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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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5
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1answer
81 views

How to speed up scraping large amounts of data with Python

I have the following code: ...
3
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0answers
62 views

Memcpy function optimzation

Here is my memcpy algorithm I've been working on: ...
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1answer
65 views

Find a sum using just two different digits

The problem statement was pretty easy and I was able to run half of the test cases, but some of the test cases in the end gave me the error of memory limit reached. What can I do here to improve the ...
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3answers
95 views

DFS-based exhaustive word grid search

I have implemented an exhaustive depth-first grid search that searches for all possible words in the 8 connected regions. Is there any way I can make this faster or memory efficient than it is now? I ...
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1answer
62 views

Minimum number of copies of an application a company needs to purchase

Some applications from vendors are allowed to be installed on multiple computers per user with specific restrictions. In our scenario, each copy of the application (ID 374) allows the user to install ...
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1answer
2k views

Clustering using k-medoids

This is the program function code for clustering using k-medoids ...
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0answers
27 views

How to optimize ARIMA walk-forward validation?

Just fitted and ARIMA model model = ARIMA(Preco1, order=(6,1,2)) model_fit = model.fit(disp=0) In order to do the walk-forward validation of an ARIMA model on a ...
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1answer
104 views

Follow-up: How can we optimizing Java BigInteger operations?

This is the follow up question of How can we optimizing Java BigInteger operations? Problem Reduce the number to 1 in a minimal number of steps, following the rules: ...
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1answer
57 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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0answers
24 views

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 ...
5
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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 ...
3
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0answers
44 views

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
80 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
199 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
113 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
57 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 ...
4
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0answers
71 views

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
82 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
1k 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
684 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 ...
5
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1answer
66 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 ...
3
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3answers
115 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
44 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 (...
3
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1answer
790 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
64 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
87 views

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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0answers
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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
64 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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0answers
56 views

Rust Iterator repeat_each

repeat_each transforms an iterator by repeating each value count times. It should be equivalent to ...
2
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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
124 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, ...
4
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2answers
82 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 ...
3
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1answer
59 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. ...
3
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0answers
37 views

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 ...
4
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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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0answers
35 views

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
56 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? <...
2
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1answer
79 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 ...
3
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0answers
53 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 ...
2
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1answer
51 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 ...
8
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2answers
574 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 <...
2
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1answer
108 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
263 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
460 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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