The sw-engine process causes high CPU usage on a Plesk server

[senthil]

Symptoms
The sw-engine process causes high CPU usage:

Code Select Expand

#ps aux | grep sw-engine
root 1242 0.0 0.3 348136 28732 ? Ss Jan14 0:14 /usr/bin/sw-engine -
/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
Plesk may fail to load with a 502 error.

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

Resolution

• Connect to the Plesk server via SSH.
• Stop the sw-engine service:
  
  Code Select Expand
  #service sw-engine stop
Stopping sw-engine-fpm: [ OK ]
• Find stuck sw-engine processes and their PID:
  
  Code Select Expand
  #ps aux | grep sw-engine
psaadm 1597 0.0 2.1 274896 44100 ? Ss 12:39 0:00 /usr/bin/sw-engine -c
/usr/local/psa/admin/conf/php.ini /usr/local/psa/admin/plib/WebSocket/bin/ws-
server.php
psaadm 1842 0.0 2.3 278952 49564 ? S 12:42 0:00 /usr/bin/sw-engine -c
/usr/local/psa/admin/conf/php.ini /usr/local/psa/bin/extension --exec revisium-
antivirus ra_executor.php
• Kill these stuck processes using their PID. In the example above, they are 1597 and 1842:
  
  Code Select Expand
  #kill -9 1597 1842
• Start the sw-engine service:
  
  Code Select Expand
  #service sw-engine start
Starting sw-engine-fpm: [ OK ]