OA17735: SRM SUPPORT OF BLOCKED WORKLOAD

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APAR status

  • Closed as new function.

Error description

  • New Function
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of z/OS 1.7.1 (JBB772S) and       *
    *                  above.                                      *
    ****************************************************************
    * PROBLEM DESCRIPTION: This APAR contains the SRM function for *
    *                      BLOCKED WORKLOAD.                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    This APAR contains the SRM function for BLOCKED WORKLOAD.
    When low priority work obtains a resource that high importance
    work is waiting for but is blocked by a large CPU consumer
    of medium priority. The high priority work is now in effect
    blocked by the medium priority work.
    
    Doc updates for OA17735
    
    +--- Documentation to be updated ------------------------------+
    |                                                              |
    | z/OS 1.7:                                                    |
    |  SA22-7592-12 -- MVS Initialization and Tuning Reference     |
    |                                                              |
    | z/OS 1.8:                                                    |
    |  SA22-7592-13 -- MVS Initialization and Tuning Reference     |
    |                                                              |
    |                                                              |
    +--- Location in Publication ----------------------------------+
    |                                                              |
    | z/OS 1.7:                                                    |
    |  SA22-7592-12 -- MVS Initialization and Tuning Reference     |
    |                                                              |
    | z/OS 1.8:                                                    |
    |   SA22-7592-13 -- MVS Initialization and Tuning Reference    |
    |                                                              |
    |   Chapter 43. IEAOPTxx (OPT parameters)                      |
    |     Statements/parameters for IEAOPTxx                       |
    |       New OPT parameter BLWLINTHD added                      |
    |                                                              |
    +--------------------------------------------------------------|
    | BLWLINTHD                                                    |
    | Specifies the threshold time interval for which a blocked    |
    | address space or enclave must wait before being considered   |
    | for promotion. If the CPU utilization of a system is at 100%,|
    | workloads with low importance (low dispatch priority) might  |
    | not get dispatched anymore. This can lead to problems if the |
    | low priority work holds a resource that is required by high  |
    | priority workloads. Therefore, if an address space or enclave|
    | has ready-to-run work units (TCBs or SRBs) but does not get  |
    | CPU service for the specified time interval because of its   |
    | low dispatch priority, it will be temporarily promoted to a  |
    | higher dispatch priority. Address spaces that are swapped out|
    | are not considered for promotion.                            |
    |                                                              |
    | The syntax is:                                               |
    |                                                              |
    | BLWLINTHD=option                                             |
    |                                                              |
    | Value Range: 5-65535 seconds                                 |
    |                                                              |
    | Default Value: 60 seconds                                    |
    +--------------------------------------------------------------|
    |   Chapter 43. IEAOPTxx (OPT parameters)                      |
    |     Statements/parameters for IEAOPTxx                       |
    |       New OPT parameter BLWLTRPCT added                      |
    |                                                              |
    +--------------------------------------------------------------|
    | BLWLTRPCT                                                    |
    | Specifies how much of the CPU capacity is to be used to      |
    | promote blocked workloads. This parameter does not influence |
    | the amount of CPU service that a single blocked address space|
    | or enclave is given. Instead, this parameter influences how  |
    | many different address spaces or enclaves can be promoted at |
    | the same point in time. If the value specified with this     |
    | parameter is not large enough, blocked workloads might need  |
    | to wait longer than the time interval defined by BLWLINTHD.  |
    |                                                              |
    | The syntax is:                                               |
    |                                                              |
    | BLWLTRPCT=option                                             |
    |                                                              |
    | Value Range:  0-200 (up to 20%. 0% implies that blocked      |
    |                      workloads should not be promoted.)      |
    | Default Value: 0                                             |
    +--------------------------------------------------------------+
    
    
    +--- Documentation to be updated ------------------------------+
    |                                                              |
    | z/OS 1.7:                                                    |
    |   SA22-7630-12 -- z/OS V1R7.0 MVS System Management          |
    |                   Facility (SMF)                             |
    | z/OS 1.8:                                                    |
    |   SA22-7630-14 -- z/OS V1R8.0 MVS System Management          |
    |                   Facility (SMF)                             |
    |                                                              |
    +--- Location in Publication ----------------------------------|
    |                                                              |
    | z/OS 1.7:                                                    |
    |   SA22-7630-12 -- z/OS V1R7.0 MVS System Management          |
    |                   Facility (SMF)                             |
    | z/OS 1.8:                                                    |
    |   SA22-7630-14 -- z/OS V1R8.0 MVS System Management          |
    |                   Facility (SMF)                             |
    |                                                              |
    |                                                              |
    |   Chapter 13. SMF Records                                    |
    |                                                              |
    +--------------------------------------------------------------|
    |                                                              |
    | Subtype 1                                                    |
    | =========                                                    |
    |                                                              |
    | System State Information Section                             |
    | --------------------------------                             |
    |                                                              |
    | Offsets  Name           Length Format  Description           |
    |                                                              |
    |                                                              |
    | 288 120  SMF99_CCTINTHD    2   binary  OPT parameter         |
    |                                        BLWLINTHD for         |
    |                                        starvation threshold  |
    |                                                              |
    | 290 122  SMF99_CCTTRPCT    2   binary  OPT parameter         |
    |                                        BLWLTRPCT for         |
    |                                        percentage of CP      |
    |                                        trickling             |
    |                                                              |
    | 292 124  SMF99_CCTTRATE    4   binary  Maximum number of     |
    |                                        trickles per second   |
    |                                                              |
    | 296 128  SMF99_CCCTTSH     4   binary  Length of major time  |
    |                                        slice, which is also  |
    |                                        the length of trickle |
    |                                                              |
    |                                                              |
    | 300 12C  SMF99_CCTRC100    4   binary  Number of times that  |
    |                                        CP utilization is     |
    |                                        100 % in the current  |
    |                                        interval              |
    |                                                              |
    | 304 130  SMF99_CCTRCDSP    4   binary  Number of times that  |
    |                                        dispatcher was called |
    |                                        to do trickle in the  |
    |                                        current interval      |
    |                                                              |
    | 308 134  SMF99_CCTRCUSE    4   binary  Number of trickles    |
    |                                        used in the current   |
    |                                        interval              |
    |                                                              |
    |                                                              |
    | 312 138  SMF99_CCTRCWTR    4   binary  Number of address     |
    |                                        spaces or enclaves    |
    |                                        waiting longer than   |
    |                                        the threshold         |
    |                                                              |
    | 316 13C  SMF99_CCCITTSH    4   binary  Length of initial     |
    |                                        task time slice       |
    |                                                              |
    +--------------------------------------------------------------|
    |                                                              |
    | Subtype 2                                                    |
    | =========                                                    |
    |                                                              |
    | Period Data Section                                          |
    | -------------------                                          |
    |                                                              |
    | Offsets  Name           Length Format  Description           |
    |                                                              |
    |                                                              |
    | 376 178 SMF99_Time_at_PDP_Using                              |
    |                            4   binary  Time at PDP using     |
    |                                        samples during last   |
    |                                        interval              |
    |                                                              |
    | 380 17C SMF99_Time_at_ PDP 4   binary  Time at PDP           |
    |                                        accumulator during    |
    |                                        last interval         |
    |                                                              |
    +--------------------------------------------------------------|
    |                                                              |
    | Subtype 6                                                    |
    | =========                                                    |
    |                                                              |
    | Period Data Section                                          |
    | -------------------                                          |
    |                                                              |
    | Offsets  Name           Length Format  Description           |
    |                                                              |
    |                                                              |
    | 72   48  SMF996_Time_at_PDP_Using                            |
    |                            4   binary  Time at PDP using     |
    |                                        samples during last   |
    |                                        interval              |
    |                                                              |
    | 76   4C  SMF996_Time_at_ PDP                                 |
    |                            4   binary  Time at PDP           |
    |                                        accumulator during    |
    |                                        last interval         |
    |                                                              |
    +--------------------------------------------------------------+
    

Problem conclusion

Temporary fix

Comments

  • There are approximately 80 modules involved in this BLOCKED
    WORKLOAD function. The major module is IRARMCPM. Some minor
    modules like IEAVNP10,IRAPACAL,IRARMCAP,IRARMOPT,IRARMWL2,
    IRATXGSA and IRAXGS2 are also involved.  Following control
    blocks are affected: IHAOUXB,IRAENCB,IRALCCT,IRAOLST,IRAOUCB,
    IRAOUCBX,IRARMCTY,IRASPTE.
    ž**** PE07/09/25 FIX IN ERROR. SEE APAR OA22614  FOR DESCRIPTION
    ž**** PE07/09/25 FIX IN ERROR. SEE APAR OA22650  FOR DESCRIPTION
    ž**** PE08/02/14 FIX IN ERROR. SEE APAR OA24031  FOR DESCRIPTION
    

APAR Information

  • APAR number

    OA17735

  • Reported component name

    5752 SYS RSRCE

  • Reported component ID

    5752SC1CX

  • Reported release

    730

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2006-08-15

  • Closed date

    2007-09-05

  • Last modified date

    2008-03-11

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    UA36199 UA36200

Modules/Macros

  • IEAVNP10 IEEMB812 IHAOUXB  IRACCT   IRACPSLE
    IRADMN   IRAEVCFG IRAEVENQ IRAEVJAD IRAEVJID IRAEVMCR IRAEVQSC
    IRAEVSSI IRALCCT  IRAMSCSH IRAMXPLR IRAOLST  IRAOPCAN IRAOUCB
    IRAOUCBX IRAPABPD IRAPACAL IRAPADRV IRAPALCA IRAPAMPL IRAPAMP2
    IRAPAPPP IRAPAQU2 IRAPASMF IRAPASM2 IRAPASS1 IRAPASS2 IRAPASS6
    IRAPAS2D IRAPATDD IRAPATOP IRAPATRA IRAPATSE IRARMANL IRARMCAP
    IRARMCBS IRARMCBV IRARMCNS IRARMCPM IRARMCTY IRARMELM IRARMERR
    IRARMER3 IRARMER4 IRARMEVT IRARMFME IRARMFMO IRARMFMT IRARMICS
    IRARMINT IRARMIPM IRARMIPS IRARMOPT IRARMPLB IRARMRM3 IRARMSET
    IRARMSOP IRARMST2 IRARMST3 IRARMSWP IRARMWL1 IRARMWL2 IRARSMSE
    IRASASMF IRASETNP IRASMF99 IRASPTE  IRASR304 IRATXCHP IRATXCH2
    IRATXGSA IRATXGS2 IRAVRENC IRAVRENV IRAWRARC IRAWRART IRAWRCOL
    IRAWRENC IRAWRENT IRAWRNZS IRAWRUPT IRAWRWR4 IRAXNSW  IWMWRCAA
    IWMWRCD  IWMWRPRD IWMW2CRE IWMW2EVR IWMW2IN1 IWMW3BLD IWMZ2WOR
    

Publications Referenced
SA22759212 SA22759213 SA22763012 SA22763014  

Fix information

  • Fixed component name

    5752 SYS RSRCE

  • Fixed component ID

    5752SC1CX

Applicable component levels

  • R72S PSY UA36200

       UP07/09/20 P F709

  • R730 PSY UA36199

       UP07/09/19 P F709

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.



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Document information


More support for:

z/OS family

Software version:

730

Operating system(s):

MVS, z/OS

Reference #:

OA17735

Modified date:

2008-03-11

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