OpenTP1 stores service requests from the client to the buffer pool for storing messages. Since this buffer pool is created in the shared memory for a user server, increase of the number of user servers for service processing may tax the system resources.

Specify the scdbufgrp operand in the schedule service definition to share one buffer pool for storing messages by more than one user server. This reduces the amount of shared memory usage. User servers which share one buffer pool for storing messages are called a scheduling buffer group.

Specify the -b option for the scdls command to display the status of the buffer pool for storing messages shared by the scheduling buffer group. The displayed information includes:

• Size of the buffer pool that remains available for storing messages
• Size of the currently used buffer pool for storing messages
• Maximum size of the buffer pool for storing messages
• User server names sharing the buffer pool for storing messages

The above information is displayed for each scheduling buffer group. The following information is displayed for each one of user servers sharing the buffer pool for storing messages:

• User server status
• Number of remaining service requests
• Maximum number of services and remaining service requests
• Size of the buffer pool for storing messages used by the user server
• Maximum size of the buffer pool for storing messages available for the user server

The system goes down if the amount of shared memory specified by the schedule service definition cannot be allocated at startup of OpenTP1. In this case, re-estimate the value of memory.