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