L11C8C9ops400.ppt 1

SUBSYSTEMSand

PERFORMANCE

Chapter 8

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SUBSYSTEM CONFIGURATION

QBASE

QSPL

QSYSWRK

QCTL - system console

QINTER

QBATCH

QSPL

QCMN

QSYSWRK

+ + + + +

QBASE QCTLQCTLSBSD

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No restriction on the number of subsystems allowed to run simultaneously.

A SUBSYTEM is an operating environment with its own job queue partitioned from the main system

Running with multiple subsystems providesfor better control and performance of thewhole system the multiple subsystem environmentis activated by changing the system value QCTLSBSD to QCTL

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Two major categories

IBM supplied• QBASE• QCTL• QBATCH• QINTER• QSPL• QCMN• QSYSWRK

USER supplied Application dependent.

• Some supplied by “off the shelf”

Software houses• Other created in house

as needed

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IBM suppliedQBASE - Default subsystem can run all jobs when the system is first

installed - inefficient for later use

QCTL - Starts and ends other subsystems. System console MUST be assigned to it A System is said to be in RESTRICTED STATE when QCTL is the only SBS active. Requirement for RCLSTG function.

QBATCH - arranges and manages batch entries, job priorities and the running of active jobs (max 2 or 3! recommended)

QINTER- has workstation entries allowing interactive jobs to run simultaneously in this subsystem

QSPL - has spooled job queue entries for spooled jobs. E.g. reader and writer jobs

QCMN - communication entries for all communication jobs to run in this subsystem

QSYSWRK - systems functions

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Common USER supplied / created SUBSYSTEMS

Common to seeQPGMR - for programmers environmentQINTER2 - special interactive jobsQBATCH2 - additional batch streamQBATCH3 - additional batch streamsETC. ETC.

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JOB entry types

SubsystemQINTER

Workstation entries

Subsystem ????

Entries 3rd party Supplied

SubsystemQBATCH

Job Queue entries

SubsystemQSPL

Job Queue / spooler entries

SubsystemQCMN

Communication entries

USER SUPPLIEDSubsystem

????? entries

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JOB TYPES

Batch typically a series of programs to be executed consecutivelyBack up , Month end

SBMJOB CMD(CALL PGM(ARPOST) PARM(DB400A01))

Interactive on line real time processing - a dialogue between users and programs

CALL PGM(ARPOST) PARM(DB400A01))

Spooled can be input or output - retrieved or send to queuesWRKSPLF

Communication - started by a request from a remote system to initialize a program and allocate resources

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SUBSYSTEM COMMANDSCHGSYSVAL SYSVAL(QCTLSBSD) VALUE(QCTL)

CRTSBSD CRTSBSD SBSD(ANDRE) POOLS((3 2000 10)) MAXJOBS(3) TEXT('dummy sample')

STRSBS SBSD(QBATCH2)

ENDSBS SBS(QBATCH2) OPTION(*CNTRLD)

DSPSBSD, WRKSBS,

JOB Commands

CALL -- starts a program and optionally pass parameters to it

SBMJOB - submit a job to another subsystem (most common to batch) to be executed in sequential order or by priority

WRKACTJOB - displays the current status of all active jobs currently running in the system (across all subsystems)

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The JOB Description - *JOBD

Contains a set of parameters the value of which defines

how and where a job is to be processed some of these are

*JOBQ which job queue is to be used*OUTQ - where the output is to be directed *JOBPTY - at what priority is this job to run*INLLIBL - What libraries are to be used in the search path

IBM ships the AS/400 with default job descriptions for batch, interactive and spooled jobs

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SYSTEM / STORAGE POOLS

• Defined Max Allocated Pool -Paging Option--

• Pool Size (M) Active Size (M) ID Defined Current • *MACHINE 112.27 +++++ 112.27 1 *FIXED *FIXED

• *BASE 485.85 43 485.85 2 *CALC *CALC

• *INTERACT 415.63 62 415.63 4 *FIXED *FIXED

• *SPOOL 10.23 7 10.23 3 USRDFN USRDFN

• *SHRPOOL1 .00 0 *FIXED

• *SHRPOOL2 .00 0

WRKSHRPOOL

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*MACHINE - hardware dependent - different for each site reserved for operating system usage

*BASE - Main storage can optionally be shared by all *INTERACT - interactive jobs (dedicated) *SPOOL - for spooled jobs (dedicated) *SHRPOOL1 - as designated *SHRPOOL2

QBASE will use *BASE and *INTERACT by defaultQSPL will use *BASE and *SPOOL by default

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SYSTEM POOLS

Have a predefined size and activity level (max jobs)

To much activity in a specific pool leads too trashingand reduced performance

*BASE pool is used for excess memory demand for jobs

where not enough memory is available in the assigned pool.

Subsystem pool numbers are used for routing purposes (primary use / secondary use)

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POOLS

Subsystem description: QBASE Status: INACTIVE

Pool Storage Activity

ID Size (K) Level

1 *BASE

2 *INTERACT

System Pool Reserved Max Pool Size (M) Size (M) Active Pool Subsystem Library 1 106.48 63.57 +++++ *MACHINE 2 510.29 .29 43 *BASE 3 10.23 .00 7 *SPOOL 4 396.98 .00 62 *INTERACT

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Work with Subsystems System: ODIN Type options, press Enter. 4=End subsystem 5=Display subsystem description 8=Work with subsystem jobs Total -----------Subsystem Pools------------ Opt Subsystem Storage (M) 1 2 3 4 5 6 7 8 9 10 __ QDNNOTIFY .00 2 2 __ QINTER .00 2 4 __ QSERVER .00 2 __ QSPL .00 2 3

Cross relationship between pools

SYSTEM POOL referenced

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End Subsystem (ENDSBS) Type choices, press Enter. Subsystem . . . . . . . . . . . QCMN__ Name, *ALL How to end . . . . . . . . . . . *CNTRLD *CNTRLD, *IMMED Delay time, if *CNTRLD . . . . . *NOLIMIT Seconds, *NOLIMIT Additional Parameters End subsystem option . . . . . . *DFT *DFT, *NOJOBLOG, *CHGPTY... + for more values ONLY to be done when no jobs are running in that subsystems

*NOLIMIT allows jobs to finish naturallyShould always end CONTROLLED

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Display System Value System value . . . . . : QPFRADJ Description . . . . . : Performance adjustment Performance adjustment . . . : 2 0=No adjustment 1=Adjustment at IPL 2=Adjustment at IPL and automatic adjustment done by system

3=Automatic adjustment done by system

SYSTEM PERFORMANCEperformance adjustment control

Use HELP on the DSPSYSVAL QPFRADJ screen to get a complete explanation

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Monitoring and adjusting system performance

DASD - stay below 80% - buy

Memory - reallocate pool storage - buy

CPU - exceeds threshold - trashing - buytime slices - max cpu time given per serving

run priorities 1 - 99 highest = 1 lowest = 99

interactive normally @ 20

batch jobs normally @ 50

BALANCE the SYTEM based on DEMAND

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JOB STATES

ACTIVE

uses the processor

occupies storage

within the activity level of the storage pool

WAITING

In wait for I/O activity (some action)

INELIGIBLE

Activity level exceeded (no space/time available to run)

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Monitoring System Status

• WRKSYSSTS• Especially keep an eye on disk usage• When disk usage > 85% serious response

time problems occur• What to do when this happens? Get rid of old

spooled files, joblogs, unused objects, archive older files, etc.

• Compress and reorganize physical files to reclaim delete records space.

• Reclaim storage (combine with an IPL)

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MEASURING system performance Work with System Status ODIN 11/19/00 20:53:30

% CPU used . . . . . . . : 10.0 Auxiliary storage:

Elapsed time . . . . . . : 01:24:31 System ASP . . . . . . : 68.71 G

Jobs in system . . . . . : 17999 % system ASP used . . : 28.2158

% addresses used: Total . . . . . . . . : 68.71 G

Permanent . . . . . . : .007 Current unprotect used : 6088 M

Temporary . . . . . . : .021 Maximum unprotect . . : 6091 M

Type changes (if allowed), press Enter.

System Pool Reserved Max -----DB----- ---Non-DB---

Pool Size (M) Size (M) Active Fault Pages Fault Pages

1 116.09 63.55 +++++ .0 .0 2.5 2.7

2 502.91 .29 43 .5 .7 2.8 7.8

3 10.23 .00 7 .0 .0 .0 .0

4 394.75 .00 62 .1 .4 2.3 5.0

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Work with System Status ODIN 11/29/00 22:05:47 % CPU used . . . . . . . : 7.0 Auxiliary storage: Elapsed time . . . . . . : 00:00:01 System ASP . . . . . . : 68.71 G Jobs in system . . . . . : 19168 % system ASP used . . : 24.2497 % addresses used: Total . . . . . . . . : 68.71 G Permanent . . . . . . : .007 Current unprotect used : 2676 M Temporary . . . . . . : .024 Maximum unprotect . . : 2697 M Type changes (if allowed), press Enter. System Pool Reserved Max -----DB----- ---Non-DB--- Pool Size (M) Size (M) Active Fault Pages Fault Pages 1 113.96 63.50 +++++ .0 .0 .8 .8 2 468.27 6.39 88 .0 .0 .0 .0 3 10.23 .00 8 .0 .0 .0 .0 4 431.51 .00 62 .0 .0 5.3 7.0

Monitoring system performance WRKSYSSTS

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Display System Value System value . . . . . : QMCHPOOL Description . . . . . : Machine storage pool size Pool size in K bytes . . . . : 112048 256-2147483647

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WRKACTJOB

Especially keep an eye on CPU %%%%%%%%

•When CPU usage = ++++ serious response time problems mightoccur based on duration of status

•What to do when this happens? Verify individual usage, make sure no one is in an infinite loop THEN

1st Send a message to heavy users 2nd Change RUN priorities 3rd Put lesser users on HOLD then KILL repeat offenders.

Monitor active users

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Work with Active Jobs WRKACTJOB ODIN 04/03/01 15:39:20CPU %: 16.7 Elapsed time: 00:01:10 Active jobs: 218 Type options, press Enter. 2=Change 3=Hold 4=End 5=Work with 6=Release 7=Display message 8=Work with spooled files 13=Disconnect ... Opt Subsystem/Job User Type CPU % Function Status __ QCMN QSYS SBS .0 DEQW __ QCTL QSYS SBS .0 DEQW __ QSYSSCD QPGMR BCH .0 PGM-QEZSCNEP EVTW __ QINTER QSYS SBS .0 DEQW __ QPADEV000M DB344A16 INT .0 CMD-STRSEU DSPW __ QPADEV001C CE234B14 INT .0 CMD-WRKOBJPDM DSPW __ QPADEV001D DB344B05 INT .1 CMD-STRSEU DSPW__ QPADEV001S DB234F18 INT .0 CMD-STRSEU DSPW __ QPADEV001T ABERNS INT 1.9 CMD-WRKACTJOB RUN __ QPADEV001V DB444B17 INT .0 CMD-STRPDM DSPW More... Parameters or command ===> --------------------------------------------------------------------------------------- F3=Exit F5=Refresh F7=Find F10=Restart statistics F11=Display elapsed data F12=Cancel F23=More options F24=More keys

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WRKDSKSTS

Work with Disk Status ODIN 11/19/00 21:16:47

Elapsed time: 00:00:31

Size % I/O Request Read Write Read Write %

Unit Type (M) Used Rqs Size (K) Rqs Rqs (K) (K) Busy

1 6717 8589 28.2 6.5 6.5 1.8 4.7 6.8 6.4 0

2 6717 7516 28.2 3.9 7.4 1.1 2.8 8.9 6.8 1

3 6717 7516 28.2 4.2 5.7 1.0 3.2 4.0 6.3 3

4 6717 7516 28.2 2.6 7.2 .2 2.4 4.0 7.5 0

5 6717 7516 28.2 3.9 6.3 .7 3.1 4.9 6.7 3

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Powering down the system

• PWRDWNSYS • Make sure to do a SNDBRKMSG to ALL users to notify

them well in advance of the intended shut down!

Power Down System Type choices, press Enter. How to end . . . . . . . . . . . *CNTRLD *CNTRLD, *IMMED Delay time, if *CNTRLD . . . . . 3600 Seconds, *NOLIMIT Restart options: Restart after power down . . . *NO *NO, *YES Restart type . . . . . . . . . *IPLA *IPLA, *SYS, *FULL IPL source . . . . . . . . . . . *PANEL *PANEL, A, B, D Additional Parameters End subsystem option . . . . . . *DFT *DFT, *NOJOBLOG, *CHGPTY... + for more values Timeout option . . . . . . . . . *CONTINUE *CONTINUE, *MSD, *SYSREFCDE

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Operations Navigatorthe GUI Interface

DO LAB ’s A and B from MY web pageON YOUR OWN