To improve memory management on your Raspberry PI you may need to add an additional swap space. In this config you will learn how to add additional swap memory to your Raspberry PI with Raspbian.
First, you need to create a swap space eg. 500MB
dd if=/dev/zero of=/swap bs=1M count=512
Format your new swap space:
# mkswap /swap
What has left is to enable your new /swap space:
# swapon /swap
To make your new swap space enabled permanently even after reboot you need to add a following line to your /etc/fstab file:
/swap none swap sw 0 0