aio_max_ops(5)							File Formats Manual						    aio_max_ops(5)

NAME

       aio_max_ops - maximum number of POSIX async I/O operations that can be queued at any time

VALUES

   Failsafe
   Default
   Allowed values
       The minimum value allowed is The maximum value allowed is The value is further constrained in that it must be greater than or equal to

       Specify a positive integer value.

DESCRIPTION

       This parameter places a limit on the system resources that can be consumed if large numbers of POSIX asynchronous I/O operations are queued
       on the system at the same time.	This parameter limits the ability of competing processes to overwhelm the system  with	large  numbers	of
       asynchronous I/O operations and the memory they require.

       Each enqueued asynchronous operation requires allocation of system memory for its internal control structure, thus making this limit neces-
       sary.  In addition to the system-wide limit, there is a per-process limit that is controlled using the argument to and calls.

       limits the number of operations that can be contained in a single call from a given process, and the value of must be  sufficient  to  meet
       the  reasonable	needs  of all processes that are making simultaneous or nearly simultaneous calls without jeopardizing overall system bal-
       ance.

   Who Is Expected to Change This Tunable?
       System administrators that run applications requiring heavy usage of POSIX AIO to file systems.

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

   What Other Tunables Should Be Changed at the Same Time as This One?
       The value assigned to must be greater than or equal to

WARNINGS

       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), gettune(2), settune(2), getrlimit(2), setrlimit(2), aio(5), aio_listio_max(5).

							     Tunable Kernel Parameters						    aio_max_ops(5)