RedHat Enterprise Linux 7 ( RHEL7 ) で /var/log/messages に以下のようなログが出力されていた。

Dec 20 00:01:01 server01 systemd: Started Session 1204 of user root. Dec 20 00:01:01 server01 systemd: Starting Session 1204 of user root. Dec 20 00:08:01 server01 systemd: Created slice User Slice of pcp. Dec 20 00:08:01 server01 systemd: Starting User Slice of pcp. Dec 20 00:08:01 server01 systemd: Started Session 1205 of user pcp. Dec 20 00:08:01 server01 systemd: Starting Session 1205 of user pcp. Dec 20 00:08:01 server01 systemd: Removed slice User Slice of pcp. Dec 20 00:08:01 server01 systemd: Stopping User Slice of pcp. Dec 20 00:10:01 server01 systemd: Created slice User Slice of pcp. Dec 20 00:10:01 server01 systemd: Starting User Slice of pcp. Dec 20 00:10:01 server01 systemd: Started Session 1207 of user pcp. Dec 20 00:10:02 server01 systemd: Starting Session 1207 of user pcp. Dec 20 00:10:02 server01 systemd: Started Session 1206 of user root. Dec 20 00:10:02 server01 systemd: Starting Session 1206 of user root. Dec 20 00:10:02 server01 systemd: Removed slice User Slice of pcp. Dec 20 00:10:02 server01 systemd: Stopping User Slice of pcp. Dec 20 00:20:01 server01 systemd: Started Session 1208 of user root. Dec 20 00:20:01 server01 systemd: Starting Session 1208 of user root. Dec 20 00:25:01 server01 systemd: Created slice User Slice of pcp. Dec 20 00:25:01 server01 systemd: Starting User Slice of pcp. Dec 20 00:25:01 server01 systemd: Started Session 1209 of user pcp. Dec 20 00:25:01 server01 systemd: Removed slice User Slice of pcp. Dec 20 00:25:01 server01 systemd: Stopping User Slice of pcp. Dec 20 00:28:01 server01 systemd: Created slice User Slice of pcp. Dec 20 00:28:01 server01 systemd: Starting User Slice of pcp. Dec 20 00:28:01 server01 systemd: Started Session 1210 of user pcp. Dec 20 00:28:01 server01 systemd: Starting Session 1210 of user pcp. Dec 20 00:28:01 server01 systemd: Removed slice User Slice of pcp. Dec 20 00:28:01 server01 systemd: Stopping User Slice of pcp.

どうやら、以下の２つの cron ジョブによって PCP (Performance Co-Pilot) 関連の
プロセスが動いているようだ。

# cat /etc/cron.d/pcp-pmie # # Performance Co-Pilot crontab entries for a monitored site # with one or more pmie instances running # # daily processing of pmie logs (with compression enabled) 08     0  *  *  *  pcp  /usr/libexec/pcp/bin/pmie_daily -X xz -x 3 # every 30 minutes, check pmie instances are running 28,58  *  *  *  *  pcp  /usr/libexec/pcp/bin/pmie_check -C

# cat /etc/cron.d/pcp-pmlogger # # Performance Co-Pilot crontab entries for a monitored site # with one or more pmie instances running # # daily processing of archive logs (with compression enabled) 10     0  *  *  *  pcp  /usr/libexec/pcp/bin/pmlogger_daily -X xz -x 3 # every 30 minutes, check pmlogger instances are running 25,55  *  *  *  *  pcp  /usr/libexec/pcp/bin/pmlogger_check -C

PCP がインストールされたタイミングでこの２つの cron ジョブは自動的に登録される。

/etc/cron.d/pcp-pmie と /etc/cron.d/pcp-pmlogger のファイルを削除することで、
定期的なプロセスの稼働を停止し、ログの出力も停止できる。