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Questions tagged [memory-optimization]

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Memory Optimization is a subset of Optimization: it is the goal of reducing the memory consumption (the amount of memory used during compile or run time) of your program or of a specific algorithm

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1answer
52 views

Python : adding a columns with count of missing values by row

I have a big python data-frame and I am trying to add a column to it with average number of missing values by row. I have inherited some code that is working but I'd like to reduce memory usage by ...
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Improving interactive component performance with constant image translation

I am making this React Component for an interactive eye that moves and tracks the user's mouse cursor wherever it goes to in the webpage. However, I faced 3 problems while doing so. The eye moves as ...
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1answer
1k views

Updating number of votes with a “Like” button

I have a "Like" button in my iOS app that updates the votes every time it's tapped. Just like Facebook, Instagram, ProductHunt, etc. I have a custom cell where that ...
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How can this VHDL code for a 64-bit timer be improved to use less resources?

I have code for a 64-bit timer register which can take in a 32-bit slice and depending on the inputs, place the slice in the high side or the low side, or increment the counter. ...
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1answer
78 views

Simple C++ Dynamicly allocated Matrix with only one memory allocation [closed]

I was bothered with existing matrix allocation methods that take variable rows and columns, so I made a small class that only needs one memory allocation. ...
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0answers
114 views

C# class to dump the memory of a process in several formats

I made this because I couldn't find any good C# classes/libraries that allow you to dump the contents of a process' memory into a file or a byte array. I haven't tested this on 32 bit systems but it ...
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2answers
107 views

Java 8: Memory/Run-time Performance optimization to transform Json structure

Here is the sample Students json am processing ...
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1answer
104 views

Adding 1 million combinations of numbers to a file

The code adds approximately 1,720,000 different combinations of numbers to a file, some_other_file.txt. The numbers range from 2 digits long to 16 digits long. I ...
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1answer
1k views

Clustering using k-medoids

This is the program function code for clustering using k-medoids ...
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1answer
52 views

Optimise python functions for speed

Any one can help me optimise those three functions? I did profiling and timing of my original python file and found that most calls and time duration was because of those three functions. The three ...
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3answers
3k views

In place solution to remove duplicates from a sorted list

I am working on the problem removeDuplicatesFromSortedList Given a sorted array nums, remove the duplicates in-place such that each element appear only once and ...
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0answers
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Reduce size of minesweeper program to fit in qr code

I saw a guy who fit snake in a qr code and I wanted to do the same thing but with minesweeper. The maximum amount of data a qr code can hold is 3kb. My c program, without any compiler magic, takes up ...
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1answer
81 views

Workbook _open copy-paste reference sheet (30k+lines) from other workbook on change only

Working on finding a way to reduce in-cell formula size and memory usage of my excel workbook, i came up with the idea to "load" (copi-paste) the reference sheet i was mentioning a lot with ...
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1answer
946 views

Huffman Coding library implemented in C

I have written a small library for C that implements the Huffman coding algorithm as outlined in David Huffman's paper on Minimum-Redundancy Codes, and a small test program to implement it. The ...
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3answers
293 views

Compression Library for C using Huffman Coding

This is an update to a question I posed nearly two years ago about my implementation of Huffman Coding which I had written in C. Since then I have had time to grow as a programmer and have managed to ...
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1answer
61 views

Improving efficiency of download code

I'm in the process of reviewing some old code released by an old colleague. We have a cronjob that executes once in an hour to download some thumbnails: the paths to the thumbnails are stored in a ...
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3answers
113 views

Optimize Memory Java String Array

I was trying to solve one programming challenge : First input is a list of connections which is made of pair of IPv4 address. Each IP has its own state which starts with false, each connection also ...
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1answer
43 views

TypeScript: Object Duplication impact on performance

For a library I am working on, I have created a class WatchableCollection which will monitor an endpoint of an API for updates and issue events (...
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1answer
292 views

Hackerrank problem: Climbing the Leaderboard (Java)

I am solving the following Hackerrank problem: Climbing the Leaderboard. The problem statement: Alice is playing an arcade game and wants to climb to the top of the leaderboard and wants to track her ...
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2answers
63 views

Using deque for composing a string from 2 alternating stacks

We have 2 strings, say "JACK" and "DANIELS". We create two stacks from these strings, and then loop over them comparing first elements: whichever of the 2 goes first in lexicographic order gets popped ...
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2answers
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which for loop has better performance in javascript? [closed]

I can't find out which loop is better performance than another, if you know help me. I try about loops in js and performance in this site and this is code snippet, you can run and check. ...
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1answer
3k views

Bruteforce MD5 Password cracker

I just started learning Go, and I wanted to created a project to learn more about concurrency in go. I heard about Go's lightweight threads, so I wanted to give them a try. This program uses ...
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How does one increase effeciency of the memory functions of CUDA code?

I have the default code snippet that comes with the nvidia nsight eclipse V10.2, but I've modified it to do some profiling: ...
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1answer
63 views

Find number of unique paths to reach opposite grid corner

I have m x n grid. m >= 1 ; n >= 1 I have item in the top-left corner and need to reach bottom-right corner of the grid. Item can only move either down or right. I need to find possible unique ...
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Rust Iterator repeat_each

repeat_each transforms an iterator by repeating each value count times. It should be equivalent to ...
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1answer
50 views

Restructuring loop logic and its effect on allocations

I came across in a code base # TODO this seems very clumsy to duplicate the loop code like this? so I figured I'd give it a shot as a learning exercise. I'd like ...
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3answers
123 views

How can I optimize my code that uses nested for loops?

I am working to solve a problem where I need to determine if a Point lies on a line connecting two other Points. For example, ...
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2answers
66 views

SPOJ - ADDREV (Adding Reversed Numbers)

https://www.spoj.com/problems/ADDREV/ My answer to ADDREV challenge on SPOJ (link to the problem given above), written in JAVA, was accepted. However, the timing was 1.23 and memory used was 82M, ...
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1answer
100 views

Preserving principle of locality while performing memory allocation

In order to implement an efficient AST visitor preserving the principle of locality, I implemented some reference counting mechanism in C++ with the following set of features: All the newly allocated ...
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1answer
58 views

Implementation of Luhn Check Algorithm

I am beginner a 1st year cs student. I am taking CS50 and I completed the first week problem of implementing Luhn Check algorithm. Though my solution works I feel it's very sloppy and not efficient. ...
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Custom allocator for improved cache locality and fast iteration in C++

I am writing a custom allocator for my educational game engine project where I need to iterate through a collection of components(similar to Unity3D) every frame. There are game objects and every game ...
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1answer
64 views

Reverse String : Recursion

We have to reverse char[] using recursion. Input: ["H","a","n","n","a","h"] Output: ...
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Reduce memory usage/lag with multiple large JSON files coming in through XHR

I need to show a map of the United States using Leaflet, where if the user clicks on a state, the map zooms in to view all of the state's census tracts. I need to do this without a significant delay ...
3
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1answer
55 views

Symmetric decryption with javax.crypto

I'm trying to determine if this code could be a memory hog with huge files. Can anyone tell me if there is anything I can do to make this more memory efficient, or is this how java.crypto works? <...
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1answer
78 views

Permutation code in C

I am pretty new to competitive programming. It took me almost 3 hours to make this, initially I started with 4 for loops and then to make it scalable for sizes bigger than 4, I decided to turn this ...
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0answers
51 views

Batch normalization code optimization?

I am trying to implement Deep Quaternion Networks. I was able to implement the batch normalization technique. But it requires a lot of GPU memory. Is there any way I can optimize the code provided ...
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1answer
50 views

Optimizing a TFxIDF vectorization - Python 3.x [closed]

I am attempting to train many classifiers to test their performance with classifying tweets as being from a political bot, or not (a binary 0 or 1 classifier). My ...
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2answers
531 views

hexdump(): A memory layout utility to help debugging / understanding / optimising of C++ memory model

EDIT: Refer this answer for improved solution with incorporated feedback and extended functionality. eg Automatically hexdump both parts of a stack/heap obj like <...
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1answer
93 views

Further Optimizing a Segmented Sieve of Eratosthenes

I've implemented a Segmented Sieve of Eratosthenes that assumes each segment is about length \$ \sqrt{N}\$ for some upper limit \$N\$. I further optimized the function by skipping all the evens when ...
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2answers
62 views

Decrypt multiple 10Mb files with defined password

One operation of my Android project is to decrypt one file (chosen in a set of ~30 files for pagination1) of ~10 Mb each and I do this with the following: ...
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2answers
252 views

TrainSet Practice Problem from CodeChef

A dataset consisting of N items. Each item is a pair of a word and a boolean denoting whether the given word is a spam word or not. There shouldn't be a word included in the training set that's ...
4
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1answer
122 views

C# handling of images - is this best for memory usage?

I am working with a system that needs to consume product images uploaded by employees and resize them / add white padding to the sides to create square images to be consumed by our e-commerce site. I'...
3
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0answers
411 views

Kadane's algorithms to leetcode “121 Best Time to Buy and Sell Stock”

I employed the conventional Kadane's algorithms to solve a maximum subarray problem in leetcode Best Time to Buy and Sell Stock - LeetCode Description Best Time to Buy and Sell Stock ...
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0answers
131 views

Split a string into valid words

I am trying to solve this LeetCode question: Given a non-empty string s and a dictionary wordDict containing a list of non-empty words, add spaces in s to construct a sentence where each word ...
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1answer
91 views

Bank account balance program

Would my code be considered fairly optimal and efficient? If not, where can I look to improve the code? The program works just fine. Would this method scale well if the dictionary containing the ...
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1answer
154 views

Ternary Search Tree / N-Gram Model in Python

I implemented a word n-gram model using a character ternary search tree. It is intended to be passed a generator that yields a long sequence of words (from a corpus) and its requirements are that it ...
4
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1answer
212 views

Incremental Sieve of Eratosthenes Generator

So I was fiddling around with the Euler challenges. One of the things they mentioned in their discussions of the solutions is the Sieve of Eratosthenes and that you can only use it when you know an ...
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1answer
65 views

Optimizing away log function calls depending on global log level

I am a member of a university team designing a nanosatellite. We decided to implement our own (more lite) logging library to use, instead of, say, Google's glog, <...
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1answer
282 views

Custom malloc implementation

I have a malloc() implementation that relies purely on mmap. I'm fairly sure that it doesn't overwrite any of the internal ...
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2answers
94 views

Generate a large block diagonal covariance matrix with exponential decay

I am implementing Kalman filtering in R. Part of the problem involves generating a really huge error covariance block-diagonal matrix (dim: 18000 rows x 18000 columns = 324,000,000 entries). We denote ...

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