NAME
maxtsiz, maxtsiz_64bit — maximum size (in bytes) of the text segment for any user process
VALUES
Default
32 bit: 96MB
64 bit: 1GB
Allowed values
32 bit minimum: 0x40000
32 bit maximum: 0x40000000
64 bit minimum: 0x40000
64 bit maximum: 0x3FFFFFFFFFF
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 which sets the upper limit to their size. However, text,
data and stack segments may have a smaller maximum enforced via the
maxtsiz,
maxdsiz
and
maxssiz
tunables.
maxtsiz
controls the size of the text segment, which is the read-only executable
object code for the process that can be shared by multiple
processes executing the same program. For example, all copies of vi on
the system use the same text segment.
Who is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
Changes to this tunable take effect immediately. The size is expected
to be a multiple of the base page size. See the description of
_SC_PAGE_SIZE
in
getconf(1)
for more details.
If the value specified is not a multiple of the base page size, it will
be rounded down to the nearest multiple of the base page size.
When Should the Value of This Tunable Be Raised?
maxtsiz
should be raised if user processes are receiving the
ENOMEM
error with the following message:
exec(2): text exceeds maxtsiz
or
exec(2): text exceeds maxtsiz_64bit
What Are the Side Effects of Raising the Value?
None.
When Should the Value of This Tunable Be Lowered?
This tunable should be lowered to limit the text
size of running processes; there is no system
performance reason to do so though.
What Are the Side Effects of Lowering the Value?
None.
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.
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 tunable values, consult the documentation
for the kernel software being installed.
For information about optional kernel software that was
factory installed on your system, see
HP-UX Release Notes
at
http://docs.hp.com.
AUTHOR
maxtsiz
was developed by HP.
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