npty man page on HP-UX

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npty(5)								       npty(5)

NAME
       npty - maximum number of BSD pseudo terminals (ptys)

VALUES
   Default
   Allowed Values
DESCRIPTION
       is  the	number of pseudo terminal (pty) drivers that a system can sup‐
       port.  The pty driver provides  support	for  a	device-pair  called  a
       pseudo  terminal.   A pseudo terminal is a pair of character devices, a
       master device, and a slave device.  These allow	communication  between
       an  application process and a server process.  When sending data to pty
       devices (such as windows), a pty device must  exist  for	 every	window
       that is open at any given time.

       Using a parameter value significantly larger than the number of ptys is
       not recommended.	 An  excessively  large	 value	wastes	kernel	memory
       space.

   Who Is Expected to Change This Tunable?
       Users with the privilege.  See privileges(5) for more information about
       privileged access on systems that support fine-grained privileges.

   Restrictions on Changing
       Changes to this tunable take effect at the next reboot.

   When Should the Value of This Tunable Be Raised?
       This tunable value needs to be raised when the system runs out of ptys.

   What Are the Side Effects of Raising the Value?
       More system memory is used.

   When Should the Value of This Tunable Be Lowered?
       This value should be lowered when a minimal system is being created.

   What Are the Side Effects of Lowering the Value?
       The system may run out of ptys.

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), privileges(5), pty(7).

			   Tunable Kernel Parameters		       npty(5)
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