memoryCommitLimit reports, in bytes, the total size of virtual memory that Windows can commit before it would need to grow the paging file. Since the limit is a soft ceiling when the paging file is allowed to expand, an admin watching this counter alongside memoryCommittedBytes can spot a host that is close to running out of committable memory before allocations start failing. For example, if committed bytes climbs to within a few percent of this limit on a monitored NT server, it is a signal to add RAM or enlarge the paging file before applications hit out-of-memory errors.