Err. MPI_Comm_remote_size.
> 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
>> _______________________________________________
>> users mailing list
>> users@lists.open-mpi.org
>> https://lists.open-mpi.org/mailman/listinfo/users
_______________________________________________
users mailing list
users@lists.open-mpi.org
https://lists.open-mpi.org/mailman/listinfo/users
