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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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
835 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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526 views

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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1k 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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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 ...
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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 ...
7
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107 views

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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171 views

Optimizing bit-matching performance using AVX compiler intrinsic

We are working on a complicated math problem, very detailed question with description of the problem is here: C++ multi-threaded determination of curling numbers in vectors. That code is now converted ...
6
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159 views

C# Generic high performance vectorized math operations

I'm writing a library which simplifies the usage of intrinsics in C#. It's a generic library which supports all numeric types. The goal of this library is to perform these operations at the highest ...
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83 views

Code optimisation: Converting dataframe to numpy's ndarray

I am working with a dataframe of over 21M rows. ...
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187 views

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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237 views

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 ...
6
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0answers
128 views

Julia set in Julia (and other fractals)

I've made the following to draw a series of zooming in images of a fractal. ...
6
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0answers
119 views

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 ...
6
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168 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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190 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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722 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 ...
6
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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 ...
6
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107 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. ...
6
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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). ...
6
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723 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. ...
6
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526 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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782 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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473 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? ...
6
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0answers
408 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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422 views

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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177 views

Multithreaded pathfinding in Unity C#

I've tried to implement multithreaded pathfinding in an attempt to increase performance, but if anything, performance seems to actually decrease when I enable multithreading. Is there anything I ...
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87 views

Pi Calculator Using BBP (Bailey–Borwein–Plouffe) - Written in Cython With MPFR

I wrote a Pi Calculator using the BBP Algorithm in Cython. My specific goals are make the code more legible and more performant. This is a purely academic script in order to teach me how to implement ...
5
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73 views

Neural Network Written in Python is Extremely Slow

I coded a basic feedforward neural network with all pure python with the exception of numpy in order to better understand how neural networks work. It works, but the only problem is it is extremely ...
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2answers
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Get exactly `n` unique randomly sampled rows per category in a Dataframe

I want to get exactly n unique randomly sampled rows per category in a Dataframe. This proved to be involve more steps than the description would lead you to ...
5
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0answers
366 views

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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56 views

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 ...
5
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1answer
75 views

Evaluator for adding and subtracting algebraic expressions

I wrote a little program that adds and subtracts some algebraic expressions. In my code (2 x 3) represents \$2x^3\$. The purpose of this post is to get some ...
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345 views

Optimizing Graph Algorithms for Floyd Warshall and Johnson Algorithm

I am trying to implement and compare Floyd Warshall and Johnson Algorithm(for Sparse Graphs). I have written the following code which produces correct output values for the all pair shortest paths. ...
5
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217 views

Speeding up the implementation of Stochastic Gradient Ascent in Python

I am implementing a time-dependent Recommender System which applies BPR (Bayesian Personalized Ranking), where Stochastic Gradient Ascent is used to learn the parameters of the model. Such that, one ...
5
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0answers
951 views

Python code to calculate STM CRC32

I have code to calculate STM CRC32 in python. It works well but I'm shocked from time when I see how much it takes. Namely calculating for 5120 bytes takes about 20ms (or even more)! Now I'm thinking ...
5
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188 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 ...
5
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0answers
59 views

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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0answers
67 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. ...
5
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0answers
142 views

Simple HTTP router package

I have created a router/micro-framework. I have split my code into multiple files by responsibility. All files are in the same directory. Would you recommend any way of improving it ? The most ...
5
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0answers
806 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 ...
5
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0answers
165 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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0answers
245 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.). ...
5
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0answers
678 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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467 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 ...
5
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0answers
149 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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