Process to use open files Post: 302965361

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Operating Systems Linux Red Hat Process to use open files Post 302965361 by ust on Wednesday 27th of January 2016 08:34:52 PM

01-27-2016

Registered User

Quote:

Originally Posted by jim mcnamara

Try ulimit -u first and see if that does not meet your needs.
Chack back with us if that will not do. But. Be forewarned:

Code:

1. some command line utilities like awk may have  predefined limits on open files, so you may have to write C, or C++ code to "test".

2. You are going to create lots of worthless files in order to test, 
   files that you need to clean up later, depending on how you write code
   or what tool you use.

3. Assume ulimit shows 4096
   you will need to try to open more files than that and look for an error
   and print the step (number of files) when it bombs

thanks reply ,

thanks reply ,

what I want to have a process that use open files up to a certain amount .

in my case , I have set the ulimit -u to 2048 in my system , I would like to have a process that will use the open files up to a certain amount eg. 1000 , that I can test my application when the current open files is at the amount of 1000 .

may I know if use a script which have a loop to open file continously , is it work ?

thanks

ust

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LEARN ABOUT SUSE

ulimit

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       Warning: This routine is obsolete.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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