TOCPREVNEXTINDEX

Lund Performance Solutions


SOS CPU Summary

The CPU Summary Screen

The CPU Summary screen reports the general state of one or more CPUs in graphical and tabular formats.
To access the CPU Summary screen from any SOS display screen:
  • Type s from the SOS Enter command: prompt to view the Screen Selection Menu screen.
  • From the Screen Selection Menu screen, enter c (CPU Summary). The CPU Summary screen will display.
  • Type t to toggle between the graphical and tabular displays.
  • Examples of the CPU Summary screen are provided in "Graphical Format" (next page) and "Tabular Format".

    CPU Summary Display Items

    Graphical Format

    The graphical CPU Summary screen contains a horizontal bar graph of the CPU utilization statistics for each CPU on the system. Figure 10.1 shows an example of the screen.




    Figure 10.1 SOS CPU Summary screen (graphical format)

    CPU SUMMARY

    Each CPU SUMMARY data item is described in the next table.
    Table 10.1 SOS CPU SUMMARY (graphical format) data items
    Data Item
    Description
    CPU
    The CPU column contains the sequential identification numbers assigned to the individual CPUs by SOS. If the system uses four processors, the graphical CPU summary would include four lines in the bar graph, and these lines would be numbered 1 through 4 in the CPU column.
    Utilization%
    The Utilization% values provided in the CPU SUMMARY bar graph represent the percentage of CPU time expended during the current measurement interval on various activities.
    The CPU Utilization% data in the CPU Summary screen is reported exactly like the CPU% data in the Global Summary screen. For a description of each possible CPU activity, refer to "CPU%".
    Busy%
    The Busy% value shown on the right portion of the CPU SUMMARY represents the total percentage of time the CPU was busy (not idle) during the current (nnn.n) and elapsed ([nnn]) intervals (if applicable).
    Total
    The Total value represents the average utilization percentage of all CPUs during the current interval.

    Tabular Format

    The tabular CPU Summary screen contains CPU utilization information organized into four categories:
  • Total CPU utilization statistics (CPU SUMMARY).
  • CPU Run queue statistics (RUNQ STATISTICS).
  • Miscellaneous CPU statistics (MISC STATISTICS).
  • CPU utilization statistics for each CPU on the system (PER CPU UTILIZATION).
  • Figure 10.2 shows an example of the CPU Summary screen in tabular format.




    Figure 10.2 SOS CPU Summary screen (tabular format)

    CPU SUMMARY

    The CPU SUMMARY portion of the tabular CPU Summary screen displays the average percentage of CPU time expended on various activities during the current interval. Cumulative averages for the elapsed interval can also be displayed. For instructions, refer to "Display cumulative stats". For a description of each data item, please refer to "CPU Terms" in the Glossary of Terms.
    Table 10.2 SOS CPU Utilization data items
    Data Item
    Description
    User
    The percentage of time the CPU spent executing user code with a nice value of 20 and without any special priority status.
    Real
    The percentage of time executing real-time processes in user mode.
    Nice
    The percentage of time executing processes with a nice value in user mode.
    NNice
    The percentage of time executing processes with a negative nice mode.
    Sys
    The percentage of time the CPU spent in system (kernel) mode.
    Intr
    The percentage of time processing interrupts.
    C SW
    The percentage of time managing context switches.
    Trap
    The percentage of time processing traps.
    Mem
    The percentage of time the CPU spent managing virtual memory.
    Idle
    The percentage of time the CPU was not in use.
    TOTAL BUSY
    The percentage of time the CPU was busy (not idle) during the current (nn.n) and elapsed intervals ([nn]). The TOTAL BUSY value is the sum of the values reported for User, Real, Nice, NNice, Sys, Intr, C SW, Trap, and Mem values.
    HIGH PRI
    The percentage of time the CPU spent executing high priority processes.

    RUNQ STATISTICS

    The RUNQ STATISTICS portion of the tabular CPU Summary screen contains the CPU run queue statistics for the current interval (and the elapsed interval if cumulative statistics are shown). Each data item is described in the following table.
    Table 10.3 SOS RUNQ STATISTICS data items
    Data Item
    Description
    Internal Avg
    The average number of processes in the run queue.
    1/5/15 Min Avg
    The average number of processes in the run queue during the current 1-, 5-, and 15-minute periods, respectively.
    Occ %
    The percentage of time there was one or more processes in the run queue.

    MISC STATISTICS

    The MISC STATISTICS portion of the tabular CPU Summary screen provides some miscellaneous CPU statistics for the current and /or elapsed interval(s). Each data item is described in the next table.
    Table 10.4 SOS MISC STATISTICS data items
    Data Item
    Description
    Forks
    The number of forks per second.
    C Sws
    The number of context switches per second.
    Intrs
    The number of interrupts per second.
    Traps
    The number of traps per second.
    Sys C
    The number of system calls per second.

    PER CPU UTILIZATION

    The PER CPU UTILIZATION portion of the tabular CPU Summary screen displays the same data listed in the CPU SUMMARY portion of the screen for each CPU on the system. Please refer to "CPU SUMMARY" for a description of each data item.

    Lund Performance Solutions
    www.lund.com
    Voice: (541) 812-7600
    Fax: (541) 81207611
    info@lund.com
    TOCPREVNEXTINDEX