575 строки
19 KiB
C
575 строки
19 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University.
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* All rights reserved.
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* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
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* All rights reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include "coll_basic.h"
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#include <stdio.h>
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#include "mpi.h"
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#include "ompi/include/constants.h"
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#include "ompi/mca/coll/coll.h"
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#include "ompi/mca/coll/base/coll_tags.h"
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#include "ompi/op/op.h"
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/*
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* reduce_lin_intra
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*
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* Function: - reduction using O(N) algorithm
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* Accepts: - same as MPI_Reduce()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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mca_coll_basic_reduce_lin_intra(void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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int root, struct ompi_communicator_t *comm)
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{
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int i;
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int rank;
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int err;
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int size;
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long true_lb, true_extent, lb, extent;
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char *free_buffer = NULL;
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char *pml_buffer = NULL;
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char *inplace_temp = NULL;
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char *inbuf;
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/* Initialize */
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rank = ompi_comm_rank(comm);
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size = ompi_comm_size(comm);
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/* If not root, send data to the root. */
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if (rank != root) {
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err = MCA_PML_CALL(send(sbuf, count, dtype, root,
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MCA_COLL_BASE_TAG_REDUCE,
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MCA_PML_BASE_SEND_STANDARD, comm));
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return err;
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}
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/* Root receives and reduces messages. Allocate buffer to receive
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* messages. This comment applies to all collectives in this basic
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* module where we allocate a temporary buffer. For the next few
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* lines of code, it's tremendously complicated how we decided that
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* this was the Right Thing to do. Sit back and enjoy. And prepare
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* to have your mind warped. :-)
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*
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* Recall some definitions (I always get these backwards, so I'm
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* going to put them here):
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*
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* extent: the length from the lower bound to the upper bound -- may
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* be considerably larger than the buffer required to hold the data
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* (or smaller! But it's easiest to think about when it's larger).
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*
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* true extent: the exact number of bytes required to hold the data
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* in the layout pattern in the datatype.
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*
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* For example, consider the following buffer (just talking about
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* LB, extent, and true extent -- extrapolate for UB; i.e., assume
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* the UB equals exactly where the data ends):
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*
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* A B C
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* --------------------------------------------------------
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* | | |
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* --------------------------------------------------------
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*
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* There are multiple cases:
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*
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* 1. A is what we give to MPI_Send (and friends), and A is where
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* the data starts, and C is where the data ends. In this case:
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*
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* - extent: C-A
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* - true extent: C-A
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* - LB: 0
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*
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* A C
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* --------------------------------------------------------
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* | |
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* --------------------------------------------------------
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* <=======================extent=========================>
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* <======================true extent=====================>
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*
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* 2. A is what we give to MPI_Send (and friends), B is where the
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* data starts, and C is where the data ends. In this case:
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*
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* - extent: C-A
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* - true extent: C-B
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* - LB: positive
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*
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* A B C
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* --------------------------------------------------------
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* | | User buffer |
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* --------------------------------------------------------
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* <=======================extent=========================>
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* <===============true extent=============>
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*
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* 3. B is what we give to MPI_Send (and friends), A is where the
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* data starts, and C is where the data ends. In this case:
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*
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* - extent: C-A
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* - true extent: C-A
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* - LB: negative
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*
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* A B C
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* --------------------------------------------------------
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* | | User buffer |
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* --------------------------------------------------------
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* <=======================extent=========================>
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* <======================true extent=====================>
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*
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* 4. MPI_BOTTOM is what we give to MPI_Send (and friends), B is
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* where the data starts, and C is where the data ends. In this
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* case:
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*
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* - extent: C-MPI_BOTTOM
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* - true extent: C-B
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* - LB: [potentially very large] positive
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*
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* MPI_BOTTOM B C
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* --------------------------------------------------------
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* | | User buffer |
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* --------------------------------------------------------
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* <=======================extent=========================>
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* <===============true extent=============>
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*
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* So in all cases, for a temporary buffer, all we need to malloc()
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* is a buffer of size true_extent. We therefore need to know two
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* pointer values: what value to give to MPI_Send (and friends) and
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* what value to give to free(), because they might not be the same.
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*
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* Clearly, what we give to free() is exactly what was returned from
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* malloc(). That part is easy. :-)
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*
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* What we give to MPI_Send (and friends) is a bit more complicated.
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* Let's take the 4 cases from above:
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*
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* 1. If A is what we give to MPI_Send and A is where the data
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* starts, then clearly we give to MPI_Send what we got back from
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* malloc().
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*
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* 2. If B is what we get back from malloc, but we give A to
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* MPI_Send, then the buffer range [A,B) represents "dead space"
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* -- no data will be put there. So it's safe to give B-LB to
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* MPI_Send. More specifically, the LB is positive, so B-LB is
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* actually A.
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*
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* 3. If A is what we get back from malloc, and B is what we give to
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* MPI_Send, then the LB is negative, so A-LB will actually equal
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* B.
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*
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* 4. Although this seems like the weirdest case, it's actually
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* quite similar to case #2 -- the pointer we give to MPI_Send is
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* smaller than the pointer we got back from malloc().
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*
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* Hence, in all cases, we give (return_from_malloc - LB) to MPI_Send.
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*
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* This works fine and dandy if we only have (count==1), which we
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* rarely do. ;-) So we really need to allocate (true_extent +
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* ((count - 1) * extent)) to get enough space for the rest. This may
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* be more than is necessary, but it's ok.
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*
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* Simple, no? :-)
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*
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*/
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ompi_ddt_get_extent(dtype, &lb, &extent);
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ompi_ddt_get_true_extent(dtype, &true_lb, &true_extent);
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if (MPI_IN_PLACE == sbuf) {
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sbuf = rbuf;
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inplace_temp = malloc(true_extent + (count - 1) * extent);
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if (NULL == inplace_temp) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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rbuf = inplace_temp - lb;
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}
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if (size > 1) {
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free_buffer = malloc(true_extent + (count - 1) * extent);
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if (NULL == free_buffer) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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pml_buffer = free_buffer - lb;
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}
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/* Initialize the receive buffer. */
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if (rank == (size - 1)) {
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err = ompi_ddt_copy_content_same_ddt(dtype, count, rbuf, sbuf);
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} else {
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err = MCA_PML_CALL(recv(rbuf, count, dtype, size - 1,
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MCA_COLL_BASE_TAG_REDUCE, comm,
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MPI_STATUS_IGNORE));
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}
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if (MPI_SUCCESS != err) {
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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return err;
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}
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/* Loop receiving and calling reduction function (C or Fortran). */
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for (i = size - 2; i >= 0; --i) {
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if (rank == i) {
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inbuf = sbuf;
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} else {
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err = MCA_PML_CALL(recv(pml_buffer, count, dtype, i,
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MCA_COLL_BASE_TAG_REDUCE, comm,
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MPI_STATUS_IGNORE));
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if (MPI_SUCCESS != err) {
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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return err;
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}
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inbuf = pml_buffer;
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}
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/* Perform the reduction */
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ompi_op_reduce(op, inbuf, rbuf, count, dtype);
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}
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if (NULL != inplace_temp) {
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err = ompi_ddt_copy_content_same_ddt(dtype, count, sbuf, inplace_temp);
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free(inplace_temp);
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}
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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/* All done */
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return MPI_SUCCESS;
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}
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/*
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* reduce_log_intra
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*
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* Function: - reduction using O(log N) algorithm
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* Accepts: - same as MPI_Reduce()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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mca_coll_basic_reduce_log_intra(void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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int root, struct ompi_communicator_t *comm)
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{
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int i;
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int size;
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int rank;
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int vrank;
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int err;
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int peer;
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int dim;
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int mask;
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long true_lb, true_extent, lb, extent;
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char *free_buffer = NULL;
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char *free_rbuf = NULL;
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char *pml_buffer = NULL;
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char *snd_buffer = sbuf;
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char *rcv_buffer = rbuf;
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char *inplace_temp = NULL;
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/* JMS Codearound for now -- if the operations is not communative,
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* just call the linear algorithm. Need to talk to Edgar / George
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* about fixing this algorithm here to work with non-communative
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* operations. */
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if (!ompi_op_is_commute(op)) {
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return mca_coll_basic_reduce_lin_intra(sbuf, rbuf, count, dtype,
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op, root, comm);
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}
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/* Some variables */
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size = ompi_comm_size(comm);
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rank = ompi_comm_rank(comm);
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vrank = ompi_op_is_commute(op) ? (rank - root + size) % size : rank;
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dim = comm->c_cube_dim;
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/* Allocate the incoming and resulting message buffers. See lengthy
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* rationale above. */
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ompi_ddt_get_extent(dtype, &lb, &extent);
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ompi_ddt_get_true_extent(dtype, &true_lb, &true_extent);
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free_buffer = malloc(true_extent + (count - 1) * extent);
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if (NULL == free_buffer) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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pml_buffer = free_buffer - lb;
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/* read the comment about commutative operations (few lines down
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* the page) */
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if (ompi_op_is_commute(op)) {
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rcv_buffer = pml_buffer;
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}
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/* Allocate sendbuf in case the MPI_IN_PLACE option has been used. See lengthy
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* rationale above. */
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if (MPI_IN_PLACE == sbuf) {
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inplace_temp = malloc(true_extent + (count - 1) * extent);
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if (NULL == inplace_temp) {
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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sbuf = inplace_temp - lb;
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err = ompi_ddt_copy_content_same_ddt(dtype, count, rbuf, sbuf);
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}
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if (rank != root && 0 == (vrank & 1)) {
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/* root is the only one required to provide a valid rbuf.
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* Assume rbuf is invalid for all other ranks, so fix it up
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* here to be valid on all non-leaf ranks */
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free_rbuf = malloc(true_extent + (count - 1) * extent);
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if (NULL == free_rbuf) {
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free(free_buffer);
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return OMPI_ERR_OUT_OF_RESOURCE;
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}
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rbuf = free_rbuf - lb;
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}
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/* Loop over cube dimensions. High processes send to low ones in the
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* dimension. */
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for (i = 0, mask = 1; i < dim; ++i, mask <<= 1) {
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/* A high-proc sends to low-proc and stops. */
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if (vrank & mask) {
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peer = vrank & ~mask;
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if (ompi_op_is_commute(op)) {
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peer = (peer + root) % size;
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}
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err = MCA_PML_CALL(send(snd_buffer, count,
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dtype, peer, MCA_COLL_BASE_TAG_REDUCE,
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MCA_PML_BASE_SEND_STANDARD, comm));
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if (MPI_SUCCESS != err) {
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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if (NULL != free_rbuf) {
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free(free_rbuf);
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}
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return err;
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}
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snd_buffer = rbuf;
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break;
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}
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/* A low-proc receives, reduces, and moves to a higher
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* dimension. */
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else {
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peer = vrank | mask;
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if (peer >= size) {
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continue;
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}
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if (ompi_op_is_commute(op)) {
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peer = (peer + root) % size;
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}
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/* Most of the time (all except the first one for commutative
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* operations) we receive in the user provided buffer
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* (rbuf). But the exception is here to allow us to dont have
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* to copy from the sbuf to a temporary location. If the
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* operation is commutative we dont care in which order we
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* apply the operation, so for the first time we can receive
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* the data in the pml_buffer and then apply to operation
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* between this buffer and the user provided data. */
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err = MCA_PML_CALL(recv(rcv_buffer, count, dtype, peer,
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MCA_COLL_BASE_TAG_REDUCE, comm,
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MPI_STATUS_IGNORE));
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if (MPI_SUCCESS != err) {
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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if (NULL != free_rbuf) {
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free(free_rbuf);
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}
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return err;
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}
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/* Perform the operation. The target is always the user
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* provided buffer We do the operation only if we receive it
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* not in the user buffer */
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if (snd_buffer != sbuf) {
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/* the target buffer is the locally allocated one */
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ompi_op_reduce(op, rcv_buffer, pml_buffer, count, dtype);
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} else {
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/* If we're commutative, we don't care about the order of
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* operations and we can just reduce the operations now.
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* If we are not commutative, we have to copy the send
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* buffer into a temp buffer (pml_buffer) and then reduce
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* what we just received against it. */
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if (!ompi_op_is_commute(op)) {
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ompi_ddt_copy_content_same_ddt(dtype, count, pml_buffer,
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sbuf);
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ompi_op_reduce(op, rbuf, pml_buffer, count, dtype);
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} else {
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ompi_op_reduce(op, sbuf, pml_buffer, count, dtype);
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}
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/* now we have to send the buffer containing the computed data */
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snd_buffer = pml_buffer;
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/* starting from now we always receive in the user
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* provided buffer */
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rcv_buffer = rbuf;
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}
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}
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}
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/* Get the result to the root if needed. */
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err = MPI_SUCCESS;
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if (0 == vrank) {
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if (root == rank) {
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ompi_ddt_copy_content_same_ddt(dtype, count, rbuf, snd_buffer);
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} else {
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err = MCA_PML_CALL(send(snd_buffer, count,
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dtype, root, MCA_COLL_BASE_TAG_REDUCE,
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MCA_PML_BASE_SEND_STANDARD, comm));
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}
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} else if (rank == root) {
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err = MCA_PML_CALL(recv(rcv_buffer, count, dtype, 0,
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MCA_COLL_BASE_TAG_REDUCE,
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comm, MPI_STATUS_IGNORE));
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if (rcv_buffer != rbuf) {
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ompi_op_reduce(op, rcv_buffer, rbuf, count, dtype);
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}
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}
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if (NULL != inplace_temp) {
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free(inplace_temp);
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}
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if (NULL != free_buffer) {
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free(free_buffer);
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}
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if (NULL != free_rbuf) {
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free(free_rbuf);
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}
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/* All done */
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return err;
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}
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/*
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* reduce_lin_inter
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*
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* Function: - reduction using O(N) algorithm
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* Accepts: - same as MPI_Reduce()
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* Returns: - MPI_SUCCESS or error code
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*/
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int
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mca_coll_basic_reduce_lin_inter(void *sbuf, void *rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op,
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int root, struct ompi_communicator_t *comm)
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{
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int i;
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int rank;
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int err;
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int size;
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long true_lb, true_extent, lb, extent;
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char *free_buffer = NULL;
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char *pml_buffer = NULL;
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/* Initialize */
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rank = ompi_comm_rank(comm);
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size = ompi_comm_remote_size(comm);
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if (MPI_PROC_NULL == root) {
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/* do nothing */
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err = OMPI_SUCCESS;
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} else if (MPI_ROOT != root) {
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/* If not root, send data to the root. */
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err = MCA_PML_CALL(send(sbuf, count, dtype, root,
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MCA_COLL_BASE_TAG_REDUCE,
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MCA_PML_BASE_SEND_STANDARD, comm));
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} else {
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/* Root receives and reduces messages */
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ompi_ddt_get_extent(dtype, &lb, &extent);
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ompi_ddt_get_true_extent(dtype, &true_lb, &true_extent);
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|
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free_buffer = malloc(true_extent + (count - 1) * extent);
|
|
if (NULL == free_buffer) {
|
|
return OMPI_ERR_OUT_OF_RESOURCE;
|
|
}
|
|
pml_buffer = free_buffer - lb;
|
|
|
|
|
|
/* Initialize the receive buffer. */
|
|
err = MCA_PML_CALL(recv(rbuf, count, dtype, 0,
|
|
MCA_COLL_BASE_TAG_REDUCE, comm,
|
|
MPI_STATUS_IGNORE));
|
|
if (MPI_SUCCESS != err) {
|
|
if (NULL != free_buffer) {
|
|
free(free_buffer);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/* Loop receiving and calling reduction function (C or Fortran). */
|
|
for (i = 1; i < size; i++) {
|
|
err = MCA_PML_CALL(recv(pml_buffer, count, dtype, i,
|
|
MCA_COLL_BASE_TAG_REDUCE, comm,
|
|
MPI_STATUS_IGNORE));
|
|
if (MPI_SUCCESS != err) {
|
|
if (NULL != free_buffer) {
|
|
free(free_buffer);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/* Perform the reduction */
|
|
ompi_op_reduce(op, pml_buffer, rbuf, count, dtype);
|
|
}
|
|
|
|
if (NULL != free_buffer) {
|
|
free(free_buffer);
|
|
}
|
|
}
|
|
|
|
/* All done */
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* reduce_log_inter
|
|
*
|
|
* Function: - reduction using O(N) algorithm
|
|
* Accepts: - same as MPI_Reduce()
|
|
* Returns: - MPI_SUCCESS or error code
|
|
*/
|
|
int
|
|
mca_coll_basic_reduce_log_inter(void *sbuf, void *rbuf, int count,
|
|
struct ompi_datatype_t *dtype,
|
|
struct ompi_op_t *op,
|
|
int root, struct ompi_communicator_t *comm)
|
|
{
|
|
return OMPI_ERR_NOT_IMPLEMENTED;
|
|
}
|