Visit Our UNIX and Linux User Community

setting ulimit -n with a value more than 1024000

Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users setting ulimit -n with a value more than 1024000
# 8  
Old 08-04-2009
Originally Posted by Hsianglung Wu
Thank you for the replies.

Actually I tried ulimit -n unlimited before and I got the same error as using
ulimit -n <value> when value is greater than 1024000

The application indeed is running on a cluster setting. In the extreme scaling situation the application will need to open a huge number of files concurrently. Will it have scaling issue? This is a part of my intention - to find it out.

I have a feeling that it might need kernel recompilation. Any hint which conf file or .h file needs to be changed?

In AIX you can set the hard limit to -1 for an unlimited ulimit in /etc/security/limits. I think in Linux the file is /etc/security/limits.conf. Each user has its own hard limits. There should be examples in the file.

Previous Thread | Next Thread
Test Your Knowledge in Computers #237
Difficulty: Easy
Paul Baran was the first to build a theoretical model for communication using packet switching.
True or False?

10 More Discussions You Might Find Interesting

1. Solaris

Help with setting coredumpsize using ulimit

A coredump is being created by one of our applications on Solaris server and occupying entire space on the mount, thereby bringing down the application. While we try to identify the root cause, i tried to limit to limit the size of the core dump. Executed below command in shell and also updated... (2 Replies)
Discussion started by: kesani
2 Replies

2. AIX

Ulimit setting

Hi, Our application team is asking me to set ulimit parameter in my AIX 6.1 TL8 box. Some of them i set already. address space limit (kbytes) (-M) unlimited locks (-L) unlimited locked address space (kbytes) (-l) 64 nice (-e) ... (3 Replies)
Discussion started by: sunnybee
3 Replies

3. Solaris

Is there a difference between setting a user as nologin and setting it as a role?

Trying to figure out the best method of security for oracle user accounts. In Solaris 10 they are set as regular users but have nologin set forcing the dev's to login as themselves and then su to the oracle users. In Solaris11 we have the option of making it a role because RBAC is enabled but... (1 Reply)
Discussion started by: os2mac
1 Replies

4. Red Hat

setting ulimit for a user

The root user runs the following ulimit -a | grep open and gets a result of open files (-n) 8162 A user runs the same command and gets a result of open files (-n) 2500 How can you set the ulimit of the user to... (2 Replies)
Discussion started by: jsanders
2 Replies

5. Solaris


Hello, could you help me please? I write in command line: "ulimit 500" -> i've set the max size of 512-bytes blocks that i can write in one file. But when after it i use ulimit.3c in my program: "ulimit(UL_GETFSIZE);" the result turns out 1000. Why is it so? They always differ so that one is... (2 Replies)
Discussion started by: Zhenya_
2 Replies

6. UNIX for Advanced & Expert Users

Help with Ulimit Setting

All, Our SA is considering setting the max open files from 2048 to 30K. This sounds like a drastic change. Does anybody have an idea of the negative impacts of increasing the open files too high? Would like to know if this change could negatively impact our system. What test should we run to... (2 Replies)
Discussion started by: wcrober
2 Replies

7. Solaris


how do i check the ulimit set on my server.. ca i know whats the command ?? thanks in advance .. (5 Replies)
Discussion started by: expert
5 Replies

8. UNIX for Advanced & Expert Users

Setting Ulimit problem

I changed the standard Ulimit sometime back. But when I change it back, the setting does not get updated. How do I make the change permanent Waitstejo (7 Replies)
Discussion started by: Waitstejo
7 Replies

9. Shell Programming and Scripting

Setting Ulimit

How do i set ulimit for user (4 Replies)
Discussion started by: Krrishv
4 Replies

10. Solaris

ulimit setting problem on Solaris

How do you make the ulimit values permanent for a user? by default, the root login has the following ulimits: # ulimit -a time(seconds) unlimited file(blocks) unlimited data(kbytes) unlimited stack(kbytes) 8192 coredump(blocks) unlimited nofiles(descriptors) 1024 memory(kbytes)... (2 Replies)
Discussion started by: kiem
2 Replies
ULIMIT(3)						     Linux Programmer's Manual							 ULIMIT(3)

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 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at Linux 2008-08-06 ULIMIT(3)

Featured Tech Videos