Questions tagged [performance]

Performance is a subset of Optimization: performance is the goal when you want the execution time of your program or routine to be optimal.

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Definitional Returns. Solved. Mostly

I have made the bold claim that a longstanding problem in Rebol is "now solved"...that of "definitional returns". But of course, such claims need some peer review, and there's always some new trick ...
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Multiplying big numbers using Karatsuba's method

The Karatsuba algorithm, first published in 1962, aims to speed up the multiplication of big numbers by reducing the number of 'single-digit-multiplications' involved. Because of its complexity (...
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Delete engine for deeply nested linked structure

The background is the question at https://stackoverflow.com/questions/36634394/nested-shared-ptr-destruction-causes-stack-overflow. To summarize, for a data structure that looks like: ...
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Generate a video of typing the contents of a file

I wrote a Python script to generate a video file of typing the contents of any program file. It works, but I'm really not very happy with how it works. I have several issues with it. In order to ...
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Neural Network with Template Metaprogramming

I was implementing a simple neural network, and I noticed that, if I ever wanted to change the layers' activation functions, i would have had to completely rewrite some parts of the code, so I tried ...
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Red-black tree appears to be slower than std::multimap

I've written a red-black tree in C as an exercise. The tree works and it is not bad, but it is about 10% slower than std::multimap from libstdc++ which I'm ...
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1answer
668 views

Function that recursively downloads entire directory is slow

I created this function to recursively copy an entire directory from an FTP server. It works just fine except that it is about 4 times slower than using FileZilla to do the same operation. It takes ...
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Frequency analysis for simultaneous dice rolls

My professor told me to optimize my perl code, but he wouldn't tell me what exactly - just make it simpler. I changed some little things but nothing major. Am I missing something? The task was: ...
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Unity3D shader for rendering 2D sprites with a pseudo-glitch effect

I'm making a puzzle game in Unity with sprite-based graphics. When the game is paused, I want to hide most game elements, because I don't want the player to be able to pause and leisurely think about ...
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Modeling tabular structure in MSSQL to store data like Excel sheet applying Column inheritance

I've created this database structure to store tabular information (it's a simplification of my real structure but enough to show the point). In it I have Sheets and ...
7
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803 views

Read quantization tables from JPEG files

I'm developing an application that will hide information inside the quantization tables of JPEG files. It's called DQTsteg, if you want to know more about what I'm attempting to do. Right now I'm ...
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Stable variation of built-in sort

Ruby's built-in sorts are unstable. The stable_sort gem monkey-patches Ruby's built-in library to have stable sorts which include nearly all the functionality of the built-in sorts, but with the ...
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How to make my groupby and transpose operations efficient?

I have a DataFrame of size 3,745,802 rows and 30 columns. I would like to perform certain groupby and ...
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89 views

Julia set in Julia (and other fractals)

I've made the following to draw a series of zooming in images of a fractal. ...
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How to speed up simple linear algebra optimization probelm in Julia?

I implemented the LSDD changepoint detection method decribed in [1] in Julia, to see if I could make it faster than the existing python implementation [2], which is based on a grid search that looks ...
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89 views

Generating integer partitions

I've tried to implement integer partition algorithm as described in blogpost below (author implemented it in Python): Generating integer partitions I'm still trying to learn best practices in ...
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85 views

Reading sparse matrix from binary file

I have binary files containing sparse matrices. Their format is: number of rows int length of a row int column index int value float Reading ...
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75 views

Perl gradient noise generator

I'm working on 2-D top-down graphics engine, and need a way to simulate clouds. My idea was that I could create a layer comprised of a matrix of rectangles whose alpha value would be picked from a ...
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97 views

Android component animatable on its height

I'd like to have a code review for a component which is supposed to be animatable on its height. It's supposed to be a transitioning element. I find it quite laggy on my phone. ...
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2k views

Calculating T-Test within Large Pandas Dataframes

The below code runs a t-statistic within a large dataframe (rnadf) based on masked values from another dataframe (cnvdf_maked). ...
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595 views

Pseudo-parallel depth-first search

I'm writing a small program that generates a file containing an adjancency matrix, it then reads from that file, constructs a graph and does something like a parallel depth-first search (dfs) on it. ...
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504 views

Gauss-Seidel+SOR

I am learning OpenMP+MPI hybrid programming. As an example I have chosen Gauss-Seidel+SOR. My implementation uses MPI_THREAD_FUNNELED style hybrid programming, ...
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727 views

Parsing Lua 5.2 strings with patterns

I wrote some code to parse Lua 5.2 strings in Lua 5.1, using patterns. It works perfectly as far as I tested. ...
6
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0answers
364 views

Fowler–Noll–Vo hash function in Lua

I recently coded this FNV-1a hash function in Lua. Are there any apparent performance improvements that could be implemented? ...
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392 views

Translating CFRM algorithm from Java to Clojure and improving performance

Counterfactual Regret Minimization is an algorithm that can be used to find the Nash Equilibrium for games of incomplete information. I have tried to adapt the exercise from here to Clojure. You can ...
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Implementing recursive filters with Haskell/Repa

I recently learned Haskell, and I am trying to apply it to the code I use in order to get a feeling for the language. I really like the Repa library since I manipulate a lot of multi-dimensional data....
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Chart Based Animations In Excel VBA

I've been working on re-writing comfortablydrei's answer to this PPCG Question regarding creating a illusion animation in pure Excel VBA. So far, I've been able to rewrite the code to function in VBA, ...
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Tensorflow loop to analyze gradients derived from MRI and PET images

The code shown below takes the partial derivative of each pixel of the output fused image of a neural network with respect to input image of the neural network using tensorflow's ...
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1answer
172 views

Search and Replace (FreeCodeCamp intermediate algorithm scripting)

I completed the challenge and passed the tests: Perform a search and replace on the sentence using the arguments provided and return the new sentence. First argument is the sentence to perform ...
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529 views

Asyncio HTTP Request Queue

I wrote a simple sitemap.xml checker using asyncio and aiohttp. I followed the documentation demonstrating the producer/consumer pattern. However, I noticed that as the URLs scale larger, it seems to ...
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620 views

Codewars: N-dimensional Von Neumann Neighborhood in a matrix

Task: For creating this challenge on Codewars I need a very performant function that calculates Von Neumann Neighborhood in a N-dimensional array. This function will be called about 2000 times The ...
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176 views

A* algorithm optimization and implementation

I am implementing the A* algorithm in Python and have successfully completed the task. It works and even spits out the coordinates from the start to the end. However, I am programming a bot for a ...
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182 views

WebPage LogReader class - Parallel DNS w/timeout for computer IP's and domains from log scrape

This is a namespace to read a bunch of events from a log file and display them in a table on a webpage, some additional data (computer domain and IP address) is also pulled in from DNS. I am mostly ...
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Building a form for rebooting many network devices

I have several IP based devices that, due to building maintenance, occasionally lose their communication with the other devices. Normally you'd have to find the device IP, go to its control page and ...
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65 views

Simulation of a mechanical arm

The code that I am doing is to simulate a scenario where a mechanical arm search pieces closer and these pieces selected the mechanical arm leaves in a position defined closer. ...
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371 views

Object-oriented fractal tree

I made an object oriented fractal tree in javascript using the p5 library, it consists of three files: Fraternal Tree.js branch.js flower.js Here is the github repo with the source code. All the ...
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695 views

Implementation of DBSCAN in C++

I've recently just finished my implementation of a DBSCAN in C++ for a machine learning framework. I've tried to follow the pseudocode implementation on Wikipedia as best I could. I also found some ...
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155 views

Assembling and traversing a graph, given a list of items and parent pointers

I've written a function which takes input such as this: ...
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216 views

Median filter for large mask

I'm trying to implement the fast median filter developed by T.S.Huang (HUANG, T.S. 1981. Two-Dimensional Signal Processing II: Transforms and Median Filters. Berlin: Springer-Verlag, pp. 209-211.). ...
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661 views

Multiple 0-1 knapsack

I have a problem were the time in minutes of N songs are given and I have to write the maximum number of time in K CDs. Input description The first input line consists of two positive integers N e ...
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430 views

Specialty tree structure - BK Tree

I've been working on a implementation of specialty tree structure called a BK-Tree (more here and here). Basically, it's a tree that allows relatively efficient querying for items within a specific ...
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133 views

Kernel density regression in Julia

Here is a naive implementation of a kernel density regression algorithm in Julia. The code works, but there is quite a bit of room for improvement though. First, there is not an optimal bandwidth ...
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412 views

Persistent segment tree

I'm trying to solve this problem. Given a sequence \$B=B_0,B_1,\ldots,B_{N−1}\$ for each query \$(P,K)\$, find the minimum \$S\$ s.t. there are at least \$K\$ entries in \$B\$ that satisfies ...
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Extract data from API using VBA & XML (Performance)

EDIT: Added a block with the raw code at the bottom (suggested by a friendly user) First post here. I sincerely hope that I am doing everything by the book. Also, I want to thank you in advance for ...
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Speeding up code to check whether a permutation with one fixed point can be rotated into one with two fixed points

A friend gave me the following riddle: Given n people with n distinct names, you place n names tags on a round table with n seats. If the n people now sit at those seats randomly such that exactly ...
4
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1answer
43 views

Windows autoclicker with a console interface

I have recently started coding in c++ and have made a simple console application. When executed the program asks the user to position their cursor wherever they want continuous repeating clicks, after ...
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62 views

Interacting with PostgreSQL attachment and the file system

I have just migrated from Python 2 to Python 3. I have written the following script to fetch all records of a table, ir_attachment, from PostgreSQL. After fetching all the records I check following ...
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68 views

Extracting cycles from directed graph with max degree 1 and then performing set cover on cycles

I'm trying to solve P1243E in an efficient manner. The problem in simple words is: Given \$k\$ boxes, \$i\$-th box with \$n_i\$ numbers. All numbers are distinct. We need to select one number from ...
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Evaluating a previously calculated gradient function

I am trying to perform optimization using a surrogate model instead of the real function and for that, I need the gradient of my LSTM model with respect to the input. In this case, I have 3 features ...

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