Memory configurations

Memory management is the allocation of core resources such as IOBs, SWBs, XWBs, frames, and 1 MB frames.

Memory allocations are defined in keypoint A. As many as eight memory configurations are available to be used. When you IPL the z/TPF system, CTIN matches a memory configuration to a physical processor by best fit; that is, it uses the memory configuration that requires the most amount of storage after meeting the requirements of a minimum amount of both VFA and the 31-bit system heap. You can use the ZCTKA PREFER command to specify a specific memory configuration as preferred so that CTIN will try to use this configuration first.

Use the following commands to manage memory configurations:
  • ZCTKA ALTER: To change storage allocation values for the memory configuration.
  • ZCTKA COPY: To copy a memory configuration.
  • ZCTKA DEFINE: To add a memory configuration.
  • ZCTKA DELETE: To delete a memory configuration and all of its definitions.
  • ZCTKA DISPLAY: To display storage allocation values, including block allocations for the in-use memory configuration, the names of the defined memory configurations, and the preferred memory configuration.
  • ZCTKA PREFER: To designate a memory configuration to be used for the next z/TPF system IPL.