Varena 1.2.0

.NET 6.0
dotnet add package Varena --version 1.2.0
NuGet\Install-Package Varena -Version 1.2.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Varena" Version="1.2.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Varena --version 1.2.0
#r "nuget: Varena, 1.2.0"
#r directive can be used in F# Interactive, C# scripting and .NET Interactive. Copy this into the interactive tool or source code of the script to reference the package.
// Install Varena as a Cake Addin
#addin nuget:?package=Varena&version=1.2.0

// Install Varena as a Cake Tool
#tool nuget:?package=Varena&version=1.2.0

Varena Build Status Coverage Status NuGet

<img align="right" width="160px" height="160px" src="img/varena.png">

Varena is a .NET library that provides a fast and lightweight arena allocator using virtual memory.


  • Create very large continuous byte buffers and arrays (e.g 1 TiB) of data without committing the virtual memory to the physical memory.
    • Only use the memory that is allocated, not the total capacity reserved!
  • Fast bump allocator with a commit per block (default is 64 KiB of memory committed)
  • Use VirtualBuffer for manipulating bytes.
  • Use VirtualArray<T> for manipulating a dynamic array of unmanaged data.
  • Compatible with .NET6.0+ and on all platforms (Windows, Linux, macOS)


using Varena;

// The manager keeps track of all created arenas (buffers, arrays)
using var manager = new VirtualArenaManager();

// Create a byte buffer and reserve 1 GiB of continuous memory (but not yet allocated)
var arena1 = manager.CreateBuffer("Arena1", 1 << 30);
// Allocate 1024 bytes -> The arena commits a block 64 KiB of memory (configurable)
var span = arena1.AllocateRange(1024);
span[0] = 1;
// Allocate 2048 bytes -> The arena keeps allocating in the previous commit block of 64 KiB
var span2 = arena1.AllocateRange(2048);
span2[0] = 1;

// Create a data array and reserve 1 MiB of continuous memory (but not yet allocated)
var arena2 = manager.CreateArray<Guid>("Arena2", 1 << 20);
// Allocate sizeof(Guid) * 1024 bytes -> The arena commits a block 64 KiB of memory (configurable)
var span3 = arena2.AllocateRange(1024);
span3[0] = Guid.NewGuid();


You will find more details about how to use Varena in this user guide.


This software is released under the BSD-Clause 2 license.


Alexandre Mutel aka xoofx.

Product Versions
.NET net6.0 net6.0-android net6.0-ios net6.0-maccatalyst net6.0-macos net6.0-tvos net6.0-windows net7.0 net7.0-android net7.0-ios net7.0-maccatalyst net7.0-macos net7.0-tvos net7.0-windows
Compatible target framework(s)
Additional computed target framework(s)
Learn more about Target Frameworks and .NET Standard.
  • net6.0

    • No dependencies.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories (1)

Showing the top 1 popular GitHub repositories that depend on Varena:

Repository Stars
Main repository for the stark compiler frontend + vscode integration + language specs
Version Downloads Last updated
1.2.0 133 9/18/2022
1.1.0 135 9/17/2022
1.0.1 150 9/11/2022
1.0.0 147 9/10/2022