CHUNK_JOB_SIZE in an application profile ensures that jobs associated with the application are chunked together. CHUNK_JOB_SIZE=1 disables job chunk scheduling. Application-level job chunk definition overrides chunk job dispatch configured in the queue.
CHUNK_JOB_SIZE is ignored and jobs are not chunked under the following conditions:
CPU limit greater than 30 minutes (CPULIMIT parameter in lsb.queues or lsb.applications)
Run limit greater than 30 minutes (RUNLIMIT parameter in lsb.queues or lsb.applications)
Run time estimate greater than 30 minutes (RUNTIME parameter in lsb.applications)
If CHUNK_JOB_DURATION is set in lsb.params, chunk jobs are accepted regardless of the value of CPULIMIT, RUNLIMIT or RUNTIME.