Questions tagged [memory-management]
Memory management is the act of managing computer memory by allocating portions of memory to programs as well as freeing memory so that it can be re-used.
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Unmanaged byte array to managed structure
I have a need to turn byte arrays into various structures.
First version:
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malloc in main() or malloc in another function: allocating memory for a struct and its members
When initializing a struct in C, we can allocate memory inside the main function or within another function and return a pointer to the newly created struct. This ...
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A C++17 `std::allocator` implementation
This is an implementation of C++17 std::allocator under the name my_std::allocator, with deprecated stuff omitted for simplicity....
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C++ shared_ptr memory pool
I put together this little memory pool class to help avoid the costs associated with heap allocation and deallocation of objects that are frequently created & destroyed. It creates C++ standard <...
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A custom, highly-specialized, special-purpose standard-compliant C++ allocator
Brief Preface
I recognize that there are many nuances and requirements for a standard-compatible allocator. There are a number of questions here covering a range of topics associated with allocators....
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Wipe sensitive information from memory in Python
I have come up with the following method to remove sensitive information with the help of the garbage collector:
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Initializing and managing many references in multithreaded control application
I have a large multi-window GUI program (implemented with MFC) that controls a variety of physics experiment apparatus. When the user starts the main function of the program (the "experiment" run), a ...
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Constructor for a packagetarget struct
As many of you know goto is usually signs of code smell. However I thought this could be an appropriate case, and would like confirmation or criticism.
Unnecessary ...
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Dynamically-resizable array implementation, for use in a game-dev-related library
I've been working on a library that includes a list-like structure, which I use internally multiple times to store different types of structs. However, I'm not entirely confident with my ability to ...
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Implementation of memset_s based on C11 standard
The following code attempts to implement memset_s() based on section K.3.7.4.1 of the ISO/IEC 9899:201x N1570 draft:
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Write/read efficiently dataframe objects into memory or disk [closed]
i'm running a for loop that loops over all the rows of a pandas dataframe, then it calculates the euclidean distance from one point at a time to all the other points in the dataframe, then it pass the ...
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Fixed Size Resource Array with Versioned Indexes
I'm trying to implement a fixed sized array that uses versioned keys for dangling safety. This structure is similar to a slot map data structure, with the exception that this does not automatically ...
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Memory managment for RPC code in C
My team has been given care of an old embedded C project. Its main part is a security critical RPC API and I'm trying to create a new design of its internal interfaces to make it more robust against ...
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LRU implementation in C++ using a LinkedList
Explanation : I am adding new elements in the list until the window runs out. Head will have the earliest element and tail will have the most recent element. Once the window is over, every addition ...
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My malloc() in C using mmap()
My latest school project was to implement malloc(), free(), realloc() and ...
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Wrapping C++ library in C++/CLI using shared_ptr
Background: I'm writing C++ code after a fairly long time, so I may not be up to date on the best practices, so please bear with me. I'm only trying to improve and learn.
Problem I need to write a ...
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json2CSV fails because of lack of RAM memory
I run this code on my Heroku Node.js server in order to get CSV for few hundred rows, but it fails with R14 - Memory Quota Exceeded.
It worked fine when there were ...
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C++ OpenGL GPU resource wrapper pattern
So with OpenGL(and I'm assuming other GPU APIs) you create different buffers/programs/etc that live on the GPU and you are given a handle to them when created. For instance, if you want a buffer to ...
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Macro for allocation in C
As we all know, the syntax of allocating memory is a bit clunky in C. The recommended way is:
int *p;
int n=10;
p = malloc(n*sizeof *p);
You can use ...
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Yet Another Dijkstra with real data and drawing
I've been assigned to use Dijkstra's algorithm in order to find the shortest path on real data, more specifically on Luxembourg's map.
The map is an .xml file with the following structure.
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Implementation of static_vector using an array of std::aligned_storage, with std::launder and forwarding
I'm trying to expand on the implementation of static_vector on the std::aligned_storage reference page, but would like to split it into two parts. First, an ...
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Header-only vector implementation in C
I tried to make a generic, header-only vector thingy I can use in other projects in the future. I omitted documentation comments because it's already quite long.
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Tracker for object construction, copy, and movement
I made an object tracker for debugging and testing purposes called ccm_counter (construction, copy, move counter). It counts constructor, copy and move calls. It ...
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Simple Malloc Implementation
I've written an implementation of malloc, realloc, and free. I wanted to make a ...
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malloc() and free() for Linux with system calls
I have written an implementation of malloc() and free() for Linux using the sbrk() system ...
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Lowest open space in memory
I am writing a simple compiled programming language. Everything but the bytecode interpreter can run as slow as possible, but I would like the interpreter to fun fast, because that's why I made it ...
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Reconstructing Matrix scattered over many MPI ranks
I have a program that does some matrix computations using MPI (MPICH). Each rank has a slice of the matrix and does the computations on their slice to get a new slice of the matrix. Sometimes I need ...
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Bash script to send notifications when low on ram
Backstory
Recently, we've changed the PCs at my workplace to un Linux Mint.
It works amazing, is blazing fast and the adjustment time was very short.
However, I noticed my PC would freeze completely,...
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Fixed-sized memory pool in C
I'm learning C and I am currently implementing a memory pool.
I'm writing it in steps, first I implemented a fixed-sized memory pool then I will try to implement a memory pool with a known size of ...
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Yet Another Non-Intrusive Reference Counted Smart Pointer Implementation
I needed a reference counted smart pointer for my project, and for some reason early in my project, I decided that I did not like the std::shared_ptr. I can't ...
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Object pool and sorted linked list in C
Update: Have implemented some of the suggestions:
See GitHub: https://github.com/BostonBrooks/MathsGame/tree/master/Object_Pools_Demo
I am implementing a game engine where I have a sorted list of ...
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Memory release after joblib.Parallel [python]
Stuck with the issue with memory consumption - after running joblib's Parallel, deleting results and gc.collect() -ing I still have increased memory (checking by htop for process line). Found no way ...
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C++ - Trie Implementation
I am trying to learn trie and this is my first implementation. I started off with the idea of being able to handle different data types for key and value; however, I found the data structure a bit ...
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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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C# version of C++ shared_ptr
I need something akin to C++'s shared_ptr. Essentially I need an IDisposable item that I can ensure is cleaned up as soon as possible once all references have been removed, but this resource will be ...
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Python lexicon class
First time around Code Review so please be gentle (and I am happy for comments on which angles of this post are a good fit and which less so). I'm not pretty much used to software engineering in ...
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Deep-copyable unique_ptr wrapper with std::visit-like feature
I'm writing a simple wrapper for std::unique_ptr, which copies the pointed object when copied.
Unlike this wrapper, it properly copies derived classes if
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Pre-baked Hash table with a flat memory layout
A few notes:
There is currently no non exception-based way of knowing whether a key is present in the table or not. This is intentional for my use case.
Unlike the lookup process, the baking process ...
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Pandas data extraction task taking too much memory. How to optimize for memory usage?
I need to process some data (one of its columns contains a json/dict with params- I need to extract those params to individual columns of their own; catch- some rows have some parameters, others have ...
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Print strings in order with dynamic arrays
I accomplished the following task to practice allocating on the heap.
reading words from stdin
sorting them in lexicographical order
printing the sorted words to stdout
To accomplish this is ...
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Object pool for allocating generic objects in aligned memory
I made a single header object pool for use in personal projects. It's supposed to be easy to use, cross-platform and thread safe. It uses a free list for allocations and a hashmap for dereferencing ...
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Block Allocation in Fixed-Size Block Allocator
The following routine is the block-allocation procedure in a fixed-size allocator being written for library use. It is designed to be accessed from C++ (the un-mangled symbol name is ...
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A Stack Template
Why you're here:
Today I bring you a simple Stack Machine and a Lot of questions. I am trying to gain a little bit more understanding of pointers, memory management and templates and thought a Stack ...
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Tail implementation using a dynamic queue library
As per K & R exercise 5-13
Write the program tail, which prints the last n lines of its input. By default, n is 10, say, but it can be changed by an optional argument, so that
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SoundBoard in C++ Using Qt
I've been working on a soundboard software for tabletop games audio immersion in C++ using Qt. The software consists of 2 tabs who provides to a game master a set of individual sounds or scenes to be ...
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Implementation of K&R Malloc
This is a one file implementation of K&R Malloc. It's passed all test cases I've run on it, so I would like to request a code review.
my_malloc.c
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Eight Queens Recursive
I am working on a Java textbook chapter on recursion, and I am to implement an Eight Queens solution using recursion. Though I know that I am to post working code in Code Review, I do believe this ...
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Custom fixed-space block memory allocator
This is a fixed-size memory allocator.
The core memory block is an unsigned char pointer which gets allocated on initialization. Other than that, it has pretty basic allocation and block safety ...
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Yet another implementation of malloc() in C
I'm really curious to know someone else's opinion on this implementation. Specifically, I would be interested to know the way you would have implemented it. Here the list of issues I've found with in ...
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