TEST

The IBM defaults for the TEST option differ between LE/VSE 1.1,

 

LE/VSE 1.4 and OS/390 Language Environment. They are:

 

LE/VSE 1.1

NOTEST(NONE,*,NOPROMPT,*)

 

LE/VSE 1.4

NOTEST(ALL,*,NOPROMPT,′′)

OS/390 Language Environment

NOTEST(ALL,*,NOPROMPT,INSPPREF)

You should read the OS/390 Language Environment Programming Reference for information about the TEST option in OS/390 Language Environment.

Note: If you are migrating from LE/VSE 1.1, you should check your use of the TEST option carefully. In LE/VSE 1.1 the TEST option is syntax-checked only, and has no effect on the application. In OS/390 Language Environment this is not the case.

The RPTOPTS and RPTSTG options produce different reports in OS/390 Language Environment to the reports produced in LE/VSE.

RPTOPTS There are more options in OS/390 Language Environment than in LE/VSE. Therefore the options report produced by the RPTOPTS in OS/390 Language Environment will be larger than the corresponding report from LE/VSE.

RPTSTG The report produced by the RPTSTG option in OS/390 Language Environment has more information than the corresponding report produced in LE/VSE. This extra information is due to:

Two more storage-type options in OS/390 Language Environment, NONIPTSTACK and THREADHEAP. The storage reports have information for these options.

OS/390 Language Environment support for multithreading and multiple enclaves (see 17.1.2, ªConceptual Differences between LE/VSE and OS/390 Language Environmentº on page 352). The storage report from OS/390 Language Environment has extra information for these facilities.

17.5.1.1Run-time Options and LE/VSE 1.1

The following options were available in LE/VSE 1.1 to provide compatibility with OS/390 Language Environment. They were syntax-checked and had no effect on the application. They were removed in later releases of LE/VSE but are available in the current release of OS/390 Language Environment. If you used them in your LE/VSE 1.1 applications you should remove them or review their usage carefully. They are:

CBLQDA FLOW INTERRUPT SIMVRD VCTRSAVE

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IBM OS/390 manual Run-time Options and LE/VSE, Cblqda Flow Interrupt Simvrd Vctrsave

OS/390 specifications

IBM OS/390, a versatile operating system, was a cornerstone in enterprise environments and played a pivotal role in mainframe computing. Released in the mid-1990s, OS/390 combined the strengths of IBM's MVS (Multiple Virtual Storage) with new features and enhancements, targeting scalability, reliability, and performance in demanding business applications.

One of the key features of OS/390 was its robust support for multiple users and processes. The system allowed thousands of concurrent users to access applications and data, ensuring high availability and minimizing downtime—a critical requirement for many large organizations. This scalability was supported through various enhancements in memory management and processor scheduling, enabling optimal resource allocation across diverse workloads.

OS/390 was known for its superior workload management capabilities. The Workload Manager (WLM) component allowed administrators to define service policies, specifying how system resources would be allocated according to the priority of tasks. This ensured that critical business processes received the necessary resources while less critical tasks were managed more flexibly.

Another significant characteristic of OS/390 was its commitment to security. The operating system provided comprehensive security features, including user authentication, data encryption, and auditing capabilities. This focus on security was vital for organizations handling sensitive data, ensuring compliance with regulations and safeguarding against unauthorized access.

OS/390 also supported advanced technologies that facilitated integration and development. The system included features like the IBM CICS (Customer Information Control System) for transaction processing and IMS (Information Management System) for database management. These technologies allowed organizations to build robust, high-performance applications tailored to specific business needs.

The ease of network integration was another strength of OS/390. With the advent of the Internet and global connectivity, OS/390 systems could easily interface with various network protocols, enabling businesses to operate in a connected world. This inclusion paved the way for many organizations to expand their capabilities and offer new services, driving digital transformation.

In conclusion, IBM OS/390 represented a significant advancement in mainframe technology, combining scalability, security, and robust workload management. Its rich feature set and support for critical enterprise applications solidified its role as a vital component of many organizations' IT infrastructures, ensuring they could meet their operational challenges head-on while supporting future growth. As technology continues to evolve, the legacy of OS/390 remains influential in the realm of computing.