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aio_max_ops(5)							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 con‐
       sumed 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 asyn‐
       chronous I/O operations and the memory they require.

       Each enqueued asynchronous operation requires allocation of system mem‐
       ory 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 balance.

   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 parame‐
       ter 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 val‐
       ues.  For information about the effects of installation on tunable val‐
       ues, 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),	 setr‐
       limit(2), aio(5), aio_listio_max(5).

			   Tunable Kernel Parameters		aio_max_ops(5)

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