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Subject: Re: [OMPI devel] RFC: Add an __attribute__((destructor)) function to opal
From: Nathan Hjelm (hjelmn_at_[hidden])
Date: 2014-07-16 11:07:42


On Wed, Jul 16, 2014 at 07:59:14AM -0700, Ralph Castain wrote:
> I discussed this over IM with Nathan to try and get a better understanding of the options. Basically, we have two approaches available to us:
>
> 1. my solution resolves the segv problem and eliminates leaks so long as the user calls MPI_Init/Finalize after calling the MPI_T init/finalize functions. This method will still leak memory if the user doesn't use MPI after calling the MPI_T functions, but does mean that all memory used by MPI will be released upon MPI_Finalize. So if the user program continues beyond MPI, they won't be carrying the MPI memory footprint with them. This continues our current behavior.
>
> 2. the destructor method, which release the MPI memory footprint upon final program termination instead of at MPI_Finalize. This also solves the segv and leak problems, and ensures that someone calling only the MPI_T init/finalize functions will be valgrind-clean, but means that a user program that runs beyond MPI will carry the MPI memory footprint with them. This is a change in our current behavior.

Correct. Though the only thing we will carry around until termination is
the memory associated with opal/mca/if, opal/mca/event, opal_net,
opal_malloc, opal_show_help, opal_output, opal_dss, opal_datatype, and
opal_class. Not sure how much memory this is.

-Nathan



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