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Status Not under consideration
Workspace CICS Transaction Server for z/OS
Categories Runtime
Created by Guest
Created on Oct 21, 2013

RELATED IDEAS

CICS: Fragmentación de la memoria

La memoria de CICS se fragmenta y no existe ninguna forma de solucionar ese problema. Esta situación, impide utilizar áreas de, por ejemplo, 20 MB a transacciones de aplicación, algo que imposibilita la correcta ejecución de las transacciones, haciendo que se cancelen.
Se solicita que el CICS sea capaz de gestionar la fragmentación de su propia memoria o existan comandos de sistemas que puedan invocarse para solucionar esta situación imprevista, sin tener que reiniciar el CICS.
La "solución" aportada por el CAS de IBM, es parar y reiniciar el CICS, con lo que ello supone de interrupción del servicio.
Esta petición, que para Banco Popular es una incidencia, IBM la cataloga como mejora, y por eso, se solicita desde aquí, porque el PMR se va a cerrar (si no se ha cerrado ya); siendo algo que en lo que estamos en completo desacuerdo.

Idea priority High
  • Guest
    Reply
    |     Oct 5, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - Transaction Processing
    Product - CICS Transaction Server

    For recording keeping, the previous attributes were:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - CICS Transaction Server

  • Guest
    Reply
    |     Sep 9, 2014

    We have no plans to make enhancements in this area.

    CICS applications requiring large amounts of virtual storage should always be implemented with care and a view on the potential impact of such requests on the overall performance and management of the CICS dynamic storage areas and the available storage. Over time, frequent use of such large storage requests will always lead to an increase in the possibility for storage fragmentation to occur resulting in being unable to satisfy these requests within a fixed storage area such as that defined by a CICS dynamic storage area resulting in application failures or even CICS region failures. Using the CICS storage manager statistics data one can potentially get an early warning that storage fragmentation is occurring so that restarting the CICS region can be scheduled to minimise any interruption of the production service.

    The impact of storage fragmentation is a particularly difficult issue to resolve with traditional programming languages that directly reference storage addresses that do not lend themselves to the use of more modern garbage collection style storage management techniques that programming languages such as Java (which can be used in CICS TS) benefit from.

    Over time with the advent of improved support for 64-bit storage use by CICS TS (initial 64-bit support for non-LE Assembler applications was introduced in CICS TS V5.1) the impact of such large storage requests on fragmentation will be reduced somewhat, but even in that environment such large storage requests should always be considered carefully for their overall performance impact on the CICS region.

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