How to check an average memory usage by single PHP-FPM process

php.md

ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
ps --no-headers -o "rss,cmd" -C apache2 | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'

pm.max_children = Total RAM dedicated to the web server / Max child process size

hi
i run this command:
ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
but return negative number
-2147483647M

hi
i run this command:
ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
but return negative number
-2147483647M

hi
i run this command:
ps --no-headers -o "rss,cmd" -C php-fpm | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'
but return negative number
-2147483647M

Check your PHP-fpm version.
ps --no-headers -o "rss,cmd" -C php-fpm{version-here} | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'

For PHP 7.3

ps --no-headers -o "rss,cmd" -C php-fpm7.3 | awk '{ sum+=$1 } END { printf ("%d%s\n", sum/NR/1024,"M") }'