[Mpi-forum] Communicator info arguments
balaji at mcs.anl.gov
Fri Dec 7 16:04:59 CST 2012
My question was for the other communicator creation functions.
Specifically, Comm_split in my query below.
On 12/07/2012 04:01 PM US Central Time, Jeff Hammond wrote:
>>From MPI-3 6.4.2 (MPI_COMM_DUP):
> "MPI_COMM_DUP duplicates the existing communicator comm with the
> associated key values, topology information and info hints."
> "MPI_COMM_DUP_WITH_INFO behaves exactly as MPI_COMM_DUP except that
> the info hints associated with the communicator comm are not
> duplicated in newcomm. The hints provided by the arguments info are
> associated with the output communicator newcomm instead."
> On Fri, Dec 7, 2012 at 3:56 PM, Pavan Balaji <balaji at mcs.anl.gov> wrote:
>> Apologies if this query needs to go a specific working group. I wasn't
>> sure which one, so I'm sending it to the overall mailing list.
>> If a communicator is created using MPI_COMM_DUP_WITH_INFO, is the info
>> argument "sticky" to all child communicators? That is, if I split the
>> output communicator further, will the info argument propagate?
>> Adam said that it would, at the Forum, but that doesn't seem accurate,
>> since that'll get weird if I do an Intercomm_merge with two
>> communicators, one of which has an info argument and the second does not.
>> I couldn't find text saying one way or another in the document.
>> -- Pavan
>> Pavan Balaji
>> mpi-forum mailing list
>> mpi-forum at lists.mpi-forum.org
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