from the ROMIO sources :
/* Any MPI implementation that wishes to follow the thread-safety and
error reporting features provided by MPICH must implement these
four functions. Defining these as empty should not change the behavior
of correct programs */
the MPIO_DATATYPE_ISCOMMITTED macro now always set err_=0
this is an optimistic approach for Open MPI, but it is likely other upper
layers already checked the datatype was committed.
not setting err_ is incorrect since it can lead to some use of uninitialized
variable.
Fixesopen-mpi/ompi#404
Also include two other minor changes:
1. More C99-style member initialization in the component struct
1. Fix the BTL module member initialization to not be redundant
Due to the nature of the cache architecture on power,
we don't export coherency_line_size for L2 in sysfs.
If we are unable to get the L2 cache line size, try L1.
See open-mpi/ompi#383 for more information.
If the free list initialization fails in libnbc_open()
mca_coll_libnbc_component.active_requests remain uninitialized,
resulting in a crash while closing the component
In order to have an effect, ibv_fork_init should be called in the
beginning of the verbs initialization flow - before the calls to the
ibv_create_qp and ibv_create_cq verbs.
These functions are called from the oob/ud code and by the time the
other verbs components (btl openib, pml yalla, ...) call ibv_fork_init,
it's too late. This commit forces the call to ibv_fork_init (if it's
requested) right at the beginning of all the components that are using
verbs.
(ibv_fork_init() can be safely called multiple times)
This commit also removes the btl_openib_want_fork_support mca parameter
and adds a new mca parameter instead - opal_verbs_want_fork_support.
Through this new parameter, fork support may be requested for ALL
components.
The default value for this parameter is set to 1.
Before this commit the btl_openib_want_fork_support parameter didn't
provide fork support for the openib btl if its value was set to 1.
(because when openib called ibv_fork_init, it was already after the
calls to ibv_create_* in oob/ud and thereofre it failed).