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

#### MRSYTSCG

Prolog
Control Block Contents
Cross Reference

#### MRSYTSCG Prolog

####

####

     DSECT NAME - SYTSCG
     FUNCTION - Map a Monitor record.
     LOCATED BY -
            Through the Monitor Control Area
     REFERENCED CONTROL BLOCKS -
            MRRECHDR    Monitor Record Header
     NAME - MRSYTSCG
     DESCRIPTIVE NAME - Monitor Sample Record
                        Domain 0  - System Domain
                        Record 10 - Scheduler Activity (global)
     DESCRIPTION - Provides information concerning scheduling
                   of work in the system to aid an installation
                   in the use of tuning commands. This information
                   should be used with record MRSYTSCP (Domain 0,
                   Record 13) for a complete picture of scheduling
                   in the system.

    MRSYTSCG Control Block Contents

    Offsets
    Dec Hex  Type       Len  Name (Dim)             Description

      0   0  Structure  140  SYTSCG                 start of monitor record
      0   0  Character    0  SYTSCG_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  Unsigned     2  SYTSCG_SRMCDISP        Cardinal count of users in
                                                    the dispatch list.
     22  16  Unsigned     2  SYTSCG_SRMCDLDG        Cardinal count of all
                                                    'loading' users in the dispatch
                                                    list.
     24  18  Unsigned     2  SYTSCG_SRMC1DSP        Cardinal count of short,
                                                    medium, and long running users
                                                    in the dispatch list.
     26  1A  Unsigned     2  SYTSCG_SRMC2DSP        Cardinal count of medium and
                                                    long running users in the
                                                    dispatch list. This includes
                                                    all Q2 and Q3 users, but does
                                                    not include Q1 or Q0 users.
     28  1C  Unsigned     2  SYTSCG_SRMC3DSP        Cardinal count of long
                                                    running users in the dispatch
                                                    list. This includes all Q3
                                                    users. It does not include Q0,
                                                    Q1, or Q2 users.
     30  1E  Unsigned     2  SYTSCG_SRMC1ELG        Cardinal count of short,
                                                    medium, and long running users
                                                    in the eligible list. This
                                                    includes all E1, E2, and E3
                                                    users. It includes no E0 users.
     32  20  Unsigned     2  SYTSCG_SRMC2ELG        Cardinal count of medium and
                                                    long running users in the
                                                    eligible list. This includes
                                                    all E2 and E3 users. It
                                                    includes no E0 or E1 users.
     34  22  Unsigned     2  SYTSCG_SRMC3ELG        Cardinal count of
                                                    long-running users in the
                                                    eligible list. This includes
                                                    all E3 users. It includes no
                                                    E0, E1, or E2 users.
     36  24  Unsigned     2  SYTSCG_SRMC1DLD        Cardinal count of all
                                                    'loading users' in Q1, Q2, and
                                                    Q3.
     38  26  Unsigned     2  SYTSCG_SRMC2DLD        Cardinal count of all
                                                    'loading users' in Q2 and Q3.
     40  28  Unsigned     2  SYTSCG_SRMC3DLD        Cardinal count of all
                                                    'loading users' in Q3.
     42  2A  Unsigned     2  SYTSCG_SRMC1ELD        Cardinal count of all
                                                    'loading users' in E1, E2, and
                                                    E3.
     44  2C  Unsigned     2  SYTSCG_SRMC2ELD        Cardinal count of all
                                                    'loading users' in E2 and E3.
     46  2E  Unsigned     2  SYTSCG_SRMC3ELD        Cardinal count of all
                                                    'loading users' in E3.
     48  30  Character    8  SYTSCG_SRME1ETS        Amount of time, in TOD clock
                                                    units, of a Q1 user's elapsed
                                                    time slice. The elapsed time
                                                    slice is the wall clock time
                                                    this user will be allowed to
                                                    remain in the dispatch list at
                                                    one time. This time will change
                                                    as the load on the system
                                                    changes.
     56  38  Unsigned     2  SYTSCG_SRME2ETF        The elapsed time slice factor
                                                    for Q2. To obtain the elapsed
                                                    time slice for a Q2 user,
                                                    multiply this value by the Q1
                                                    elapsed time slice. This time
                                                    will change as the load on the
                                                    system changes.
     58  3A  Unsigned     2  SYTSCG_SRME3ETF        The elapsed time slice factor
                                                    for Q3. To obtain the elapsed
                                                    time slice for a Q3 user,
                                                    multiply this value by the Q1
                                                    elapsed time slice. This time
                                                    will change as the load on the
                                                    system changes.
     60  3C  Signed       4  SYTSCG_SRMABSDL        Cardinal count of total
                                                    absolute shares of all VMDBKs
                                                    in the dispatch list. Unit of
                                                    value is a hexadecimal factor
                                                    scaled 16 bits. For example,
                                                    X'00010000' = 1.00(100%),
                                                    X'0000C000' = 0.75(75%),
                                                    X'00008000' = 0.50(50%), etc.
                                                    Set to zero if user is a
                                                    RELATIVE share user.
     64  40  Signed       4  SYTSCG_SRMRELDL        Cardinal count of total
                                                    relative shares of all VMDBKs
                                                    in the dispatch list.
     68  44  Unsigned     4  SYTSCG_SRMTOTST        Total storage to consider
                                                    when selecting VMDBKs for the
                                                    dispatch list.
     72  48  Unsigned     4  SYTSCG_SRMWSSDL        Sum of Working Set Sizes for
                                                    all users (Q0...Q3) currently
                                                    in the dispatch list.
     76  4C  Unsigned     4  SYTSCG_SRMWSSD1        Sum of WSS's for all Q1, Q2,
                                                    and Q3 users currently in the
                                                    dispatch list.
     80  50  Unsigned     4  SYTSCG_SRMWSSD2        Sum of WSS's for all Q2 and
                                                    Q3 users currently in the
                                                    dispatch list.
     84  54  Unsigned     4  SYTSCG_SRMWSSD3        Sum of WSS's for all Q3 users
                                                    currently in the dispatch list.
     88  58  Unsigned     4  SYTSCG_SRMLLCNT        Count of adds to the
                                                    limit-list. This count does not
                                                    include adds resulting from
                                                    virtual-MP priority drop.
     92  5C  Unsigned     4  SYTSCG_SRMCONLL        Count of users actually ON
                                                    the Limit List.
     96  60  Character    8  SYTSCG_SRMATOD         Artificial TOD. This TOD only
                                                    advances at the rate the system
                                                    is running user work.
    104  68  Character    8  SYTSCG_SRMATOD2        Artificial TOD2. This TOD
                                                    only advances with each CPU's
                                                    user time and each CPU's wait
                                                    time.
    112  70  Unsigned     4  SYTSCG_SRMWTCPU        Mask of CPUs in wait state.
    116  74  Unsigned     4  SYTSCG_CALSLKCT        Count of formal spin requests
                                                    for the scheduler lock. This
                                                    field is part of the SRMSLOCK
                                                    synchronization lock control
                                                    block (SYNCOUNT).
    120  78  Character    8  SYTSCG_CALSLKTM        Elapsed spin time on the
                                                    scheduler lock starting at zero
                                                    and counting up when formally
                                                    spinning on lock. Value is in
                                                    TOD units. This field is part
                                                    of the SRMSLOCK synchronization
                                                    lock control block (SYNTIME).
    128  80  Unsigned     4  SYTSCG_CALTLKCT        Count of formal spin requests
                                                    for the TRQBK queue lock. This
                                                    field is part of the HCPTRQLK
                                                    synchronization lock control
                                                    block (SYNCOUNT). In z/VM 4.3.0
                                                    and earlier the serialization
                                                    for this function was done
                                                    using the scheduler lock so the
                                                    count in this field would have
                                                    been included in the scheduler
                                                    lock field called
                                                    SYTSCG_CALSLKCT.
    132  84  Character    8  SYTSCG_CALTLKTM        Elapsed spin time on the
                                                    TRQBK queue lock starting at
                                                    zero and counting up when
                                                    formally spinning on lock.
                                                    Value is in TOD units. This
                                                    field is part of the HCPTRQLK
                                                    synchronization lock control
                                                    block (SYNTIME). In z/VM 4.3.0
                                                    and earlier the serialization
                                                    for this function was done
                                                    using the scheduler lock so the
                                                    spin time in this field would
                                                    have been included in the
                                                    scheduler lock field called
                                                    SYTSCG_CALSLKTM.
    140  8C  Character    0  SYTSCG_END

    MRSYTSCG 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
    SYTSCG                     0    140
    SYTSCG_CALSLKCT           74      4
    SYTSCG_CALSLKTM           78      8
    SYTSCG_CALTLKCT           80      4
    SYTSCG_CALTLKTM           84      8
    SYTSCG_END                8C      0
    SYTSCG_MRHDR               0      0
    SYTSCG_SRMABSDL           3C      4
    SYTSCG_SRMATOD            60      8
    SYTSCG_SRMATOD2           68      8
    SYTSCG_SRMCDISP           14      2
    SYTSCG_SRMCDLDG           16      2
    SYTSCG_SRMCONLL           5C      4
    SYTSCG_SRMC1DLD           24      2
    SYTSCG_SRMC1DSP           18      2
    SYTSCG_SRMC1ELD           2A      2
    SYTSCG_SRMC1ELG           1E      2
    SYTSCG_SRMC2DLD           26      2
    SYTSCG_SRMC2DSP           1A      2
    SYTSCG_SRMC2ELD           2C      2
    SYTSCG_SRMC2ELG           20      2
    SYTSCG_SRMC3DLD           28      2
    SYTSCG_SRMC3DSP           1C      2
    SYTSCG_SRMC3ELD           2E      2
    SYTSCG_SRMC3ELG           22      2
    SYTSCG_SRME1ETS           30      8
    SYTSCG_SRME2ETF           38      2
    SYTSCG_SRME3ETF           3A      2
    SYTSCG_SRMLLCNT           58      4
    SYTSCG_SRMRELDL           40      4
    SYTSCG_SRMTOTST           44      4
    SYTSCG_SRMWSSDL           48      4
    SYTSCG_SRMWSSD1           4C      4
    SYTSCG_SRMWSSD2           50      4
    SYTSCG_SRMWSSD3           54      4
    SYTSCG_SRMWTCPU           70      4

    This information is
    based on z/VM V5R2.0.

    Last updated on 11 Dec 2005 at 18:48:12.

    Copyright IBM Corporation, 1990, 2005