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z/TPF – A Pilot Site Experience

Ana Ribeiro, Manager TPF Systems

Amadeus Operations

17October, TPFUG Orlando 2005

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denContents

Amadeus Scope z/TPF Certification Goals at Amadeus Development Environment Migration Tools Operating System

z/TPF Limits Extended Performance Debugging and Toolkit

Applications Development Problem Statistics Stability of z/TPF Summary IBM Support

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denAmadeus Scope

The volume of messages processed by our TPF-based systems are increasing steadily and the following architectural limits are slowly being reached:

Memory Database

The purpose of the beta program for Amadeus was to:

Determine whether or not z/TPF is achieving the goals intended by it's technology

Amadeus became a beta site for z/TPF on Q4 2004.

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denAmadeus Certification Goals

The goals of this certification were to assess the following: Quality Stability Performance Impact to Applications

All TPF staff to familiarize themselves with: New development environment Migration tools and new build and load process z/TPF concepts and z/Architecture instruction set

Determine the effort to migrate from TPF 4.1 to z/TPF

Support for GO/NOGO decision to implement z/TPF

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Development Environment

LINUX Basic Infrastructure

SuSE Enterprise Server - 8.1 for S/390X (64-bit) Linux Kernel - 2.4.19-3suse-SMP Main Memory - 3.5 GB Two CPs (approximately 853 MIPS) Disk space -58.9 GB GCC/G++ -3.2 tpf-gcc (GCC) - 3.4-tpf-04r2-5 (used for Cross Compilation) Assembler: HLASM R5.0

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denDevelopment Environment (cont)

Infrastructure/Environment Setup

z/VM Administrator (VM Mainframe Issues) Works with Linux Administrator

Linux Administrator (Linux System Issues) Works with Linux TPF Build Administrator

Linux and z/OS TPF Build Administrator (Tool/Build Issues) Works with z/OS Administrator Works with Developers Writes tools

z/OS Administrator (z/OS USS Tool/NFS Issues)

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Solution to deal with LINUX complexity

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denDevelopment Environment (cont)

Amadeus developed tools to reduce build tool complexity and requirement for Linux experience:

AMACONFIG to setup build, load and promotion environment (using .cfg files and $TPF_CFG).

AMAGET to retrieve software for private development. AMAPROMOTE to submit software for implementation. AMACUTOFF to implement software. AMALOAD to create GF, TLD, or OLD (calls IBM’s bldtpf and

loadtpf scripts)

Other complexity: handling of .exp and .cntl files

Amadeus did not use any library system. Just the standard flat file system provide by IBM For full deployment need Library system and SW management

process

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No other Option….

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denDevelopment Environment (cont)

Windows Tools

SMB (Samba) –to make sources available on Windows.

IBM TPF Information Center – for documentation.

PuTTY - to establish a connection to the Linux operating system.

Textpad (4.7.3 – 32 bit edition) – editor (Helios Software Solutions).

IBM TPF Merge Tool - used to merge files from 3 different sources.

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denDevelopment Environment (cont)

Problems

Many compiler problems and environment at first but all resolved On z/OS NFS occasionally returns file “Could not be found” when

file is available on Linux. File time stamp corruption when viewing Linux files in update mode

via SMB.

Comments

IBM Linux TPF Build Environment is good but complex. No tools build around complexity. Up to Customer. Would like to see .exp and .cntl files handling simpler Would like to see current z/OS builds and z/OS software (TPFLDR,

OSTG, etc.) run on Linux to reduce dependencies and complexity

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Tools, which ones?

Rmtrigraphs Rmbackslashes Sspragmas Convert_hdr.sh …. Convert_hdr2upr.sh

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denMigration Tools (cont)

Porting of Assembler code:

No problems with installing assembler programs which do

not need to run in 64 bit mode. Conversion tool works okay for straight assembler programs

which need to be converted to run 64 bit mode. If the 64 bit requirement is localized, it may be possible to

use SAM64/SAM31 instructions round the relevant code and put AMODE on CINFC calls.

Assembler programs which use SPMs are a problem if they need to be converted, because the conversion tool does nothing with the SPMs.

SPM calls will need to be changed manually or the segment re-written to remove the SPM calls.

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denMigration Tools

Porting of Assembler code (cont):

Assembler option FLAG(NOCONT) for programs using the SPM continuation macro # - are not covered in the documentation, but IBM has added ACONTROL statements to all of its programs using the macro;

This would be a big element of work for customers who use

SPMs, so would want to tailor the program or do it via configuration/makefile.

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denMigration Tools (cont)

Porting of ‘C’ code:

When programs look into system data (CP tables) need to look carefully at what the data is and adjust the header files accordingly (especially for pointers).

With single source APARs, loading code to both z/TPF and

TPF 4.1 is quite easy, although you need to create "wrappers" header files to call the equivalent 4.1 C$xxxx/I$xxxx header so you don’t have to change the c_xxxx.h and i_xxxx.h #includes.

IBM provided “header wrappers” for TPF (PJ29593) and for TPFDF (PQ91899)

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denMigration Tools (cont)

Porting of C++ code:

g++ compiler is ‘more’ ANSI compliant than the V1R2 TPF 4.1 current compiler. It is more strict and some manual code cleaning may have to be planned.

Full automation of C++ port is not possible mainly due to: Implementing single source approach cannot be always automated Subtle differences in the Standard Template Library (STL) Order of parameters’ evaluation in function calls

Most runtime problems were related to improper pointer size assumptions

Toolkit proved to be helpful in investigating runtime port issues.

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denz/TPF

The SIPGEN process as well as getting to NORM state has been highly improved.

The Restart processing gives more flexibility to go around certain processes like SNA, TCP/IP, etc. allowing you to achieve different goals without the need of all the components.

The information provided by different displays has more useful information which was obtained by the use of 2 or more entries in TPF 4.1

We would like to see more thorough testing from the Lab , and we suggest the use of large configurations with multiple SSUs.

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denLimits Extended

64-bit addressing supports 10 exabytes of memory Amadeus used VM userids, L/C with 5GB each, and three

different memory configurations (on ECBs, VFA, etc.)

Support more than 16 I-streams The testing was with 16 I-Streams due to Global definitions.

Support more than 3999 DASDs This support was not tested due to hardware limitation.

Support up to x’FFFF ‘ SDAs Testing was done with tape drives, and DASD above

x’7FFF’ SDA range, and including x’FFFF’.

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denPerformance

More physical memory implies less I/O ECB creation time reduced Memory pre-allocated at IPL (e.g.. heap, stack) Memory management overhead reduced Program linkage overhead reduced Tuning ECB heap now possible

CDC – user friendly installation process. Recommended to try out in TPF 4.1

Software Profiler initial testing was performed, and at first glance looks very basic.

We were unable to perform volume testing and performance measurements due to the lack of applications in our test environment.

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denDebugging

More heap usage info collected by Data Collection More information provided in dumps Separate trace tables Dumps include translation – ASCII, EBCDIC, user defined C/C++ function trace includes parameter labels

Toolkit IBM Toolkit Beta release 2.0.9 and 3.0 IBM z/TPF Beta Release PUT01

Good product for applications testing Not suitable for systems or communications diagnostics Product stability better than TPF 4.1 version Support very difficult as much of the product is OCO

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denApplications Development

Development Environment: The change of compiler introduces a lot of changes in the

applications code. Linux/makefile environment is better Makefile and shell script are standard Open implementation provides flexibility for future

development Tools have to be built to hide complexity of control files

The lack of dependency mechanisms such as cross reference complicates the environment for the developer

For C++ this is a must. Is an absolute need to identify to the developer that every object dependant from its class should be rebuilt

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denApplications Development (cont)

Windows Environment: The use of Windows enables the developers the use of

powerful tools built in the workstation X86-64 Linux Intel Server

Installation of the development environment in the Intel server allows developers to speed up the testing phase without dependencies on the network. During the certification this was achieved and the improvement helped to ease the migration of 2 application packages.

Migration Tools With the exception of the Assembler all the tools worked in

the Intel server environment and the assessment from this experience has reduced the time to migrate programs.

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denApplications Development (cont)

Debugging Tools Toolkit V3.0 has been certified and proved to be easy to

install and plug in some of the tools developed in Amadeus.

z/TPF Two applications were migrated, and noticed that changes

made by IBM in the ECB could impact implementation. ECB fields dropped (i.e. CE1RDA, CE2ISOC), used by Amadeus appls.

Integration of Customer records such as the AAA, OPMT, and Globals seen as substantial effort.

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Problem solving methodology

Does the damn thing work?

Don’t mess with it Did you mess with it?

Yes No

Does anyone know? Idiot…

Yes

Hide it

You poor soul

Can you blame somebody else?

NO PROBLEM

No

Yes

No Yes.. IBM

Will you get complaints?

Get rid of it

No

Yes

No

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denStatistics

Amadeus has open more than 150 PMRs for z/TPF in the IBM system, and only 6 remain open, the areas more affected were:

Documentation Development Environment File System System Definition System Restart MDBF related issues

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Stability of z/TPF

PUT00 or GA is very stable but lacks of some functionality

PUT01 Initially seemed instable due to the detection of errors on areas

already stable in PUT00. New APARs were applied and stability became a non-issue Features such as CDC, Software profiler, and large enhancements

on the File System, make this level a very reliable base for z/TPF implementation.

PUT02 Just received. Currently building the system. No tests have yet

been performed

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Summary Development environment

Open and standard, aligned with Amadeus strategy LINUX / tools – complex to handle as delivered. Need customization

for deployment Big infrastructure changes if you have legacy SW repositories, SW

management tools and promotion processes. z/TPF

O/S very stable at PUT01 level Architecture limits lifted and a good set of new functionality provided z/Architecture instruction set – a learning curve

Migration TPF 4.1 to z/TPF Good migration tools. Don ‘t meet 100% customer needs Effort is deemed very high for Applications Reengineering SW development and deployment infrastructure

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IBM Support Through the entire project IBM:

Provided quick response to inquiries. Provided accurate information. Open to new ideas and providing suggestions. Overall excellent customer and technical support.

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Questions

Questions ?

Thank you for your attention