Plesk sw-engine process causes high CPU usage

Symptoms

Plesk sw-engine process causes high CPU usage:

# ps aux | grep sw-engine
root 1242 0.0 0.3 348136 28732 ? Ss Jan14 0:14 /usr/bin/sw-engine -c /usr/local/psa/admin/conf/php.ini /usr/local/psa/admin/bin/modules/watchdog/wdcollect -c /usr/local/psa/etc/modules/watchdog/wdcollect.inc.php
root 2315 0.0 0.1 353260 9908 ? Ss Jan14 0:00 sw-engine-fpm: master process (/etc/sw-engine/sw-engine-fpm.conf)
root 3136 0.0 0.3 363840 32028 ? S Jan14 1:00 /usr/bin/sw-engine -c /usr/local/psa/admin/conf/php.ini /usr/lib64/plesk-9.0/psa-health-monitor-notification.php

Cause

Some sw-engine child processes are stuck and cannot be stopped normally.

Resolution

1. Connect to the server via SSH.

2. Stop sw-engine service:

   # service sw-engine stop
   Stopping sw-engine-fpm: [ OK ]

3. Kill stuck processes:

   # kill -9 <process_ID>

   where <process_ID> are IDs of stuck sw-engineprocesses from ps aux command

4. Start sw-engine service:

   # service sw-engine start
   Starting sw-engine-fpm: [ OK ]

Additional information

Process sw-engine produces high CPU usage