rpc.rstatd, rstatd —
kernel statistics server
  
    | /usr/libexec/rpc.rstatd | [interval] | 
rpc.rstatd is a server which returns performance
  statistics obtained from the kernel. These statistics are read using the
  rup(1) command. The
  rpc.rstatd daemon is normally invoked by
  inetd(8).
The interval argument specifies the number
    of seconds that rpc.rstatd should stay active,
    updating its internal statistics every second. If no value is specified, 20
    seconds will be used. After interval seconds with no
    new RPC requests, if rpc.rstatd was invoked from
    inetd(8),
    rpc.rstatd exits. Otherwise,
    rpc.rstatd loops, becoming dormant until it receives
    a new RPC request, and staying active until interval
    seconds pass with no new requests.
rpc.rstatd uses an RPC protocol defined in
    /usr/include/rpcsvc/rstat.x.