-// FIXME: remove
-#include <stdio.h>
+
+
#include "private.h"
+#include "smpi_coll_private.h"
-int MPI_Init(int *argc, char ***argv)
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(smpi_mpi, smpi,
+ "Logging specific to SMPI (mpi)");
+
+int SMPI_MPI_Init(int *argc, char ***argv)
{
- smpi_mpi_init();
- smpi_bench_begin();
- return MPI_SUCCESS;
+ smpi_process_init(argc, argv);
+ smpi_bench_begin();
+ return MPI_SUCCESS;
}
-int MPI_Finalize()
+int SMPI_MPI_Finalize()
{
- smpi_bench_end();
- smpi_mpi_finalize();
- return MPI_SUCCESS;
+ smpi_bench_end();
+ smpi_process_finalize();
+ return MPI_SUCCESS;
}
// right now this just exits the current node, should send abort signal to all
-// hosts in the communicator;
-int MPI_Abort(MPI_Comm comm, int errorcode)
+// hosts in the communicator (TODO)
+int SMPI_MPI_Abort(MPI_Comm comm, int errorcode)
{
- smpi_exit(errorcode);
- return 0;
+ smpi_exit(errorcode);
+ return 0;
}
-int MPI_Comm_size(MPI_Comm comm, int *size)
+int SMPI_MPI_Comm_size(MPI_Comm comm, int *size)
{
- int retval = MPI_SUCCESS;
+ int retval = MPI_SUCCESS;
- smpi_bench_end();
+ smpi_bench_end();
- if (NULL == comm) {
- retval = MPI_ERR_COMM;
- } else if (NULL == size) {
- retval = MPI_ERR_ARG;
- } else {
- *size = comm->size;
- }
+ if (NULL == comm) {
+ retval = MPI_ERR_COMM;
+ } else if (NULL == size) {
+ retval = MPI_ERR_ARG;
+ } else {
+ *size = comm->size;
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
}
-int MPI_Comm_rank(MPI_Comm comm, int *rank)
+int SMPI_MPI_Comm_rank(MPI_Comm comm, int *rank)
{
- int retval = MPI_SUCCESS;
+ int retval = MPI_SUCCESS;
- smpi_bench_end();
+ smpi_bench_end();
- if (NULL == comm) {
- retval = MPI_ERR_COMM;
- } else if (NULL == rank) {
- retval = MPI_ERR_ARG;
- } else {
- *rank = smpi_mpi_comm_rank(comm);
- }
+ if (NULL == comm) {
+ retval = MPI_ERR_COMM;
+ } else if (NULL == rank) {
+ retval = MPI_ERR_ARG;
+ } else {
+ *rank = smpi_mpi_comm_rank(comm);
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
}
-int MPI_Type_size(MPI_Datatype datatype, size_t *size)
+int SMPI_MPI_Type_size(MPI_Datatype datatype, size_t * size)
{
- int retval = MPI_SUCCESS;
+ int retval = MPI_SUCCESS;
- smpi_bench_end();
+ smpi_bench_end();
- if (NULL == datatype) {
- retval = MPI_ERR_TYPE;
- } else if (NULL == size) {
- retval = MPI_ERR_ARG;
- } else {
- *size = datatype->size;
- }
+ if (NULL == datatype) {
+ retval = MPI_ERR_TYPE;
+ } else if (NULL == size) {
+ retval = MPI_ERR_ARG;
+ } else {
+ *size = datatype->size;
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
}
-int MPI_Barrier(MPI_Comm comm)
+int SMPI_MPI_Barrier(MPI_Comm comm)
{
- int retval = MPI_SUCCESS;
+ int retval = MPI_SUCCESS;
+ int arity=4;
+
+ smpi_bench_end();
- smpi_bench_end();
+ if (NULL == comm) {
+ retval = MPI_ERR_COMM;
+ } else {
- if (NULL == comm) {
- retval = MPI_ERR_COMM;
- } else {
- retval = smpi_mpi_barrier(comm);
- }
+ /*
+ * original implemantation:
+ * retval = smpi_mpi_barrier(comm);
+ * this one is unrealistic: it just cond_waits, means no time.
+ */
+ retval = nary_tree_barrier( comm, arity );
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
}
-int MPI_Irecv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI_Comm comm, MPI_Request *request)
+int SMPI_MPI_Irecv(void *buf, int count, MPI_Datatype datatype, int src,
+ int tag, MPI_Comm comm, MPI_Request * request)
{
- int retval = MPI_SUCCESS;
+ int retval = MPI_SUCCESS;
- smpi_bench_end();
+ smpi_bench_end();
- if (NULL == request) {
- retval = MPI_ERR_ARG;
- } else {
- int dst = 0;
- retval = smpi_create_request(buf, count, datatype, src, dst, tag, comm, request);
- if (NULL != *request && MPI_SUCCESS == retval) {
- retval = smpi_mpi_irecv(*request);
- }
- }
+ retval = smpi_create_request(buf, count, datatype, src, 0, tag, comm,
+ request);
+ if (NULL != *request && MPI_SUCCESS == retval) {
+ retval = smpi_mpi_irecv(*request);
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
}
-int MPI_Recv(void *buf, int count, MPI_Datatype datatype, int src, int tag, MPI_Comm comm, MPI_Status *status)
+int SMPI_MPI_Recv(void *buf, int count, MPI_Datatype datatype, int src,
+ int tag, MPI_Comm comm, MPI_Status * status)
{
- int retval = MPI_SUCCESS;
- int dst = 0;
- smpi_mpi_request_t request;
+ int retval = MPI_SUCCESS;
+ smpi_mpi_request_t request;
- smpi_bench_end();
+ smpi_bench_end();
- retval = smpi_create_request(buf, count, datatype, src, dst, tag, comm, &request);
- if (NULL != request && MPI_SUCCESS == retval) {
- retval = smpi_mpi_irecv(request);
- if (MPI_SUCCESS == retval) {
- retval = smpi_mpi_wait(request, status);
- }
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- }
+ retval = smpi_create_request(buf, count, datatype, src, 0, tag, comm,
+ &request);
+ if (NULL != request && MPI_SUCCESS == retval) {
+ retval = smpi_mpi_irecv(request);
+ if (MPI_SUCCESS == retval) {
+ retval = smpi_mpi_wait(request, status);
+ }
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
}
-int MPI_Isend(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MPI_Comm comm, MPI_Request *request)
+int SMPI_MPI_Isend(void *buf, int count, MPI_Datatype datatype, int dst,
+ int tag, MPI_Comm comm, MPI_Request * request)
{
- int retval = MPI_SUCCESS;
+ int retval = MPI_SUCCESS;
- smpi_bench_end();
+ smpi_bench_end();
- if (NULL == request) {
- retval = MPI_ERR_ARG;
- } else {
- int src = 0;
- retval = smpi_create_request(buf, count, datatype, src, dst, tag, comm, request);
- if (NULL != *request && MPI_SUCCESS == retval) {
- retval = smpi_mpi_isend(*request);
- }
- }
+ retval = smpi_create_request(buf, count, datatype, 0, dst, tag, comm,
+ request);
+ if (NULL != *request && MPI_SUCCESS == retval) {
+ retval = smpi_mpi_isend(*request);
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
}
-int MPI_Send(void *buf, int count, MPI_Datatype datatype, int dst, int tag, MPI_Comm comm)
+int SMPI_MPI_Send(void *buf, int count, MPI_Datatype datatype, int dst,
+ int tag, MPI_Comm comm)
{
- int retval = MPI_SUCCESS;
- int src = 0;
- smpi_mpi_request_t request;
+ int retval = MPI_SUCCESS;
+ smpi_mpi_request_t request;
- smpi_bench_end();
+ smpi_bench_end();
- retval = smpi_create_request(buf, count, datatype, src, dst, tag, comm, &request);
- if (NULL != request && MPI_SUCCESS == retval) {
- retval = smpi_mpi_isend(request);
- if (MPI_SUCCESS == retval) {
- smpi_mpi_wait(request, MPI_STATUS_IGNORE);
- }
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- }
+ retval = smpi_create_request(buf, count, datatype, 0, dst, tag, comm,
+ &request);
+ if (NULL != request && MPI_SUCCESS == retval) {
+ retval = smpi_mpi_isend(request);
+ if (MPI_SUCCESS == retval) {
+ smpi_mpi_wait(request, MPI_STATUS_IGNORE);
+ }
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ }
- smpi_bench_begin();
+ smpi_bench_begin();
- return retval;
+ return retval;
+}
+
+/**
+ * MPI_Wait and friends
+ **/
+int SMPI_MPI_Wait(MPI_Request * request, MPI_Status * status)
+{
+ return smpi_mpi_wait(*request, status);
}
-// FIXME: overly simplistic
-int MPI_Bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm comm) {
+int SMPI_MPI_Waitall(int count, MPI_Request requests[], MPI_Status status[])
+{
+ return smpi_mpi_waitall(count, requests, status);
+}
- int retval = MPI_SUCCESS;
- int rank;
- smpi_mpi_request_t request;
+int SMPI_MPI_Waitany(int count, MPI_Request requests[], int *index,
+ MPI_Status status[])
+{
+ return smpi_mpi_waitany(count, requests, index, status);
+}
- smpi_bench_end();
+/**
+ * MPI_Bcast
+ **/
- rank = smpi_mpi_comm_rank(comm);
+/**
+ * flat bcast
+ **/
+int flat_tree_bcast(void *buf, int count, MPI_Datatype datatype, int root, MPI_Comm comm);
+int flat_tree_bcast(void *buf, int count, MPI_Datatype datatype, int root,
+ MPI_Comm comm)
+{
+ int rank;
+ int retval = MPI_SUCCESS;
+ smpi_mpi_request_t request;
+
+ rank = smpi_mpi_comm_rank(comm);
+ if (rank == root) {
+ retval = smpi_create_request(buf, count, datatype, root,
+ (root + 1) % comm->size, 0, comm, &request);
+ request->forward = comm->size - 1;
+ smpi_mpi_isend(request);
+ } else {
+ retval = smpi_create_request(buf, count, datatype, MPI_ANY_SOURCE, rank,
+ 0, comm, &request);
+ smpi_mpi_irecv(request);
+ }
+
+ smpi_mpi_wait(request, MPI_STATUS_IGNORE);
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+
+ return(retval);
- if (rank == root) {
- retval = smpi_create_request(buf, count, datatype, root, (root + 1) % comm->size, 0, comm, &request);
- request->forward = comm->size - 1;
- smpi_mpi_isend(request);
- smpi_mpi_wait(request, MPI_STATUS_IGNORE);
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- } else {
- retval = smpi_create_request(buf, count, datatype, MPI_ANY_SOURCE, rank, 0, comm, &request);
- smpi_mpi_irecv(request);
- smpi_mpi_wait(request, MPI_STATUS_IGNORE);
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- }
+}
- smpi_bench_begin();
+/**
+ * Bcast user entry point
+ **/
+int SMPI_MPI_Bcast(void *buf, int count, MPI_Datatype datatype, int root,
+ MPI_Comm comm)
+{
+ int retval = MPI_SUCCESS;
- return retval;
+ smpi_bench_end();
+
+ //retval = flat_tree_bcast(buf, count, datatype, root, comm);
+ retval = nary_tree_bcast(buf, count, datatype, root, comm, 2 );
+
+ smpi_bench_begin();
+
+ return retval;
}
-// FIXME: needs to return null in event of MPI_UNDEFINED color...
-// FIXME: seriously, this isn't pretty
-int MPI_Comm_split(MPI_Comm comm, int color, int key, MPI_Comm *comm_out)
+
+
+#ifdef DEBUG_REDUCE
+/**
+ * debugging helper function
+ **/
+static void print_buffer_int(void *buf, int len, const char *msg, int rank)
{
- int retval = MPI_SUCCESS;
-
- int index, rank;
- smpi_mpi_request_t request;
- int colorkey[2];
- smpi_mpi_status_t status;
-
- smpi_bench_end();
-
- // FIXME: need to test parameters
-
- index = smpi_host_index();
- rank = comm->index_to_rank_map[index];
-
- if (0 == rank) {
- int *colors = xbt_new(int, comm->size);
- int *keys = xbt_new(int, comm->size);
- int i, j, k;
- smpi_mpi_communicator_t tempcomm = NULL;
- int colortmp;
- int keycount;
- int *keystmp = xbt_new(int, comm->size);
- int *rankstmp = xbt_new(int, comm->size);
- int tmpval;
- int indextmp;
-
- colors[0] = color;
- keys[0] = key;
-
- // FIXME: not efficient
- for (i = 1; i < comm->size; i++) {
- retval = smpi_create_request(colorkey, 2, MPI_INT, MPI_ANY_SOURCE, rank, MPI_ANY_TAG, comm, &request);
- smpi_mpi_irecv(request);
- smpi_mpi_wait(request, &status);
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- colors[i] = colorkey[0];
- keys[i] = colorkey[1];
- }
-
- for (i = 0; i < comm->size; i++) {
- if (-1 == colors[i]) {
- continue;
- }
- colortmp = colors[i];
- keycount = 0;
- for (j = i; j < comm->size; j++) {
- if(colortmp == colors[j]) {
- colors[j] = -1;
- keystmp[keycount] = keys[j];
- rankstmp[keycount] = j;
- keycount++;
- }
+ int tmp, *v;
+ printf("**[%d] %s: ", rank, msg);
+ for (tmp = 0; tmp < len; tmp++) {
+ v = buf;
+ printf("[%d]", v[tmp]);
+ }
+ printf("\n");
+ free(msg);
+}
+#endif
+
+/**
+ * MPI_Reduce
+ **/
+int SMPI_MPI_Reduce(void *sendbuf, void *recvbuf, int count,
+ MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm)
+{
+ int retval = MPI_SUCCESS;
+ int rank;
+ int size;
+ int i;
+ int tag = 0;
+ smpi_mpi_request_t *requests;
+ smpi_mpi_request_t request;
+
+ smpi_bench_end();
+
+ rank = smpi_mpi_comm_rank(comm);
+ size = comm->size;
+
+ if (rank != root) { // if i am not ROOT, simply send my buffer to root
+
+#ifdef DEBUG_REDUCE
+ print_buffer_int(sendbuf, count, xbt_strdup("sndbuf"), rank);
+#endif
+ retval =
+ smpi_create_request(sendbuf, count, datatype, rank, root, tag, comm,
+ &request);
+ smpi_mpi_isend(request);
+ smpi_mpi_wait(request, MPI_STATUS_IGNORE);
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+
+ } else {
+ // i am the ROOT: wait for all buffers by creating one request by sender
+ int src;
+ requests = xbt_malloc((size-1) * sizeof(smpi_mpi_request_t));
+
+ void **tmpbufs = xbt_malloc((size-1) * sizeof(void *));
+ for (i = 0; i < size-1; i++) {
+ // we need 1 buffer per request to store intermediate receptions
+ tmpbufs[i] = xbt_malloc(count * datatype->size);
+ }
+ // root: initiliaze recv buf with my own snd buf
+ memcpy(recvbuf, sendbuf, count * datatype->size * sizeof(char));
+
+ // i can not use: 'request->forward = size-1;' (which would progagate size-1 receive reqs)
+ // since we should op values as soon as one receiving request matches.
+ for (i = 0; i < size-1; i++) {
+ // reminder: for smpi_create_request() the src is always the process sending.
+ src = i < root ? i : i + 1;
+ retval = smpi_create_request(tmpbufs[i], count, datatype,
+ src, root, tag, comm, &(requests[i]));
+ if (NULL != requests[i] && MPI_SUCCESS == retval) {
+ if (MPI_SUCCESS == retval) {
+ smpi_mpi_irecv(requests[i]);
+ }
+ }
+ }
+ // now, wait for completion of all irecv's.
+ for (i = 0; i < size-1; i++) {
+ int index = MPI_UNDEFINED;
+ smpi_mpi_waitany( size-1, requests, &index, MPI_STATUS_IGNORE);
+#ifdef DEBUG_REDUCE
+ printf ("MPI_Waitany() unblocked: root received (completes req[index=%d])\n",index);
+ print_buffer_int(tmpbufs[index], count, bprintf("tmpbufs[index=%d] (value received)", index),
+ rank);
+#endif
+
+ // arg 2 is modified
+ op->func(tmpbufs[index], recvbuf, &count, &datatype);
+#ifdef DEBUG_REDUCE
+ print_buffer_int(recvbuf, count, xbt_strdup("rcvbuf"), rank);
+#endif
+ xbt_free(tmpbufs[index]);
+ /* FIXME: with the following line, it generates an
+ * [xbt_ex/CRITICAL] Conditional list not empty 162518800.
+ */
+ // xbt_mallocator_release(smpi_global->request_mallocator, requests[index]);
+ }
+ xbt_free(requests);
+ xbt_free(tmpbufs);
+ }
+ smpi_bench_begin();
+ return retval;
+}
+
+/**
+ * MPI_Allreduce
+ *
+ * Same as MPI_REDUCE except that the result appears in the receive buffer of all the group members.
+ **/
+int SMPI_MPI_Allreduce( void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
+ MPI_Op op, MPI_Comm comm );
+int SMPI_MPI_Allreduce( void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype,
+ MPI_Op op, MPI_Comm comm )
+{
+ int retval = MPI_SUCCESS;
+ int root=1; // arbitrary choice
+
+ smpi_bench_end();
+
+ retval = SMPI_MPI_Reduce( sendbuf, recvbuf, count, datatype, op, root, comm);
+ if (MPI_SUCCESS != retval)
+ return(retval);
+
+ retval = SMPI_MPI_Bcast( sendbuf, count, datatype, root, comm);
+ smpi_bench_begin();
+ return( retval );
+}
+
+
+/**
+ * MPI_Scatter user entry point
+ **/
+//int SMPI_MPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype datatype,
+// void *recvbuf, int recvcount, MPI_Datatype recvtype,int root,
+// MPI_Comm comm);
+int SMPI_MPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype datatype,
+ void *recvbuf, int recvcount, MPI_Datatype recvtype,
+ int root, MPI_Comm comm)
+{
+ int retval = MPI_SUCCESS;
+ int i;
+ int cnt=0;
+ int rank;
+ int tag=0;
+ char *cbuf; // to manipulate the void * buffers
+ smpi_mpi_request_t *requests;
+ smpi_mpi_request_t request;
+ smpi_mpi_status_t status;
+
+
+ smpi_bench_end();
+
+ rank = smpi_mpi_comm_rank(comm);
+
+ requests = xbt_malloc((comm->size-1) * sizeof(smpi_mpi_request_t));
+ if (rank == root) {
+ // i am the root: distribute my sendbuf
+ for (i=0; i < comm->size; i++) {
+ cbuf = sendbuf;
+ cbuf += i*sendcount*datatype->size;
+ if ( i!=root ) { // send to processes ...
+
+ retval = smpi_create_request((void *)cbuf, sendcount,
+ datatype, root, i, tag, comm, &(requests[cnt++]));
+ if (NULL != requests[cnt] && MPI_SUCCESS == retval) {
+ if (MPI_SUCCESS == retval) {
+ smpi_mpi_isend(requests[cnt]);
+ }
+ }
+ cnt++;
+ }
+ else { // ... except if it's me.
+ memcpy(recvbuf, (void *)cbuf, recvcount*recvtype->size*sizeof(char));
}
- if (0 < keycount) {
- // FIXME: yes, mock me, bubble sort...
- for (j = 0; j < keycount; j++) {
- for (k = keycount - 1; k > j; k--) {
- if (keystmp[k] < keystmp[k - 1]) {
- tmpval = keystmp[k];
- keystmp[k] = keystmp[k - 1];
- keystmp[k - 1] = tmpval;
-
- tmpval = rankstmp[k];
- rankstmp[k] = rankstmp[k - 1];
- rankstmp[k - 1] = tmpval;
- }
- }
- }
- tempcomm = xbt_new(s_smpi_mpi_communicator_t, 1);
- tempcomm->barrier_count = 0;
- tempcomm->barrier_mutex = SIMIX_mutex_init();
- tempcomm->barrier_cond = SIMIX_cond_init();
- tempcomm->rank_to_index_map = xbt_new(int, keycount);
- tempcomm->index_to_rank_map = xbt_new(int, smpi_global->host_count);
- for (j = 0; j < smpi_global->host_count; j++) {
- tempcomm->index_to_rank_map[j] = -1;
- }
- for (j = 0; j < keycount; j++) {
- indextmp = comm->rank_to_index_map[rankstmp[j]];
- tempcomm->rank_to_index_map[j] = indextmp;
- tempcomm->index_to_rank_map[indextmp] = j;
- }
- for (j = 0; j < keycount; j++) {
- retval = smpi_create_request(&j, 1, MPI_INT, 0, rankstmp[j], 0, comm, &request);
- request->data = tempcomm;
- smpi_mpi_isend(request);
- smpi_mpi_wait(request, &status);
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- }
+ }
+ for(i=0; i<cnt; i++) { // wait for send to complete
+ /* FIXME: waitall() should be slightly better */
+ smpi_mpi_wait(requests[i], &status);
+ xbt_mallocator_release(smpi_global->request_mallocator, requests[i]);
+
+ }
+ }
+ else { // i am a non-root process: wait data from the root
+ retval = smpi_create_request(recvbuf,recvcount,
+ recvtype, root, rank, tag, comm, &request);
+ if (NULL != request && MPI_SUCCESS == retval) {
+ if (MPI_SUCCESS == retval) {
+ smpi_mpi_irecv(request);
}
- }
- } else {
- colorkey[0] = color;
- colorkey[1] = key;
- retval = smpi_create_request(colorkey, 2, MPI_INT, rank, 0, 0, comm, &request);
- smpi_mpi_isend(request);
- smpi_mpi_wait(request, &status);
- xbt_mallocator_release(smpi_global->request_mallocator, request);
- retval = smpi_create_request(colorkey, 1, MPI_INT, 0, rank, 0, comm, &request);
- smpi_mpi_irecv(request);
- smpi_mpi_wait(request, &status);
- *comm_out = request->data;
- }
-
- smpi_bench_begin();
-
- return retval;
+ }
+ smpi_mpi_wait(request, &status);
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ }
+ xbt_free(requests);
+
+ smpi_bench_begin();
+
+ return retval;
}
+
+
+
+
+
+
+// used by comm_split to sort ranks based on key values
+int smpi_compare_rankkeys(const void *a, const void *b);
+int smpi_compare_rankkeys(const void *a, const void *b)
+{
+ int *x = (int *) a;
+ int *y = (int *) b;
+
+ if (x[1] < y[1])
+ return -1;
+
+ if (x[1] == y[1]) {
+ if (x[0] < y[0])
+ return -1;
+ if (x[0] == y[0])
+ return 0;
+ return 1;
+ }
+
+ return 1;
+}
+
+int SMPI_MPI_Comm_split(MPI_Comm comm, int color, int key,
+ MPI_Comm * comm_out)
+{
+ int retval = MPI_SUCCESS;
+
+ int index, rank;
+ smpi_mpi_request_t request;
+ int colorkey[2];
+ smpi_mpi_status_t status;
+
+ smpi_bench_end();
+
+ // FIXME: need to test parameters
+
+ index = smpi_process_index();
+ rank = comm->index_to_rank_map[index];
+
+ // default output
+ comm_out = NULL;
+
+ // root node does most of the real work
+ if (0 == rank) {
+ int colormap[comm->size];
+ int keymap[comm->size];
+ int rankkeymap[comm->size * 2];
+ int i, j;
+ smpi_mpi_communicator_t tempcomm = NULL;
+ int count;
+ int indextmp;
+
+ colormap[0] = color;
+ keymap[0] = key;
+
+ // FIXME: use scatter/gather or similar instead of individual comms
+ for (i = 1; i < comm->size; i++) {
+ retval = smpi_create_request(colorkey, 2, MPI_INT, MPI_ANY_SOURCE,
+ rank, MPI_ANY_TAG, comm, &request);
+ smpi_mpi_irecv(request);
+ smpi_mpi_wait(request, &status);
+ colormap[status.MPI_SOURCE] = colorkey[0];
+ keymap[status.MPI_SOURCE] = colorkey[1];
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ }
+
+ for (i = 0; i < comm->size; i++) {
+ if (MPI_UNDEFINED == colormap[i]) {
+ continue;
+ }
+ // make a list of nodes with current color and sort by keys
+ count = 0;
+ for (j = i; j < comm->size; j++) {
+ if (colormap[i] == colormap[j]) {
+ colormap[j] = MPI_UNDEFINED;
+ rankkeymap[count * 2] = j;
+ rankkeymap[count * 2 + 1] = keymap[j];
+ count++;
+ }
+ }
+ qsort(rankkeymap, count, sizeof(int) * 2, &smpi_compare_rankkeys);
+
+ // new communicator
+ tempcomm = xbt_new(s_smpi_mpi_communicator_t, 1);
+ tempcomm->barrier_count = 0;
+ tempcomm->size = count;
+ tempcomm->barrier_mutex = SIMIX_mutex_init();
+ tempcomm->barrier_cond = SIMIX_cond_init();
+ tempcomm->rank_to_index_map = xbt_new(int, count);
+ tempcomm->index_to_rank_map = xbt_new(int, smpi_global->process_count);
+ for (j = 0; j < smpi_global->process_count; j++) {
+ tempcomm->index_to_rank_map[j] = -1;
+ }
+ for (j = 0; j < count; j++) {
+ indextmp = comm->rank_to_index_map[rankkeymap[j * 2]];
+ tempcomm->rank_to_index_map[j] = indextmp;
+ tempcomm->index_to_rank_map[indextmp] = j;
+ }
+ for (j = 0; j < count; j++) {
+ if (rankkeymap[j * 2]) {
+ retval = smpi_create_request(&j, 1, MPI_INT, 0,
+ rankkeymap[j * 2], 0, comm, &request);
+ request->data = tempcomm;
+ smpi_mpi_isend(request);
+ smpi_mpi_wait(request, &status);
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ } else {
+ *comm_out = tempcomm;
+ }
+ }
+ }
+ } else {
+ colorkey[0] = color;
+ colorkey[1] = key;
+ retval = smpi_create_request(colorkey, 2, MPI_INT, rank, 0, 0, comm,
+ &request);
+ smpi_mpi_isend(request);
+ smpi_mpi_wait(request, &status);
+ xbt_mallocator_release(smpi_global->request_mallocator, request);
+ if (MPI_UNDEFINED != color) {
+ retval = smpi_create_request(colorkey, 1, MPI_INT, 0, rank, 0, comm,
+ &request);
+ smpi_mpi_irecv(request);
+ smpi_mpi_wait(request, &status);
+ *comm_out = request->data;
+ }
+ }
+
+ smpi_bench_begin();
+
+ return retval;
+}
+
+double SMPI_MPI_Wtime(void)
+{
+ return (SIMIX_get_clock());
+}
+
+
