X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/d30fcaa41c0aabda5afef028a793b9e295a4aadb..6b188a3ca7fe91cf125a08229fb4fe51eee26e6d:/src/smpi/smpi_coll.c diff --git a/src/smpi/smpi_coll.c b/src/smpi/smpi_coll.c index 23dee9bf86..7798de86ea 100644 --- a/src/smpi/smpi_coll.c +++ b/src/smpi/smpi_coll.c @@ -1,244 +1,417 @@ -/* $Id$tag */ - /* smpi_coll.c -- various optimized routing for collectives */ -/* Copyright (c) 2009 Stephane Genaud. */ -/* All rights reserved. */ +/* Copyright (c) 2009, 2010. The SimGrid Team. + * All rights reserved. */ /* This program is free software; you can redistribute it and/or modify it - * * under the terms of the license (GNU LGPL) which comes with this package. */ - + * under the terms of the license (GNU LGPL) which comes with this package. */ #include -#include #include +#include #include "private.h" - -/* proctree taken and translated from P2P-MPI */ - -struct proc_tree { - int PROCTREE_A; - int numChildren; - int * child; - int parent; - int me; - int root; - int isRoot; +XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_coll, smpi, + "Logging specific to SMPI (coll)"); + +struct s_proc_tree { + int PROCTREE_A; + int numChildren; + int *child; + int parent; + int me; + int root; + int isRoot; }; -typedef struct proc_tree * proc_tree_t; - - - -/* prototypes */ -void build_tree( int index, int extent, proc_tree_t *tree); -proc_tree_t alloc_tree( int arity ); -void free_tree( proc_tree_t tree); -void print_tree(proc_tree_t tree); -int binomial_tree_bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm comm); - - +typedef struct s_proc_tree *proc_tree_t; /** * alloc and init **/ -proc_tree_t alloc_tree( int arity ) { - proc_tree_t tree = malloc(1*sizeof(struct proc_tree)); - int i; - - tree->PROCTREE_A = arity; - tree->isRoot = 0; - tree->numChildren = 0; - tree->child = malloc(arity*sizeof(int)); - for (i=0; i < arity; i++) { - tree->child[i] = -1; - } - tree->root = -1; - tree->parent = -1; - return( tree ); +static proc_tree_t alloc_tree(int arity) +{ + proc_tree_t tree; + int i; + + tree = xbt_new(struct s_proc_tree, 1); + tree->PROCTREE_A = arity; + tree->isRoot = 0; + tree->numChildren = 0; + tree->child = xbt_new(int, arity); + for (i = 0; i < arity; i++) { + tree->child[i] = -1; + } + tree->root = -1; + tree->parent = -1; + return tree; } /** * free **/ -void free_tree( proc_tree_t tree) { - free (tree->child ); - free(tree); +static void free_tree(proc_tree_t tree) +{ + xbt_free(tree->child); + xbt_free(tree); } - - /** * Build the tree depending on a process rank (index) and the group size (extent) - * @param index the rank of the calling process - * @param extent the total number of processes + * @param root the rank of the tree root + * @param rank the rank of the calling process + * @param size the total number of processes **/ -void build_tree( int index, int extent, proc_tree_t *tree) { - int places = (*tree)->PROCTREE_A * index; - int i; - int ch; - int pr; - - (*tree)->me = index; - (*tree)->root = 0 ; - - for (i = 1; i <= (*tree)->PROCTREE_A; i++) { - ++places; - ch = (*tree)->PROCTREE_A * index + i + (*tree)->root; - //printf("places %d\n",places); - ch %= extent; - if (places < extent) { - //printf("ch <%d> = <%d>\n",i,ch); - //printf("adding to the tree at index <%d>\n\n",i-1); - (*tree)->child[i - 1] = ch; - (*tree)->numChildren++; - } - else { - //fprintf(stderr,"not adding to the tree\n"); - } - } - //fprintf(stderr,"procTree.numChildren <%d>\n",(*tree)->numChildren); - - if (index == (*tree)->root) { - (*tree)->isRoot = 1; - } - else { - (*tree)->isRoot = 0; - pr = (index - 1) / (*tree)->PROCTREE_A; - (*tree)->parent = pr; - } +static void build_tree(int root, int rank, int size, proc_tree_t * tree) +{ + int index = (rank - root + size) % size; + int firstChildIdx = index * (*tree)->PROCTREE_A + 1; + int i; + + (*tree)->me = rank; + (*tree)->root = root; + + for (i = 0; i < (*tree)->PROCTREE_A && firstChildIdx + i < size; i++) { + (*tree)->child[i] = (firstChildIdx + i + root) % size; + (*tree)->numChildren++; + } + if (rank == root) { + (*tree)->isRoot = 1; + } else { + (*tree)->isRoot = 0; + (*tree)->parent = (((index - 1) / (*tree)->PROCTREE_A) + root) % size; + } } +/** + * bcast + **/ +static void tree_bcast(void *buf, int count, MPI_Datatype datatype, + MPI_Comm comm, proc_tree_t tree) +{ + int system_tag = 999; // used negative int but smpi_create_request() declares this illegal (to be checked) + int rank, i; + MPI_Request *requests; + + rank = smpi_comm_rank(comm); + /* wait for data from my parent in the tree */ + if (!tree->isRoot) { + XBT_DEBUG("<%d> tree_bcast(): i am not root: recv from %d, tag=%d)", + rank, tree->parent, system_tag + rank); + smpi_mpi_recv(buf, count, datatype, tree->parent, system_tag + rank, + comm, MPI_STATUS_IGNORE); + } + requests = xbt_new(MPI_Request, tree->numChildren); + XBT_DEBUG("<%d> creates %d requests (1 per child)", rank, + tree->numChildren); + /* iniates sends to ranks lower in the tree */ + for (i = 0; i < tree->numChildren; i++) { + if (tree->child[i] == -1) { + requests[i] = MPI_REQUEST_NULL; + } else { + XBT_DEBUG("<%d> send to <%d>, tag=%d", rank, tree->child[i], + system_tag + tree->child[i]); + requests[i] = + smpi_isend_init(buf, count, datatype, tree->child[i], + system_tag + tree->child[i], comm); + } + } + smpi_mpi_startall(tree->numChildren, requests); + smpi_mpi_waitall(tree->numChildren, requests, MPI_STATUS_IGNORE); + xbt_free(requests); +} -void print_tree(proc_tree_t tree) { - int i; - char *spacer; - if (-1 != tree->parent ) { - printf("[%d]\n +---",tree->parent); - spacer= strdup(" "); - } - else { - spacer=strdup(""); - } - printf("<%d>\n",tree->me); - for (i=0;i < tree->numChildren; i++) { - printf("%s +--- %d\n", spacer,tree->child[i]); - } - free(spacer); +/** + * anti-bcast + **/ +static void tree_antibcast(void *buf, int count, MPI_Datatype datatype, + MPI_Comm comm, proc_tree_t tree) +{ + int system_tag = 999; // used negative int but smpi_create_request() declares this illegal (to be checked) + int rank, i; + MPI_Request *requests; + + rank = smpi_comm_rank(comm); + // everyone sends to its parent, except root. + if (!tree->isRoot) { + XBT_DEBUG("<%d> tree_antibcast(): i am not root: send to %d, tag=%d)", + rank, tree->parent, system_tag + rank); + smpi_mpi_send(buf, count, datatype, tree->parent, system_tag + rank, + comm); + } + //every one receives as many messages as it has children + requests = xbt_new(MPI_Request, tree->numChildren); + XBT_DEBUG("<%d> creates %d requests (1 per child)", rank, + tree->numChildren); + for (i = 0; i < tree->numChildren; i++) { + if (tree->child[i] == -1) { + requests[i] = MPI_REQUEST_NULL; + } else { + XBT_DEBUG("<%d> recv from <%d>, tag=%d", rank, tree->child[i], + system_tag + tree->child[i]); + requests[i] = + smpi_irecv_init(buf, count, datatype, tree->child[i], + system_tag + tree->child[i], comm); + } + } + smpi_mpi_startall(tree->numChildren, requests); + smpi_mpi_waitall(tree->numChildren, requests, MPI_STATUS_IGNORE); + xbt_free(requests); } - + /** - * bcast + * bcast with a binary, ternary, or whatever tree .. + **/ +void nary_tree_bcast(void *buf, int count, MPI_Datatype datatype, int root, + MPI_Comm comm, int arity) +{ + proc_tree_t tree = alloc_tree(arity); + int rank, size; + + rank = smpi_comm_rank(comm); + size = smpi_comm_size(comm); + build_tree(root, rank, size, &tree); + tree_bcast(buf, count, datatype, comm, tree); + free_tree(tree); +} + +/** + * barrier with a binary, ternary, or whatever tree .. **/ -int binomial_tree_bcast(void *buf, int count, MPI_Datatype datatype, int root, - MPI_Comm comm) +void nary_tree_barrier(MPI_Comm comm, int arity) { - int system_tag = 999; // used negative int but smpi_create_request() declares this illegal (to be checked) - int rank; - int retval = MPI_SUCCESS; - int i; - smpi_mpi_request_t request; - smpi_mpi_request_t * requests; - void **tmpbufs; - - rank = smpi_mpi_comm_rank(comm); - proc_tree_t tree = alloc_tree( 2 ); // arity=2: a binomial tree - - build_tree( rank, comm->size, &tree ); - /* wait for data from my parent in the tree */ - if (!tree->isRoot) { -#ifdef DEBUG_STEPH - printf("[%d] recv(%d from %d, tag=%d)\n",rank,rank, tree->parent, system_tag+rank); -#endif - retval = smpi_create_request(buf, count, datatype, - tree->parent, rank, - system_tag + rank, - comm, &request); - if (MPI_SUCCESS != retval) { - printf("** internal error: smpi_create_request() rank=%d returned retval=%d, %s:%d\n", - rank,retval,__FILE__,__LINE__); - } - smpi_mpi_irecv(request); -#ifdef DEBUG_STEPH - printf("[%d] waiting on irecv from %d\n",rank , tree->parent); -#endif - smpi_mpi_wait(request, MPI_STATUS_IGNORE); - } - - tmpbufs = xbt_malloc( tree->numChildren * sizeof(void *)); - requests = xbt_malloc( tree->numChildren * sizeof(smpi_mpi_request_t)); -#ifdef DEBUG_STEPH - printf("[%d] creates %d requests\n",rank,tree->numChildren); -#endif - - /* iniates sends to ranks lower in the tree */ - for (i=0; i < tree->numChildren; i++) { - if (tree->child[i] != -1) { -#ifdef DEBUG_STEPH - printf("[%d] send(%d->%d, tag=%d)\n",rank,rank, tree->child[i], system_tag+tree->child[i]); -#endif - tmpbufs[i] = xbt_malloc( count * datatype->size); - memcpy( tmpbufs[i], buf, count * datatype->size * sizeof(char)); - retval = smpi_create_request(tmpbufs[i], count, datatype, - rank, tree->child[i], - system_tag + tree->child[i], - comm, &(requests[i])); -#ifdef DEBUG_STEPH - printf("[%d] after create req[%d]=%p req->(src=%d,dst=%d)\n",rank , i, requests[i],requests[i]->src,requests[i]->dst ); -#endif - if (MPI_SUCCESS != retval) { - printf("** internal error: smpi_create_request() rank=%d returned retval=%d, %s:%d\n", - rank,retval,__FILE__,__LINE__); - } - smpi_mpi_isend(requests[i]); - /* FIXME : we should not wait immediately here. See next FIXME. */ - smpi_mpi_wait( requests[i], MPI_STATUS_IGNORE); - xbt_free(tmpbufs[i]); - xbt_free(requests[i]); - } - } - /* FIXME : normally, we sould wait only once all isend have been issued: - * this is the following commented code. It deadlocks, probably because - * of a bug in the sender process */ - - /* wait for completion of sends */ - /* printf("[%d] wait for %d send completions\n",rank,tree->numChildren); - smpi_mpi_waitall( tree->numChildren, requests, MPI_STATUS_IGNORE); - printf("[%d] reqs completed\n)",rank); - */ - - xbt_free(tmpbufs); - xbt_free(requests); - return(retval); + proc_tree_t tree = alloc_tree(arity); + int rank, size; + char dummy = '$'; + + rank = smpi_comm_rank(comm); + size = smpi_comm_size(comm); + build_tree(0, rank, size, &tree); + tree_antibcast(&dummy, 1, MPI_CHAR, comm, tree); + tree_bcast(&dummy, 1, MPI_CHAR, comm, tree); + free_tree(tree); } /** - * example usage + * Alltoall Bruck + * + * Openmpi calls this routine when the message size sent to each rank < 2000 bytes and size < 12 + * FIXME: uh, check smpi_pmpi again, but this routine is called for > 12, not + * less... **/ -/* - * int main() { - - int rank; - int size=12; - - proc_tree_t tree; - for (rank=0;rank algorithm alltoall_bruck() called.", rank); + err = smpi_datatype_extent(sendtype, &lb, &sendext); + err = smpi_datatype_extent(recvtype, &lb, &recvext); + /* Local copy from self */ + err = + smpi_datatype_copy((char *)sendbuf + rank * sendcount * sendext, + sendcount, sendtype, + (char *)recvbuf + rank * recvcount * recvext, + recvcount, recvtype); + if (err == MPI_SUCCESS && size > 1) { + /* Initiate all send/recv to/from others. */ + requests = xbt_new(MPI_Request, 2 * (size - 1)); + count = 0; + /* Create all receives that will be posted first */ + for (i = 0; i < size; ++i) { + if (i == rank) { + XBT_DEBUG("<%d> skip request creation [src = %d, recvcount = %d]", + rank, i, recvcount); + continue; } - printf("-------------- bcast ----------\n"); - for (rank=0;rank skip request creation [dst = %d, sendcount = %d]", + rank, i, sendcount); + continue; } + requests[count] = + smpi_isend_init((char *)sendbuf + i * sendcount * sendext, sendcount, + sendtype, i, system_tag, comm); + count++; + } + /* Wait for them all. */ + smpi_mpi_startall(count, requests); + XBT_DEBUG("<%d> wait for %d requests", rank, count); + smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE); + xbt_free(requests); + } + return MPI_SUCCESS; +} - +/** + * Alltoall basic_linear + **/ +int smpi_coll_tuned_alltoall_basic_linear(void *sendbuf, int sendcount, + MPI_Datatype sendtype, + void *recvbuf, int recvcount, + MPI_Datatype recvtype, + MPI_Comm comm) +{ + int system_tag = 888; + int i, rank, size, err, count; + MPI_Aint lb = 0, sendext = 0, recvext = 0; + MPI_Request *requests; + + /* Initialize. */ + rank = smpi_comm_rank(comm); + size = smpi_comm_size(comm); + XBT_DEBUG("<%d> algorithm alltoall_basic_linear() called.", rank); + err = smpi_datatype_extent(sendtype, &lb, &sendext); + err = smpi_datatype_extent(recvtype, &lb, &recvext); + /* simple optimization */ + err = smpi_datatype_copy((char *)sendbuf + rank * sendcount * sendext, + sendcount, sendtype, + (char *)recvbuf + rank * recvcount * recvext, + recvcount, recvtype); + if (err == MPI_SUCCESS && size > 1) { + /* Initiate all send/recv to/from others. */ + requests = xbt_new(MPI_Request, 2 * (size - 1)); + /* Post all receives first -- a simple optimization */ + count = 0; + for (i = (rank + 1) % size; i != rank; i = (i + 1) % size) { + requests[count] = + smpi_irecv_init((char *)recvbuf + i * recvcount * recvext, recvcount, + recvtype, i, system_tag, comm); + count++; + } + /* Now post all sends in reverse order + * - We would like to minimize the search time through message queue + * when messages actually arrive in the order in which they were posted. + * TODO: check the previous assertion + */ + for (i = (rank + size - 1) % size; i != rank; i = (i + size - 1) % size) { + requests[count] = + smpi_isend_init((char *)sendbuf + i * sendcount * sendext, sendcount, + sendtype, i, system_tag, comm); + count++; + } + /* Wait for them all. */ + smpi_mpi_startall(count, requests); + XBT_DEBUG("<%d> wait for %d requests", rank, count); + smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE); + xbt_free(requests); + } + return err; } -*/ - +/** + * Alltoall pairwise + * + * this algorithm performs size steps (1<=s<=size) and + * at each step s, a process p sends iand receive to.from a unique distinct remote process + * size=5 : s=1: 4->0->1, 0->1->2, 1->2->3, ... + * s=2: 3->0->2, 4->1->3, 0->2->4, 1->3->0 , 2->4->1 + * .... + * Openmpi calls this routine when the message size sent to each rank is greater than 3000 bytes + **/ +int smpi_coll_tuned_alltoall_pairwise(void *sendbuf, int sendcount, + MPI_Datatype sendtype, void *recvbuf, + int recvcount, MPI_Datatype recvtype, + MPI_Comm comm) +{ + int system_tag = 999; + int rank, size, step, sendto, recvfrom, sendsize, recvsize; + + rank = smpi_comm_rank(comm); + size = smpi_comm_size(comm); + XBT_DEBUG("<%d> algorithm alltoall_pairwise() called.", rank); + sendsize = smpi_datatype_size(sendtype); + recvsize = smpi_datatype_size(recvtype); + /* Perform pairwise exchange - starting from 1 so the local copy is last */ + for (step = 1; step < size + 1; step++) { + /* who do we talk to in this step? */ + sendto = (rank + step) % size; + recvfrom = (rank + size - step) % size; + /* send and receive */ + smpi_mpi_sendrecv(&((char *) sendbuf)[sendto * sendsize * sendcount], + sendcount, sendtype, sendto, system_tag, + &((char *) recvbuf)[recvfrom * recvsize * recvcount], + recvcount, recvtype, recvfrom, system_tag, comm, + MPI_STATUS_IGNORE); + } + return MPI_SUCCESS; +} +int smpi_coll_basic_alltoallv(void *sendbuf, int *sendcounts, + int *senddisps, MPI_Datatype sendtype, + void *recvbuf, int *recvcounts, + int *recvdisps, MPI_Datatype recvtype, + MPI_Comm comm) +{ + int system_tag = 889; + int i, rank, size, err, count; + MPI_Aint lb = 0, sendext = 0, recvext = 0; + MPI_Request *requests; + + /* Initialize. */ + rank = smpi_comm_rank(comm); + size = smpi_comm_size(comm); + XBT_DEBUG("<%d> algorithm basic_alltoallv() called.", rank); + err = smpi_datatype_extent(sendtype, &lb, &sendext); + err = smpi_datatype_extent(recvtype, &lb, &recvext); + /* Local copy from self */ + err = + smpi_datatype_copy((char *)sendbuf + senddisps[rank] * sendext, + sendcounts[rank], sendtype, + (char *)recvbuf + recvdisps[rank] * recvext, + recvcounts[rank], recvtype); + if (err == MPI_SUCCESS && size > 1) { + /* Initiate all send/recv to/from others. */ + requests = xbt_new(MPI_Request, 2 * (size - 1)); + count = 0; + /* Create all receives that will be posted first */ + for (i = 0; i < size; ++i) { + if (i == rank || recvcounts[i] == 0) { + XBT_DEBUG + ("<%d> skip request creation [src = %d, recvcounts[src] = %d]", + rank, i, recvcounts[i]); + continue; + } + requests[count] = + smpi_irecv_init((char *)recvbuf + recvdisps[i] * recvext, + recvcounts[i], recvtype, i, system_tag, comm); + count++; + } + /* Now create all sends */ + for (i = 0; i < size; ++i) { + if (i == rank || sendcounts[i] == 0) { + XBT_DEBUG + ("<%d> skip request creation [dst = %d, sendcounts[dst] = %d]", + rank, i, sendcounts[i]); + continue; + } + requests[count] = + smpi_isend_init((char *)sendbuf + senddisps[i] * sendext, + sendcounts[i], sendtype, i, system_tag, comm); + count++; + } + /* Wait for them all. */ + smpi_mpi_startall(count, requests); + XBT_DEBUG("<%d> wait for %d requests", rank, count); + smpi_mpi_waitall(count, requests, MPI_STATUS_IGNORE); + xbt_free(requests); + } + return err; +}