Library /sys$common/syshlp/pca$help.hlb Time Analysis  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    PCA can analyze your program's resource consumption in the
    time domain. That is, PCA can tell you when your program is
    performing the most I/O, issues system service calls, and so on.
    PCA provides two ways to view time. The first is by millisecond;
    the second is in relationship to the execution of your program
    and involves the use of event markers. See SET EVENT for more
    information on gathering event marker data.

    The PLOT and TABULATE commands accept the following nodespecs to
    analyze your program's behavior in time:

       TIME BY [nn] MSEC
       TIME BY EVENT

    The PLOT and TABULATE commands accepts all datakind qualifiers
    with TIME BY EVENT nodespecs, and the following qualifiers for
    TIME BY [nn] MSEC:

       /PAGE_FAULTS
       /FAULT_ADDRESS
       /SERVICES
       /IO_SERVICE
       /READ_COUNT
       /WRITE_COUNT
       /PHYSICAL_IO_COUNT
       /TASK_SWITCH

    The SET FILTER command accepts the following filter
    specifications to analyze your program's behavior in time:

       TIME = n[:m]
       TIME = event-name