1. Introduction

Initial Observations.

Why Tune?

Response time ‘end-to-end’.

Network Time

Internal Response time

DASD Response time

Non-CICS Component Tuning

Observation

Methodology

Data Capture Tools

Benchmarking Tools

Modelling Tools

CICS Requested/EOD Stats

STAT Transaction

What Resources To Tune

CPU

I/Os

Network I/Os

Serialisation!

2. KE, XM and Dispatcher

TCBs before TS 1.3

TCBs after TS 1.3

SIT Parameters

KE_TASK sizes

Task Attach – Queued

MXT Issues

Task Attach – Success

Ways of starting work

First Dispatch

Region Exit Interval ICV

Dispatcher Chains

Context Switching

QR Subdispatching

IPCS AP=1 / XM=1

STAT XM Output

IPCS DS=1

STAT DS Output

PRTYAGE

3. Storage Management

Address Space Layout

Prefixed Save Area (PSA)

System Queue Area and ESQA

Link Pack Area and ELPA

MVS/ESA Common Service Area

Private and Extended Private Area

(E)LPA & (E)CSA

LSQA

Scheduler Work Area (SWA)

Tuning High Private

CICS Region Below & Above the line

MVS Storage above the CICS Region

MVS Storage within the CICS Region

Storage Fragmentation

Increase The Size Of The DSAs

DSALIM & EDSALIM

Eight possible DSAs

DSAs and SOS

STAT and IPCS Output for SM

4. Storage Protection & TRANISO

Storage Violations

Storage Keys

Transaction Isolation

Performance Cost

“Huge Regions I’ll never wangle that!”

Subspace Stats.

5. LE/370

CEEROPT/CEECOPT

AUTODST

RUWAPOOL

CLER Txn.

6. CICS/VSAM

CEDA Def File (4)

CEDA Def Lsrpool (3)

Hiperspace Exploitation

Locking Non-RLS VSAM

CICS/TS Update 2.2 Onward

Locking RLS VSAM

Non-RLS Deadly Embrace – CI

Non-RLS Deadly Embrace – Record

Avoiding Non-RLS Deadlocks

RLS Deadlocks

Bad News VSAM Stuff!

Premature CA Splits

Lsrpool and File Stats.

7. CICS Data Tables

CFDTs

Shared Data Tables

8. Terminal Control

Round Trip Time

High Performance Option (HPO)

RAPOOL

RAMAX

EOD VTAM Stats

SNA Chaining

SENDSIZE/RECEIVESIZE

Sample VIO Trace

IOAREALEN

MSGINTEG

Autoinstall

Data Compression

Statistics

ICVTSD

Checklist

9. Intercommunication

Define Connection (2)

QUEUELIMIT

MAXQTIME

DEFine Sessions

Session Usage

Session Terminal Stats

System Entry Stats.

Workload Balancing (DFHDYP)

VTAM Generic Resource

MROLRM

MROBTCH

10. CWS, SSL and TCPIP

CWS and MXT

3270 Bridge

CEDA Def TCPIPSERVICE

SOCKETCLOSE

Backlog

SSLDELAY

SSLTCBs

Summary

Statistics

11. Trace

Tracing at Level 1

CETR discussion

12. Recovery Restart & Logger

Global Catalog Buffers

What is a Logstream

UOW Chaining & Logger I/O

Activity Keypoints & Log Trimming

Logger Stats.

13. Loader & Program Manager

LLA and VLF

DEF PROGram

SOS!

Dynamic Program Storage Compression

Threadsafe Discussion

LD & PG Stats

14. Temporary Storage

Tsmodels

Main vs Aux

Buffering and I/Os

TS Affinity

Solution 1

Solution 2

TS Stats

15. Transient Data

Types of TDQ

Intra TD Buffers

Extrapartition

Intrapartition

Recovery

TD Stats

16. CICS-DB2 Interface

Address Space level Dispatching

Thread Level Dispatching

Pre and Post CICS/TS 2.2 TCBs

CEDA Def DB2CONN, DB2ENTRY & DB2TRAN

Accounting

Statistics

17. JAVA in CICS/TS

JVM Pools

JVM Heap Storage

Continuous & worker JVMs

18. Selected SIT parms.

SIT parms that explicitly affect performance – full SIT in Appendix A.

Appendix A.

Complete list of SIT parms.