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setting ulimit -n with a value more than 1024000


 
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Top Forums UNIX for Advanced & Expert Users setting ulimit -n with a value more than 1024000
# 8  
Old 08-04-2009
Quote:
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?


Sean
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.

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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Warning: This routine is obsolete.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 3.25 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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