OpenVMS System Management Utilities Reference Manual

The command in this example requests that kilobyte map rate statistics collected for SCS be displayed for each node in the cluster. The display shows block transfer map activity between the node CURLEY and the hierarchical storage controller (HSC) SHEMP. Note that each node in the cluster is identified by its SCS node name. Note that the Current Process is always the process running MONITOR, because MONITOR is running when each measurement is made. For performance reasons, MONITOR does not synchronize the scanning of process state data structures with operating system use of those structures. It is therefore possible that MONITOR will display certain anomalous state indications. The commands in this example generate and display a PROCESS STATES summary. Note that since use of the Return key is not permitted within a single MONITOR command following the MONITOR>, prompt, the MONITOR command is entered at DCL level. The summary shows that, on the average, 14.1 percent of processes were swapped out for the summarized period. Note that the summary was requested for data covering only the hour between 1 P.M. and 2 P.M., although the input file could have contained data covering a longer period. Note that the bar graph version of the SYSTEM class (shown in Example 2) contains the following data, which differs from the tabular version: Any process that MONITOR designates as a top user process must be swapped in at the beginning and ending of the display interval or at the beginning and ending of the entire period covered by a summary. When the lower bar graph (top user) and the corresponding upper bar graph (overall system measure) are tracking the same statistic for the same interval (as in Example 2), it is reasonable to compare the two graphs. This will be the case in the following situation: Otherwise, you should exercise care in making such comparisons because the top user statistic is always CURRENT, while the overall system measure statistic may be CURRENT, AVERAGE, MAXIMUM, or MINIMUM. Rates for top users are calculated based on the interval between two successive screen displays, while overall system rates are based on the collection interval. These two interval values can be different whenever one or more classes are being monitored with the SYSTEM class, or when /INTERVAL and /VIEWING_TIME values differ. While other upper boundary figures for the SYSTEM class bar graphs are constants, the figures for Free List Size and Modified List Size are derived from the physical memory configuration and system parameters of individual systems. The upper boundary figure for the Free List is the number of pages available after deducting the pages permanently allocated to the operating system. This figure, sometimes referred to as balance set memory, is the number of pages that can be allocated to processes, the Free List, and the Modified List. The upper boundary figure for the Modified List is the value of the MPW_HILIMIT system parameter. Note that both upper boundary figures are calculated when the MONITOR request is initiated and do not change thereafter. To see which processes have the highest RBS fault rates, issue the MONITOR PROCESSES/TOPRBS command. Note that, because vector consumers can use either the vector CPU, the scalar CPU, or both components of a vector-present processor, the vector CPU time in the VECTOR class display is not a strict measure of the actual usage of the processor's vector CPU component. Rather, it indicates the time during which a scheduled vector consumer has reserved both vector CPU and scalar CPU components of the vector-present processor for its own exclusive use. The VECTOR class consists of the data item Vector Scheduled Rate, which is represented by a display of statistics that show the rates of 10-millisecond clock ticks per second during which vector consumers have been scheduled on each vector-present CPU. This example shows the VECTOR class display for a multiprocessing system containing two vector-present processors, CPU 0 and CPU 4. Displayed statistics represent rates of 10-millisecond clock ticks per second. For an average of 13 ticks per second over the last collection interval, vector consumers have been scheduled on CPU 0. For an average of 58 ticks per second over the last collection interval, vector consumers have been scheduled on CPU 4. Source.

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Last Modified: September 30, 2015 @ 12:00 am