databases?

Say I am building a website that uses two different types of data : Static : information that will hardly change, like movie awards or world countries names (I want fast access so no external API) ...
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votes
1answer
68 views

Huge long addition overhead compared to Native call?

A run a simple test JDK 1.7.0_45 (Windows 7, 64bit): Test 1: long start = System.nanoTime(); for (int i=0; i < 1000000; i++) { System.currentTimeMillis(); } elapsed = ...
5
votes
2answers
446 views

Should I group all of my .js files into one large bundle?

One of the difficulties I'm running into with my current project is that the previous developer spaghetti'd the javascript code in lots of different files. We have modal dialogs that are reused in ...
0
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4answers
284 views

What is the “1620's multiplication operation”?

I was stumbling through Wikipedia when I came across the entry for FLOPS, specifically the table in this section. The first entry is for a computer from 1961, the comment on the right reads The ...
0
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0answers
32 views

Defining property and find substitution for copy function of python in cython

I want to cythonize a code in python to speed up the code. In the following you can see my attempt to make my python class understandable for cython: import numpy as np cimport numpy as np ctypedef ...
3
votes
2answers
292 views

What's a good simple way to combat the n+1 problem?

I'm trying to better understand performance in PHP. One issue I'm thinking about is the n+1 problem. By n+1 I mean something like this: $posts = Posts::getPosts(); foreach($posts as $post) { ...
4
votes
1answer
227 views

Why does Haskell's built in max function run faster than mine?

I noticed that for some reason, Haskell's built in max function (which returns the greatest of two numbers) runs much faster than the one I wrote, even though they are essentially identical. From ...