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Theoretical analysis indicates that some optimization problems are NP-complete, or even undecidable. [2] Also, producing perfectly optimal code is not possible since optimizing for one aspect often degrades performance for another. Optimization is a collection of heuristic methods for improving resource usage in typical programs. [3]: 585
A mainframe computer, informally called a mainframe or big iron, [1] is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise resource planning, and large-scale transaction processing.
Open Mainframe Project is a Collaborative Project managed by the Linux Foundation to encourage the use of Linux-based operating systems and open source software on mainframe computers. [1] The project was announced on August 17, 2015, and was driven by IBM, a major supplier of mainframe hardware, as well as 16 other founding members, that ...
In IBM mainframes, Workload Manager (WLM) is a base component of MVS/ESA mainframe operating system, and its successors up to and including z/OS. It controls the access to system resources for the work executing on z/OS based on administrator-defined goals. Workload Manager components also exist for other operating systems.
Traditionally IBM Mainframe memory has been byte-addressable. This kind of memory is termed "Central Storage". IBM Mainframe processors through much of the 1980s and 1990s supported another kind of memory: Expanded Storage. It was first introduced with the IBM 3090 high-end mainframe series in 1985. [28] Expanded Storage is 4KB-page addressable.
Place this template at the bottom of appropriate articles in optimization: {{Optimization algorithms}}For most transcluding articles, you should add the variable designating the most relevant sub-template: The additional variable will display the sub-template's articles (while hiding the articles in the other sub-templates):
RACF (IBM's mainframe security software product) – Sysplex-wide RVARY and SETROPTS commands; PDSE file sharing; Multisystem VLFNOTE, SDUMP, SLIP, DAE; Resource Measurement Facility (RMF) – Sysplex-wide reporting; CICS – uses XCF to provide better performance and response time than using VTAM for transaction routing and function shipping.
In computer programming, profile-guided optimization (PGO, sometimes pronounced as pogo [1]), also known as profile-directed feedback (PDF) [2] or feedback-directed optimization (FDO), [3] is the compiler optimization technique of using prior analyses of software artifacts or behaviors ("profiling") to improve the expected runtime performance of the program.
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