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", reinterpret_cast<void*>(&smpi_mpi_gather)},
COLL_GATHERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} /* this array must be nullptr terminated */
};
-s_mpi_coll_description_t mpi_coll_allgather_description[] = { {"default", "allgather default collective",
- reinterpret_cast<void*>(&smpi_mpi_allgather)}, COLL_ALLGATHERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
+s_mpi_coll_description_t mpi_coll_allgather_description[] = {
+ COLL_ALLGATHERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}
+};
-s_mpi_coll_description_t mpi_coll_allgatherv_description[] = {{"default", "allgatherv default collective",
- reinterpret_cast<void*>(&smpi_mpi_allgatherv)}, COLL_ALLGATHERVS(COLL_DESCRIPTION, COLL_COMMA),
+s_mpi_coll_description_t mpi_coll_allgatherv_description[] = { COLL_ALLGATHERVS(COLL_DESCRIPTION, COLL_COMMA),
{nullptr, nullptr, nullptr} /* this array must be nullptr terminated */
};
-s_mpi_coll_description_t mpi_coll_allreduce_description[] = { {"default", "allreduce default collective",
- reinterpret_cast<void*>(&smpi_mpi_allreduce)}, COLL_ALLREDUCES(COLL_DESCRIPTION, COLL_COMMA),
+s_mpi_coll_description_t mpi_coll_allreduce_description[] ={ COLL_ALLREDUCES(COLL_DESCRIPTION, COLL_COMMA),
{nullptr, nullptr, nullptr} /* this array must be nullptr terminated */
};
-s_mpi_coll_description_t mpi_coll_reduce_scatter_description[] = {{"default", "reduce_scatter default collective",
- reinterpret_cast<void*>(&smpi_mpi_reduce_scatter)}, COLL_REDUCE_SCATTERS(COLL_DESCRIPTION, COLL_COMMA),
+s_mpi_coll_description_t mpi_coll_reduce_scatter_description[] = {COLL_REDUCE_SCATTERS(COLL_DESCRIPTION, COLL_COMMA),
{nullptr, nullptr, nullptr} /* this array must be nullptr terminated */
};
-s_mpi_coll_description_t mpi_coll_scatter_description[] = { {"default", "scatter default collective",
- reinterpret_cast<void*>(&smpi_mpi_scatter)}, COLL_SCATTERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
+s_mpi_coll_description_t mpi_coll_scatter_description[] ={COLL_SCATTERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
-s_mpi_coll_description_t mpi_coll_barrier_description[] = { {"default", "barrier default collective",
- reinterpret_cast<void*>(&smpi_mpi_barrier)}, COLL_BARRIERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
+s_mpi_coll_description_t mpi_coll_barrier_description[] ={COLL_BARRIERS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
-s_mpi_coll_description_t mpi_coll_alltoall_description[] = { {"default", "Ompi alltoall default collective",
- reinterpret_cast<void*>(&smpi_coll_tuned_alltoall_ompi2)}, COLL_ALLTOALLS(COLL_DESCRIPTION, COLL_COMMA),
- {"bruck", "Alltoall Bruck (SG) collective",
- reinterpret_cast<void*>(&smpi_coll_tuned_alltoall_bruck)},
- {"basic_linear", "Alltoall basic linear (SG) collective",
- reinterpret_cast<void*>(&smpi_coll_tuned_alltoall_basic_linear)}, {nullptr, nullptr, nullptr}};
+s_mpi_coll_description_t mpi_coll_alltoall_description[] = {COLL_ALLTOALLS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
-s_mpi_coll_description_t mpi_coll_alltoallv_description[] = { {"default", "Ompi alltoallv default collective",
- reinterpret_cast<void*>(&smpi_coll_basic_alltoallv)}, COLL_ALLTOALLVS(COLL_DESCRIPTION, COLL_COMMA),
+s_mpi_coll_description_t mpi_coll_alltoallv_description[] = {COLL_ALLTOALLVS(COLL_DESCRIPTION, COLL_COMMA),
{nullptr, nullptr, nullptr} /* this array must be nullptr terminated */
};
-s_mpi_coll_description_t mpi_coll_bcast_description[] = { {"default", "bcast default collective ",
- reinterpret_cast<void*>(&smpi_mpi_bcast)}, COLL_BCASTS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
+s_mpi_coll_description_t mpi_coll_bcast_description[] = {COLL_BCASTS(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr}};
-s_mpi_coll_description_t mpi_coll_reduce_description[] = { {"default", "reduce default collective",
- reinterpret_cast<void*>(&smpi_mpi_reduce)}, COLL_REDUCES(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
+s_mpi_coll_description_t mpi_coll_reduce_description[] = {COLL_REDUCES(COLL_DESCRIPTION, COLL_COMMA), {nullptr, nullptr, nullptr} };
printf(" %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 find_coll_description(s_mpi_coll_description_t * table, const char *name, const char *desc)
{
char *name_list = nullptr;
int selector_on=0;
if(selector_on){
// collective seems not handled by the active selector, try with default one
- name=const_cast<char*>("default");
for (int i = 0; table[i].name; i++)
- if (!strcmp(name, table[i].name)) {
+ if (!strcmp("default", table[i].name)) {
return i;
}
}
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);
void (*smpi_coll_cleanup_callback)();
+namespace simgrid{
+namespace smpi{
+
+int (*Colls::gather)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, int root, MPI_Comm);
+int (*Colls::allgather)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
+int (*Colls::allgatherv)(void *, int, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
+int (*Colls::allreduce)(void *sbuf, void *rbuf, int rcount, MPI_Datatype dtype, MPI_Op op, MPI_Comm comm);
+int (*Colls::alltoall)(void *, int, MPI_Datatype, void*, int, MPI_Datatype, MPI_Comm);
+int (*Colls::alltoallv)(void *, int*, int*, MPI_Datatype, void*, int*, int*, MPI_Datatype, MPI_Comm);
+int (*Colls::bcast)(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm com);
+int (*Colls::reduce)(void *buf, void *rbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm);
+int (*Colls::reduce_scatter)(void *sbuf, void *rbuf, int *rcounts,MPI_Datatype dtype,MPI_Op op,MPI_Comm comm);
+int (*Colls::scatter)(void *sendbuf, int sendcount, MPI_Datatype sendtype,void *recvbuf, int recvcount, MPI_Datatype recvtype,int root, MPI_Comm comm);
+int (*Colls::barrier)(MPI_Comm comm);
+
+
+#define COLL_SETTER(cat, ret, args, args2)\
+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);\
+}
+
+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 = xbt_cfg_get_string("smpi/gather");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_gather(name);
+
+ name = xbt_cfg_get_string("smpi/allgather");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_allgather(name);
+
+ name = xbt_cfg_get_string("smpi/allgatherv");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_allgatherv(name);
+
+ name = xbt_cfg_get_string("smpi/allreduce");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_allreduce(name);
+
+ name = xbt_cfg_get_string("smpi/alltoall");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_alltoall(name);
+
+ name = xbt_cfg_get_string("smpi/alltoallv");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_alltoallv(name);
+
+ name = xbt_cfg_get_string("smpi/reduce");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_reduce(name);
-int smpi_coll_tuned_alltoall_ompi2(void *sendbuf, int sendcount, MPI_Datatype sendtype, void *recvbuf,
- int recvcount, MPI_Datatype recvtype, MPI_Comm comm)
+ name = xbt_cfg_get_string("smpi/reduce-scatter");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_reduce_scatter(name);
+
+ name = xbt_cfg_get_string("smpi/scatter");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_scatter(name);
+
+ name = xbt_cfg_get_string("smpi/bcast");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_bcast(name);
+
+ name = xbt_cfg_get_string("smpi/barrier");
+ if (name==nullptr || name[0] == '\0')
+ name = selector_name;
+
+ set_barrier(name);
+}
+
+
+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 = smpi_comm_size(comm);
- int 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;
- int 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
- int rank = smpi_comm_rank(comm);
- int 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 */
- int err = smpi_datatype_copy(static_cast<char *>(sendbuf) + rank * sendcount * sendext, sendcount, sendtype,
- static_cast<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) {
- requests[count] = smpi_irecv_init(static_cast<char *>(recvbuf) + i * recvcount * recvext, recvcount,
- recvtype, i, system_tag, comm);
- count++;
- }else{
- XBT_DEBUG("<%d> skip request creation [src = %d, recvcount = %d]", rank, i, recvcount);
- }
+
+ 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) {
- requests[count] = smpi_isend_init(static_cast<char *>(sendbuf) + i * sendcount * sendext, sendcount,
- sendtype, i, system_tag, comm);
- count++;
- }else{
- XBT_DEBUG("<%d> skip request creation [dst = %d, sendcount = %d]", rank, i, sendcount);
+ // 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++;
}
}
- /* 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;
- int count;
- MPI_Aint lb = 0, sendext = 0, recvext = 0;
- MPI_Request *requests;
-
- /* Initialize. */
- int rank = smpi_comm_rank(comm);
- int 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 */
- int err = smpi_datatype_copy(static_cast<char *>(sendbuf) + rank * sendcount * sendext, sendcount, sendtype,
- static_cast<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(static_cast<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(static_cast<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
+ if(op!=MPI_OP_NULL) 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) {
+ 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;
}
-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;
- int count;
- MPI_Aint lb = 0;
- MPI_Aint sendext = 0;
- MPI_Aint recvext = 0;
- MPI_Request *requests;
-
- /* Initialize. */
- int rank = smpi_comm_rank(comm);
- int 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 */
- int err = smpi_datatype_copy(static_cast<char *>(sendbuf) + senddisps[rank] * sendext, sendcounts[rank], sendtype,
- static_cast<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) {
- requests[count] = smpi_irecv_init(static_cast<char *>(recvbuf) + recvdisps[i] * recvext,
- recvcounts[i], recvtype, i, system_tag, comm);
- count++;
- }else{
- XBT_DEBUG("<%d> skip request creation [src = %d, recvcounts[src] = %d]", rank, i, recvcounts[i]);
+ 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;
}
- }
- /* Now create all sends */
- for (i = 0; i < size; ++i) {
- if (i != rank && sendcounts[i] != 0) {
- requests[count] = smpi_isend_init(static_cast<char *>(sendbuf) + senddisps[i] * sendext,
- sendcounts[i], sendtype, i, system_tag, comm);
- count++;
- }else{
- XBT_DEBUG("<%d> skip request creation [dst = %d, sendcounts[dst] = %d]", rank, i, sendcounts[i]);
+ 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
+ if(op!=MPI_OP_NULL) 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) {
+ 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;
+}
+
+}
}
+
+
+
+
+