Number of Files Opened

System-Wide Settings

To show the number of files opened on a system, run:

# cat /proc/sys/fs/file-nr
1536	0	793120

The fields are:

1. Current number of opened files
2. Number of free allocated file descriptors
3. Maximum number of file descriptors for the whole system

You may change this value by:

1. cat <new value> > /proc/sys/fs/file-nr
2. Edit /etc/sysctl.conf so that there is a line
3. fs.file-max = <new value>

Per-User Settings

You can see the limits set by running ulimit on the bash shell.

# ulimit -n

You can also see the per-user limits defined in /etc/security/limits.conf:

# cat /etc/security/limits.conf

http://blog.thecodingmachine.com/content/solving-too-many-open-files-exception-red5-or-any-other-application