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nstrpty(5) [hpux man page]

nstrpty(5)							File Formats Manual							nstrpty(5)

NAME

       nstrpty - maximum number of STREAMS-based pseudo terminals (pts)

VALUES

   Default
   Allowed Values
DESCRIPTION

       is  the number of STREAMS-based pseudo terminal (pts) drivers that a system can support.  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	communica-
       tion 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.

       should  be set to a value that is equal to, or greater than, the number of pty devices on the system that will be using	STREAMS-based  I/O
       pipes.	Using a parameter value significantly larger than the number of ptys is not recommended.  is used when creating data structures in
       the kernel to support STREAMS-based ptys, and 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 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), privileges(5), pts(7).

							     Tunable Kernel Parameters							nstrpty(5)

Check Out this Related Man Page

STRMSGSZ(5)							File Formats Manual						       STRMSGSZ(5)

NAME

       STRMSGSZ - maximum size of streams message data (bytes)

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION

       This  tunable  limits the number of bytes of message data that can be inserted by or in the data portion of any streams message on the sys-
       tem.  If the tunable is set to zero, there is no limit on how many bytes can be placed in the data segment of the message.

       returns if the buffer being sent is larger than the current value of segments the data into multiple messages.

   Who Is Expected to Change This Tunable?
       Any customer.

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

   When Should the Value of This Tunable Be Raised?
       The tunable should be increased by any customer if the customer's STREAMS module/driver(s) require a longer message size in the	data  por-
       tion than the current value.

   What Are the Side Effects of Raising the Value of This Tunable?
       The kernel will use more memory.  During low memory situations, it may bring down system performance due to frequent swapping.

   When Should the Value of This Tunable Be Lowered?
       The  tunable  could  be lowered by any customer if the customer's STREAMS module/driver(s) do not require a longer message size in the data
       portion than the current value.

   What Are the Side Effects of Lowering the Value of This Tunable?
       Possible improper functioning in any of the STREAMS module/driver(s).  Possible performance degradation, particularly in networking.

   What Other Tunable Should Be Changed at the Same Time as This One?
       None.

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.

							     Tunable Kernel Parameters						       STRMSGSZ(5)
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