05-20-2014
As suggested by others why would you want to set limits for root? If you limit root you risk locking yourself out of the OS. Any applications running should run as a user created for the task, you can then apply limits to that user to protect the servers performance without risking blocking the root user.
Just today we had an application spin out of control and hit the limit of processes for the user account which had started the application. This meant that application support could not login to the server, but as root I was able to login and kill the rogue process.
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LEARN ABOUT FREEBSD
ulimit
ULIMIT(3) BSD Library Functions Manual ULIMIT(3)
NAME
ulimit -- get and set process limits
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <ulimit.h>
long
ulimit(int cmd, ...);
DESCRIPTION
The ulimit() function will get and set process limits. Currently this is limited to the maximum file size. The cmd argument is one of the
following:
UL_GETFSIZE will return the maximum file size in units of 512 blocks of the current process.
UL_SETFSIZE will attempt to set the maximum file size of the current process and its children with the second argument expressed as a long.
RETURN VALUES
Upon successful completion, ulimit() returns the value requested; otherwise the value -1 is returned and the global variable errno is set to
indicate the error.
ERRORS
The ulimit() function will fail if:
[EINVAL] The command specified was invalid.
[EPERM] The limit specified to ulimit() would have raised the maximum limit value, and the caller is not the super-user.
SEE ALSO
getrlimit(2)
STANDARDS
The ulimit() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The ulimit() function first appeared in FreeBSD 5.0.
BUGS
The ulimit() function provides limited precision for setting and retrieving process limits. If there is a need for greater precision than
the type long provides, the getrlimit(2) and setrlimit(2) functions should be considered.
BSD
January 4, 2003 BSD