Customizing UNIX System Services

WebSphere Business Integration Message Broker requires the setup of some UNIX System Services system characteristics. You can use the SETOMVS operator command for dynamic changes or the BPXPRMxx PARMLIB member for permanent changes. Refer to the z/OS UNIX System Services Planning manual for more information.

Do not use the IEFUSI exit to alter the region size of OMVS address spaces.

Set the UNIX System Services characteristics as follows:

Parameter Description Value
MAXCORESIZE The maximum core dump file size (in bytes) that a process can create. Allow an unlimited size. 2 147 483 647
MAXCPUTIME The CPU time (in seconds) that a process is allowed to use. Allow an unlimited CPU time 2 147 483 647
MAXASSIZE The address space region size. Set to the size of the biggest address space. > 1 GB

A minimum of 375 MB is required.

MAXTHREADS MAXTHREADTASKS Specifies the maximum number of threads that a single process can have active. Depends on the definitions of message flows. The value of MAXTHREADS and MAXTHREADTASKS depends on your application. You can calculate the value needed for WebSphere Business Integration Message Broker as follows:
For each message flow:
  1. Multiply the number of input nodes by the number of instances (additional threads +1).
  2. Sum the values of all message flows and add 10 to the resultant sum.

Related tasks
Customizing the z/OS environment

Related reference
Customization tasks and roles (z/OS)