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Questions tagged [performance]

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

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2 answers
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Text files vs. MySQL Performance for Large Dataset

I am currently making a system for users to generate flashcards for Languages. This involves adding information such as the definition, pronunciation, and example sentences for a word. So far, I have ...
Jarvis Coghlin's user avatar
1 vote
1 answer
89 views

Does it make sense to use a graph database (Neo4j) for a diagramming app?

I am developing a diagramming application and want to optimize operations with the Nodes and Relations of the diagram. Currently, I am using a relational database with tables for diagrams and nodes. ...
Maksim Murza's user avatar
-1 votes
2 answers
117 views

How to handle complex logic, avoiding recalculation for performance reasons?

let's say we're building an Ecommerce Marketplace. We have Sellers and each Seller has Products. We want to display a list of available Products across all Sellers to Buyers. But, we only need to ...
Staskij's user avatar
  • 21
2 votes
2 answers
347 views

Game Systems Interaction Design

Intro I'm writing an FPS game in c++. There is a timed game mode, players run around a map shoot from a variety of weapons which are either hitscan or projectile based, when a shot connects, based on ...
cuppajoeman's user avatar
0 votes
5 answers
219 views

Load and process (compressed) data from filesystem in the blink of an eye

We have a huge amount of queries hitting our API that request a minor or major extract of some huge files lying around on our mounted hard drives. The data needs to be extracted from the files and ...
glades's user avatar
  • 419
0 votes
2 answers
396 views

Explain 90th-percentile response time of 2 seconds when handling 200 concurrent connections per second

From Ch 12 (Resiliency) of the book "Building Microservices" In the context of how much resiliency is too much resiliency How long should various operations take? It can be useful to ...
wenn32's user avatar
  • 129
6 votes
2 answers
910 views

How to get out of a memory usage problem of a .NET application?

As mentioned in some StackOverflow posts (like this one), I'm dealing with a difficult situation: My company is developing some C# applications (being a client-server application). We have migrated ...
Dominique's user avatar
  • 1,788
0 votes
0 answers
32 views

Balancing logic placement in the domain and general perfomance of the system

I am writing my first application using DDD (in Node with TS) and I started writing all the domain first -- before starting the repositories/DB and then the application, while writing unit tests for ...
Bernardo Benini Fantin's user avatar
3 votes
2 answers
600 views

Maintaining global states in a recursive function

I am writing a recursive function. Some of the parameter data is different for each recursive call but some of the data only need to have one copy existing at any one time during the recursive call. ...
CPlus's user avatar
  • 1,189
15 votes
4 answers
5k views

Better solutions than joining table for Many to Many?

Lets say I have students and classes which are 2 entities. A student can take many classes and a class can have many students. This would be a many to many relationship. To solve this with an RDBMS my ...
Jeremy Fisher's user avatar
15 votes
6 answers
6k views

Why is it necessary to mark classes as not inherited from? Can't an optimizer automatically detect that virtual calls are unnecessary?

In C# and C++, an apparent trend is in place to reduce / avoid inheritance: C#: "Sealing types can improve performance." https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/...
user avatar
0 votes
1 answer
270 views

How do function inlining and Tail Call Optimization affect call stack?

I've just accidentally came across this answer about inlined functions and I'd like to know how this affects call stack. But I can't add comments because I don't have enough rep so I decided to ask ...
b3rry's user avatar
  • 3
0 votes
2 answers
242 views

Build an API for a graph app with + 30 millions data points

I am quite new to design software and especially graphs. So I am working on a full-stack app with a back-end built on FastAPI (python) et front-end on React. I need to create 4 graphs on a single page ...
intern_2004_uk's user avatar
7 votes
2 answers
2k views

How can I make code that is both DRY and fast where intermediate values in a calculation may or may not be needed?

How can I make DRY (lacks repetitive patterns) code that also avoids inefficiencies from using intermediate values in a calculation that might not need to be used? Here is an example: In this code, I ...
CPlus's user avatar
  • 1,189
0 votes
3 answers
145 views

Should web applications have predictable worst-case resource usage?

Consider Mastodon as an example - basically open source Twitter. Tweets can be up to 500 characters long. Of course, since it's open source, you can modify it to allow longer tweets. Unmodified ...
Stack Exchange Supports Israel's user avatar
3 votes
1 answer
409 views

Is C usually a last resort?

I've been learning C recently. I've completed a number of coding challenges on websites like codewars in C, and I always find myself wishing I had something like Python's flexible data structures. In ...
Connor's user avatar
  • 159
2 votes
1 answer
1k views

Saving and reading files in user specific application data in C or C++

Most useful or reasonably complex applications need to save data such as user settings or saved games or browser history. I have been working on applications and games in C or C++ but I am not sure ...
CPlus's user avatar
  • 1,189
0 votes
1 answer
707 views

I want my Docker container to use more of the host's CPU resources

I have a DigitalOcean droplet on which I have deployed a Docker container (Docker version: 20.10.14), but my app is sometimes slow, therefore I would like to allocate more resources to it. The droplet ...
samdouble's user avatar
  • 243
-1 votes
1 answer
152 views

Fast methods to consolidate 20 csv files into one xml file [closed]

We have 2 systems Legacy & New and I have to migrate the data from the legacy system to the new system. The legacy system exports the data in .csv format while the new system accepts the data in ...
Maher Nabil's user avatar
1 vote
1 answer
172 views

How do I narrow down a search space if symmetries are equivalent?

I have an algorithm that runs a search through every combination of a 5x5 grid where each cell can have 3 values, looking to see which combinations meet certain conditions. This gives 3^25 naive ...
Jason C's user avatar
  • 465
2 votes
0 answers
188 views

Speed up implementation of "log transform" on 2D image

I'm working on an implementation of the "log transform" operator on an image for C++, and we currently have it formulated as follows (python code). Note we use log10 instead of the natural ...
kwsp's user avatar
  • 129
8 votes
3 answers
229 views

Choosing one of two memory blocks to deallocate: Does age affect fragmentation?

First question here, so preemptive apologies if I've committed some faux-pas. Additionally, I am aware that this question is about possibly the micro-est of micro-optimizations ever, and "micro-...
Da Spud Lord's user avatar
15 votes
6 answers
6k views

Accessing enemies' locations quickly in a 2D game

I have a simple 2D game which has squares, player (teal) and enemies (red). class Game { List<List<Square>> map; Player player; List<Enemy> enemies; ... My problem is that I ...
MaLa's user avatar
  • 310
0 votes
1 answer
141 views

Best software architecture approach for a single core system

Objective: Designing a data intensive application(myApp) C++ on Linux/RTOS which runs on a single core cpu, there are also 150 other applications share the same core with high priority than myApp. How ...
uss's user avatar
  • 141
8 votes
5 answers
9k views

Is code written inline faster than using function calls?

I wrote some script in Python that creates a giant 2D matrix (1000x1000 or bigger) and fills it with random numbers. And after that, it goes through every element of the matrix and changes the number ...
devdevdove's user avatar
0 votes
0 answers
193 views

Avoiding reloading entities many times with EF Core and Mediatr

We have a largeish .NET Core project which uses Mediatr and EF Core. Many of the queries look something like: public class GetSomeInformation : IRequest<string> { public int DocumentId { get;...
Lou's user avatar
  • 265
0 votes
3 answers
716 views

Why isn't a counter used to avoid nested for loops for index based operations?

Let's assume we have a method that we want to run as fast as possible and it needs to loop on a 2D array, naturally we would do a nested for loop as such: int[][] arr = new int[3][3]; for(int ...
Yoh's user avatar
  • 51
34 votes
7 answers
10k views

Does Garbage Collection Scan The Entire Memory?

I was reading a bit about garbage collectors and I am wondering if the garbage collector of a program scans the entire heap memory or what is allocated to it? If it reads the entire system memory, ...
PoJam's user avatar
  • 475
1 vote
3 answers
234 views

Does it always take the same amount of time to retrieve the same thing from collection?

for example: const arr = [1,2,3,4]; const coordinate = [arr[0] + 2, arr[0] + 1]; here arr[0] is written out twice, when the code is executed would it literally go and find same value twice or would ...
link2name's user avatar
1 vote
1 answer
1k views

Can I assume "Perf" is a commonly understood abbreviation for "Performance" in the context of Software Engineering? [closed]

I have been using "Perf" when writing about performance of some pieces of software (in tools, pull requests, etc.) but was wondering recently if this was an appropriate practice. Can I ...
wip's user avatar
  • 318
1 vote
1 answer
96 views

Can we reliably use unaligned scalars on contemporary hardware?

Processors have come a long way in their handling of unaligned data - from crashing at the very notion of it, through suffering severe penalties, all the way to having almost no impact. I suppose it ...
dtech's user avatar
  • 723
-1 votes
2 answers
482 views

Should I store non-editable items lists in a database?

Relational database is mostly used for storing editable user data. But how about storing non-editable lists of information? Possible examples are: GUI-related: main menu items, selectbox options, ...
user14967413's user avatar
-1 votes
2 answers
226 views

Performance hit after non-functional refactoring

I was asked to refactor some C++ code recently for the purposes of increasing unit testing coverage. The problem was that the code was tightly coupled on one compilation unit, so we had the equivalent ...
Component 10's user avatar
35 votes
10 answers
10k views

Am I right that switching programming languages will have little impact on the scalability of a CRUD API?

An external consultant to our team advised us to rewrite our SaaS offering (essentially a CRUD API) in .NET because this is more "scalable" than using Node.js (or Ruby on Rails, Flask, etc.)....
Vincent's user avatar
  • 544
-1 votes
2 answers
196 views

Difficulty understanding how denormalization results in more storage necessary

I am having difficulty understanding how denormalization results in more storage necessary. For example, let's say that in a normalized relation, there's Table 1 and Table 2. In order to join Table 1 ...
Henry Zhu's user avatar
  • 153
0 votes
1 answer
2k views

Java: Is there a performance difference between variable assignment vs. inline usage?

Is there any performance detriment to assigning variables vs using them inline. I'm guessing this WOULD be worse if a method was returning primitive and I was 'boxing' it (e.g. method returning int, ...
nanotek's user avatar
  • 301
2 votes
1 answer
402 views

Difference between `Class.X` and `Class.getX()`?

Might be a silly question or something I might have just messed up in my head but here we go... I saw a code example of someone using getPos() in their own class to retrieve the current position of an ...
darclander's user avatar
9 votes
5 answers
1k views

Today I wrote "tests" for the testing code. Was it the right thing? Is it a smell?

My application has big integration with the database. Classes that use the database are very crucial for the system, so I write small unit tests for classes that I call Repository. The reason behind ...
George Z.'s user avatar
  • 705
3 votes
1 answer
805 views

How to store a huge volume of time-series datapoints in an efficient way?

We have an application producing 5k-10k datapoints per second. Each datapoint has more than one metric, alongside its time of creation. We are looking for an efficient, scalable way to store this huge ...
Paul Benn's user avatar
  • 147
1 vote
2 answers
2k views

Preventing parent component re-rendering of a big React component when you "Lift State Up"

I have a very big form - let's call it <MyForm> - consisting of the following: text fields and dropdowns custom selector made of selectable cards table input (for this example 50 rows with each ...
Hans's user avatar
  • 121
-3 votes
1 answer
65 views

Server performance and CMS scalability [closed]

I have been given the job of a colleague who has resigned and I don't know where to start. I hope you can give me some hints: It is about a CMS made from scratch (Javascript/jQuery/PHP/MySQL) which ...
ADM's user avatar
  • 97
0 votes
0 answers
61 views

Do datacenters have conditions that might throttle component clock speed (either intentionally or automatically)?

Here is the question. On a 2.2 GHz processor with 6 physical threads and 6 hyperthreads, I see performance on the order of 3-10s for a particular job involving OpenCV. I do not specify that the ...
Chris's user avatar
  • 109
0 votes
0 answers
295 views

Improving performance of 'Weighted/prioritized left shuffle algorithm'

I wrote a prioritized/weighted left shuffle algorithm (the code is copied from my open source C# project Fluent Random Picker). What does that mean? You've got some values and each of them has a ...
hardfork's user avatar
  • 101
9 votes
4 answers
599 views

How to document alternative code I considered but didn't go with due to performance?

I write code in R, and often find myself attempting to optimize the code for better performance. In a given script that tackles a specific problem, I test different code alternatives and compare them ...
Emman's user avatar
  • 209
14 votes
3 answers
5k views

What are the complexities of a binary search?

I recently asked a question on CodeReview SE where using a binary search was recommended, and the author of the answer proved that it was faster than my implementation. During my research on the topic,...
Taco's user avatar
  • 1,165
0 votes
1 answer
135 views

Right way to combine data between Mongo and DynamoDB

I am looking for a way of dealing with the following situation: 1- Have an items collection in MongoDB 2- Have a users collection in DynamoDB 3- Each document in the items collection has a "...
alvm's user avatar
  • 3
2 votes
1 answer
2k views

Multiple if condition optimization

Often I find conditional statements such as: if (life_max < max): if (expand): do life_max = max else: if (life_max > max) and not (expand): do life_max = max; Although readable, ...
Chibueze Opata's user avatar
0 votes
1 answer
81 views

How should I model/design these aggregates?

I am new to DDD and I am trying model/design the aggregates of the following domain. The domain consists of several concepts: Assessment Models (AM) which contain Enabling Elements (EEs) and Focus ...
geeko's user avatar
  • 246
1 vote
1 answer
310 views

Advantages and disadvantages of including JS/CSS inside the HTML?

What are the advantages and disadvantages of including JS/CSS inside the HTML instead of separated files? Specifically concerned about performance issues, for example, if the CSS and JS are small and ...
MauricioRobayo's user avatar
1 vote
2 answers
2k views

How to effectively handle a large API call

I have an API call that returns products to be displayed on a Point-of-Sale system. the current account I have has about 7000 products. Initially I made the API return all products at once, this works ...
Derek's user avatar
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