monitor
The VMS monitor utility returns dynamic information about VMS system performance for a specified component. Some of the most useful components to monitor are:
• monitor system — monitors system statistics
• monitor process/topcpu—monitors the process currently using the most CPU
• monitor process/topdio—monitors the processes that use the most disk I/O
• monitor process/topbio—monitors the processes that use the most buffered I/O
• monitor process/topfault— monitors the processes that cause the most page faults
• monitor pool—monitors non-paged pool statistics