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Plesk sw-engine process causes high CPU usage

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Alexandr Tumanov
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Applicable to:

  • Plesk for Linux

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

Comments

2 comments

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    Bryan Muthig

    What is the long term solution to this problem?  Is there an upgrade available to fix this problem?  Please elaborate on how to prevent this from occurring in the first place.

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  • Avatar
    Bato Tsydenov

    @Bryan Muthig

    There are various causes why fpm service can get stuck.

    Such issues should be checked individually.

    If you are facing such issue I recommend you submit a Support ticket:

    How to submit a request to Plesk support?

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