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Understand output of `ps u` command
USER = Effective user name
PID = Process ID
%CPU = CPU utilization
%MEM = Ratio of the process's resident set size to the physical memory
VSZ = Virtual memory size of the process in KiB (1024-byte units). Device mappings are currently excluded; this is subject to change.
RSS = Resident set size, the non-swapped physical memory that a task has used (in kiloBytes).
TTY = Controlling terminal
STAT = Process state
START = Process start time
TIME = Accumulated CPU time
COMMAND = Command name

PROCESS STATE CODES
       Here are the different values that the s, stat and state output specifiers
       (header "STAT" or "S") will display to describe the state of a process.
       D    Uninterruptible sleep (usually IO)
       R    Running or runnable (on run queue)
       S    Interruptible sleep (waiting for an event to complete)
       T    Stopped, either by a job control signal or because it is being traced.
       W    paging (not valid since the 2.6.xx kernel)
       X    dead (should never be seen)
       Z    Defunct ("zombie") process, terminated but not reaped by its parent.

       For BSD formats and when the stat keyword is used, additional characters may be displayed:
       <    high-priority (not nice to other users)
       N    low-priority (nice to other users)
       L    has pages locked into memory (for real-time and custom IO)
       s    is a session leader
       l    is multi-threaded (using CLONE_THREAD, like NPTL pthreads do)
       +    is in the foreground process group