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coll: define fallback algorithms
They are manual "auto" algorithms that selects from a small set of algorithms that are suitable for internal usages, e.g. during init, finalize, and communicator constructions.
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3 files changed

+91
-10
lines changed

3 files changed

+91
-10
lines changed

‎src/include/mpir_coll.h‎

Lines changed: 19 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -11,17 +11,26 @@
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/* During init, not all algorithms are safe to use. For example, the csel
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* may not have been initialized. We define a set of fallback routines that
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* are safe to use during init. They are all intra algorithms.
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* are safe to use during init.
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*/
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#define MPIR_Barrier_fallback MPIR_Barrier_intra_dissemination
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#define MPIR_Allgather_fallback MPIR_Allgather_intra_brucks
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#define MPIR_Allgatherv_fallback MPIR_Allgatherv_intra_brucks
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#define MPIR_Allreduce_fallback MPIR_Allreduce_intra_recursive_doubling
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#define MPIR_Bcast_fallback MPIR_Bcast_intra_binomial
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#define MPIR_Gather_fallback MPIR_Gather_intra_binomial
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#define MPIR_Reduce_scatter_block_fallback MPIR_Reduce_scatter_block_intra_recursive_doubling
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/* used in MPIR_Comm_split_impl */
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#define MPIR_Allgather_inter_fallback MPIR_Allgather_inter_local_gather_remote_bcast
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int MPIR_Barrier_fallback(MPIR_Comm * comm_ptr, int coll_attr);
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int MPIR_Allgather_fallback(const void *sendbuf, MPI_Aint sendcount, MPI_Datatype sendtype,
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void *recvbuf, MPI_Aint recvcount, MPI_Datatype recvtype,
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MPIR_Comm * comm_ptr, int coll_attr);
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int MPIR_Allgatherv_fallback(const void *sendbuf, MPI_Aint sendcount, MPI_Datatype sendtype,
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void *recvbuf, const MPI_Aint * recvcounts, const MPI_Aint * displs,
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MPI_Datatype recvtype, MPIR_Comm * comm_ptr, int coll_attr);
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int MPIR_Allreduce_fallback(const void *sendbuf, void *recvbuf,
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MPI_Aint count, MPI_Datatype datatype,
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MPI_Op op, MPIR_Comm * comm_ptr, int coll_attr);
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int MPIR_Bcast_fallback(void *buffer, MPI_Aint count, MPI_Datatype datatype, int root,
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MPIR_Comm * comm_ptr, int coll_attr);
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int MPIR_Gather_fallback(const void *sendbuf, MPI_Aint sendcount, MPI_Datatype sendtype,
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void *recvbuf, MPI_Aint recvcount, MPI_Datatype recvtype, int root,
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MPIR_Comm * comm_ptr, int coll_attr);
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int MPIR_Reduce_scatter_block_fallback(const void *sendbuf, void *recvbuf, MPI_Aint recvcount,
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MPI_Datatype datatype, MPI_Op op,
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MPIR_Comm * comm_ptr, int coll_attr);
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/* Internal point-to-point communication for collectives */

‎src/mpi/coll/src/Makefile.mk‎

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -9,6 +9,7 @@
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mpi_core_sources += \
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src/mpi/coll/src/coll_impl.c \
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src/mpi/coll/src/coll_fallback.c \
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src/mpi/coll/src/csel.c \
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src/mpi/coll/src/csel_container.c \
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src/mpi/coll/src/csel_json_autogen.c

‎src/mpi/coll/src/coll_fallback.c‎

Lines changed: 71 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,71 @@
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/*
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* Copyright (C) by Argonne National Laboratory
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* See COPYRIGHT in top-level directory
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*/
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#include "mpiimpl.h"
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#include "coll_impl.h"
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int MPIR_Barrier_fallback(MPIR_Comm * comm_ptr, int coll_attr)
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{
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MPIR_Assert(comm_ptr->comm_kind == MPIR_COMM_KIND__INTRACOMM);
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return MPIR_Barrier_intra_dissemination(comm_ptr, coll_attr);
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}
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int MPIR_Allgather_fallback(const void *sendbuf, MPI_Aint sendcount, MPI_Datatype sendtype,
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void *recvbuf, MPI_Aint recvcount, MPI_Datatype recvtype,
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MPIR_Comm * comm_ptr, int coll_attr)
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{
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if (comm_ptr->comm_kind == MPIR_COMM_KIND__INTRACOMM) {
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return MPIR_Allgather_intra_brucks(sendbuf, sendcount, sendtype,
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recvbuf, recvcount, recvtype, comm_ptr, coll_attr);
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} else {
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return MPIR_Allgather_inter_local_gather_remote_bcast(sendbuf, sendcount, sendtype,
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recvbuf, recvcount, recvtype,
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comm_ptr, coll_attr);
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}
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}
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int MPIR_Allgatherv_fallback(const void *sendbuf, MPI_Aint sendcount, MPI_Datatype sendtype,
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void *recvbuf, const MPI_Aint * recvcounts, const MPI_Aint * displs,
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MPI_Datatype recvtype, MPIR_Comm * comm_ptr, int coll_attr)
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{
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MPIR_Assert(comm_ptr->comm_kind == MPIR_COMM_KIND__INTRACOMM);
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return MPIR_Allgatherv_intra_brucks(sendbuf, sendcount, sendtype,
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recvbuf, recvcounts, displs, recvtype, comm_ptr, coll_attr);
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}
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int MPIR_Allreduce_fallback(const void *sendbuf, void *recvbuf,
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MPI_Aint count, MPI_Datatype datatype,
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MPI_Op op, MPIR_Comm * comm_ptr, int coll_attr)
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{
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MPIR_Assert(comm_ptr->comm_kind == MPIR_COMM_KIND__INTRACOMM);
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return MPIR_Allreduce_intra_recursive_doubling(sendbuf, recvbuf, count, datatype, op,
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comm_ptr, coll_attr);
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}
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int MPIR_Bcast_fallback(void *buffer, MPI_Aint count, MPI_Datatype datatype, int root,
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MPIR_Comm * comm_ptr, int coll_attr)
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{
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MPIR_Assert(comm_ptr->comm_kind == MPIR_COMM_KIND__INTRACOMM);
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return MPIR_Bcast_intra_binomial(buffer, count, datatype, root, comm_ptr, coll_attr);
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}
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int MPIR_Gather_fallback(const void *sendbuf, MPI_Aint sendcount, MPI_Datatype sendtype,
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void *recvbuf, MPI_Aint recvcount, MPI_Datatype recvtype, int root,
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MPIR_Comm * comm_ptr, int coll_attr)
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{
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MPIR_Assert(comm_ptr->comm_kind == MPIR_COMM_KIND__INTRACOMM);
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return MPIR_Gather_intra_binomial(sendbuf, sendcount, sendtype,
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recvbuf, recvcount, recvtype, root, comm_ptr, coll_attr);
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}
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int MPIR_Reduce_scatter_block_fallback(const void *sendbuf, void *recvbuf, MPI_Aint recvcount,
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MPI_Datatype datatype, MPI_Op op,
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MPIR_Comm * comm_ptr, int coll_attr)
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{
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MPIR_Assert(comm_ptr->comm_kind == MPIR_COMM_KIND__INTRACOMM);
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MPIR_Assert(MPIR_Op_is_commutative(op));
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return MPIR_Reduce_scatter_block_intra_recursive_halving(sendbuf, recvbuf, recvcount, datatype,
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op, comm_ptr, coll_attr);
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}

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