# synchronize(resource:) Encodes a command that synchronizes the CPU’s copy of a managed resource, such as a buffer or texture, so that it matches the GPU’s copy. ``` func synchronize(resource: any MTLResource) ``` ## Parameters `resource` An [`MTLResource`](/documentation/Metal/MTLResource) instance — such as an [`MTLBuffer`](/documentation/Metal/MTLBuffer) or [`MTLTexture`](/documentation/Metal/MTLTexture) — with a [`storageMode`](/documentation/Metal/MTLResource/storageMode) property that’s equal to [`MTLStorageMode.managed`](/documentation/Metal/MTLStorageMode/managed). ## Discussion This method ensures the CPU can correctly read all the changes a GPU makes to a resource that uses the managed storage mode. For the resources you create with [`MTLStorageMode.managed`](/documentation/Metal/MTLStorageMode/managed), the CPU and GPU each have a copy of that resource. As the GPU modifies its copy, the CPU’s copy remains unchanged until you synchronize with a command, such as this one. The CPU can access the updated content from its copy of the resources after the synchronization command completes. > Note: > You can encode a command that selectively synchronizes parts of an ``doc://com.apple.metal/documentation/Metal/MTLTexture`` by calling the ``doc://com.apple.metal/documentation/Metal/MTLBlitCommandEncoder/synchronize(texture:slice:level:)`` method. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)