File descriptor limit - Revision history

Pbug at 12:58, 6 October 2005

2005-10-06T12:58:53Z

← Older revision		Revision as of 05:58, 6 October 2005
Line 10:		Line 10:
	1024		1024

	This displays the soft and hard limits respectively. One can set the soft limit up to the hard limit but not beyond unless you're root. The hard limit is compiled into the kernel at compile time and is defined as the following in /usr/include/sys/param.h as NOFILE_MAX:		This displays the soft and hard limits respectively. One can set the soft limit up to the hard limit but not beyond unless you're root. The default hard limit is compiled into the kernel at compile time and is defined as the following in /usr/include/sys/param.h as NOFILE_MAX:

	#define NOFILE_MAX 1024 /* max open files per process (hard) */		#define NOFILE_MAX 1024 /* max open files per process (hard) */

Pbug at 12:57, 6 October 2005

2005-10-06T12:57:55Z

← Older revision		Revision as of 05:57, 6 October 2005
Line 14:		Line 14:
	#define NOFILE_MAX 1024 /* max open files per process (hard) */		#define NOFILE_MAX 1024 /* max open files per process (hard) */

	Only root can go set the hardlimit above 1024 and the limit to this is kern.maxfiles. The hardlimit can also be set in the /etc/login.conf file as openfiles-max.		Only root can go set the hardlimit above 1024 and the limit to this is kern.maxfiles. The hardlimit can also be set in the /etc/login.conf file as openfiles-max. The softlimit is definable in the said file as openfiles-cur.

	[[FreeBSD]] is different:		[[FreeBSD]] is different:

Pbug at 12:56, 6 October 2005

2005-10-06T12:56:49Z

← Older revision		Revision as of 05:56, 6 October 2005
Line 14:		Line 14:
	#define NOFILE_MAX 1024 /* max open files per process (hard) */		#define NOFILE_MAX 1024 /* max open files per process (hard) */

	Only root can go set the hardlimit above 1024 and the limit to this is kern.maxfiles.		Only root can go set the hardlimit above 1024 and the limit to this is kern.maxfiles. The hardlimit can also be set in the /etc/login.conf file as openfiles-max.

	[[FreeBSD]] is different:		[[FreeBSD]] is different:

Pbug at 12:53, 6 October 2005

2005-10-06T12:53:15Z

New page

There is several limits a [[process]] is restricted to:

Limits for all open files in the system, or limits for number of files open in a process:

[[OpenBSD]] has 2 [[sysctl]]'s that allow one control over amount of files in the system: There is kern.maxfiles which is setable at boot, and there is kern.nfiles which displays the number of open file descriptors in the system currently. For the process there is another set of limits that one should be aware of:
$ ulimit -n
64

$ ulimit -Hn
1024

This displays the soft and hard limits respectively. One can set the soft limit up to the hard limit but not beyond unless you're root. The hard limit is compiled into the kernel at compile time and is defined as the following in /usr/include/sys/param.h as NOFILE_MAX:

#define NOFILE_MAX 1024 /* max open files per process (hard) */

Only root can go set the hardlimit above 1024 and the limit to this is kern.maxfiles.

[[FreeBSD]] is different: