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Use MPI_Comm_dup to separate ArborX comm context from user's #135

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Oct 9, 2019
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Use MPI_Comm_dup to separate ArborX comm context from user's #135

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489e973
Use MPI_Comm_dup to separate ArborX comm context from user's
aprokop Oct 9, 2019
3b8b63b
Fix forgotten communicator release
aprokop Oct 9, 2019
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Use MPI_Comm_dup to separate ArborX comm context from user's 
This call should normally not involve any communication.
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@aprokop
aprokop committed Oct 9, 2019
commit 489e973a7104a465b8e09c8b533e1666621da8d5
5 changes: 3 additions & 2 deletions src/ArborX_DistributedSearchTree.hpp
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Expand Up @@ -105,9 +105,10 @@ template <typename DeviceType>
template <typename Primitives>
DistributedSearchTree<DeviceType>::DistributedSearchTree(
MPI_Comm comm, Primitives const &primitives)
: _comm(comm)
, _bottom_tree(primitives)
: _bottom_tree(primitives)
{
MPI_Comm_dup(comm, &_comm);
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You need to comment about the duplication. I do not understand what is different from copying since it duplicate the attributes of the original communicator.

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Copying communicator does not create new context. Duplicating does. Having a different context means that the messages sent by user cannot be received by the library and vice versa, even if they have the exact same information and tags.

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Add a comment in the code.


int comm_rank;
MPI_Comm_rank(_comm, &comm_rank);
int comm_size;
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