yes, I collect the data on memory with "free -o". Here's part of the script that collects data:
/usr/bin/free -o | grep "Mem" | /usr/bin/gawk '{ print $2":"$3":"$4 ; }'`:`/usr/bin/free -o | grep "Swap" | /usr/bin/gawk '{ print $2":"$3":"$4 ; }'`
what is it that you find strange?