Allocatedcommitted

Allocatedcommitted is a concept used in computing to describe memory pages that have been both allocated and committed within a virtual memory system. It combines two distinct states: allocated memory (address space reserved for a process) and committed memory (the system has allocated physical backing, such as RAM or a page file). In practice, allocatedcommitted reflects memory that is guaranteed to be backed by physical storage, whereas allocated-but-not-committed memory is reserved but not yet guaranteed backing.

In Windows, memory is tracked as reserved, committed, and private. Reserved pages have an address range but no backing; committed pages have backing storage in RAM or the pagefile. The overlap corresponds to the portion of memory that is both allocated and committed. System monitoring tools may report metrics such as commit charge, commit limit, and various memory pools; understanding the allocatedcommitted portion helps assess pressure on the system.

In Linux, a related concept is Committed_AS, which measures memory that has been allocated by processes and is backed by RAM or swap. This metric, together with virtual size (VIRT) and resident set size (RSS), helps characterize memory usage and pressure.

Applications rely on the idea to avoid overcommit, maintain performance, and prevent out-of-memory conditions. Allocatedcommitted can be a diagnostic concept in monitoring dashboards to identify whether a system is reserving large address spaces with little backing, or if most allocated memory is already committed.

See also: virtual memory, memory commitment, reserved memory, committed memory, commit charge, Out-Of-Memory. Terminology varies by OS and tool, so exact definitions may differ.