maxfiles_lim(5) 						File Formats Manual						   maxfiles_lim(5)

NAME

       maxfiles_lim - hard maximum number of file descriptors per process

VALUES

   Failsafe
   Default
   Allowed values
       The  minimum  value allowed is 32.  The maximum value allowed is 1048576, or 1M.  The value is further constrained in that it must be equal
       or greater than the soft limit,

       Specify a positive integer value.

   Recommended values
       At runtime, a warning will be issued if the tunable is set to a value greater than 409600, or 400K.  This is beyond the tested limit.

       At runtime, a warning will be issued if the value is not a multiple of the file descriptor chunk (multiple of 8) size.  This is not a seri-
       ous warning, just an information message for the administrator.

DESCRIPTION

       specifies  the system hard limit for the number of file descriptors that a process is allowed to have for open files at any given time.	It
       is possible for a nonsuperuser process to increase its soft limit up to this hard limit.

   Who Is Expected to Change This Tunable?
       Anyone expecting to run applications using large numbers of file descriptors.

   Restrictions on Changing
       The tunable is dynamic (tuning will take effect immediately on the running system).

       Dynamic changes affect all existing processes in the system except:

       o  Processes that have more file descriptors allocated than allowed by the new limit,

       o  Processes that have specifically set their limits through a call to or

   When Should the Value of This Tunable Be Raised?
       The tunable should be increased when large numbers of file descriptors are expected to be open by several processes.

   What are the Side Effects of Raising the Value?
       There is no immediate effect of raising the value of However, doing so allows any process to allocate more  file  descriptors,  potentially
       consuming more system memory.

   When Should the Value of This Tunable Be Lowered?
       The value should be lowered to limit the number of open file descriptors per process on a system and reduce system memory consumption.

   What are the Side Effects of Lowering the Value?
       Lowering the value of bounds memory consumption due to file descriptors for processes that are not already over the new limit.

   What Other Tunable Values Should Be Changed at the Same Time?
       The value assigned to must be less than or equal to the value of

       Kernel checks during tunable setting ensure these restrictions.

WARNINGS

       For  values  greater  than  65535,  compatibility  for  the obsolescent will be affected.  For correct operation, all applications must use
       instead of If the system still has applications using setting to 65535 or less  will  maintain  compatibility,  unless  the  process  being
       queried has used to change its maximum limit of open files to a value greater than 65535.

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

SEE ALSO

       kctune(1M), sam(1M), setrlimit(2), gettune(2), settune(2), pstat(2), ulimit(2), maxfiles(5).

							     Tunable Kernel Parameters						   maxfiles_lim(5)