aio_listio_max(5) aio_listio_max(5)
Tunable Kernel Parameters
NAME [Toc] [Back]
aio_listio_max - the maximum number of POSIX asynchronous I/O
operations that can be specified in a listio() call
VALUES [Toc] [Back]
Failsafe
256
Default [Toc] [Back]
256
Allowed values [Toc] [Back]
The minimum value allowed is 2. The maximum value allowed is
0x100000. The value is further constrained in that it must be less
than or equal to aio_max_ops.
Specify a positive integer value.
DESCRIPTION [Toc] [Back]
This parameter places a limit on the system resources that can be
consumed if a large number of POSIX asynchronous I/O operations are
requested in a single listio() call. The value should be set large
enough to meet system programming needs while protecting the system
against excessive asynchronous I/O operations initiated by a
malfunctioning process.
Who Is Expected to Change This Tunable?
System administrators that run applications requiring heavy usage of
POSIX AIO to file systems.
Restrictions on Changing [Toc] [Back]
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 aio_listio_max must be less than or equal to
aio_max_ops.
WARNINGS [Toc] [Back]
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 tunable
values, consult the documentation for the kernel software being
installed. For information about optional kernel software that was
factory installed on your system, see HP-UX Release Notes at
http://docs.hp.com.
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: Sep 2004
aio_listio_max(5) aio_listio_max(5)
Tunable Kernel Parameters
AUTHOR [Toc] [Back]
aio_listio_max was developed by HP.
SEE ALSO [Toc] [Back]
kctune(1M), sam(1M), gettune(2), settune(2), aio(5), aio_max_ops(5).
Hewlett-Packard Company - 2 - HP-UX 11i Version 2: Sep 2004 [ Back ] |
