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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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LEARN ABOUT MOJAVE

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 of the current process, in units of 512-byte blocks.

     UL_SETFSIZE  will attempt to set the maximum file size of the current process and its children, using 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