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'nmisd_worker_cycle' => 30,
'nmisd_worker_max_cycles' => 5100,

nmisd_worker_cycle is the number of seconds the process will sleep if it doesn't have any job to perform. 

Every time a worker performs a job, a cycle counter is increased. It is possible to change the default behaviour so the worker is killed every N cycles. Another process will be started by the parent once the child process reaches the max cycles, if the number of children processes doesn't reach the max_workers. It will prevent a worker memory get too big. This number can be adjusted, as, if it is too low, there is a cost associated in killing and starting a new process. Can be changed in nmisd_worker_max_cycles. Check