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? Thanks, Jeff On Wed, Nov 6, 2019 at 2:04 PM Raffenetti, Kenneth J. via devel < [email protected]> 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 _______________________________________________ To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/devel

-- Jeff Hammond [email protected] http://jeffhammond.github.io/