Usage information is sampled by PIM every 30 seconds and collected by sbatchd at a maximum frequency of every SBD_SLEEP_TIME (configured in the lsb.params file) and sent to mbatchd.
An update occurs only if the value for the CPU time, resident memory usage, or virtual memory usage has changed by more than 10 percent from the previous update, or if a new process or process group has been created. Even if the usage does not change for more than 10%, SBD will still update it if 15 * SBD_SLEEP_TIME passed from last update.