---
title: DISPATCH_MEMORYPRESSURE_CRITICAL
framework: dispatch
role: symbol
role_heading: Global Variable
path: dispatch/dispatch_memorypressure_critical
---

# DISPATCH_MEMORYPRESSURE_CRITICAL

The system memory pressure condition is at the critical stage.

## Declaration

```swift
var DISPATCH_MEMORYPRESSURE_CRITICAL: Int32 { get }
```

## Discussion

Discussion Apps should release as much memory as possible.

## See Also

### Memory Pressure Event Flags

- [DISPATCH_MEMORYPRESSURE_WARN](dispatch/dispatch_memorypressure_warn.md)
- [DISPATCH_MEMORYPRESSURE_NORMAL](dispatch/dispatch_memorypressure_normal.md)