Re: [Valgrind-users] measuring stack usage

[Bart V. A. <bar...@gm...>]

On Fri, Mar 28, 2008 at 8:34 PM, Dirk Stoecker <val...@ds...> wrote:
> On Fri, 28 Mar 2008, bar...@gm... wrote:
>
>  >> P.S. Is there a tool telling me stack usage for threads (I use Linux).
>  >
>  > Is it sufficient if stack usage is reported for all threads at the
>  > time a process terminates ? I can add such functionality easily to
>  > exp-drd if you want.
>
>  Actually I want to know the maximum stack size a thread used. Because I
>  need to set the maximum stack size to a defined value and currently this
>  is based on guessing+some security margin. And this is never a good way.
>  Measurement+security margin would be much better.

By this time I have added a command-line option --show-stack-usage to
exp-drd. If enabled it is reported how many bytes a thread has used on
its stack at the time it finished. An example:

$ ./vg-in-place --tool=exp-drd --show-stack-usage=yes
exp-drd/tests/matinv 200 -t4
==30241== exp-drd, a data race detector.
==30241== NOTE: This is an Experimental-Class Valgrind Tool.
==30241== Copyright (C) 2006-2008, and GNU GPL'd, by Bart Van Assche.
==30241== Using LibVEX rev 1811, a library for dynamic binary translation.
==30241== Copyright (C) 2004-2008, and GNU GPL'd, by OpenWorks LLP.
==30241== Using valgrind-3.4.0.SVN, a dynamic binary instrumentation framework.
==30241== Copyright (C) 2000-2008, and GNU GPL'd, by Julian Seward et al.
==30241== For more details, rerun with: -v
==30241==
==30241== thread 2/2 finished and used 4776 bytes out of 28672 on its
stack. Margin: 23896 bytes.
==30241== thread 3/3 finished and used 4280 bytes out of 28672 on its
stack. Margin: 24392 bytes.
==30241== thread 4/4 finished and used 4280 bytes out of 28672 on its
stack. Margin: 24392 bytes.
==30241== thread 5/5 finished and used 4280 bytes out of 28672 on its
stack. Margin: 24392 bytes.
error = 1.08926e-16; epsilon = 2.22045e-16; error / (epsilon * n) = 0.00490557
Error within bounds.
==30241== thread 1/1 finished and used 8992 bytes out of 8388608 on
its stack. Margin: 8379616 bytes.
==30241==
==30241== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 32 from 1)

You can run the exp-drd tool by building the latest Valgrind SVN
sources. For instructions, see also
http://www.valgrind.org/downloads/repository.html

Bart.