FreeBSD
ps aux -h | sort -rn -k 5,6
vmstat -m*Use zfs-stats to check how much is zfs using from your memory
Linux
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 "" }'