Am 13.04.2018 um 15:41 schrieb Nathan Hjelm:
> Err. MPI_Comm_remote_size.
Ah, thanks! I thought at that MPI_Comm_size returns the number of remote ranks.
remote_size returns 1, so now at least
the error message is consistent.
Best,
Florian
>
>> On Apr 13, 2018, at 7:41 AM, Nathan Hjelm <hje...@me.com> wrote:
>>
>> Try using MPI_Comm_remotr_size. As this is an intercommunicator that will
>> give the number of ranks for send/recv.
>>
>>> On Apr 13, 2018, at 7:34 AM, Florian Lindner <mailingli...@xgm.de> wrote:
>>>
>>> Hello,
>>>
>>> I have this piece of code
>>>
>>> PtrRequest MPICommunication::aSend(double *itemsToSend, int size, int
>>> rankReceiver)
>>> {
>>> rankReceiver = rankReceiver - _rankOffset;
>>> int comsize = -1;
>>> MPI_Comm_size(communicator(rankReceiver), &comsize);
>>> TRACE(size, rank(rankReceiver), comsize);
>>>
>>>
>>> MPI_Request request;
>>> MPI_Isend(itemsToSend,
>>> size,
>>> MPI_DOUBLE,
>>> rank(rankReceiver),
>>> 0,
>>> communicator(rankReceiver),
>>> &request);
>>>
>>> return PtrRequest(new MPIRequest(request));
>>> }
>>>
>>> While there are quite some calls you don't know, it's basically a wrapper
>>> around Isend.
>>>
>>> The communicator returned by communicator(rankReceiver) is an
>>> inter-communicator!
>>>
>>> The TRACE call prints:
>>>
>>> [1,1]<stdout>:(1) 14:30:04 [com::MPICommunication]:104 in aSend: Entering
>>> aSend
>>> [1,1]<stdout>: Argument 0: size == 50
>>> [1,1]<stdout>: Argument 1: rank(rankReceiver) == 1
>>> [1,1]<stdout>: Argument 2: comsize == 2
>>> [1,0]<stdout>:(0) 14:30:04 [com::MPICommunication]:104 in aSend: Entering
>>> aSend
>>> [1,0]<stdout>: Argument 0: size == 48
>>> [1,0]<stdout>: Argument 1: rank(rankReceiver) == 0
>>> [1,0]<stdout>: Argument 2: comsize == 2
>>>
>>> So, on rank 1 we send to rank = 1 on a communicator with size = 2.
>>>
>>> Still, rank 1 crashes with:
>>>
>>> [neon:80361] *** An error occurred in MPI_Isend
>>> [neon:80361] *** reported by process [1052966913,1]
>>> [neon:80361] *** on communicator
>>> [neon:80361] *** MPI_ERR_RANK: invalid rank
>>> [neon:80361] *** MPI_ERRORS_ARE_FATAL (processes in this communicator will
>>> now abort,
>>> [neon:80361] *** and potentially your MPI job)
>>>
>>> your collegues from mpich print
>>>
>>> [1] Fatal error in PMPI_Isend: Invalid rank, error stack:
>>> [1] PMPI_Isend(149): MPI_Isend(buf=0x560ddeb02100, count=49, MPI_DOUBLE,
>>> dest=1, tag=0, comm=0x84000005,
>>> request=0x7ffd528989c0) failed
>>> [1] PMPI_Isend(97).: Invalid rank has value 1 but must be nonnegative and
>>> less than 1
>>>
>>> [0] Fatal error in PMPI_Isend: Invalid rank, error stack:
>>> [0] PMPI_Isend(149): MPI_Isend(buf=0x564b74c9edd8, count=1, MPI_DOUBLE,
>>> dest=1, tag=0, comm=0x84000006,
>>> request=0x7ffe5848d9f0) failed
>>> [0] PMPI_Isend(97).: Invalid rank has value 1 but must be nonnegative and
>>> less than 1
>>>
>>> but MPI_Comm_size also returns 2.
>>>
>>> Do you have any idea where to look to find out what is going wrong here?
>>> Esp. with the communicator being an inter-com.
>>>
>>> Best Thanks,
>>> Florian
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