-/* smpi_coll.c -- various optimized routing for collectives */
+/* smpi_coll.c -- various optimized routing for collectives */
-/* Copyright (c) 2009-2015. The SimGrid Team.
- * All rights reserved. */
+/* Copyright (c) 2009-2017. 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. */
-#include <stdio.h>
-#include <string.h>
-#include <assert.h>
-
-#include "private.h"
-#include "colls/colls.h"
-#include "simgrid/sg_config.h"
+#include "src/smpi/private.h"
+#include "src/smpi/smpi_coll.hpp"
+#include "src/smpi/smpi_comm.hpp"
+#include "src/smpi/smpi_datatype.hpp"
+#include "src/smpi/smpi_op.hpp"
+#include "src/smpi/smpi_request.hpp"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_coll, smpi, "Logging specific to SMPI (coll)");
-s_mpi_coll_description_t mpi_coll_gather_description[] = {
- {"default", "gather default collective", (void*)smpi_mpi_gather},
- COLL_GATHERS(COLL_DESCRIPTION, COLL_COMMA), {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-
-s_mpi_coll_description_t mpi_coll_allgather_description[] = {
- {"default",
- "allgather default collective",
- (void*)smpi_mpi_allgather},
-COLL_ALLGATHERS(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_allgatherv_description[] = {
- {"default",
- "allgatherv default collective",
- (void*)smpi_mpi_allgatherv},
-COLL_ALLGATHERVS(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_allreduce_description[] = {
- {"default",
- "allreduce default collective",
- (void*)smpi_mpi_allreduce},
-COLL_ALLREDUCES(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_reduce_scatter_description[] = {
- {"default",
- "reduce_scatter default collective",
- (void*)smpi_mpi_reduce_scatter},
-COLL_REDUCE_SCATTERS(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_scatter_description[] = {
- {"default",
- "scatter default collective",
- (void*)smpi_mpi_scatter},
-COLL_SCATTERS(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_barrier_description[] = {
- {"default",
- "barrier default collective",
- (void*)smpi_mpi_barrier},
-COLL_BARRIERS(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-s_mpi_coll_description_t mpi_coll_alltoall_description[] = {
- {"default",
- "Ompi alltoall default collective",
- (void*)smpi_coll_tuned_alltoall_ompi2},
-COLL_ALLTOALLS(COLL_DESCRIPTION, COLL_COMMA),
- {"bruck",
- "Alltoall Bruck (SG) collective",
- (void*)smpi_coll_tuned_alltoall_bruck},
- {"basic_linear",
- "Alltoall basic linear (SG) collective",
- (void*)smpi_coll_tuned_alltoall_basic_linear},
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_alltoallv_description[] = {
- {"default",
- "Ompi alltoallv default collective",
- (void*)smpi_coll_basic_alltoallv},
-COLL_ALLTOALLVS(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_bcast_description[] = {
- {"default",
- "bcast default collective ",
- (void*)smpi_mpi_bcast},
-COLL_BCASTS(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
-
-s_mpi_coll_description_t mpi_coll_reduce_description[] = {
- {"default",
- "reduce default collective",
- (void*)smpi_mpi_reduce},
-COLL_REDUCES(COLL_DESCRIPTION, COLL_COMMA),
- {NULL, NULL, NULL} /* this array must be NULL terminated */
-};
+#define COLL_SETTER(cat, ret, args, args2)\
+int (*Colls::cat ) args;\
+void Colls::set_##cat (const char * name){\
+ int id = find_coll_description(mpi_coll_## cat ##_description,\
+ name,#cat);\
+ cat = reinterpret_cast<ret (*) args>\
+ (mpi_coll_## cat ##_description[id].coll);\
+ if (cat == nullptr)\
+ xbt_die("Collective "#cat" set to nullptr!");\
+}
+
+#define SET_COLL(coll)\
+ name = xbt_cfg_get_string("smpi/"#coll);\
+ if (name==nullptr || name[0] == '\0')\
+ name = selector_name;\
+ set_##coll(name);
+
+namespace simgrid{
+namespace smpi{
+void (*Colls::smpi_coll_cleanup_callback)();
+/* these arrays must be nullptr terminated */
+s_mpi_coll_description_t Colls::mpi_coll_gather_description[] = {
+ COLL_GATHERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_allgather_description[] = {
+ COLL_ALLGATHERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_allgatherv_description[] = {
+ COLL_ALLGATHERVS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_allreduce_description[] ={
+ COLL_ALLREDUCES(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_reduce_scatter_description[] = {
+ COLL_REDUCE_SCATTERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_scatter_description[] ={
+ COLL_SCATTERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_barrier_description[] ={
+ COLL_BARRIERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_alltoall_description[] = {
+ COLL_ALLTOALLS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_alltoallv_description[] = {
+ COLL_ALLTOALLVS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_bcast_description[] = {
+ COLL_BCASTS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t Colls::mpi_coll_reduce_description[] = {
+ COLL_REDUCES(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
/** Displays the long description of all registered models, and quit */
-void coll_help(const char *category, s_mpi_coll_description_t * table)
+void Colls::coll_help(const char *category, s_mpi_coll_description_t * table)
{
- int i;
- printf("Long description of the %s models accepted by this simulator:\n",
- category);
- for (i = 0; table[i].name; i++)
- printf(" %s: %s\n", table[i].name, table[i].description);
+ XBT_WARN("Long description of the %s models accepted by this simulator:\n", category);
+ for (int i = 0; table[i].name; i++)
+ XBT_WARN(" %s: %s\n", table[i].name, table[i].description);
}
-int find_coll_description(s_mpi_coll_description_t * table,
- char *name, const char *desc)
+int Colls::find_coll_description(s_mpi_coll_description_t * table, const char *name, const char *desc)
{
- int i;
- char *name_list = NULL;
- int selector_on=0;
- if(name==NULL){//no argument provided, use active selector's algorithm
- name=(char*)sg_cfg_get_string("smpi/coll_selector");
- selector_on=1;
- }
- for (i = 0; table[i].name; i++)
- if (!strcmp(name, table[i].name)) {
+ char *name_list = nullptr;
+ for (int i = 0; table[i].name; i++)
+ if (not strcmp(name, table[i].name)) {
if (strcmp(table[i].name,"default"))
XBT_INFO("Switch to algorithm %s for collective %s",table[i].name,desc);
return i;
}
- if(selector_on){
- // collective seems not handled by the active selector, try with default one
- name=(char*)"default";
- for (i = 0; table[i].name; i++)
- if (!strcmp(name, table[i].name)) {
- return i;
- }
- }
- if (!table[0].name)
+ if (not table[0].name)
xbt_die("No collective is valid for '%s'! This is a bug.",name);
name_list = xbt_strdup(table[0].name);
- for (i = 1; table[i].name; i++) {
- name_list = static_cast<char*>(xbt_realloc(name_list,
- strlen(name_list) + strlen(table[i].name) + 3));
- strcat(name_list, ", ");
- strcat(name_list, table[i].name);
+ for (int i = 1; table[i].name; i++) {
+ name_list = static_cast<char*>(xbt_realloc(name_list, strlen(name_list) + strlen(table[i].name) + 3));
+ strncat(name_list, ", ",2);
+ strncat(name_list, table[i].name, strlen(table[i].name));
}
xbt_die("Collective '%s' is invalid! Valid collectives are: %s.", name, name_list);
return -1;
}
-int (*mpi_coll_gather_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, int root, MPI_Comm);
-int (*mpi_coll_allgather_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
-int (*mpi_coll_allgatherv_fun)(void *, int, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
-int (*mpi_coll_allreduce_fun)(void *sbuf, void *rbuf, int rcount, MPI_Datatype dtype, MPI_Op op, MPI_Comm comm);
-int (*mpi_coll_alltoall_fun)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
-int (*mpi_coll_alltoallv_fun)(void *, int*, int*, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
-int (*mpi_coll_bcast_fun)(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm com);
-int (*mpi_coll_reduce_fun)(void *buf, void *rbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm);
-int (*mpi_coll_reduce_scatter_fun)(void *sbuf, void *rbuf, int *rcounts,MPI_Datatype dtype,MPI_Op op,MPI_Comm comm);
-int (*mpi_coll_scatter_fun)(void *sendbuf, int sendcount, MPI_Datatype sendtype,void *recvbuf, int recvcount, MPI_Datatype recvtype,int root, MPI_Comm comm);
-int (*mpi_coll_barrier_fun)(MPI_Comm comm);
-
-
-int smpi_coll_tuned_alltoall_ompi2(void *sendbuf, int sendcount,
- MPI_Datatype sendtype, void *recvbuf,
- int recvcount, MPI_Datatype recvtype,
- MPI_Comm comm)
+
+
+COLL_APPLY(COLL_SETTER,COLL_GATHER_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_ALLGATHER_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_ALLGATHERV_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_REDUCE_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_ALLREDUCE_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_REDUCE_SCATTER_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_SCATTER_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_BARRIER_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_BCAST_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_ALLTOALL_SIG,"");
+COLL_APPLY(COLL_SETTER,COLL_ALLTOALLV_SIG,"");
+
+
+void Colls::set_collectives(){
+ const char* selector_name = static_cast<char*>(xbt_cfg_get_string("smpi/coll-selector"));
+ if (selector_name==nullptr || selector_name[0] == '\0')
+ selector_name = "default";
+
+ const char* name;
+
+ SET_COLL(gather);
+ SET_COLL(allgather);
+ SET_COLL(allgatherv);
+ SET_COLL(allreduce);
+ SET_COLL(alltoall);
+ SET_COLL(alltoallv);
+ SET_COLL(reduce);
+ SET_COLL(reduce_scatter);
+ SET_COLL(scatter);
+ SET_COLL(bcast);
+ SET_COLL(barrier);
+}
+
+
+//Implementations of the single algorith collectives
+
+int Colls::gatherv(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf, int *recvcounts, int *displs,
+ MPI_Datatype recvtype, int root, MPI_Comm comm)
{
- int size, sendsize;
- size = smpi_comm_size(comm);
- sendsize = smpi_datatype_size(sendtype) * sendcount;
- if (sendsize < 200 && size > 12) {
- return
- smpi_coll_tuned_alltoall_bruck(sendbuf, sendcount, sendtype,
- recvbuf, recvcount, recvtype,
- comm);
- } else if (sendsize < 3000) {
- return
- smpi_coll_tuned_alltoall_basic_linear(sendbuf, sendcount,
- sendtype, recvbuf,
- recvcount, recvtype, comm);
+ int system_tag = COLL_TAG_GATHERV;
+ MPI_Aint lb = 0;
+ MPI_Aint recvext = 0;
+
+ int rank = comm->rank();
+ int size = comm->size();
+ if (rank != root) {
+ // Send buffer to root
+ Request::send(sendbuf, sendcount, sendtype, root, system_tag, comm);
} else {
- return
- smpi_coll_tuned_alltoall_ring(sendbuf, sendcount, sendtype,
- recvbuf, recvcount, recvtype,
- comm);
+ recvtype->extent(&lb, &recvext);
+ // Local copy from root
+ Datatype::copy(sendbuf, sendcount, sendtype, static_cast<char*>(recvbuf) + displs[root] * recvext,
+ recvcounts[root], recvtype);
+ // Receive buffers from senders
+ MPI_Request *requests = xbt_new(MPI_Request, size - 1);
+ int index = 0;
+ for (int src = 0; src < size; src++) {
+ if(src != root) {
+ requests[index] = Request::irecv_init(static_cast<char*>(recvbuf) + displs[src] * recvext,
+ recvcounts[src], recvtype, src, system_tag, comm);
+ index++;
+ }
+ }
+ // Wait for completion of irecv's.
+ Request::startall(size - 1, requests);
+ Request::waitall(size - 1, requests, MPI_STATUS_IGNORE);
+ for (int src = 0; src < size-1; src++) {
+ Request::unref(&requests[src]);
+ }
+ xbt_free(requests);
}
+ return MPI_SUCCESS;
}
-/**
- * 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 smpi_coll_tuned_alltoall_bruck(void *sendbuf, int sendcount,
- MPI_Datatype sendtype, void *recvbuf,
- int recvcount, MPI_Datatype recvtype,
- MPI_Comm comm)
+
+int Colls::scatterv(void *sendbuf, int *sendcounts, int *displs, MPI_Datatype sendtype, void *recvbuf, int recvcount,
+ MPI_Datatype recvtype, int root, MPI_Comm comm)
{
- int system_tag = 777;
- int i, rank, size, err, count;
- MPI_Aint lb;
+ int system_tag = COLL_TAG_SCATTERV;
+ MPI_Aint lb = 0;
MPI_Aint sendext = 0;
- MPI_Aint recvext = 0;
- MPI_Request *requests;
-
- // FIXME: check implementation
- rank = smpi_comm_rank(comm);
- size = smpi_comm_size(comm);
- XBT_DEBUG("<%d> algorithm alltoall_bruck() called.", rank);
- smpi_datatype_extent(sendtype, &lb, &sendext);
- 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;
- }
- requests[count] =
- smpi_irecv_init((char *)recvbuf + i * recvcount * recvext, recvcount,
- recvtype, i, system_tag, comm);
- count++;
+
+ int rank = comm->rank();
+ int size = comm->size();
+ if(rank != root) {
+ // Recv buffer from root
+ Request::recv(recvbuf, recvcount, recvtype, root, system_tag, comm, MPI_STATUS_IGNORE);
+ } else {
+ sendtype->extent(&lb, &sendext);
+ // Local copy from root
+ if(recvbuf!=MPI_IN_PLACE){
+ Datatype::copy(static_cast<char *>(sendbuf) + displs[root] * sendext, sendcounts[root],
+ sendtype, recvbuf, recvcount, recvtype);
}
- /* Now create all sends */
- for (i = 0; i < size; ++i) {
- if (i == rank) {
- XBT_DEBUG("<%d> skip request creation [dst = %d, sendcount = %d]",
- rank, i, sendcount);
- continue;
+ // Send buffers to receivers
+ MPI_Request *requests = xbt_new(MPI_Request, size - 1);
+ int index = 0;
+ for (int dst = 0; dst < size; dst++) {
+ if (dst != root) {
+ requests[index] = Request::isend_init(static_cast<char *>(sendbuf) + displs[dst] * sendext, sendcounts[dst],
+ sendtype, dst, system_tag, comm);
+ index++;
}
- 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);
- for(i = 0; i < count; i++) {
- if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);
+ // Wait for completion of isend's.
+ Request::startall(size - 1, requests);
+ Request::waitall(size - 1, requests, MPI_STATUS_IGNORE);
+ for (int dst = 0; dst < size-1; dst++) {
+ Request::unref(&requests[dst]);
}
xbt_free(requests);
}
return MPI_SUCCESS;
}
-/**
- * Alltoall basic_linear (STARMPI:alltoall-simple)
- **/
-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 Colls::scan(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, 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);
- smpi_datatype_extent(sendtype, &lb, &sendext);
- 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++;
+ int system_tag = -888;
+ MPI_Aint lb = 0;
+ MPI_Aint dataext = 0;
+
+ int rank = comm->rank();
+ int size = comm->size();
+
+ datatype->extent(&lb, &dataext);
+
+ // Local copy from self
+ Datatype::copy(sendbuf, count, datatype, recvbuf, count, datatype);
+
+ // Send/Recv buffers to/from others
+ MPI_Request *requests = xbt_new(MPI_Request, size - 1);
+ void **tmpbufs = xbt_new(void *, rank);
+ int index = 0;
+ for (int other = 0; other < rank; other++) {
+ tmpbufs[index] = smpi_get_tmp_sendbuffer(count * dataext);
+ requests[index] = Request::irecv_init(tmpbufs[index], count, datatype, other, system_tag, comm);
+ index++;
+ }
+ for (int other = rank + 1; other < size; other++) {
+ requests[index] = Request::isend_init(sendbuf, count, datatype, other, system_tag, comm);
+ index++;
+ }
+ // Wait for completion of all comms.
+ Request::startall(size - 1, requests);
+
+ if(op != MPI_OP_NULL && op->is_commutative()){
+ for (int other = 0; other < size - 1; other++) {
+ index = Request::waitany(size - 1, requests, MPI_STATUS_IGNORE);
+ if(index == MPI_UNDEFINED) {
+ break;
+ }
+ if(index < rank) {
+ // #Request is below rank: it's a irecv
+ op->apply( tmpbufs[index], recvbuf, &count, datatype);
+ }
}
- /* 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);
- for(i = 0; i < count; i++) {
- if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);
+ }else{
+ //non commutative case, wait in order
+ for (int other = 0; other < size - 1; other++) {
+ Request::wait(&(requests[other]), MPI_STATUS_IGNORE);
+ if(index < rank && op!=MPI_OP_NULL) {
+ op->apply( tmpbufs[other], recvbuf, &count, datatype);
+ }
}
- xbt_free(requests);
}
- return err;
+ for(index = 0; index < rank; index++) {
+ smpi_free_tmp_buffer(tmpbufs[index]);
+ }
+ for(index = 0; index < size-1; index++) {
+ Request::unref(&requests[index]);
+ }
+ xbt_free(tmpbufs);
+ xbt_free(requests);
+ 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 Colls::exscan(void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, 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);
- smpi_datatype_extent(sendtype, &lb, &sendext);
- 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;
+ int system_tag = -888;
+ MPI_Aint lb = 0;
+ MPI_Aint dataext = 0;
+ int recvbuf_is_empty=1;
+ int rank = comm->rank();
+ int size = comm->size();
+
+ datatype->extent(&lb, &dataext);
+
+ // Send/Recv buffers to/from others
+ MPI_Request *requests = xbt_new(MPI_Request, size - 1);
+ void **tmpbufs = xbt_new(void *, rank);
+ int index = 0;
+ for (int other = 0; other < rank; other++) {
+ tmpbufs[index] = smpi_get_tmp_sendbuffer(count * dataext);
+ requests[index] = Request::irecv_init(tmpbufs[index], count, datatype, other, system_tag, comm);
+ index++;
+ }
+ for (int other = rank + 1; other < size; other++) {
+ requests[index] = Request::isend_init(sendbuf, count, datatype, other, system_tag, comm);
+ index++;
+ }
+ // Wait for completion of all comms.
+ Request::startall(size - 1, requests);
+
+ if(op != MPI_OP_NULL && op->is_commutative()){
+ for (int other = 0; other < size - 1; other++) {
+ index = Request::waitany(size - 1, requests, MPI_STATUS_IGNORE);
+ if(index == MPI_UNDEFINED) {
+ break;
}
- 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;
+ if(index < rank) {
+ if(recvbuf_is_empty){
+ Datatype::copy(tmpbufs[index], count, datatype, recvbuf, count, datatype);
+ recvbuf_is_empty=0;
+ } else
+ // #Request is below rank: it's a irecv
+ op->apply( tmpbufs[index], recvbuf, &count, datatype);
}
- 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);
- for(i = 0; i < count; i++) {
- if(requests[i]!=MPI_REQUEST_NULL) smpi_mpi_request_free(&requests[i]);
+ }else{
+ //non commutative case, wait in order
+ for (int other = 0; other < size - 1; other++) {
+ Request::wait(&(requests[other]), MPI_STATUS_IGNORE);
+ if(index < rank) {
+ if (recvbuf_is_empty) {
+ Datatype::copy(tmpbufs[other], count, datatype, recvbuf, count, datatype);
+ recvbuf_is_empty = 0;
+ } else
+ if(op!=MPI_OP_NULL)
+ op->apply( tmpbufs[other], recvbuf, &count, datatype);
+ }
}
- xbt_free(requests);
}
- return err;
+ for(index = 0; index < rank; index++) {
+ smpi_free_tmp_buffer(tmpbufs[index]);
+ }
+ for(index = 0; index < size-1; index++) {
+ Request::unref(&requests[index]);
+ }
+ xbt_free(tmpbufs);
+ xbt_free(requests);
+ return MPI_SUCCESS;
+}
+
+}
}
