- http://ubuntuforums.org/showthread.php?t=1961208
- http://www.lognormal.com/blog/2012/09/27/linux-tcpip-tuning/
- http://askubuntu.com/a/162230/110504
- http://ithubinfo.blogspot.com.tr/2013/07/how-to-increase-ulimit-open-file-and.html
cat /proc/sys/fs/file-max