Programming Interface Information: The Monitor Records are intended Programming Interfaces that allow the customer to write programs to obtain services of z/VM.

#### MRSYTCPC

Prolog
Control Block Contents
Cross Reference

#### MRSYTCPC Prolog

####

####

     DSECT NAME - SYTCPC
     FUNCTION - Map a Monitor record.
     LOCATED BY -
            Through the Monitor Control Area
     REFERENCED CONTROL BLOCKS -
            MRRECHDR    Monitor Record Header
     NAME - MRSYTCPC
     DESCRIPTIVE NAME - Monitor Sample Record
                        Domain 0 - System Domain
                        Record 9 - Physical Channel Path Contention Data
     DESCRIPTION - Channel Path Contention data, based entirely
                   on high frequency sampling, shows the number of
                   times that each channel path was busy.
     NOTES:
       - This data is high-frequency sampling data collected by
         issuing the STORE CHANNEL PATH STATUS instruction which
         tests the status (busy or not busy) of all possible channel
         paths. The rate of high-frequency sampling is determined
         (or defaulted) by the MONITOR SAMPLE RATE command.
       - When VM is running in an LPAR in Multiple Image Facility
         mode, physical channel paths may be shared with other
         partitions. This record reflects total usage of the physical
         channel paths by all partitions. Logical channel path
         utilization data for this VM partition is provided in
         MRSYTCPM (domain 0, record 18) or MRSYTEPM (domain 0, record 20)
       - The STORE CHANNEL PATH STATUS instruction is not useful
         for providing channel path utilization data for FICON
         channels. Therefore, if you are looking for information
         on channel path utilization for FICON channels, the
         information is provided in MRSYTCPM (domain 0, record 18)
         or MRSYTEPM (domain 0, record 20).
       - Starting with the z990 processor, the STORE CHANNEL PATH
         STATUS instruction used to create this monitor record
         will no longer return valid information. Please refer
         to MRSYTEPM (domain 0, record 20) for valid channel
         path utilization data.

    MRSYTCPC Control Block Contents

    Offsets
    Dec Hex  Type       Len  Name (Dim)          Description

      0   0  Structure  252  SYTCPC              start of monitor record
      0   0  Character    0  SYTCPC_MRHDR        Record header. See MRRECHDR for
                                                 details.
      0   0  Character   20  MRHDR
      0   0  Unsigned     2  MRHDRLEN            record length in bytes
      2   2  Unsigned     2  MRHDRZER            field of zeros
      4   4  Unsigned     1  MRHDRDM             domain identifier
      5   5  Unsigned     1  *
      6   6  Unsigned     2  MRHDRRC             record identifier
      8   8  Character    8  MRHDRTOD            Time at which this record was
                                                 built. In time-of-day (TOD) clock
                                                 format. See IBM System 370 XA
                                                 Principle of Operation for
                                                 explanation of format.
     16  10  Character    4  *
     20  14  Character    0  MRHDR_END           End of header
     20  14  Character  232  SYTCPC_HFSAMPLE
     20  14  Unsigned     4  SYTCPC_HFCOUNT      Number of samples taken
     24  18  Unsigned     4  SYTCPC_HFCHBUSY(0:25Number of times the
                                                 corresponding channel path was
                                                 busy. Each index number of this
                                                 array corresponds to its channel
                                                 path number, 0 to 255. Example:
                                                 HFCHBUSY(51) = the number of times
                                                 that channel path no. 51 was busy.
    048 418  Unsigned     4  SYTCPC_HFCHSIM(0:50)Number of times the
                                                 corresponding number of channel
                                                 paths were simultaneously busy.
                                                 Each index number from 0 to 49
                                                 corresponds to the total number of
                                                 channel paths that were busy.
                                                 Example: HFCHSIM(23) = the number
                                                 of times that 23 channel paths
                                                 were active at one time. For index
                                                 number 50, this is the number of
                                                 times that 50 or more channel
                                                 paths were simultaneously busy.
    252 4E4  Character    0  SYTCPC_END

    MRSYTCPC Cross Reference

                          Hex           Hex
    Name                 Offset Length Value

    MRHDR                   0     20
    MRHDR_END              14      0
    MRHDRDM                 4      1
    MRHDRLEN                0      2
    MRHDRRC                 6      2
    MRHDRTOD                8      8
    MRHDRZER                2      2
    SYTCPC                  0   1252
    SYTCPC_END            4E4      0
    SYTCPC_HFCHBUSY        18   1024
    SYTCPC_HFCHSIM        418    204
    SYTCPC_HFCOUNT         14      4
    SYTCPC_HFSAMPLE        14   1232
    SYTCPC_MRHDR            0      0

    This information is
    based on z/VM V4R4.0.

    Last updated on 22 Jul 2003 at 15:04:23.

    Copyright IBM Corporation, 1990, 2003