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Full Discussion: ulimit command
Operating Systems Solaris ulimit command Post 302106788 by mhm4 on Monday 12th of February 2007 05:12:29 PM
Old 02-12-2007
Quote:
Originally Posted by inquirer
Hi,

I have a Sun machine 5.8 and would like to modify the ulimit parameter for numner of file descriptors.

the output of plimit <process name> is:

Code:
4100: process_name
resource              current         maximum
  time(seconds)         unlimited       unlimited 
  file(blocks)          unlimited       unlimited
  data(kbytes)          unlimited       unlimited
  stack(kbytes)         8192            unlimited
  coredump(blocks)      unlimited       unlimited
  nofiles(descriptors)  30000           30000 
  vmemory(kbytes)       unlimited       unlimited

I need to increase the number of file descriptor by 512. I will insert this command on the script:

Code:
ulimit -n 512

The script will look something like this:

Code:
#!/usr/bin/ksh -a
#
NAME=testprocess
export NAME
ulimit -n 512
exec /opt/bin/process "$@"

I haven't used this command before. Will this increase the existing size to 512 or will it reduce the nofiles to 512?

I am unable to determine the nofiles using the plimit. how would I know the current settings for nofiles? so that I can know if the "ulimit -n 512" command is correct.

Also, does it have a maximum value for that one? And also the impact on the system resources as well.

I can not test this one until I am sure since I will be doing it on a live network.

Thanks.
Remember you may need to update /etc/system for the changes you plan on making to be persistent across reboots.
 

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ULIMIT(3)						     Linux Programmer's Manual							 ULIMIT(3)

NAME
ulimit - get and set user limits SYNOPSIS
#include <ulimit.h> long ulimit(int cmd, long newlimit); DESCRIPTION
Warning: This routine is obsolete. Use getrlimit(2), setrlimit(2), and sysconf(3) instead. For the shell command ulimit(), see bash(1). The ulimit() call will get or set some limit for the calling process. The cmd argument can have one of the following values. UL_GETFSIZE Return the limit on the size of a file, in units of 512 bytes. UL_SETFSIZE Set the limit on the size of a file. 3 (Not implemented for Linux.) Return the maximum possible address of the data segment. 4 (Implemented but no symbolic constant provided.) Return the maximum number of files that the calling process can open. RETURN VALUE
On success, ulimit() returns a nonnegative value. On error, -1 is returned, and errno is set appropriately. ERRORS
EPERM A unprivileged process tried to increase a limit. CONFORMING TO
SVr4, POSIX.1-2001. POSIX.1-2008 marks ulimit() as obsolete. SEE ALSO
bash(1), getrlimit(2), setrlimit(2), sysconf(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2008-08-06 ULIMIT(3)
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