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Status Not under consideration
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Sep 2, 2013

RELATED IDEAS

VFA performance suggestion

Whilst testing an application that issues thousands of FILECs on a specific VFA Immediate file address we saw the ZVFAC USAGE display never showed more than one access.
This is because VFA uses a new buffer if the current one has the write active bit set on i.e. it is still busy with the last FILEC request.
The result is that the application uses 1000s of VFA buffers for just one record and other good VFA candidates are flush prematurely.
Simply adding a YIELDC READY to the FILEC loop was enough to force VFA to use the same buffer for all the FILEC requests.
The suggestion is for VFA to do this automatically, if the VFA buffer has the write active bit set then add the ECB to the bottom of the ready list.

Idea priority Medium
  • Guest
    Reply
    |     Oct 14, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - z Systems Software
    Product - z/TPF

    For recording keeping, the previous attributes were:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - z/TPF

  • Guest
    Reply
    |     Jan 13, 2014

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - z/TPF
    Component - z/TPF

    For recording keeping, the previous attributes were:
    Brand - WebSphere
    Product family - Transaction Processing
    Product - z/TPF
    Component - Runtime

  • Guest
    Reply
    |     Sep 23, 2013

    The submitter requested that this one be deleted.

  • Guest
    Reply
    |     Sep 3, 2013

    Just occurred to me that other ECBs might issue a FIND on this record and should get the most recent version, which will not happen if it is on the Ready list!
    Therefore RFE deleted ...

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