X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/727c068cd59669e79c6779f9ff93ec4ac91f7522..a2f1b23687f04169144f4ffb4f20dc4fc5c28395:/src/smpi/colls/allreduce-smp-rsag.c

diff --git a/src/smpi/colls/allreduce-smp-rsag.c b/src/smpi/colls/allreduce-smp-rsag.c
new file mode 100644
index 0000000000..a40f18979d
--- /dev/null
+++ b/src/smpi/colls/allreduce-smp-rsag.c
@@ -0,0 +1,224 @@
+#include "colls.h"
+
+/* change number of core per smp-node
+   we assume that number of core per process will be the same for all implementations */
+#ifndef NUM_CORE
+#define NUM_CORE 8
+#endif
+
+/*
+This fucntion performs all-reduce operation as follow.
+1) binomial_tree reduce inside each SMP node
+2) reduce-scatter -inter between root of each SMP node
+3) allgather - inter between root of each SMP node
+4) binomial_tree bcast inside each SMP node
+*/
+int smpi_coll_tuned_allreduce_smp_rsag(void *send_buf, void *recv_buf,
+                                       int count, MPI_Datatype dtype, MPI_Op op,
+                                       MPI_Comm comm)
+{
+  int comm_size, rank;
+  void *tmp_buf;
+  int tag = 50;
+  int mask, src, dst;
+  MPI_Status status;
+  int num_core = NUM_CORE;
+  /*
+     #ifdef MPICH2_REDUCTION
+     MPI_User_function * uop = MPIR_Op_table[op % 16 - 1];
+     #else
+     MPI_User_function *uop;
+     struct MPIR_OP *op_ptr;
+     op_ptr = MPIR_ToPointer(op);
+     uop  = op_ptr->op;
+     #endif
+   */
+  MPI_Comm_size(comm, &comm_size);
+  MPI_Comm_rank(comm, &rank);
+  MPI_Aint extent;
+  MPI_Type_extent(dtype, &extent);
+  tmp_buf = (void *) malloc(count * extent);
+
+  int intra_rank, inter_rank;
+  intra_rank = rank % num_core;
+  inter_rank = rank / num_core;
+
+  //printf("node %d intra_rank = %d, inter_rank = %d\n", rank, intra_rank, inter_rank);
+
+  int inter_comm_size = (comm_size + num_core - 1) / num_core;
+
+  if (!rank) {
+    //printf("intra com size = %d\n",num_core);
+    //printf("inter com size = %d\n",inter_comm_size);
+  }
+
+
+  MPI_Sendrecv(send_buf, count, dtype, rank, tag,
+               recv_buf, count, dtype, rank, tag, comm, &status);
+
+
+  // SMP_binomial_reduce
+  mask = 1;
+  while (mask < num_core) {
+    if ((mask & intra_rank) == 0) {
+      src = (inter_rank * num_core) + (intra_rank | mask);
+      //      if (src < ((inter_rank + 1) * num_core)) {
+      if (src < comm_size) {
+        MPI_Recv(tmp_buf, count, dtype, src, tag, comm, &status);
+        star_reduction(op, tmp_buf, recv_buf, &count, &dtype);
+        //printf("Node %d recv from node %d when mask is %d\n", rank, src, mask);
+      }
+    } else {
+
+      dst = (inter_rank * num_core) + (intra_rank & (~mask));
+      MPI_Send(recv_buf, count, dtype, dst, tag, comm);
+      //printf("Node %d send to node %d when mask is %d\n", rank, dst, mask);
+      break;
+    }
+    mask <<= 1;
+  }
+
+
+
+  // INTER: reduce-scatter
+  if (intra_rank == 0) {
+    int send_offset, recv_offset;
+    int seg_count = count / inter_comm_size;
+    int to = ((inter_rank + 1) % inter_comm_size) * num_core;
+    int from =
+        ((inter_rank + inter_comm_size - 1) % inter_comm_size) * num_core;
+    int i;
+
+    //printf("node %d to %d from %d\n",rank,to,from);
+
+    for (i = 0; i < (inter_comm_size - 1); i++) {
+
+      send_offset =
+          ((inter_rank - 1 - i +
+            inter_comm_size) % inter_comm_size) * seg_count * extent;
+      recv_offset =
+          ((inter_rank - 2 - i +
+            inter_comm_size) % inter_comm_size) * seg_count * extent;
+
+      MPI_Sendrecv((char *) recv_buf + send_offset, seg_count, dtype, to,
+                   tag + i, tmp_buf, seg_count, dtype, from, tag + i, comm,
+                   &status);
+
+      // result is in rbuf
+      star_reduction(op, tmp_buf, (char *) recv_buf + recv_offset, &seg_count,
+                     &dtype);
+    }
+
+    // INTER: allgather
+    for (i = 0; i < (inter_comm_size - 1); i++) {
+
+      send_offset =
+          ((inter_rank - i +
+            inter_comm_size) % inter_comm_size) * seg_count * extent;
+      recv_offset =
+          ((inter_rank - 1 - i +
+            inter_comm_size) % inter_comm_size) * seg_count * extent;
+
+      MPI_Sendrecv((char *) recv_buf + send_offset, seg_count, dtype, to,
+                   tag + i, (char *) recv_buf + recv_offset, seg_count, dtype,
+                   from, tag + i, comm, &status);
+
+    }
+  }
+
+
+
+  /*
+     // INTER_binomial_reduce
+
+     // only root node for each SMP
+     if (intra_rank == 0) {
+
+     mask = 1;
+     while (mask < inter_comm_size) {
+     if ((mask & inter_rank) == 0) {
+     src = (inter_rank | mask) * num_core;
+     if (src < comm_size) {
+     MPI_Recv(tmp_buf, count, dtype, src, tag, comm, &status);
+     (* uop) (tmp_buf, recv_buf, &count, &dtype);
+     //printf("Node %d recv from node %d when mask is %d\n", rank, src, mask);
+     }
+     }
+     else {
+     dst = (inter_rank & (~mask)) * num_core;
+     MPI_Send(recv_buf, count, dtype, dst, tag, comm);
+     //printf("Node %d send to node %d when mask is %d\n", rank, dst, mask);
+     break;
+     }
+     mask <<=1;
+     }
+     }
+   */
+
+  /*
+     // INTER_binomial_bcast
+
+
+     if (intra_rank == 0) {
+     mask = 1;
+     while (mask < inter_comm_size) {
+     if (inter_rank & mask) {
+     src = (inter_rank - mask) * num_core;
+     //printf("Node %d recv from node %d when mask is %d\n", rank, src, mask);
+     MPI_Recv(recv_buf, count, dtype, src, tag, comm, &status);
+     break;
+     }
+     mask <<= 1;
+     }
+
+     mask >>= 1;
+     //printf("My rank = %d my mask = %d\n", rank,mask);
+
+     while (mask > 0) {
+     if (inter_rank < inter_comm_size) {
+     dst = (inter_rank + mask) * num_core;
+     if (dst < comm_size) {
+     //printf("Node %d send to node %d when mask is %d\n", rank, dst, mask);
+     MPI_Send(recv_buf, count, dtype, dst, tag, comm);
+     }
+     }
+     mask >>= 1;
+     }
+     }
+   */
+
+
+  // INTRA_binomial_bcast
+
+  int num_core_in_current_smp = num_core;
+  if (inter_rank == (inter_comm_size - 1)) {
+    num_core_in_current_smp = comm_size - (inter_rank * num_core);
+  }
+  //  printf("Node %d num_core = %d\n",rank, num_core_in_current_smp);
+  mask = 1;
+  while (mask < num_core_in_current_smp) {
+    if (intra_rank & mask) {
+      src = (inter_rank * num_core) + (intra_rank - mask);
+      //printf("Node %d recv from node %d when mask is %d\n", rank, src, mask);
+      MPI_Recv(recv_buf, count, dtype, src, tag, comm, &status);
+      break;
+    }
+    mask <<= 1;
+  }
+
+  mask >>= 1;
+  //printf("My rank = %d my mask = %d\n", rank,mask);
+
+  while (mask > 0) {
+    dst = (inter_rank * num_core) + (intra_rank + mask);
+    if (dst < comm_size) {
+      //printf("Node %d send to node %d when mask is %d\n", rank, dst, mask);
+      MPI_Send(recv_buf, count, dtype, dst, tag, comm);
+    }
+    mask >>= 1;
+  }
+
+
+  free(tmp_buf);
+  return MPI_SUCCESS;
+}