Worker is a service over event loop that tracks and schedules outstanding queries, you can see the statistics or schedule new queries. It also contains information about specified worker count and process rank.
Current worker process PID (number).
Return table of statistics. See member descriptions in
worker_stats. A few fields are added, mainly from POSIX
systime– CPU time used, in seconds
pagefaults– the number of hard page faults, i.e. those that required I/O activity
swaps– the number of times the process was “swapped” out of main memory; unused on Linux
csw– the number of context switches, both voluntary and involuntary
rss– current memory usage in bytes, including whole cache (resident set size)