# NSGetWindowServerMemory(_:_:_:_:) Returns the amount of memory being used by a context. ``` func NSGetWindowServerMemory(_ context: Int, _ virtualMemory: UnsafeMutablePointer, _ windowBackingMemory: UnsafeMutablePointer, _ windowDumpString: AutoreleasingUnsafeMutablePointer) -> Int ``` ## Discussion Calculates the amount of memory being used at the moment by the given `context`. If `NULL` is passed for `context`, the current context is used. The amount of virtual memory used by the current context is returned in the int pointed to by `virtualMemory`; the amount of window backing store used by windows owned by the current context is returned in the int pointed to by `windowBackingMemory`. The sum of these two numbers is the amount of the memory that this context is responsible for. Calculating these numbers takes some time to execute; thus, calling this function in normal operation is not recommended. If `nil` is not passed in for `windowDumpStream`, the information returned is echoed to the specified stream. This fact can be useful for finding out more about which windows are using up your storage. Normally, `NSGetWindowServerMemory` returns 0. If `NULL` is passed for `context` and there’s no current display context, this function returns –1. --- 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)