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The command
ulimit -s
tells you how much address space is allocated for each process's primary stack. The result is given in KB.
For a specific process that is already running, you might attach a debugger to it to see the current stack use.
You could also use the command
grep -A 1 stack /proc/pid/smaps
replacing pid with the pid of the process you want.
I think that tells you either how much stack space has actually been used (rounded up to a multiple of 4KB) or a minimum value if very little stack has been used.
If you need more detail for small stack use, change the 1 in that command to 2 and look at the Rss value. For a fairly new process with low stack use on a system that isn't under serious memory load, the Rss value should be the true stack usage rounded up to 4KB multiple, while Size would be the minimum initial mapping.
I only tried that last command on a 64 bit Centos 5 and only on a few processes. So it might need some details changed to handle other distributions.
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