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Full Discussion: Need help to understand chatr command
Operating Systems HP-UX Need help to understand chatr command Post 302242877 by jim mcnamara on Friday 3rd of October 2008 06:36:15 AM
Old 10-03-2008
chatr is mostly used for changing the attributes of a compiled image file. See setrlimit or ulimit.

Since programs dynamically allocate memory, you cannot tell anything from the compiled image about memory usage.

There can be per process limits set with ulimit. The kernel parameter maxdsize determines the maximum allowable data size for a process - this is from the manual:

Quote:
NAME
maxdsiz, maxdsiz_64bit — maximum size (in bytes) of the data segment for any user process

VALUES

Default
32bit: 1 GB

64bit: 4 GB

Allowed values

32 bit minimum: 0x40000

32 bit maximum: 0xfffff000

64 bit minimum: 0x40000

64 bit maximum: 0x3ffbffff000

DESCRIPTION
User programs on HP-UX systems are composed of five discrete segments of virtual memory: text (or code), data, stack, shared, and I/O. Each segment occupies an architecturally defined range of the virtual address space that sets the upper limit to their size, but text, data and stack segments may have smaller maxima enforced by the maxtsiz, maxdsiz, and maxssiz tunables.

This tunable defines the maximum size of the static data storage segment for 32-bit and 64-bit processes. The data storage segment contains fixed data storage such as globals, arrays, static variables, local variables in main(), strings, and space allocated using sbrk() and malloc(). In addition, any files memory mapped as private and shared library per-invocation data also resides in the data segment.

HTH
 

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LEARN ABOUT HPUX

shlib_debug_enable

shlib_debug_enable(5)						File Formats Manual					     shlib_debug_enable(5)

NAME

       shlib_debug_enable - dynamically enable or disable online shared library debugging support

VALUES

   Fail Safe
   Default
       semantics is disabled

   Allowed values
DESCRIPTION

       This  tunable  dynamically  enables  (1) or disables (0) the online shared library debugging feature.  When this tunable is enabled, shared
       libraries of a running (active) application can be debugged.

   Who Is Expected to Change This Tunable?
       System administrators and developers who want to change the default behavior of

   Restrictions on Changing
       Changes to this tunable take effect immediately.  There is no need to reboot the system.

   When Should the Tunable Be Turned On?
       When there is a need to debug a shared library of a running (active) application, this tunable can be turned on.

       When this feature/tunable is not enabled, debugging of shared libraries can be done at application start time  through  the  command.   See
       chatr(1).

   What Are the Side Effects of Turning the Tunable On?
       If  an application which is being debugged for shared libraries is not MPAS (Mostly Private Address Space) executable, then the application
       will be converted to an MPAS executable type.  After the conversion, all rules which apply to regular MPAS executable type  does  apply	to
       the converted application until the process exits.  The rules apply even after being detached from the debugger.

   When Should the Tunable Be Turned Off?
       Administrators and/or developers who will not need the online debugging feature of shared libraries.

   What Are the Side Effects of Turning the Tunable Off?
       When  this  tunable  is	disabled,  then online debugging of shared libraries will not be possible beyond the existing hardware break point
       facility.  With hardware break points, only a limited number of breakpoints can be set.

   What Other Tunables 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.

       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

       chatr(1).

HP Integrity Systems Only				     Tunable Kernel Parameters					     shlib_debug_enable(5)
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