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. Stop sw-engine service:

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

2. Kill stuck processes:

   # kill -9 <process_ID>
   

3. Start sw-engine service:

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

Additional information

Process sw-engine produces high CPU usage