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Special Forums News, Links, Events and Announcements Software Releases - RSS News RTEMS 4.8.1 (4.8.x branch)
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Old 09-10-2008
RTEMS 4.8.1 (4.8.x branch)
RTEMS (Real-Time Executive for Multiprocessor Systems) is a commercial grade real-time operating system designed for deeply embedded systems. It is a free (as in beer and speech) open-source solution that supports multi-processor systems. RTEMS is designed to support applications with the most stringent real-time requirements while being compatible with open standards such as POSIX. It includes filesystem support as well as a port of the FreeBSD TCP/IP stack. It's been ported to numerous processor architectures including ARM, Blackfin, PowerPC, i386, M68K, Coldfire, MIPS, NIOS2, SPARC, SH, H8, and C3x/C4x DSPs. Using the GNU tools for cross development, you can use any number of systems as development hosts including both Unix and Windows platforms. There are pre-built cross development toolsets for RPM-based GNU/Linux distributions and MS Windows.Image

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LEARN ABOUT HPUX

ninode

ninode(5)							File Formats Manual							 ninode(5)

NAME

       ninode - maximum number of HFS file system open inodes that can be in memory

VALUES

   Failsafe
   Default
       The  default  value is computed at runtime and depends on the amount of physical memory on the system.  For small memory systems (less than
       1GB), the default is 4880.  For systems with more than 1GB of memory, the default is 8192, or 8K.

   Allowed values
       The minimum value allowed is 14.  The maximum value allowed is memory limited.

       Specify a positive integer value.

DESCRIPTION

       The tunable defines the number of slots in the HFS inode table.	This number limits the number of open inodes that can be in memory for HFS
       file  systems  at  any  given  time.   The inode table is used as a cache memory.  For performance reasons the most recent (number of) open
       inodes are kept in main memory.	The table is hashed.

       Each unique open file has an open inode associated with it.  Therefore, the larger the number of unique open files, the larger should be.

   Who Is Expected to Change This Tunable?
       This tunable is only relevant on systems where there are HFS file systems mounted.  Note that the use of HFS file systems is  being  depre-
       cated in HP-UX.

   Restrictions on Changing
       This tunable is static.	Any changes to the value of this tunable will require system reboot to take effect.

   When Should the Value of This Tunable Be Raised?
       This value of many need to be raised on systems running applications that expect large numbers of open files on HFS file systems.

   What are the Side Effects of Raising the Value?
       The HFS inode table is statically allocated, therefore will consume more memory if the value of this tunable is raised.

   When Should the Value of This Tunable Be Lowered?
       The value of can be lowered on systems with small or no mounted HFS file systems, to reduce memory consumption.

   What are the Side Effects of Lowering the Value?
       The number of open HFS inodes that can be kept in memory is bound to the new lower limit.

   What Other Tunable Values Should Be Changed at the Same Time?
       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.

       The tunable is relevant only on systems with HFS file systems.  Note that the use of HFS file systems is being deprecated in  HP-UX.   This
       and other HFS related tunable parameters may be removed from future HP-UX releases.

       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), sam(1M), gettune(2), settune(2).

							     Tunable Kernel Parameters							 ninode(5)