Function t8_shmem_array_allgatherv

Function Documentation

void t8_shmem_array_allgatherv(void *sendbuf, const int sendcount, sc_MPI_Datatype sendtype, t8_shmem_array_t recvarray, sc_MPI_Datatype recvtype, sc_MPI_Comm comm)

Fill a t8_shmem array with an Allgatherv Computes the recvcount-array and displacement-array for each rank of a node using the sendcount.

The total number of items of each node is then used to compute the recvcount-array and displacement-array between nodes. Use t8_shmem_array_allgather if the sendcount is equal on all procs for better scaling.

Parameters:

  • sendbuf – [in] the source from this process

  • sendcount – [in] the number of items to gather on this proc

  • sendtype – [in] the type of items to gather

  • recvarray – [inout] array of type recvtype where the data gets written to

  • recvtype – [in] the type of items to receive

  • comm – [in] the mpi communicator