Per MPI-3.1:8.7.1 p361:11-13, it's valid for MPI_FINALIZED to be
invoked during an attribute destruction callback (e.g., during the
destruction of keyvals on MPI_COMM_SELF during the very beginning of
MPI_FINALIZE). In such cases, MPI_FINALIZED must return "false".
Prior to this commit, we hung in FINALIZED if it were invoked during
a COMM_SELF attribute destruction callback in FINALIZE. See
https://github.com/open-mpi/ompi/issues/5084.
This commit converts the MPI_INITIALIZED / MPI_FINALIZED
infrastructure to use a single enum (ompi_mpi_state, set atomically)
to represent the state of MPI:
- not initialized
- init started
- init completed
- finalize started
- finalize past COMM_SELF destruction
- finalize completed
The "finalize past COMM_SELF destruction" state is what allows us to
return "false" from MPI_FINALIZED before COMM_SELF has been fully
destroyed / all attribute callbacks have been invoked.
Since this state is checked at nearly every MPI API call (to see if
we're outside of the INIT/FINALIZE epoch), care was taken to use
atomics to *set* the ompi_mpi_state value in ompi_mpi_init() and
ompi_mpi_finalize(), but performance-critical code paths can simply
read the variable without needing to use a slow call to an
opal_atomic_*() function.
Thanks to @AndrewGaspar for reporting the issue.
Signed-off-by: Jeff Squyres <jsquyres@cisco.com>
FCA barrier may not complete if FCA progress is not called periodically.
PMI/PMI2 API that can be used in rte barrier has no provision for calling
external progress function.
So it is possible that during finalize some ranks will be stuck
in fca barrier while others are in PMI barrier.
This merges the branch containing the revamped build system based around converting autogen from a bash script to a Perl program. Jeff has provided emails explaining the features contained in the change.
Please note that configure requirements on components HAVE CHANGED. For example. a configure.params file is no longer required in each component directory. See Jeff's emails for an explanation.
This commit was SVN r23764.
* change comm_init API - no need to pass local rank groups, fca calculates that on its own.
* remove local rank list from module - libfca maintains that now.
* in fca_bcast and fca_reduce - pass root rank index and let libfca figure out the local rank index.
This commit was SVN r23716.
* fixup lookup of supported ops by name:
in ompi 1.5.x the op string representation were changed from MPI_XXX to MPI_OP_XXX (relative to OMPI 1.4.x)
* keep compat between diff versions of FCA
* better error handling (return error if symbol not found)
* register to opal_progress and call fca_progress API
This commit was SVN r23597.
