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Count PHP-FPM processes per pool

harmlessPHPalle
user@server
ps -eo args | grep '[p]hp-fpm: pool' | awk '{print $NF}' | sort | uniq -c | sort -rn

Reads the process names of all PHP-FPM workers that match the pattern php-fpm: pool <name> and counts them per pool. On Plesk, the pool name matches the domain. If a pool is constantly at its pm.max_children limit, requests have to wait and the site becomes slow.

Note: The warning server reached pm.max_children setting appears in the FPM log of the respective PHP version.

Also searched as

  • which site is causing high load
  • php-fpm max_children reached
  • too many php processes

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$ps -C apache2 --no-headers | wc -l
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List available PHP handlers in Plesk

#plesk bin php_handler --list
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$find /var/www/vhosts/example.com/httpdocs/wp-content/themes -name '*.php' -exec php -l {} \; 2>&1 | grep -v '^No syntax errors'
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Check Composer packages for known vulnerabilities

$composer audit --working-dir=/var/www/vhosts/example.com/httpdocs
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