Changing limits with ulimit (Lab 3.1)
Hi everyone,
I am a bit unclear as to why exercise #4 in lab 3.1 results in an operation not permitted error. The solution states, "Note that if we had chosen a different limit, such as stack size (-s) we could raise back up again as the hard limit is unlimited.". What exactly does stack size refer to and how does it make a difference?
Thanks in advance.
Comments
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Hi,
From the documentation:
ulimit [-HSTabcdefilmnpqrstuvx [limit]]
Provides control over the resources available to the shell and to processes
started by it, on systems that allow such control. The -H and -S options specify
that the hard or soft limit is set for the given resource. A hard limit cannot be
increased by a non-root user once it is set; a soft limit may be increased up to
the value of the hard limit.==> a soft limit may be increased up to the value of the hard limit.
If you want to take a look, check the man or info page for ulimit.
Regards,
Luis.
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Luis,
Please note that my question refers to the meaning of the words stack size, and how that would have made a difference in the proposed lab exercise.
PS: Since ulimit is a shell builtin, it does not have a standalone man page. And as far as I can see, neither the shell builtins' man page nor the info page on ulimit explain the concept of stack size.
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you can get info on "ulimit" by typing "help ulimit" as it is a built in bash command. You can't expect that to exlain what all the possibility parameters do.
Stack is the amount of memory avaialble to a process for static variables, such as arrays and other storage. Every process created is allotted such memory when it starts; by default on Linux 8MB is granted usually -- that is not so much unless you start creating thousands of processes, such as a server might, in which case you might want to limit it.
The stack is an important *programming* concept in any computing language, but a normal user would not be terribly aware of it. I'm sure a little bit of googing or look at the wikipedia would give you a deeper undrerstanding of its role in any operating system, nut just Linux.
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