Reduce LUMP storage for OTMA commit-then-send messages enhancement

In IMS 15.5, OTMA is enhanced to reduce the amount of storage that is allocated in LU 6.2 device manager private buffer pools and OTMA for commit-then-send (CM0) I/O PCB output messages.

The storage in LU 6.2 device manager private buffer pools and OTMA is also called LUMP storage.

Previously, 38 KB of LUMP storage was allocated for every CM0 I/O PCB output message, even if the actual size of the message was much smaller. As a result, the amount of LUMP storage that was allocated for the messages was often greater than the amount of storage that was required. With this enhancement, the amount of LUMP storage that is allocated for each output message varies depending on the actual size of the message. Therefore, the amount of unused LUMP storage that is allocated for CM0 I/O PCB output messages is reduced, and more LUMP storage is available for other processes.

Documentation changes

The following table lists the publications that contain new or changed topics for the Reduce LUMP storage for OTMA commit-then-send messages enhancement. Publications that are not impacted by this enhancement are not included in the table.

Table 1. Links to topics that have new or changed content for this enhancement
Publication Links to topics
Release planning