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Showing content from https://docs.unity3d.com/Manual/performance-native-memory-allocator-reference.html below:

Manual: Native memory allocators reference

Customizing native memory allocators

Native memory allocator examples

Native memory allocators reference

You can control how native memory is allocated through using command line arguments, or using the settings in the Unity Editor (Edit > Project Settings > Memory Settings). For information on how to customize native memory allocators, refer to Customizing native memory allocators.

Project Settings > Memory Settings, showing a selection of Player memory settings

The following table contains information about each allocator setting, plus their command line arguments, and their default values:

Main Allocators

These allocators are the ones that Unity uses for most allocations.

Main Allocator

The primary allocator Unity uses for most allocations. It has the following settings:

Setting Description Command line argument Default value Main Thread Block Size Block size of dedicated main thread allocator. memorysetup-main-allocator-block-size 16777216 bytes Shared Thread Block Size Block size of shared thread allocator. memorysetup-thread-allocator-block-size 16777216 bytes Gfx Allocator

The allocator Unity uses for CPU allocations related to the Gfx system. It has the following settings:

Setting Description Command line argument Default value Main Thread Block Size Block size of the dedicated main thread Gfx allocator. memorysetup-gfx-main-allocator-block-size 16777216 bytes Shared Thread Block Size Block size of the shared thread Gfx allocator. memorysetup-gfx-thread-allocator-block-size 16777216 bytes Other Allocators

Allocations used for type trees and the file cache. It has the following settings:

Setting Description Command line argument Default value File Cache Block Size The file cache has its own allocator to avoid fragmentation. This is its block size. memorysetup-cache-allocator-block-size 4194304 bytes Type Tree Block Size The type trees have their own allocator to avoid fragmentation due to many small allocations. This is its block size. memorysetup-typetree-allocator-block-size 2097152 bytes Shared Bucket Allocator

The bucket allocator shared between the main allocators. It has the following settings:

Setting Description Command line argument Default value Bucket Allocator Granularity Step size for buckets in the shared allocator. memorysetup-bucket-allocator-granularity 16 bytes Bucket Allocator BucketCount Number of bucket sizes. memorysetup-bucket-allocator-bucket-count 8 Bucket Allocator Block Size Size of memory blocks used for buckets. memorysetup-bucket-allocator-block-size Editor: 8388608 bytes
Player: 4194304 bytes Bucket Allocator Block Count Maximum number of blocks to be allocated. memorysetup-bucket-allocator-block-count Editor: 8
Player: 1 Fast Per Thread Temporary Allocators

The Thread Local Storage (TLS) allocator that handles very short-lived allocations.

Allocator Description Command line argument Default value (in bytes) Main Thread Block Size The initial size for the main thread stack. memorysetup-temp-allocator-size-main Editor: 16777216
Player: 4194304 Job Worker Block Size Size of each job worker in the Unity job system. memorysetup-temp-allocator-size-job-worker E262144 Background Job Worker Block Size Size for each background worker. memorysetup-temp-allocator-size-background-worker 32768 Preload Block Size The preload manager stack size. memorysetup-temp-allocator-size-preload-manager Editor: 33554432
Player: 262144 Audio Worker Block Size Each audio worker threadâs stack size. memorysetup-temp-allocator-size-audio-worker 65536 Cloud Worker Block Size Cloud worker threads stack size. memorysetup-temp-allocator-size-cloud-worker 32768 Gfx Thread Blocksize The main render threads stack size. memorysetup-temp-allocator-size-gfx 262144 GI Baking Blocksize Each GI worker threadâs stack size. memorysetup-temp-allocator-size-gi-baking-worker 262144 NavMeshA mesh that Unity generates to approximate the walkable areas and obstacles in your environment for path finding and AI-controlled navigation. More info See in Glossary Worker Block Size Nav meshThe main graphics primitive of Unity. Meshes make up a large part of your 3D worlds. Unity supports triangulated or Quadrangulated polygon meshes. Nurbs, Nurms, Subdiv surfaces must be converted to polygons. More info See in Glossary worker threads stack size. memorysetup-temp-allocator-size-nav-mesh-worker 65536 Fast Thread Shared Temporary Allocators

Fast linear allocator for short lived allocations shared between threads.

Allocator Description Command line argument Default value (in bytes) Job Allocator Block Size The round robin linear thread allocator Unity mainly uses for the job worker threads. memorysetup-job-temp-allocator-block-size 2097152 Background Job Allocator Block Size The linear allocator for the background workers that allows longer lived allocations. memorysetup-job-temp-allocator-block-size-background 21048576 Job Allocator Block Size on low memory platforms Platforms with less than 2 GB memory use this size for both the job workers and the background jobs. memorysetup-job-temp-allocator-reduction-small-platforms 262144 Profiler Allocators

Allocators that Unity uses exclusively for the Profiler so that they donât interfere with the applicationâs allocation patterns. They have the following settings:

Setting Description Command line argument Default value ProfilerA window that helps you to optimize your game. It shows how much time is spent in the various areas of your game. For example, it can report the percentage of time spent rendering, animating, or in your game logic. More info See in Glossary Block Size The block size for the main part of the Profiler. memorysetup-profiler-allocator-block-size 16777216 Editor Profiler Block Size Block size for the Editor part of the Profiler. This isnât present in players. memorysetup-profiler-editor-allocator-block-size 1048576 bytes Shared Profiler Bucket Allocator

Shared bucket allocator for the Profiler and Editor Profiler allocators. Not present on low memory platforms. It has the following settings:

Setting Description Command line argument Default value Bucket Allocator Granularity Step size for buckets in the shared allocator. memorysetup-profiler-bucket-allocator-granularity 16 bytes Bucket Allocator BucketCount Number of bucket sizes. For example, if the value is 4, the sizes are 16 bytes, 32 bytes, 48 bytes, and 64 bytes. memorysetup-profiler-bucket-allocator-bucket-count 8 Bucket Allocator Block Size Size of memory blocks used for buckets. memorysetup-profiler-bucket-allocator-block-size Editor: 33554432 bytes
Player: 4194304 bytes Bucket Allocator Block Count Maximum number of blocks to be allocated. memorysetup-profiler-bucket-allocator-block-count Editor: 8
Player: 1 Additional resources

Customizing native memory allocators

Native memory allocator examples

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