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Full Discussion: File Handles
Top Forums UNIX for Advanced & Expert Users File Handles Post 5159 by Neo on Wednesday 8th of August 2001 08:11:16 AM
Old 08-08-2001
You mean 'file descriptors' (FDs) I think. The total number of FDs are kernel parameters. Depending on what UNIX flavor you are running, the kernel documentation and souce code has this info. Some systems are easier than other to reconfigure.

Also, there are formulas to change these parameters because raising or lowering one key kernel parameter effects others (like a balance or scale.... commonly referred to as a design trade-off.)

So, as you know, you can't just make this parameter 100000000000 without seriously impacting (in a negative way) your system performance.
 

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LEARN ABOUT HPUX

nstrsched

NSTRSCHED(5)							File Formats Manual						      NSTRSCHED(5)

NAME

       NSTRSCHED - number of STREAMS scheduler daemons to run

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION

       This  tunable  defines  the  number  of multiprocessor (MP) STREAMS scheduler daemons to run on systems containing more than one processor.
       Note that uniprocessor (UP) systems do not use an MP scheduler daemon, but both MP and UP systems always  have  one  UP	STREAMS  scheduler
       (supsched).

       If  the	tunable  value is set to zero, the system determines how many daemons to run, based on the number of processors in the system.	If
       the tunable value is set to a positive, non-zero value, that is the number of smpsched daemons that will be created on an MP system.

       Note: This tunable is for use by specific HP products only.  It may be removed in future HP-UX releases.

   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?
       This tunable is for use by specific HP products only.  It may be removed in future HP-UX releases.

   What Are the Side Effects of Raising the Value of This Tunable?
       It could change the system performance unpredictably.

   When Should the Value of This Tunable Be Lowered?
       This tunable is for use by specific HP products only.  It may be removed in future HP-UX releases.

   What Are the Side Effects of Lowering the Value of This Tunable?
       It could change the system performance unpredictably.

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

WARNINGS

       This tunable is for use by specific HP products only.

       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						      NSTRSCHED(5)
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