HOWTO add swap space on linux system

Step:

1. login to root user

su root

2. create swap file for desired size

dd if=/dev/zero of=/swapfile1 bs=1024 count=524288

NOTE: bs = size in bytes and count = ( bs * desired space)

if you want to increase 1g then count will calculate in following way

1024 * 1024 = 1048576

3. setup linux swap area

# mkswap /swapfile1

4. Activiate swapfile space

# swapon /swapfile1

5. check "free-m" command on # prompt

$ free -g

check for more info: http://www.cyberciti.biz/faq/linux-add-a-swap-file-howto/