Questions related to improving application performance, this can be range from selection software architecture to selection of algorithms.
0
votes
2answers
82 views
Haswell vs Ivy-Bridge E for best development performance? [on hold]
I'm looking to build a new development PC and am stuck between the newer Haswell CPUs and the older Ivy-Bridge E ones, I've looked up benchmarks online and it seems Ivy Bridge E is just a bit ahead of ...
5
votes
4answers
430 views
Why did the team at LMAX use Java and design the architecture to avoid GC at all cost?
Why did the team at LMAX design the LMAX Disruptor in Java but all their design points to minimizing GC use? If one does not want to have GC run then why use a garbage collected language?
Their ...
3
votes
3answers
325 views
Quickest way to split a delimited String in Java
I am building a Comparator that provides multi-column sort capability on a delimited String.
I am currently using the split method from String class as my preferred choice for splitting the raw String ...
-3
votes
2answers
241 views
Why is Javascript faster than Jquery? [closed]
I was reading a thread and saw this post, which says that Javascript is faster than Jquery because it uses native code. But why is the use of native code faster? Is this always the case? What ...
2
votes
1answer
84 views
How to know, with good performance, which areas a certain point is in? [duplicate]
I'm interested in build a prototype that needs this sort of thing:
Point A (xa, ya) with a radius of 500 meters.
Point B (xb, yb) with a radius of 700 meters.
Point C (xc, yc) with a radius of 1200 ...
3
votes
2answers
62 views
Build times for small incremental changes to C# Web Applications
I have recently been moving away from ASP.NET Websites in favor of Web Applications. More specifically I have recently been picking up MVC as an alternative to developing ASP.NET Forms websites.
...
0
votes
1answer
88 views
Search for object in loop or query? Who has better performance?
I have a DB that stores some complex objects of my app. When my app starts I load the objects into list and store them on the RAM.
But sometimes I would like to search for an objects that fulfills ...
1
vote
3answers
201 views
The clock problem - to if or not to if?
Let's say, we have a simple digital clock. To "power" it, we use a routine executed every second. We update seconds part in it. But, what about minutes and hours part?
What is better / more ...
3
votes
2answers
131 views
Improving the performance of a db import process
I have a program in Microsoft Access that processes text and also inserts data in MySQL database. This operation takes 30 mins or less to finished.
I translated it into VB.NET and it takes 2 hours ...
1
vote
2answers
76 views
How to overcome network latency when using data as a service like Cloudant?
I just can't understand, no matter how good and scalable of Cloudant (data as a service), how one can overcome network latency issue?
Even the data center is located within the same country, 100ms is ...
5
votes
2answers
275 views
Buzzword for “performance-aware” software development
There seems to be an overabundance of buzzwords for software development styles and methodologies: Agile development, extreme programming, test-driven development, etc... well, is there any sort of ...
1
vote
2answers
148 views
Setter Validation can affect performance?
In a scenario where you use an ORM to map your entities to the DB and you have setter validations (nullable, date lower than today validation, etc), every time the ORM gets a result, it will pass into ...
2
votes
2answers
200 views
Implementing set of processes in a stored procedure or through the code?
I want to know what's the suitable method to implement the following case (best practice).
If i make a set of processes like this:
select data from set of DB tables.
loop on the selected result.
...
1
vote
1answer
131 views
Will JVisualVM degrade application performance?
I have doubts in JVisual VM profiler tool related to performance. I have requirement to implement a JVM Monitoring tool for my enterpise java application. I have gone through some profiling tools in ...
-1
votes
2answers
82 views
Applications affected by memory performance [closed]
I'm writing a paper on the topic of applications affected more by memory performance than processor performance. I've got a lot written regarding the gap between the two, however I can't seem to find ...
0
votes
2answers
157 views
Perfomance of 8 bit operations on 64 bit architechture
I am usually a Python / Database programmer, and I am considering using C for a problem.
I have a set of sequences, 8 characters long with 4 possible characters. My problem involves combining sets of ...
1
vote
3answers
206 views
Storing a value vs calling reference for repeated use in Java
I have an old habit of avoiding calling references multiple times, both for easier to read/maintain code, and for possible efficiency. But I'm wondering which is more efficient (memory, performance, ...
2
votes
4answers
413 views
Database is performing slow, even all the tables are having normalization
One of the interviewers asked me this question:
Tables are created with appropriate normalization rules, However the database is performing slow. [Ie.: The select, insert statements are taking ...
4
votes
4answers
373 views
What are the reasons for great performance differences running the same program?
I'm no computer scientist so please bear with me.
Lately I wrote a python program that has to perform some expensive spatial searches while holding lot's of data in memory. I tried to improve the ...
3
votes
2answers
181 views
How relevant are “Requests per second” benchmarks?
Whenever a new framework is released it is a given that someone somewhere will benchmark it against other available solutions.
One interesting benchmark is the "Requests per second" benchmark. For ...
2
votes
2answers
124 views
Recommended guidelines for declaring bash/sh variables
I have been programming in BASH for a while now and the scripts that I write are starting to get more complicated.
I realized that I started to bring in some habits from C/C++ and wanted to get ...
7
votes
4answers
423 views
How to find bottlenecks in an application? [duplicate]
I'm building an application with lots of components, a lot of which are third-party so I only know what I can get from their documentation.
From time to time, by pure luck, I find out one of these ...
3
votes
4answers
296 views
Should We Code for Performance or Stability? [duplicate]
There is a point in time where you make design choices and debate them with management. In my case I have to debate my positions and design choices with senior management but it is frustrating that ...
3
votes
2answers
399 views
CA1819: Properties should not return arrays. Does this happen only with arrays? If yes, why?
I have a question about CA1819 msdn performance warning.
The rule is: Arrays returned by properties are not write-protected, even if the property is read-only. To keep the array tamper-proof, the ...
5
votes
4answers
399 views
Performance related doubt in Java with Hibernate
Suppose in some ORM based project (say Hibernate) I am trying to fetch only few columns rather then the whole Object with may be more than 20 attributes. I am writing HQL like "select attr1, attr2 ...
8
votes
4answers
1k views
Is try-finally expensive
In case of code where you have to do a resource cleanup before exiting a function, is there a major performance difference between these 2 ways of doing it.
Cleaning the resource before every return ...
0
votes
2answers
664 views
Is rewriting some java code to c++ using jni to improve performance, a good idea? [closed]
I've tried rewriting some java functions in c++ and called them using jni. I observed that it takes longer time to execute the native c++ functions as compared to java function, due to jni overhead.
...
0
votes
1answer
135 views
Will having ClassA extend ClassB slow down my runtime performance compared to having classC which contains all the members of ClassC?
I have a class with a lot of methods. I would like to group similar methods together in their own class, but all of the methods need to extend another class, ClassC. So I was thinking of having ...
2
votes
1answer
300 views
best way to store data from ajax call
I am writing a web-application in which I am retrieving data's from server through AJAX requests and the generate HTML content dynamically.
I have some data to load, generate HTML from it and append ...
37
votes
12answers
2k views
Documentation in OOP should avoid specifying whether or not a “getter” performs any computation?
My school's CS program avoids any mention of object oriented programming, so I've been doing some reading on my own to supplement it -- specifically, Object Oriented Software Construction by Bertrand ...
2
votes
1answer
112 views
Is doing some work for credit worthwhile?
Not sure how to title this as it's not just about that. But suppose that there is a software like .NET BCL, and you notice some places where you can make things much faster. It's not a great example ...
3
votes
2answers
244 views
Methods to identify and resolve memory leaks in the JVM
As the data is migrated via the object level, there has been a slow upwards trend in memory usage. I can see the periodic gc activity, but the memory trend is still going up slowly. I have currently ...
1
vote
2answers
161 views
How fast should a Python factoring script be?
Just how efficient is "good enough" for all intents and purposes? I wrote a script to simply list off all numbers that divide into an input, x, as pairs (i, n//i) and was just curious how efficient I ...
8
votes
3answers
1k views
Java Heap Allocation Faster than C++
I already posted this question on SO and it did ok. It was unfortunately closed though(only needs one vote to reopen) but someone suggested I post it on here as it is a better fit so the following is ...
0
votes
6answers
229 views
Benchmark of asynchronous code
Asynchronous programming seems to be getting quite popular these days. One of the most quoted advantages is performance gain from removing operations that block threads. But I also saw people saying ...
1
vote
3answers
256 views
Add javascript to all pages (for caching), or only to the pages that require the scripts (for a smaller page size)?
I'm using bits of javascript on my website for an image gallery, smooth scrolling, etc. These scripts are not used on every page (not every page has an image gallery for example). However, the scripts ...
0
votes
2answers
180 views
Is this a good measure of PHP script usage of the system?
I've been trying to see a way to get a measure of how much a PHP script costs of memory to the server. Well, I've found some solutions out there that requires some software to make tests and even ...
1
vote
1answer
153 views
Improving the efficiency of containers with dynamically allocated objects
This is not strictly related to C++ but its type system serves to illustrate the problem well.
Assume:
We have a generic template Container<T> (such as a std::vector<T>) which stores an ...
2
votes
2answers
127 views
Will object reuse optimize this often-called function?
Suppose I have a function that I need to call a lot, maybe a few thousand times on every mouse down or mouse move. It uses an instance of a function (class), called Transform:
function func1(a, b, c) ...
10
votes
6answers
291 views
When to start thinking about scalability?
I'm having a funny but also terrible problem. I'm about to launch a new (iPhone) app. It's a turn-based multiplayer game running on my own custom backend. But I'm afraid to launch.
For some reason, I ...
1
vote
2answers
172 views
When to really focus on performance?
We've just finishing up the first release of a database driven web application, which is now in regression testing. The application has an advanced search with many different filtering criteria. When ...
0
votes
1answer
195 views
Python — Time complexity of built-in functions versus manually-built functions in finite fields
Generally, I'm wondering about the advantages versus disadvantages of using the built-in arithmetic functions versus rolling your own in Python.
Specifically, I'm taking in GF(2) finite field ...
1
vote
2answers
401 views
Static vs. dynamic memory allocation - lots of constant objects, only small part of them used at runtime
Here are two options:
Option 1:
enum QuizCategory {
CATEGORY_1(new MyCollection<Question>()
.add(Question.QUESTION_A)
.add(Question.QUESTION_B)
...
5
votes
2answers
237 views
Structuring Access Control In Hierarchical Object Graph
I have a Folder entity that can be Moderated by users. Folders can contain other folders. So I may have a structure like this:
Folder 1
Folder 2
Folder 3
Folder 4
I have to ...
8
votes
3answers
437 views
When is it a good time to reason about performance in Haskell?
Simon Peyton Jones himself recognizes that reasoning about performance in Haskell is hard due to the non strict semantics.
I have yet to write a significant project in haskell so I wonder: can I ...
7
votes
2answers
269 views
Is there a comparative study of the memory consumption of programming languages runtimes, correlated with expressiveness and production bug ratios?
There are many comparative studies and available online when it comes to the runtime performance of applications built using one language or another. Some driven by corporations, some academic, some ...
4
votes
4answers
1k views
Server-side vs Client-side web application Performance [closed]
I am an entry level programmer with only a few months of experience.
Yesterday I was discussing with a colleague how we can improve the performance of a project we are working on together.
The ...
0
votes
0answers
68 views
Efficient Copy While Sorting
I have an algorithms library called NDex. I am in the process of upgrading it to a new version. Part of this upgrade involves providing two versions of many algorithms: an in-place version and a ...
6
votes
4answers
325 views
Is it a performance hit to create threads that loop a lot to check for things?
This is a generic question that I've always wondered.
In general, is it intensive for a CPU to create threads that perform "while not true ..." loops or similar?
For example, suppose I do:
// ...
1
vote
2answers
163 views
The best way of coding web system in term of performance [closed]
So far I've been using IPB and my custom scripts all coded in PHP but I am really disappointed of the long term performance of it.
I would like to move to native coding, the learning time to put into ...
