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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
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.
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ulimit(3)						     Library Functions Manual							 ulimit(3)

ulimit - Sets and gets process limits LIBRARY
Standard C Library (libc.so, libc.a) SYNOPSIS
#include <ulimit.h> long int ulimit ( int command, ... ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: ulimit(): XSH4.2 Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies the form of control. The command parameter can have the following values: Returns the soft file size limit of the process. The limit is reported in 512-byte blocks (see the sys/param.h file) and is inherited by child processes. The function can read files of any size. The return value is the integer part of the soft file size limit divided by 512. If the result cannot be represented as a long int, the result is unspecified. Sets the hard and soft process file size limit for output operations to the value of the second parame- ter, taken as a long int value, and returns the new file size limit. Any process can decrease its own hard limit, but only a process with superuser privileges can increase the limit. The hard and soft file size limits are set to the specified value multiplied by 512. If the result would overflow an rlim_t, the actual value set is unspecified. [Tru64 UNIX] Returns the maximum possible break value as described in the brk(2) reference page. DESCRIPTION
The ulimit() function controls process limits. During access to remote files, the process limits of the local node are used. NOTES
The ulimit() function is implemented with calls to setrlimit(). The two interfaces should not be used in the same program. The result of doing so is undefined. RETURN VALUES
Upon successful completion, ulimit() returns the value of the requested limit and does not change the setting of errno. Otherwise, a value of -1 is returned, and errno is set to indicate the error. ERRORS
If the ulimit() function fails, the limit remains unchanged and errno is set to one of the following values: The command parameter is invalid. A process without appropriate system privileges attempted to increase its file size limit. As all return values are permissable in a successful situation, an application wishing to check for error situations should set errno to 0, then call ulimit(), and, if it returns -1, check to see if errno is nonzero. RELATED INFORMATION
Commands: ulimit(1) Functions: brk(2), getrlimit(2), write(2) Routines: pathconf(2) Standards: standards(5) delim off ulimit(3)

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