# Native memory allocators reference > Reference for native memory allocator settings 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](/engine/6000.5/manual/analysis/performance-memory/native-memory/memory-allocator-customization.md). **Project Settings > Memory Settings, showing a selection of Player memory settings:** ![](/api/media?file=/engine/6000.5/media/images/memory-native-settings.png) The following table contains information about each allocator setting, plus their [command line arguments](/engine/6000.5/manual/unity-editor/command-line-arguments.md), 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. This property is automatically disabled when you use [mimalloc](https://microsoft.github.io/mimalloc/). | `memorysetup-main-allocator-block-size` | `16777216` bytes | | **Shared Thread Block Size** | Block size of shared thread allocator. This property is automatically disabled when you use [mimalloc](https://microsoft.github.io/mimalloc/). | `memorysetup-thread-allocator-block-size` | `16777216` bytes | | **Mimalloc enabled** | Uses [mimalloc](/engine/6000.5/manual/analysis/performance-memory/native-memory/allocators.md#mimalloc) instead of the main thread and shared thread. | None | Disabled | ### 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` bytesPlayer: `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](/engine/6000.5/manual/analysis/performance-memory/native-memory/allocators.md#tls) 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 thread's 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 thread's stack size. | `memorysetup-temp-allocator-size-gi-baking-worker` | `262144` | | **NavMesh Worker Block Size** | Nav mesh worker threads stack size. | `memorysetup-temp-allocator-size-nav-mesh-worker` | `65536` | ## Fast Thread Shared Temporary Allocators [Fast linear allocator](/engine/6000.5/manual/analysis/performance-memory/native-memory/allocators.md) 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](/engine/6000.5/manual/analysis/profiler.md) so that they don't interfere with the application's allocation patterns. They have the following settings: | **Setting** | **Description** | **Command line argument** | **Default value** | | ------------------------------ | ------------------------------------------------------------------------------ | -------------------------------------------------- | ----------------- | | **Profiler 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 isn't 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` bytesPlayer: `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 * [Native memory allocators](/engine/6000.5/manual/analysis/performance-memory/native-memory/allocators.md) * [Customizing native memory allocators](/engine/6000.5/manual/analysis/performance-memory/native-memory/memory-allocator-customization.md) * [Native memory allocator examples](/engine/6000.5/manual/analysis/performance-memory/native-memory/allocator-examples.md) * [Mimalloc documentation](https://microsoft.github.io/mimalloc/index.html)