демон сборщика показателей производительности (performance metrics collector daemon)
Предостережение (Caveat)
pmcd does not explicitly terminate its children (agents), it only
closes their pipes. If an agent never checks for a closed pipe
it may not terminate.
The configuration file parser will only read lines of less than
1200 characters. This is intended to prevent accidents with
binary files.
The timeouts controlled by the -t option apply to IPC between
pmcd and the PMDAs it spawns. This is independent of settings of
the environment variables PMCD_CONNECT_TIMEOUT and
PMCD_REQUEST_TIMEOUT (see PCPIntro(1)) which may be used
respectively to control timeouts for client applications trying
to connect to pmcd and trying to receive information from pmcd.
