Function t8_shmem_array_prefix(const void *, t8_shmem_array_t, const int, sc_MPI_Datatype, sc_MPI_Op, sc_MPI_Comm)

Function Documentation

void t8_shmem_array_prefix(const void *sendbuf, t8_shmem_array_t recvarray, const int count, sc_MPI_Datatype type, sc_MPI_Op op, sc_MPI_Comm comm)

Fill a t8_shmem array with an Allgather of the prefix operation over all processes.

The receive array will be (0, send0, send0 op send1, send0 op send1 op send2, …)

Note

the first entry of recvarray will be set to 0 using memset. The entry can be changed after calling t8_shmem_array_prefix

Parameters:

  • sendbuf – [in] The source from this process

  • recvarray – [inout] The destination shmem array

  • count – [in] The number of items to gather

  • type – [in] The type of items to gather

  • op – [in] The operation to be used

  • comm – [in] The MPI communicator