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Operating Systems AIX ulimits max locked memory virtual memory Post 302224017 by big123456 on Tuesday 12th of August 2008 03:46:36 AM
ulimits max locked memory virtual memory

Hi,
Would any one be so kind to explain me :
are ulimits defined for each user seperately ? When ?
Specialy what is the impact of :
max locked memory
and
virtual memory

on performance of applications for a user.

Many thanks.

PS :
this is what I can see in MAN :
Code:
ulimit [-SHacdflmnpstuv [limit]]
              Provides control over the resources available to the shell and to processes started by it, on systems that allow such control.  The -H and -S options  spec-
              ify  that  the  hard  or soft limit is set for the given resource.  A hard limit cannot be increased once it is set; a soft limit may be increased up to the
              value of the hard limit.  If neither -H nor -S is specified, both the soft and hard limits are set.  The value of limit can be a number in the  unit  speci-
              fied  for  the resource or one of the special values hard, soft, or unlimited, which stand for the current hard limit, the current soft limit, and no limit,
              respectively.  If limit is omitted, the current value of the soft limit of the resource is printed, unless the -H option  is  given.   When  more  than  one
              resource is specified, the limit name and unit are printed before the value.


Last edited by big123456; 08-12-2008 at 05:10 AM..
 
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munlockall(2)							System Calls Manual						     munlockall(2)

NAME
munlockall() - unlock the entire virtual address space of a process SYNOPSIS
DESCRIPTION
The system call allows the calling process to unlock any portions of its virtual address space that have previously been locked into memory with or including any portions locked due to the option of Upon successful completion of the all pages within the process virtual address space are subject to routine paging and/or swapping and the option will no longer be in effect for the process. Regardless of how many times a process locks a page, a single will unlock it. When memory is shared by multiple processes and mlocks are applied to the same physical page by multiple processes, a page remains locked until the last lock is removed from that page. The effective user ID of the calling process must be a user with the privilege. Although and the family of functions may be used together in an application, each may affect the other in unexpected ways. This practice is not recommended. Security Restrictions Some or all of the actions associated with this system call require the privilege. Processes owned by the superuser have this privilege. Processes owned by other users may have this privilege, depending on system configuration. See privileges(5) for more information about privileged access on systems that support fine-grained privileges. RETURN VALUE
returns the following values: Successful completion. Failure. The requested operation is not performed. is set to indicate the error. ERRORS
If fails, is set to the following value: The effective user ID of the calling process is not a user with the privilege. EXAMPLES
The following call to unlocks the process virtual address space: SEE ALSO
setprivgrp(1M), getprivgrp(2), mlock(2), mlockall(2), munlock(2), plock(2), privileges(5). STANDARDS CONFORMANCE
munlockall(2)

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