You can use this bash script to monitor your F5 memory
#!/bin/bash
## Script for logging memory usage stats
while true; do
DATE=`date -u`
echo $DATE >> /shared/tmp/f5-mem-stats.log
tmsh show /sys memory | egrep 'TMM Memory' -A 4 >> /shared/tmp/f5-mem-stats.log
top -n 1 | egrep 'Swap' >> /shared/tmp/f5-mem-stats.log
echo "-----------------------------------------------------" >> /shared/tmp/f5-mem-stats.log
sleep 5
done