ParaView/Users Guide/Memory Inspector
As explained earlier, both the Information panel, and the Statistics inspector are prone to over and under estimate the total memory used for the current pipeline. The Memory Inspector, provides a mechanism to request the Operating System for the total memory used on the system.
The inspector can be accessed from the View menu. It provides assorted information including the physical (or virtual) memory used, physical (or virtual) memory available, and total physical (or virtual) memory present on each of the nodes hosting the process. Note that this is not process specific information, but information for the node hosting the process.
For performance reasons, the information is not automatically updated. The user is expected to hit the Refresh button to refresh the panel with the latest information.