[mpich-devel] proposed changes to function enter/exit logging

Jeff Hammond jeff.science at gmail.com
Wed Nov 6 18:22:29 CST 2019

Do you have a list of what compilers support this?  Is this just GCC, just
GCC and Clang, or a bigger list?  If Clang supports it, do you know if all
of the Clang derivatives (e.g. IBM XLC) support it?



On Wed, Nov 6, 2019 at 2:04 PM Raffenetti, Kenneth J. via devel <
devel at mpich.org> wrote:

> Folks,
> I want to draw attention to a pull request posted to the MPICH github.
>    https://github.com/pmodels/mpich/pull/4139
> This proposes to remove all MPIR_FUNC_VERBOSE_ENTER and
> MPIR_FUNC_VERBOSE_EXIT macros from MPICH and instead use compiler
> function instrumentation when configured for debug logging:
> https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html.
> There are 2 main benefits:
> 1. De-clutter the code. PR stats show a net deletion of >10,000 lines!
> 2. Less error-prone. The compiler will reliably instrument *all*
> functions, and will not suffer from copy/paste errors or typos.
> Drawbacks:
> 1. Requires compiler support for instrumentation. May affect users
> debugging certain compiler configurations.
> 2. Compiler function instrumentation logs function addresses, not
> symbols. An additional step is needed to convert addresses to function
> names via script (included in PR).
> What do people think? Will these changes affect anyone using debug
> logging in any regular capacity? We're looking for feedback good or bad.
> Let us know.
> Thanks,
> Ken
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Jeff Hammond
jeff.science at gmail.com
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