Commands were tested with Debian - other systems may require diff flags/cmds
* indicate source for more info
Find free/used memory
free -mh
Find PHP FPM Memory Usage *
ps -eo size,pid,user,command --sort -size | awk '{ hr=$1/1024 ; printf("%13.2f Mb ",hr) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | grep php-fpm