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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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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
  • 149
2 votes
1 answer
453 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 ...
user16217248's user avatar
0 votes
1 answer
102 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
  • 225
-1 votes
1 answer
88 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
147 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
  • 391
2 votes
0 answers
142 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
206 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
0 votes
0 answers
41 views

Is CQRS applicable with total ordered views and sharding?

Merry Christmas everybody. I am trying to solve a theoretical sharding problem out of my own curiosity and I think CQRS can help me achieve properties that I want of my data. I have too much data for ...
Samuel Squire'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
128 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
6k 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
102 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
556 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
9k 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
232 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
169 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
84 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
  • 693
-1 votes
2 answers
236 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
165 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
9k 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
106 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
881 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
380 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
990 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
449 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
807 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
50 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
60 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
218 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 ...
ndsvw's user avatar
  • 101
9 votes
4 answers
557 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
4k 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,...
Hazel へいぜる's user avatar
0 votes
1 answer
89 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
1k 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
69 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
  • 236
1 vote
1 answer
276 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
847 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
  • 21
-1 votes
2 answers
210 views

Using OOP objects mapping to DOM elements vs. querying the DOM repeatedly?

I'm trying to make better use of OOP, but I don't have good instincts for this yet and I sometimes worry I'm making things more complicated and/or less efficient. I'm wondering what is the best way to ...
jamescodes's user avatar
-3 votes
1 answer
83 views

Choosing between network optimisation and CPU usage in clientside web development [closed]

I'm working on a CSS library that includes hundreds of selectors and rules for quick templating instead of writing regular CSS. This is used as a replacement of attr() CSS function until it works for ...
Tot's user avatar
  • 147
1 vote
1 answer
132 views

Feature Store Design for input data like JSON, CSV and Excel

I need a design approach for a feature store which accepts input data in the forms of CSV, EXCEL, JSON etc. The backend stack we support is Java, Spring boot and oracle DB. Note : Each file ...
crazy_code's user avatar
2 votes
2 answers
128 views

Design a function that indicates significant deviations in response times

I'd need some feedback on how to approach the design of a function that highlights parts of a time series chart. The chart shows the response time of an application, in particular the 90th percentile, ...
Max's user avatar
  • 337
1 vote
2 answers
176 views

Automating performance tests for python code in a CI

My apologies in advance for a question that might seem trivial - I am a mostly solo dev in academic environment and a lot of industry best practices don't necessarily make it here. Several of my ...
Andrei Kucharavy's user avatar
0 votes
1 answer
162 views

What approaches are there for handling elements in contiguous memory while being dependent on other user input

I am creating a vectorized reinforcement learning environment. It handles multiple instances of a board game in synchron. Up until now, the state of the environment was a specific representation of ...
Dudly01's user avatar
  • 137
2 votes
2 answers
1k views

JS - two array filters vs. one forEach?

I've had a question for a while. I know that the Array prototype method filter is generally preferred over forEach, and I believe it is typically faster at the job as well. But what about if I have ...
Michael Jay's user avatar
1 vote
1 answer
517 views

C++: Broadcast/observer pattern with polymorphic events

I'm currently trying to implement an event-system following a broadcast/observer scheme. I have events/notifications that contain information about what is happening: class Event { public: Event(...
TheBeautifulOrc's user avatar
-1 votes
1 answer
175 views

How to objectively monitor REST APIs performance based on the request/response size

We recently integrated a monitoring solution (Data Dog) for our REST-APIs based microservices. The monitoring solution gives us many useful metrics. For example, we can see the average response time ...
Hawk's user avatar
  • 467
4 votes
1 answer
2k views

In C++, If a member function can be made static with no change to functionality, are there any performance or memory benefits from doing so?

A very straightforward question. When I think about many of the member functions I create for my classes, many of them can be made static without affecting any functionality whatsoever. If I do so; ...
Anon's user avatar
  • 3,545
0 votes
0 answers
33 views

A large number unused wakelocks and performance

There is an application that every day creates about 100-200 new wakelocks for android. each wakelock is used once and after using it is no longer needed, but remains in the system. Thus there are a ...
Filin's user avatar
  • 9
1 vote
2 answers
665 views

Performance strategies for repeatedly iterating through large JSON files

I'm designing a project which will require iterating through a foreign language dictionary in JSON format. The idea is clicking on a word in a text will trigger a search on the JSON file for a match. ...
souser's user avatar
  • 121
0 votes
1 answer
300 views

How to add APM/observability/tracing in a monolithic architecture?

I keep reading articles analyzing Monitoring and Observability, or having lots and lots of text regarding how the latter is the extension of the first, or how they are complementary, or how tracing is ...
Astyanax's user avatar
  • 324
1 vote
1 answer
108 views

How to segregate blog posts into seen and unseen?

Imagine an app like Instagram/Reddit with a feed of posts. Problem: We want to show users posts they have not seen before. When the user first opens the app, we retrieve 30 latest posts from the ...
code's user avatar
  • 121

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