How To find the memory leak?

[THPubs]

Im preparing a web-server and have already installed Wordpress on it. Everything worked fine. But instantly, the memory usage went up. Now I only have 300MB of memory free. To check the problem, I disabled some services like php, nginx, fail2ban, psad and mysql. It reduced the memory usage by a small amount but still its too high.

Then I restarted the machine and started working again. Again after some time, the memory usage shot up! How can I locate the exact problem? What might be causing this issue?

PS : Its an Ubuntu

PS : It looks like the swap is not yet used. Swap usage : 0 (The server is a virtual machine (KVM))

[Bachstelze]

How are you checking the amount of free memory?

[THPubs]

How are you checking the amount of free memory?

The output of free -m

total used free shared buffers cached
Mem: 2003 1764 238 0 43 1350
-/+ buffers/cache: 370 1633
Swap: 2043 0 2043

[Bachstelze]

Read this: http://www.linuxatemyram.com/

[THPubs]

Read this: http://www.linuxatemyram.com/

Thanks a lot for the explanation