540 строки
22 KiB
C
540 строки
22 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* 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 "mpi.h"
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#include "ompi/include/constants.h"
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#include "datatype/datatype.h"
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#include "communicator/communicator.h"
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#include "mca/coll/coll.h"
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#include "mca/coll/base/coll_tags.h"
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#include "mca/pml/pml.h"
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#include "op/op.h"
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#include "coll_tuned.h"
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#include "coll_tuned_topo.h"
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#include <sys/types.h>
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#include <unistd.h>
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/* temp debug routines */
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static int dump_buf_int (char* ptr, int count, char *comment, int rank);
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static int dump_buf_int (char* ptr, int count, char *comment, int rank) {
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int i=0;
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int *tptr;
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int c=0;
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tptr=(int*)ptr;
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printf("%1d ", rank);
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if (comment) printf("%s ", comment);
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if (count <0) {
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printf("cnt %d?\n", count);
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return (0);
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}
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if (count>5) c = 5;
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else c = count;
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printf("Cnt %1d ", count);
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for(i=0;i<c;i++) {
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printf("%1d [%1d] ", i, *tptr++);
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}
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if (c!=count) {
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tptr=(int*)ptr;
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printf(" ... %1d [%1d]", count-1, tptr[count-1]);
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}
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printf("\n");
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return (0);
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}
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/* Attention: this version of the reduce operations does not
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work for:
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- non-commutative operations
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- segment sizes which are not multiplies of the extent of the datatype
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meaning that at least one datatype must fit in the segment !
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*/
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int mca_coll_tuned_reduce_intra_chain( void *sendbuf, void *recvbuf, int count,
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ompi_datatype_t* datatype, ompi_op_t* op,
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int root, ompi_communicator_t* comm, uint32_t segsize,
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int fanout)
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{
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int ret, line, rank, size, i = 0;
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int recvcount, sendcount, prevcount, inbi, previnbi;
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int segcount, segindex, num_segments, realsegsize;
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char *inbuf[2] = {NULL, NULL};
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char *accumbuf = NULL;
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char *sendtmpbuf = NULL;
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long ext, lb;
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int typelng;
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int allocedaccumbuf;
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ompi_request_t* reqs[2];
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ompi_coll_chain_t* chain;
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size = ompi_comm_size(comm);
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rank = ompi_comm_rank(comm);
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OPAL_OUTPUT((mca_coll_tuned_stream,"coll:tuned:reduce_intra_chain rank %d", rank));
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/* ----------------------------------------------------------------- */
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/* setup the chain topology.
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* if the previous chain topology is the same, then use this cached copy
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* other wise recreate it.
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*/
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if ((comm->c_coll_selected_data->cached_chain) && (comm->c_coll_selected_data->cached_chain_root == root)
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&& (comm->c_coll_selected_data->cached_chain_fanout == fanout)) {
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chain = comm->c_coll_selected_data->cached_chain;
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}
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else {
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if (comm->c_coll_selected_data->cached_chain) { /* destroy previous chain if defined */
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ompi_coll_tuned_topo_destroy_chain (&comm->c_coll_selected_data->cached_chain);
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}
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comm->c_coll_selected_data->cached_chain = chain = ompi_coll_tuned_topo_build_chain(fanout,comm,root);
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comm->c_coll_selected_data->cached_chain_root = root;
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comm->c_coll_selected_data->cached_chain_fanout = fanout;
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}
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/* ----------------------------------------------------------------- */
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/* Determine number of segments and number of elements
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sent per operation */
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ompi_ddt_get_extent( datatype, &lb, &ext );
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ompi_ddt_type_size( datatype, &typelng );
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if( segsize > 0 ) {
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segcount = segsize/typelng;
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num_segments = count/segcount;
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if( (count % segcount) != 0 ) num_segments++;
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} else {
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segcount = count;
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num_segments = 1;
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}
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realsegsize = segcount * ext;
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/* printf("rank %d root %d count %d \t\t segsize %d typesize %d typeext %d realsegsize %d segcount %d num_segments %d\n", */
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/* rank, root, count, segsize, typelng, ext, realsegsize, segcount, num_segments); */
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/* ompi_coll_tuned_topo_dump_chain (chain, rank); */
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if (sendbuf != MPI_IN_PLACE) {
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sendtmpbuf = (char*) sendbuf;
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}
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else {
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sendtmpbuf = (char *) recvbuf;
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}
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/* handle special case when size == 1 */
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if (1 == size ) {
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if (sendbuf != MPI_IN_PLACE) {
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ompi_ddt_copy_content_same_ddt( datatype, count, recvbuf, sendbuf );
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}
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return MPI_SUCCESS;
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}
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/* handle non existant recv buffer (i.e. its NULL.. like basic allreduce uses!) */
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if (recvbuf) {
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accumbuf = (char *) recvbuf;
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allocedaccumbuf = 0;
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}
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else {
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accumbuf = (char*) malloc(realsegsize);
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if (accumbuf == NULL) { line = __LINE__; ret = -1; goto error_hndl; }
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allocedaccumbuf = 1;
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}
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/* ----------------------------------------------------------------- */
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/* non-leaf nodes -
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wait for children to send me data & forward up (if needed) */
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if( chain->chain_nextsize > 0 ) {
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/* Allocate two buffers for incoming segments */
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inbuf[0] = (char*) malloc(realsegsize);
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if (inbuf[0] == NULL) { line = __LINE__; ret = -1; goto error_hndl; }
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/* if there is chance to overlap communication -
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allocate second buffer */
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if (num_segments > 1 || chain->chain_nextsize > 1) {
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inbuf[1] = (char*) malloc(realsegsize);
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if (inbuf[1] == NULL) { line = __LINE__; ret = -1; goto error_hndl;}
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} else {
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inbuf[1] = NULL;
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}
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/* reset input buffer index and receive count */
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inbi = 0; recvcount = 0;
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/* for each segment */
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for (segindex = 0; segindex <= num_segments; segindex++) {
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prevcount = recvcount;
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/* recvcount - number of elements in current segment */
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if (segindex < num_segments-1) { recvcount = segcount; }
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else { recvcount = count - segcount*segindex; }
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/* for each child */
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for (i = 0; i < chain->chain_nextsize; i++) {
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/*
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We try to overlap communication:
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either with next segment or with the next child
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*/
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/* post irecv for current segindex on current child */
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if (segindex < num_segments) {
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if (0==i) { /* for the first step (1st child per segment) */
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/* we might be able to irecv directly into the accumulate buffer so that we */
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/* can reduce(op) this with our sendbuf in one step */
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/* as ompi_op_reduce only has two buffer pointers, this avoids */
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/* an extra memory copy GEF */
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/* BUT if we are root and are USING MPI_IN_PLACE this is wrong ek! */
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/* check for root might not be needed as it should be checked higher up */
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if ((MPI_IN_PLACE==sendbuf)&&(rank==root)) {
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ret = MCA_PML_CALL(irecv(inbuf[inbi],
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recvcount,datatype,
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chain->chain_next[i],
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MCA_COLL_BASE_TAG_REDUCE,
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comm, &reqs[inbi]));
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if (ret != MPI_SUCCESS) { line = __LINE__; goto error_hndl; }
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} else {
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ret = MCA_PML_CALL(irecv(accumbuf+segindex*realsegsize,
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recvcount,datatype,
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chain->chain_next[i],
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MCA_COLL_BASE_TAG_REDUCE,
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comm, &reqs[inbi]));
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if (ret != MPI_SUCCESS) { line = __LINE__; goto error_hndl; }
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}
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} /* if first segment */
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else { /* perform a irecv into the standard inbuf */
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ret = MCA_PML_CALL(irecv(inbuf[inbi],recvcount,datatype,
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chain->chain_next[i],
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MCA_COLL_BASE_TAG_REDUCE,
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comm, &reqs[inbi]));
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if (ret != MPI_SUCCESS) { line = __LINE__; goto error_hndl; }
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}
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}
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/* wait for previous req to complete, if any */
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previnbi = (inbi+1)%2;
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if (i > 0) {
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/* wait on data from previous child for current segment */
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ret = ompi_request_wait_all( 1, &reqs[previnbi], MPI_STATUSES_IGNORE );
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if (ret != MPI_SUCCESS) { line = __LINE__; goto error_hndl; }
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/* apply operation */
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if (1==i) {
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/* our first operation is to combine our own [sendbuf] data with the data we recvd from down stream */
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/* (but only if we are not root and not using MPI_IN_PLACE) */
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if ((MPI_IN_PLACE==sendbuf)&&(rank==root)) {
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ompi_op_reduce(op, inbuf[previnbi], accumbuf+segindex*realsegsize, recvcount, datatype );
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}
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else {
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ompi_op_reduce(op, sendtmpbuf+segindex*realsegsize, accumbuf+segindex*realsegsize, recvcount, datatype );
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}
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}
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else { /* not the first child, we can accumulate straight into accumbuf normally from the inbuf buffers */
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ompi_op_reduce(op, inbuf[previnbi], accumbuf+segindex*realsegsize, recvcount, datatype );
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} /* if i>0 (if not first step) */
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} else if (i == 0 && segindex > 0) {
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/* wait on data from last child for previous segment */
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ret = ompi_request_wait_all( 1, &reqs[previnbi], MPI_STATUSES_IGNORE );
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if (ret != MPI_SUCCESS) { line = __LINE__; goto error_hndl; }
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if (chain->chain_nextsize>1) { /* if I have more than one child */
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/* I reduce the data in the the inbuf and the accumbuf */
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/* as the accumbuf already contains some accumulated results */
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ompi_op_reduce(op, inbuf[previnbi], accumbuf+(segindex-1)*realsegsize, prevcount, datatype );
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}
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else { /* I have only one child, so I must combine my data (sendbuf) with the accumulated data in accumbuf */
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/* (but only if we are not root and not using MPI_IN_PLACE) */
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if ((MPI_IN_PLACE==sendbuf)&&(rank==root)) {
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ompi_op_reduce(op, inbuf[previnbi], accumbuf+(segindex-1)*realsegsize, prevcount, datatype );
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}
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else {
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ompi_op_reduce(op, sendtmpbuf+(segindex-1)*realsegsize, accumbuf+(segindex-1)*realsegsize, prevcount, datatype );
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}
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}
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/* all reduced on available data this step (i) complete, pass to the next process unless your the root */
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if (rank != root) {
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/* send combined/accumulated data to parent */
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ret = MCA_PML_CALL( send(accumbuf+(segindex-1)*realsegsize,
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prevcount,datatype, chain->chain_prev,
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MCA_COLL_BASE_TAG_REDUCE, MCA_PML_BASE_SEND_STANDARD, comm) );
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if (ret != MPI_SUCCESS) { line = __LINE__; goto error_hndl; }
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}
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/* we stop when segindex = number of segments (i.e. we do num_segment+1 steps to allow for pipelining */
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if (segindex == num_segments) break;
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}
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/* update input buffer index */
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inbi = previnbi;
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} /* end of for each child */
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} /* end of for each segment */
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/* clean up */
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if (inbuf!=NULL) {
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if (inbuf[0] != NULL) free(inbuf[0]);
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if (inbuf[1] != NULL) free(inbuf[1]);
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if (allocedaccumbuf) free(accumbuf);
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}
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}
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/* leaf nodes */
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else {
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/* Send segmented data to parents */
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for (segindex = 0; segindex < num_segments; segindex++) {
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if (segindex < num_segments-1) sendcount = segcount;
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else sendcount = count - segindex*segcount;
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ret = MCA_PML_CALL( send((char*)sendbuf+segindex*realsegsize, sendcount,
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datatype, chain->chain_prev,
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MCA_COLL_BASE_TAG_REDUCE, MCA_PML_BASE_SEND_STANDARD, comm) );
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if (ret != MPI_SUCCESS) { line = __LINE__; goto error_hndl; }
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}
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}
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return MPI_SUCCESS;
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/* error handler */
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error_hndl:
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OPAL_OUTPUT (( mca_coll_tuned_stream, "ERROR_HNDL: node %d file %s line %d error %d\n", rank, __FILE__, line, ret ));
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if( inbuf != NULL ) {
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if( inbuf[0] != NULL ) free(inbuf[0]);
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if( inbuf[1] != NULL ) free(inbuf[1]);
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if (allocedaccumbuf) free(accumbuf);
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}
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return ret;
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}
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int mca_coll_tuned_reduce_intra_pipeline( void *sendbuf, void *recvbuf,
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int count, ompi_datatype_t* datatype,
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ompi_op_t* op, int root,
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ompi_communicator_t* comm, uint32_t segsize )
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{
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int rank;
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rank = ompi_comm_rank(comm);
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OPAL_OUTPUT((mca_coll_tuned_stream,"coll:tuned:reduce_intra_pipeline rank %d", rank));
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return mca_coll_tuned_reduce_intra_chain( sendbuf,recvbuf, count,
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datatype, op, root, comm,
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segsize, 1 );
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}
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/*
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* Linear functions are copied from the BASIC coll module
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* they do not segment the message and are simple implementations
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* but for some small number of nodes and/or small data sizes they
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* are just as fast as tuned/tree based segmenting operations
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* and as such may be selected by the decision functions
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* These are copied into this module due to the way we select modules
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* in V1. i.e. in V2 we will handle this differently and so will not
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* have to duplicate code.
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* GEF Oct05 after asking Jeff.
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*/
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/* copied function (with appropriate renaming) starts here */
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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_tuned_reduce_intra_basic_linear(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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OPAL_OUTPUT((mca_coll_tuned_stream,"coll:tuned:reduce_intra_basic_linear rank %d", rank));
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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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/* see discussion in mca_coll_basic_reduce_lin_intra about extent and true extend */
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/* for reducing buffer allocation lengths.... */
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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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/* copied function (with appropriate renaming) ends here */
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/* The following are used by dynamic and forced rules */
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/* publish details of each algorithm and if its forced/fixed/locked in */
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/* as you add methods/algorithms you must update this and the query/map routines */
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int mca_coll_tuned_reduce_intra_check_forced ( )
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{
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mca_base_param_reg_int(&mca_coll_tuned_component.collm_version,
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"reduce_algorithm",
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"Which reduce algorithm is used. Can be locked down to choice of: 0 ignore, 1 linear, 2 chain, 3 pipeline",
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false, false, mca_coll_tuned_reduce_forced_choice,
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&mca_coll_tuned_reduce_forced_choice);
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mca_base_param_reg_int(&mca_coll_tuned_component.collm_version,
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"reduce_algorithm_segmentsize",
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"Segment size in bytes used by default for reduce algorithms. Only has meaning if algorithm is forced and supports segmenting. 0 bytes means no segmentation.",
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false, false, mca_coll_tuned_reduce_forced_segsize,
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&mca_coll_tuned_reduce_forced_segsize);
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mca_base_param_reg_int(&mca_coll_tuned_component.collm_version,
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"reduce_algorithm_tree_fanout",
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"Fanout for n-tree used for reduce algorithms. Only has meaning if algorithm is forced and supports n-tree topo based operation.",
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false, false,
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mca_coll_tuned_init_tree_fanout, /* get system wide default */
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&mca_coll_tuned_reduce_forced_tree_fanout);
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mca_base_param_reg_int(&mca_coll_tuned_component.collm_version,
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"reduce_algorithm_chain_fanout",
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"Fanout for chains used for reduce algorithms. Only has meaning if algorithm is forced and supports chain topo based operation.",
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false, false,
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mca_coll_tuned_init_chain_fanout, /* get system wide default */
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&mca_coll_tuned_reduce_forced_chain_fanout);
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return (MPI_SUCCESS);
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}
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int mca_coll_tuned_reduce_intra_query ( )
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{
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return (3); /* 3 algorithms available */
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}
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int mca_coll_tuned_reduce_intra_do_forced(void *sbuf, void* rbuf, int count,
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struct ompi_datatype_t *dtype,
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struct ompi_op_t *op, int root,
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struct ompi_communicator_t *comm)
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{
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OPAL_OUTPUT((mca_coll_tuned_stream,"coll:tuned:reduce_intra_do_forced selected algorithm %d", mca_coll_tuned_reduce_forced_choice));
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switch (mca_coll_tuned_reduce_forced_choice) {
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case (0): return mca_coll_tuned_reduce_intra_dec_fixed (sbuf, rbuf, count, dtype, op, root, comm);
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case (1): return mca_coll_tuned_reduce_intra_basic_linear (sbuf, rbuf, count, dtype, op, root, comm);
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case (2): return mca_coll_tuned_reduce_intra_chain (sbuf, rbuf, count, dtype, op, root, comm,
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mca_coll_tuned_reduce_forced_segsize, mca_coll_tuned_reduce_forced_chain_fanout);
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case (3): return mca_coll_tuned_reduce_intra_pipeline (sbuf, rbuf, count, dtype, op, root, comm,
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mca_coll_tuned_reduce_forced_segsize);
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default:
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OPAL_OUTPUT((mca_coll_tuned_stream,"coll:tuned:reduce_intra_do_forced attempt to select algorithm %d when only 0-%d is valid?",
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mca_coll_tuned_reduce_forced_choice, mca_coll_tuned_reduce_intra_query()));
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return (MPI_ERR_ARG);
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} /* switch */
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}
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