# CMMutableDataBlockBuffer.MemoryPool Optimize memory allocations when working with large block buffers. ``` final class MemoryPool ``` ## Overview This is a memory allocation service that holds a pool of recently deallocated memory. Its purpose is to speed up subsequent allocations of the same size. You should use a pool in cases where you need to repeatedly allocate large blocks of memory, such as a video encoding app that outputs compressed data. This object allocates memory by page. It doesn’t sub-allocate memory within pages, so don’t use it to allocate small blocks. A pool instance deallocates memory if it isn’t reused in `ageOutDuration`, so that short-term peak usage doesn’t cause persistent bloat. ## Topics ### Initializers [`init(ageOutDuration: TimeInterval)`](/documentation/CoreMedia/CMMutableDataBlockBuffer/MemoryPool/init(ageOutDuration:)) ### Instance Methods [`func flush()`](/documentation/CoreMedia/CMMutableDataBlockBuffer/MemoryPool/flush()) Release all memory that the pool was waiting to deallocate. [`func makeBlockBuffer(copying: UnsafePointer) -> CMMutableDataBlockBuffer`](/documentation/CoreMedia/CMMutableDataBlockBuffer/MemoryPool/makeBlockBuffer(copying:)) Creates a block buffer by copying the given audio buffer list. [`func makeBlockBuffer(count: Int) -> CMMutableDataBlockBuffer`](/documentation/CoreMedia/CMMutableDataBlockBuffer/MemoryPool/makeBlockBuffer(count:)) Creates a block buffer with `count` number of bytes. ## Relationships ### Conforms To [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) --- 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)