copyright 2009, information builders. slide 1 joel starkman director of operations, focus division...

Copyright 2009, Information Builders. Slide 1

Joel StarkmanDirector of Operations, FOCUS

DivisionInformation Builders, Inc.

October, 2009

FOCUS Support for the zIIP Specialty Engine

What does a term mean? Click on Click it again to remove it.

zIIP support available in FOCUS release 7.6.10

WebFOCUS release 7.7


FOCUS and the zIIP Specialty EngineWhy are we interested in the zIIP?

What is important to mainframe FOCUS and WebFOCUS customers?

Reduce/stabilize cpu charges to IBM for equivalent work

Reduced execution time for batch windows and response time

Functional consistency of the application with prior releases

New features consistent between FOCUS and WebFOCUS

Solid customer service

What is important to mainframe FOCUS and WebFOCUS customers?

Reduce/stabilize cpu charges to IBM for equivalent work

Reduced execution time for batch windows and response time

Functional consistency of the application with prior releases

New features consistent between FOCUS and WebFOCUS

Solid customer service

Our enablement of the zIIP Specialty Engine is critical to addressing this key customer concernOur enablement of the zIIP Specialty Engine is

critical to addressing this key customer concern

Reduce/stabilize cpu charges to IBM




FOCUS and the zIIP Specialty EngineSo why zIIP?

zIIP does not count toward overall MIPS rating of the machine

May avoid/delay Central Processor (CP) or machine upgrade

No IBM charges for eligible workload CPU utilization on zIIP

Improves resource optimization by reducing latent workload demand which the CP can now absorb

May stimulate some visible performance improvement

zIIP does not count toward overall MIPS rating of the machine

May avoid/delay Central Processor (CP) or machine upgrade

No IBM charges for eligible workload CPU utilization on zIIP

Improves resource optimization by reducing latent workload demand which the CP can now absorb

May stimulate some visible performance improvement

“zIIP”: System z Integrated Information Processor


FOCUS and the zIIP Specialty EnginezIIP Reduces FOCUS Usage on Chargeable CPU

Use zIIP No zIIPBenchmark Case zIIP CP CP Offload

FOCUS file w/FOCUS sort 36.94 13.73 38.74 65%

FOCUS file to EXCEL 52.11 7.45 60.89 88%

FOCUS file w/DFSORT 18.14 19.35 27.47 30%

VSAM file w/FOCUS sort 39.57 18.47 59.56 69%

DB2 file w/DB2 sort 49.22 18.03

Flat file w/FOCUS sort 45.26 13.22 47.98 73%

IMS file w/FOCUS sort 0.16 69.19 69.59 1%

Use zIIP No zIIPBenchmark Case zIIP CP CP Offload

FOCUS file w/FOCUS sort 36.94 13.73 38.74 65%

FOCUS file to EXCEL 52.11 7.45 60.89 88%

FOCUS file w/DFSORT 18.14 19.35 27.47 30%

VSAM file w/FOCUS sort 39.57 18.47 59.56 69%

DB2 file w/DB2 sort 49.22 18.03

Flat file w/FOCUS sort 45.26 13.22 47.98 73%

IMS file w/FOCUS sort 0.16 69.19 69.59 1%

Benchmark* of zIIP Processing (cpusec)

Scenario

SUM 4 million records

BY down to 184,341 lines

DEFINEs, COMPUTEs

Scenario

SUM 4 million records

BY down to 184,341 lines

DEFINEs, COMPUTEs

DB2 zIIP usage determined by configuration relative to FOCUS

(FOCUS had 100% of zIIP capacity)

FOCUS zIIP Monitor prevented CP cost overrun due to excessive IMS I/O overhead

Values are in CPU seconds


FOCUS and the zIIP Specialty Engine zIIP Reduces FOCUS Usage on Chargeable CPU

Use zIIP No zIIP Benchmark Case zIIP CP CP Offload

Executive Summary 2.49 0.91 3.91 77% (roll-up, out to PDF)

Operational Report 3.18 1.82 5.08 64% (medium size)

Extract File 5.99 2.93 8.69 66% (show 100% of file)

Exception Report 1.10 0.86 1.75 51% (extract few records)

Use zIIP No zIIP Benchmark Case zIIP CP CP Offload

Executive Summary 2.49 0.91 3.91 77% (roll-up, out to PDF)

Operational Report 3.18 1.82 5.08 64% (medium size)

Extract File 5.99 2.93 8.69 66% (show 100% of file)

Exception Report 1.10 0.86 1.75 51% (extract few records)

Benchmark* of zIIP Processing (cpusec)

Scenario

FOCUS file

1 million records

Scenario

FOCUS file

1 million records(FOCUS had 100% of zIIP capacity)

Values are in CPU seconds


FOCUS and the zIIP Specialty Engine Inside the IBM Mainframe

IBM System z10 Business Class

IBM System z9 BC IBM System z10 EC or IBM System z9 EC

IBM MainframeIBM Mainframe

CP Central Processor

zIIP system z Integrated

Information Processor

A mainframe comprises many chips, some of which are activated zIIP chips are available for z9, z10

mainframes with z/OS 1.8+; DB2V9(IBM has PTFs for z/OS 1.6, 1.7, and DB2 V8)


FOCUS and the zIIP Specialty Engine IBM’s Other Specialty Engines


Linux Java, XML

Other types of chips

I/O

May run at 100% of capacity

Always 100% of capacity

IBM permits 1 zIIP per CP

IBM permits 1 zIIP per CP


FOCUS and the zIIP Specialty Engine Workload Manager


Oper SystemTCP/IP

1000’s Jobs DB2

FOCUSUtilities

No OS No TCP/IPNo Jobs

DB2FOCUS

Some Utilities

zIIP offloads work initiated by the CP

Workload ManagerGuides the dispatching of

work to all processors, based on performance

goals set by the System Administrator



FOCUS and the zIIP Specialty Engine zIIP Allows Central Processor To Do More Work

Work

Central Processor can take on more work

Workload Manager and Dispatcher

Queued workload


FOCUS and the zIIP Specialty Engine Central Processor vs zIIP – Comparison Chart

CP zIIPInitiates processes Yes Never

Executes workloads All types Eligible types

Incurs CPU charges Always Never

Runs at mfg’s 100% clock speed Often/Usually Always

Runs operating system and TCP/IP Yes No

Number of chips permitted by IBMsystem capacity one per CP

Code/enclave runs in: TCB mode SRB mode

Relative cost to buy from IBM $1.00 $0.25

CP zIIPInitiates processes Yes Never

Executes workloads All types Eligible types

Incurs CPU charges Always Never

Runs at mfg’s 100% clock speed Often/Usually Always

Runs operating system and TCP/IP Yes No

Number of chips permitted by IBMsystem capacity one per CP

Code/enclave runs in: TCB mode SRB mode

Relative cost to buy from IBM $1.00 $0.25


FOCUS also captures the amount of work that COULD have gone to the zIIP, had

more zIIP capacity been available

Workload Manager (WLM) controls which workloads get priority access to zIIP

FOCUS and the zIIP Specialty Engine zIIP Access Controlled by Workload Manager

FOCUS enables zIIP at startup after several

verification steps


FOCUS and the zIIP Specialty Engine zIIP-Enabled Mainframe Products Today

DB2

Oracle

Syncsort

CA IDMS

CA Datacom

BMC Software

DataDirect Shadow

Neon Eclipse utilities

CA Netmaster and other CA utilities

DB2

Oracle

Syncsort

CA IDMS

CA Datacom

BMC Software

DataDirect Shadow

Neon Eclipse utilities

CA Netmaster and other CA utilities

Growing list of zIIP-enabled

products

FOCUS will most likely not be the first zIIP-enabled product installed at a site

System Administrators are likely to be aware of zIIP-enabling system requirements at their site

FOCUS will most likely not be the first zIIP-enabled product installed at a site

System Administrators are likely to be aware of zIIP-enabling system requirements at their site

Many mainframe customers already have zIIP processors for other production processing


FOCUS and the zIIP Specialty EnginezIIP Reduces CPU Charges on FOCUS Usage

Significant FOCUS execution occurs on the zIIP

Computations Report formatting

Aggregation Screening criteria

Styling Transaction processing

Significant FOCUS execution occurs on the zIIP

Computations Report formatting

Aggregation Screening criteria

Styling Transaction processing

* Will vary with the needs of the specific task and on local

Workload Manager goal settings

FOCUS customers should experience about a 30-80% cpu cost reduction*




FOCUS Activities that are not yet zIIP’able as of 7.6.10

SU MSO HLI Hiperspace Subsystem


FOCUS and the zIIP Specialty EnginezIIP Reduces CPU Charges on FOCUS Usage

Two types of work must be performed on the CP*

I/O, including database calls and file access FOCUS buffers records where possible to minimize the effect

Calls to 3rd-party software (like Syncsort) or non-IBI subroutines They might actually be enabled and execute on the zIIP

FOCUS will always divert as much as possible to the zIIP.

FOCUS will monitor and adjust for optimum zIIP utilization.

FOCUS will always divert as much as possible to the zIIP.

FOCUS will monitor and adjust for optimum zIIP utilization.

*due to IBM specifications

“Usually better, never worse”


FOCUS and the zIIP Specialty EngineFOCUS Startup and User Control

When SET ZIIP=ON is issued, FOCUS verifies that:• Site’s license says zIIP may be used

• All concatenated libraries are APF-authorized

• zIIP is accessible from this lpar (SRB enclave is built)

All criteria pass?ZIIP is turned ON

Any criteria fails? ZIIP remains OFF; all work will occur on CP

Customer may issue SET ZIIP=OFF Subsequent work occurs on CP only zIIP statistics are still cumulative for the session

When SET ZIIP=ON is issued, FOCUS verifies that:• Site’s license says zIIP may be used

• All concatenated libraries are APF-authorized

• zIIP is accessible from this lpar (SRB enclave is built)

All criteria pass?ZIIP is turned ON

Any criteria fails? ZIIP remains OFF; all work will occur on CP

Customer may issue SET ZIIP=OFF Subsequent work occurs on CP only zIIP statistics are still cumulative for the session

APF-Authorized Library

Many system functions, such as entire supervisor calls (SVC) or special paths through SVCs, are sensitive. Access to these functions must be restricted to authorized programs to avoid compromising the security and integrity of the system.

An APF-authorized Library contains authorized load modules which the Authorized Program Facility (APF) will permit an authorized program to load.


FOCUS and the zIIP Specialty Engine zIIP Statistics in FOCUS

New &variables

&FOCCPU time spent on Central Processor (existing &)

&FOCZIIPCPU time actually spent on zIIP (in SRB mode)

&FOCZIIPONCP time enabled for zIIP but not permitted to run there by Workload Manager / Dispatcher

FOCLOG Retention of zIIP Statistics

FOCLOG expanded to capture zIIP statistics time actually spent on zIIP time enabled for zIIP but not permitted to run there

Captured for entire session and for every commandSite Analyzer also captures zIIP information


FOCUS and the zIIP Specialty Engine Upgrading to 7.6.10 from prior releases

The FOCUS 7.6 product line is:Battle tested by customers for over 3 years Installed at hundreds of sites worldwideThe most thoroughly tested release everAlready 20+% faster due to new IBM-C compiler

The zIIP further enhances that with a shift of workload

Moving up from 7.3? 7.2? 7.1? 7.0.9? 7.0.8R?See our presentations covering 100’s of new features and known product changes so your applications continue to run smoothly

FOCUS and the zIIP Specialty Engine WebFOCUS Console for zIIP Statistics

Copyright 2007, Information Builders. Slide 20Let’s not

Let’s look deeper inside the zIIP engine

FOCUS work that cannot execute on the zIIP: No unauthorized modules (must execute in supervisor state) No I/O interrupts No clock timer interrupts No SVC calls like ENQ/DEQ No message-, print- or recover-operations Limited system services

FOCUS code must flip between TCB and SRB modes Flip to TCB to perform I/O, user routines, system sort, etc.

These may flip to SRB mode by themselves if zIIP-enabled Users may not tune, intervene, nor even be aware of zIIP activity




Let’s look deeper inside the zIIP Specialty Engine








zIIP may be too full right now to access from TCB Island Look at &FOCZIIPONCP

Switching from TCB Mode (CP) to SRB Mode (zIIP)

Pay ‘switch’ toll in both directions Toll may increase or decrease with

frequency of travel Tolls may add up so much that zIIP

Monitor says you might as well stay on TCB Island

Island switching for: Each I/O action Each call to 3rd party software Each call to non-IBI subroutines

Dispatcher / Workload Manager


End-of-Job Statistics (at IBI)Customer may show their own statistics

******************************************************************************* * INFORMATION BUILDERS * STEP TERMINATION STATISTICS * * STEP NAME FOCUS START TIME 15:38:12.25 VIRT SYS USED 320K * PROGRAM NAME FOCUS STOP TIME 15:39:20.77 VIRT CORE USED 124K * DISPATCH PRIORITY 0 ELAPS TIME 00:01:08.52 SWAP COUNT 0 * LPA+CSA PAGE-INS 0 HIPER+DATA SPACE (HI-WATER MARK) 0M * PERFORMANCE GROUP 0 SERV UNITS 319,169 * MAIN STG UNITS 122,822 CPU UNITS 191,474 SRB UNITS 1,212 * ZIIP 00:00:05.93 ZIIP vs CP 00:00:16.44 ZIIP ON CP 00:00:00.00 ******************************************************************************

***************************************************** * * * PAGE INS 0 STEP CPU 00:00:00.86 * PAGE OUTS 0 JOB CPU 00:00:00.86 * NUMBER PAGES 0 SRB TIME 00:00:00.11 * EXP PAGE-OUTS 0 * TRN TIME 00:01:03.30 * I/O UNITS 3,661 COMPLETION CODE R0000 * ZIIP ENCLV 00:00:00.00 IIP DEP ENCLV 00:00:05.93 ******************************************************

******************************************************************************* * INFORMATION BUILDERS * STEP TERMINATION STATISTICS * * STEP NAME FOCUS START TIME 15:38:12.25 VIRT SYS USED 320K * PROGRAM NAME FOCUS STOP TIME 15:39:20.77 VIRT CORE USED 124K * DISPATCH PRIORITY 0 ELAPS TIME 00:01:08.52 SWAP COUNT 0 * LPA+CSA PAGE-INS 0 HIPER+DATA SPACE (HI-WATER MARK) 0M * PERFORMANCE GROUP 0 SERV UNITS 319,169 * MAIN STG UNITS 122,822 CPU UNITS 191,474 SRB UNITS 1,212 * ZIIP 00:00:05.93 ZIIP vs CP 00:00:16.44 ZIIP ON CP 00:00:00.00 *******************************************************************************

Un-normalized (real speed)

No & variable

Normalized to CP speed

&FOCZIIPCPU

zIIP’ed but not run on zIIP

&FOCZIIPONCP

CP cpu includes ZIIP ON CP &FOCCPU

PAGE INS 0 STEP CPU 00:00:00.86 * PAGE OUTS 0 JOB CPU 00:00:00.86 * NUMBER PAGES 0 SRB TIME 00:00:00.11 * EXP PAGE-OUTS 0 * TRN TIME 00:01:03.30 * I/O UNITS 3,661 COMPLETION CODE R0000 * ZIIP ENCLV 00:00:00.00 IIP DEP ENCLV 00:00:05.93 ******************************************************


Installation/Upgrade IssueNew FOCUS License File for 7.6.10+

New for FOCUS 7.6.10 and onward Replaces zapped license string -- but not yet Content is encoded, but character-based for portability Also contains unencoded text of what is licensed FOCUS 7.6.10 ships with default license file

User sees error about obtaining license via email Put license file from email attachment into file named

FLICENSE in ERRORS Do not touch the content. Encoded, highly positional

New for FOCUS 7.6.10 and onward Replaces zapped license string -- but not yet Content is encoded, but character-based for portability Also contains unencoded text of what is licensed FOCUS 7.6.10 ships with default license file

User sees error about obtaining license via email Put license file from email attachment into file named

FLICENSE in ERRORS Do not touch the content. Encoded, highly positional


FOCUS License File

License file identifies: Expiration Date, if any Grace Period, if any

for: Site Each licensed FEATURE (only for ZIIP right now) Each licensed CPU (none right now) Each licensed LPAR (none right now) “ALL OTHERS” that are not explicitly mentioned,

for each of: FEATURE, CPU and LPAR

License file identifies: Expiration Date, if any Grace Period, if any

for: Site Each licensed FEATURE (only for ZIIP right now) Each licensed CPU (none right now) Each licensed LPAR (none right now) “ALL OTHERS” that are not explicitly mentioned,

for each of: FEATURE, CPU and LPAR

FOCUS will enforce these zIIP license contract conditions


FOCUS License File

-* FOCUS license for site 9999.01 created on 07/24/09 at 16.30.32 -*SITECODE 9999.01 LICENSED PERPETUALLY -*UNLICENSED CPUS ALLOWED TO RUN PERPETUALLY -*FEATURE ZIIP LICENSED UNTIL 20091025; GRACE PERIOD UNTIL 20091124 -*OTHER FEATURES LICENSED PERPETUALLY C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040C4E4D4D4E840E3C5E7E3404040404040404040404040404040404040404040404040404040

Sample License File (assume today is 7/24/2009)

Unencoded header record

Unencoded detail records Encoded

detail records

Encoded lines shown here are not actual

encoded strings


License Startup Messages

YOU ARE USING A NON-AUTHORIZED LIBRARY; ZIIP WILL NOT BE USED

CANNOT BUILD ENCLAVE; ZIIP WILL NOT BE USED

(FOC32598) LICENSING FILE CONTAINS INVALID INFORMATION(FOC32589) EXECUTION TERMINATED

(FOC32599) WARNING! YOU ARE USING AN UNLICENSED PRODUCT: FOCUS(FOC32592) EXECUTION REMAINS ENABLED PERPETUALLY

(FOC32588) LICENSE EXPIRATION DATE: 20001231(FOC32590) EXECUTION REMAINS ENABLED UNTIL: 20991231(FOC32591) EXECUTION WAS ENABLED UNTIL: 20081231

(FOC32593) WARNING! YOU ARE USING AN UNLICENSED FEATURE: ZIIP(FOC32595) FEATURE REMAINS ENABLED PERPETUALLY(FOC32579) ZIIP WILL NOT BE ACCESSED. LICENSE FOR ZIIP EXPIRED

YOU ARE USING A NON-AUTHORIZED LIBRARY; ZIIP WILL NOT BE USED

CANNOT BUILD ENCLAVE; ZIIP WILL NOT BE USED

(FOC32598) LICENSING FILE CONTAINS INVALID INFORMATION(FOC32589) EXECUTION TERMINATED

(FOC32599) WARNING! YOU ARE USING AN UNLICENSED PRODUCT: FOCUS(FOC32592) EXECUTION REMAINS ENABLED PERPETUALLY

(FOC32588) LICENSE EXPIRATION DATE: 20001231(FOC32590) EXECUTION REMAINS ENABLED UNTIL: 20991231(FOC32591) EXECUTION WAS ENABLED UNTIL: 20081231

(FOC32593) WARNING! YOU ARE USING AN UNLICENSED FEATURE: ZIIP(FOC32595) FEATURE REMAINS ENABLED PERPETUALLY(FOC32579) ZIIP WILL NOT BE ACCESSED. LICENSE FOR ZIIP EXPIRED


APF Authorization

FOCUS module is shipped APF-authorized (AC flag set to 1) All load libraries invoked on the zIIP must be APF-authorized

STEPLIB concatenation USERLIB - All non-IBI user function libraries must be authorized

On startup, if an unauthorized library is detected, FOCUS starts unauthorized, sets ZIIP=OFF and runs everything on CP Could be done intentionally to force no zIIP

TSO - SysAdmin must make “FOCUS” a TSO-authorized command Limitation - If you execute FOCUS from ISPF option 6, you will not be

able to issue TSO ISPF or IEDIT from within FOCUS Suggestion - Customer could keep an unauthorized copy of FOCLIB,

just in case

FOCUS module is shipped APF-authorized (AC flag set to 1) All load libraries invoked on the zIIP must be APF-authorized

STEPLIB concatenation USERLIB - All non-IBI user function libraries must be authorized

On startup, if an unauthorized library is detected, FOCUS starts unauthorized, sets ZIIP=OFF and runs everything on CP Could be done intentionally to force no zIIP

TSO - SysAdmin must make “FOCUS” a TSO-authorized command Limitation - If you execute FOCUS from ISPF option 6, you will not be

able to issue TSO ISPF or IEDIT from within FOCUS Suggestion - Customer could keep an unauthorized copy of FOCLIB,

just in case


Simulate zIIP usage to estimate need

Don’t have a zIIP at your site?

Put in sys1.parmlib:

PROJECTCPU=YES

Makes FOCUS think zIIP is there Auto-turns on SIMMAXZIIP All zIIP usage goes to

&FOCZIIPONCP

zIIP usage would have been:

&FOCZIIPCPU(0) + &FOCZIIPONCP

Don’t have a zIIP at your site?

Put in sys1.parmlib:

PROJECTCPU=YES

Makes FOCUS think zIIP is there Auto-turns on SIMMAXZIIP All zIIP usage goes to

&FOCZIIPONCP


&FOCZIIPCPU(0) + &FOCZIIPONCP

FOCUS not using enough zIIP?

SET ZIIP=OFF

SET ZIIP=ON/SIMMAXZIIP

Simulates job running as if zIIP had full capacity

Monitor allows zIIP usage to continue longer, even though it is not effective at that moment


&FOCZIIPCPU + &FOCZIIPONCP

FOCUS not using enough zIIP?

SET ZIIP=OFF

SET ZIIP=ON/SIMMAXZIIP

Simulates job running as if zIIP had full capacity

Monitor allows zIIP usage to continue longer, even though it is not effective at that moment


&FOCZIIPCPU + &FOCZIIPONCP


Workload Manager – Quick Concepts

Response time goalsAverage response time goal – Average time in which any job

must complete (skewed by long running jobs)Percentile response time goal – Percent of all work requests

which must complete within a predefined time limit (say 90%) Discretionary Goals – Perform specific workloads only when

resources are available, and preempt in favor of other workloads Velocity Goals – For infrequent and long running workloads,

process when it is ready or just keep it moving toward completion

Response time goalsAverage response time goal – Average time in which any job

must complete (skewed by long running jobs)Percentile response time goal – Percent of all work requests

which must complete within a predefined time limit (say 90%) Discretionary Goals – Perform specific workloads only when

resources are available, and preempt in favor of other workloads Velocity Goals – For infrequent and long running workloads,

process when it is ready or just keep it moving toward completion

WLM makes a contract between the user and the OS to run work across a parallel sysplex in distinct service classes and with defined goals.

WLM samples the system every 250ms to derive a Performance Index (PI) to measure goal achievement.


Workload Manager/Dispatcher – Routes work to zIIP

Execution Velocity Goal

VELOCITY = CPU used / (CPU used + CPU delay) *100 Velocity 100 implies no delay is acceptable; highest priority Velocity <100 implies potentially longer processing time

Declarable choices for zIIP-enabled work:Always wait for zIIP; do not run zIIP-able code on CPTry several times, then give up and run on CP

Execution Velocity Goal

VELOCITY = CPU used / (CPU used + CPU delay) *100 Velocity 100 implies no delay is acceptable; highest priority Velocity <100 implies potentially longer processing time

Declarable choices for zIIP-enabled work:Always wait for zIIP; do not run zIIP-able code on CPTry several times, then give up and run on CP

WLM dispatches work to all processors based on a performance goal algorithm,

tuned by local system administrator


FOCUS and the zIIP Specialty Engine Some zIIP-related Terminology

Velocity The acceptable amount of delay a process can be allow toincur when competing for execution among other tasks

Preemptible Allows the Dispatcher to interrupt a task at any time to run other work at the same or higher dispatching priority; Non-preemptible units (such as local SRBs), once dispatched, continue to run until they complete or incur a voluntary interrupt, like suspend/page fault

TCB Task Control Block - dispatchable unit (DU) runs at dispatching priority of address space; preemptible (non-zIIP)

SRB Service Request Block - dispatchable unit (DU) runs at supervisory priority; not preemptible (zIIP-able)

Enclave Entity that encapsulates the execution units (TCBs and SRBs) which execute programs on behalf of the same work request

Client SRB Created and executed like an ordinary SRB but runs with client (scheduler) dispatching priority and is preemptible

Enclave SRB Created and executed like an ordinary SRB but runs with Enclave dispatching priority and is preemptible

Enclave Service Enable workload manager to create and control enclaves

Velocity The acceptable amount of delay a process can be allow toincur when competing for execution among other tasks

Preemptible Allows the Dispatcher to interrupt a task at any time to run other work at the same or higher dispatching priority; Non-preemptible units (such as local SRBs), once dispatched, continue to run until they complete or incur a voluntary interrupt, like suspend/page fault

TCB Task Control Block - dispatchable unit (DU) runs at dispatching priority of address space; preemptible (non-zIIP)

SRB Service Request Block - dispatchable unit (DU) runs at supervisory priority; not preemptible (zIIP-able)

Enclave Entity that encapsulates the execution units (TCBs and SRBs) which execute programs on behalf of the same work request

Client SRB Created and executed like an ordinary SRB but runs with client (scheduler) dispatching priority and is preemptible

Enclave SRB Created and executed like an ordinary SRB but runs with Enclave dispatching priority and is preemptible

Enclave Service Enable workload manager to create and control enclaves


FOCUS and the zIIP Specialty EngineRecap from Cruising Altitude

A zIIP is almost entirely a cost saving mechanism. CPU usage is not counted toward the maximum observed capacity of an LPAR.

50-80% cost reduction due to zIIP is applicable to both FOCUS and WebFOCUS on the mainframe.

A zIIP chip is identical to a Central Processor chip when shipped from the IBM factory. At installation time, its microcode is changed to restrict its capabilities to those definable as a zIIP.

A zIIP always runs at 100% speed. A Central Processor’s speed may be stepped down for cost saving considerations.

I/O is not performed on the zIIP. No program runs entirely on zIIP; the zIIP absorbs sub-task work from the Central Processors (CP), and only what it is enabled to perform.

FOCUS calls all non-IBI services from CP (system sort, non-FOCUS database products, all customer-written functions) as if they are not zIIP-enabled. They then might execute on the zIIP.

The degree of zIIP usage is largely site dependent. Although a program may be zIIP-enabled, Workload Manager drives the Dispatcher to determine at each execution whether or not to direct any or all of the program to the zIIP, based on settable system performance expectations and on available capacity at that moment.

A zIIP is almost entirely a cost saving mechanism. CPU usage is not counted toward the maximum observed capacity of an LPAR.

50-80% cost reduction due to zIIP is applicable to both FOCUS and WebFOCUS on the mainframe.

A zIIP chip is identical to a Central Processor chip when shipped from the IBM factory. At installation time, its microcode is changed to restrict its capabilities to those definable as a zIIP.

A zIIP always runs at 100% speed. A Central Processor’s speed may be stepped down for cost saving considerations.

I/O is not performed on the zIIP. No program runs entirely on zIIP; the zIIP absorbs sub-task work from the Central Processors (CP), and only what it is enabled to perform.

FOCUS calls all non-IBI services from CP (system sort, non-FOCUS database products, all customer-written functions) as if they are not zIIP-enabled. They then might execute on the zIIP.

The degree of zIIP usage is largely site dependent. Although a program may be zIIP-enabled, Workload Manager drives the Dispatcher to determine at each execution whether or not to direct any or all of the program to the zIIP, based on settable system performance expectations and on available capacity at that moment.


Thank You

FOCUS Support for the zIIP Specialty Engine



copyright 2009, information builders. slide 1 joel starkman director of operations, focus division...

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