ulimit

[Lee Huei]

Hi,

can stack size be set to unlimited value ?


thks

[Sridhar Bhaskarla]

Hi,

No. It can only be set upto the value of the kernel parameter maxssiz_64bit (for 64bit OSes). To find the maxssiz values, use

kmtune -l -q maxssize(_64bit)

Increasing the kernel parameter means recompiling the kernel and rebooting the system.

-Sri

[Lee Huei]

hi,

how about data size? can it be set to unlimited value?

thks

[Sridhar Bhaskarla]

Hi,

Nop. Though it may say 'unlimited' still it is limited to the kernel parameter maxdsiz(_64bit).

-Sri

[Sยภเl Kย๓คг]

Mico
It is not possible to set the stack size to unlimited.
It is only possible to set to the maximum value of stack size
"maxssiz" is in the case of a 32 bit os
and "maxssiz_64bit" in the case of a 64 bit os
regards
SK

[Mei Jiao · Accepted solution]

As for sh-posix shell, the sh is only a 32-bit binary, therefore 'stack' size is bound to kernel parameter 'maxssiz'.

To verify this, you can run the 'file' command against the binary files:
If it's PA-RISC1.1 and/or SOM, then it's 32-bit.
If it's PA-RISC2.0 and/or ELF, then it's 64-bit.

Therefore, I believe the stack size is reference to the maxssiz only as it's a 32-bit binary even though the OS is 64-bit OS Kernel Bits.

I have done this testing yesterday. Kindly correct me if I'm wrong.

[Mei Jiao]

Sridhar,

# ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) unlimited <----
stack(kbytes) 392192
memory(kbytes) unlimited
coredump(blocks) 392192

I also think that data size cannot be set to 'unlimited', however I saw the output as above. After seeing your message, although the above shows 'unlimited', data size still limited by maxdsiz right?

Thank you.

[Sridhar Bhaskarla]

Hi Mei,

Yes. Just because it displays the data segment size as 'unlimited', it doesn't mean you can create one with more than maxdsiz(_64bit) size. You cannot exceed system wide limits. Moreover, one can only reduce the values using ulimit. So, if your SystemsAdministrator decided to give you only half of maxdsiz, then you cannot increase it beyond that value without the intervention of your SA.

-Sri