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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questions with no upvoted or accepted answers
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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 ...
18
votes
0answers
261 views
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 (...
15
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0answers
166 views
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:
...
8
votes
0answers
120 views
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 ...
8
votes
0answers
377 views
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 ...
8
votes
1answer
693 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 ...
7
votes
0answers
74 views
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:
...
7
votes
0answers
286 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 ...
7
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0answers
139 views
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
votes
0answers
896 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 ...
7
votes
0answers
98 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 ...
6
votes
0answers
105 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, ...
6
votes
0answers
170 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
votes
0answers
101 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
votes
0answers
105 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
votes
0answers
110 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 ...
6
votes
0answers
108 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 ...
6
votes
0answers
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 ...
6
votes
0answers
104 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
votes
0answers
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
votes
0answers
628 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
votes
0answers
516 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, ...
6
votes
0answers
741 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
votes
0answers
381 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
votes
0answers
396 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 ...
6
votes
0answers
415 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....
5
votes
0answers
36 views
Can I shorten this assembly code to test if a number is even?
Here is MIPS code to return 1 if a number is even, 0 otherwise:
isEven:
andi $t0, $a0, 1
li $t1, 1
sub $v0, $t1, $t0
jr $ra
My question is whether ...
5
votes
0answers
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
votes
0answers
567 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 ...
5
votes
0answers
671 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 ...
5
votes
0answers
212 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
votes
0answers
185 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
votes
0answers
58 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 ...
5
votes
0answers
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.
...
5
votes
0answers
384 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 ...
5
votes
0answers
728 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
votes
0answers
157 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:
...
5
votes
0answers
222 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
votes
0answers
668 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 ...
5
votes
0answers
434 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
votes
0answers
136 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 ...
5
votes
0answers
421 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
...
4
votes
0answers
38 views
Fast compression using a thread pool
This is my latest effort on RFC 1951 compression ( the widely-supported compression standard ) in Rust. It uses 2 extra threads to compute the LZ77 matches and the checksum in parallel with the ...
4
votes
0answers
42 views
upload multiple images and resize
I'm written PHP code to upload multiple images to server.
this function process maximum 10 images at one time and if the image width or height bigger than 2000px it will be resize , but the code is ...
4
votes
0answers
58 views
Naive Solver of Matrix with Periodic Boundary Conditions Feedback
I am creating an \$O(n)\$ solver for an \$Ax = b\$ system where \$A\$ has the form
\$
A = \begin{pmatrix}
a_1 & b_1 &&&d_{u}\\ c_1 & a_2 & b_2\\& \ddots & \ddots &...
4
votes
0answers
140 views
Cross-Entropy Minimization - Extreme Code Performance
I'm working on a multivariate cross-entropy minimization model (for more details about it, see this paper, pp. 32-33). It's purpose is to adjust a prior multivariate distribution (in this case, a ...
4
votes
0answers
70 views
3D Direct Convolution Implementation in C
For my project, I've written a naive C implementation of Direct3D convolution with periodic padding on the input. Unfortunately, since I'm new to C, the performance isn't so good.
By convention, all ...
4
votes
0answers
41 views
Small Automatic Differentiation Library
Introduction
As a programming exercise I recently wrote this automatic differentiation library based on forward accumulation. It should offer a simple way to create mathematical functions whose ...
4
votes
0answers
66 views
Integrator 2.0: A Simple Integrator in C++17
This is a follow up of A simple definite integrator class of a single variable in C++
I took most of the advice from the user: emma-x and some from user: sudo-rm-rf-slash
Here is my fully revised ...
