The RSS metric for each component refers to the Resident Set Size (portion of memory occupied by a process in main memory). Per-task memory snapshots are summed up across all tasks on a node to derive on-node memory highwater and memory usage in megabytes.

  The highwater number represents the total memory footprint of a process including data paged out to disk (virtual memory).Per-task memory snapshots are summed up across all tasks on a node to derive on-node memory highwater and memory usage in megabytes.