src/smpi/smpi_base.c

   1 #include "private.h"
   2
   3 smpi_mpi_global_t smpi_mpi_global = NULL;
   4
   5 void smpi_mpi_land_func(void *x, void *y, void *z);
   6
   7 void smpi_mpi_land_func(void *x, void *y, void *z)
   8 {
   9         *(int *)z = *(int *)x && *(int *)y;
  10 }
  11
  12 void smpi_mpi_sum_func(void *x, void *y, void *z);
  13
  14 void smpi_mpi_sum_func(void *x, void *y, void *z)
  15 {
  16         *(int *)z = *(int *)x + *(int *)y;
  17 }
  18
  19 int inline smpi_mpi_comm_size(smpi_mpi_communicator_t comm, int *size)
  20 {
  21         int retval = MPI_SUCCESS;
  22         if (NULL == size) {
  23                 retval = MPI_ERR_ARG;
  24         } else {
  25                 *size = comm->size;
  26         }
  27         return retval;
  28 }
  29
  30 // FIXME: smarter algorithm?
  31 int smpi_mpi_comm_rank(smpi_mpi_communicator_t comm, int *rank)
  32 {
  33         int i;
  34         int retval = MPI_SUCCESS;
  35
  36         if (NULL == rank) {
  37                 retval = MPI_ERR_ARG;
  38         } else {
  39                 smx_host_t host = SIMIX_host_self();
  40
  41                 for (i = 0; i < comm->size && host != smpi_global->hosts[comm->rank_to_index_map[i]]; i++);
  42
  43                 *rank = i;
  44         }
  45
  46         return retval;
  47 }
  48
  49 void smpi_mpi_init()
  50 {
  51         smx_host_t host;
  52         smx_host_t *hosts;
  53         int host_count;
  54         int i;
  55
  56         SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
  57         smpi_global->running_hosts_count++;
  58         SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
  59
  60         // initialize some local variables
  61         host       = SIMIX_host_self();
  62         hosts      = SIMIX_host_get_table();
  63         host_count = SIMIX_host_get_number();
  64
  65         // node 0 sets the globals
  66         if (host == hosts[0]) {
  67
  68                 smpi_global->hosts                              = hosts;
  69                 smpi_global->host_count                         = host_count;
  70
  71                 smpi_mpi_global                                 = xbt_new(s_smpi_mpi_global_t, 1);
  72
  73                 // global communicator
  74                 smpi_mpi_global->mpi_comm_world                 = xbt_new(s_smpi_mpi_communicator_t, 1);
  75                 smpi_mpi_global->mpi_comm_world->size           = host_count;
  76                 smpi_mpi_global->mpi_comm_world->barrier_count  = 0;
  77                 smpi_mpi_global->mpi_comm_world->barrier_mutex  = SIMIX_mutex_init();
  78                 smpi_mpi_global->mpi_comm_world->barrier_cond   = SIMIX_cond_init();
  79                 smpi_mpi_global->mpi_comm_world->rank_to_index_map = xbt_new(int, host_count);
  80                 smpi_mpi_global->mpi_comm_world->index_to_rank_map = xbt_new(int, host_count);
  81                 for (i = 0; i < host_count; i++) {
  82                         smpi_mpi_global->mpi_comm_world->rank_to_index_map[i] = i;
  83                         smpi_mpi_global->mpi_comm_world->index_to_rank_map[i] = i;
  84                 }
  85
  86                 // mpi datatypes
  87                 smpi_mpi_global->mpi_byte                       = xbt_new(s_smpi_mpi_datatype_t, 1);
  88                 smpi_mpi_global->mpi_byte->size                 = (size_t)1;
  89                 smpi_mpi_global->mpi_int                        = xbt_new(s_smpi_mpi_datatype_t, 1);
  90                 smpi_mpi_global->mpi_int->size                  = sizeof(int);
  91                 smpi_mpi_global->mpi_double                     = xbt_new(s_smpi_mpi_datatype_t, 1);
  92                 smpi_mpi_global->mpi_double->size               = sizeof(double);
  93
  94                 // mpi operations
  95                 smpi_mpi_global->mpi_land                       = xbt_new(s_smpi_mpi_op_t, 1);
  96                 smpi_mpi_global->mpi_land->func                 = smpi_mpi_land_func;
  97                 smpi_mpi_global->mpi_sum                        = xbt_new(s_smpi_mpi_op_t, 1);
  98                 smpi_mpi_global->mpi_sum->func                  = smpi_mpi_sum_func;
  99
 100                 // signal all nodes to perform initialization
 101                 SIMIX_mutex_lock(smpi_global->start_stop_mutex);
 102                 smpi_global->root_ready = 1;
 103                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
 104                 SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
 105
 106         } else {
 107
 108                 // make sure root is done before own initialization
 109                 SIMIX_mutex_lock(smpi_global->start_stop_mutex);
 110                 if (!smpi_global->root_ready) {
 111                         SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
 112                 }
 113                 SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
 114
 115         }
 116
 117         // wait for all nodes to signal initializatin complete
 118         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
 119         smpi_global->ready_process_count++;
 120         if (smpi_global->ready_process_count < 3 * host_count) {
 121                 SIMIX_cond_wait(smpi_global->start_stop_cond, smpi_global->start_stop_mutex);
 122         } else {
 123                 SIMIX_cond_broadcast(smpi_global->start_stop_cond);
 124         }
 125         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
 126
 127         return;
 128 }
 129
 130 void smpi_mpi_finalize()
 131 {
 132         int i;
 133
 134         SIMIX_mutex_lock(smpi_global->running_hosts_count_mutex);
 135         i = --smpi_global->running_hosts_count;
 136         SIMIX_mutex_unlock(smpi_global->running_hosts_count_mutex);
 137
 138         SIMIX_mutex_lock(smpi_global->start_stop_mutex);
 139         smpi_global->ready_process_count--;
 140         SIMIX_mutex_unlock(smpi_global->start_stop_mutex);
 141
 142         if (0 >= i) {
 143
 144                 // wake up senders/receivers
 145                 for (i = 0; i < smpi_global->host_count; i++) {
 146                         if (SIMIX_process_is_suspended(smpi_global->sender_processes[i])) {
 147                                 SIMIX_process_resume(smpi_global->sender_processes[i]);
 148                         }
 149                         if (SIMIX_process_is_suspended(smpi_global->receiver_processes[i])) {
 150                                 SIMIX_process_resume(smpi_global->receiver_processes[i]);
 151                         }
 152                 }
 153
 154                 SIMIX_mutex_destroy(smpi_mpi_global->mpi_comm_world->barrier_mutex);
 155                 SIMIX_cond_destroy(smpi_mpi_global->mpi_comm_world->barrier_cond);
 156                 xbt_free(smpi_mpi_global->mpi_comm_world);
 157
 158                 xbt_free(smpi_mpi_global->mpi_byte);
 159                 xbt_free(smpi_mpi_global->mpi_int);
 160                 xbt_free(smpi_mpi_global->mpi_double);
 161
 162                 xbt_free(smpi_mpi_global->mpi_land);
 163                 xbt_free(smpi_mpi_global->mpi_sum);
 164
 165                 xbt_free(smpi_mpi_global);
 166
 167         }
 168
 169 }
 170
 171 int smpi_mpi_barrier(smpi_mpi_communicator_t comm)
 172 {
 173
 174         SIMIX_mutex_lock(comm->barrier_mutex);
 175         if(++comm->barrier_count < comm->size) {
 176                 SIMIX_cond_wait(comm->barrier_cond, comm->barrier_mutex);
 177         } else {
 178                 comm->barrier_count = 0;
 179                 SIMIX_cond_broadcast(comm->barrier_cond);
 180         }
 181         SIMIX_mutex_unlock(comm->barrier_mutex);
 182
 183         return MPI_SUCCESS;
 184 }
 185
 186 int smpi_mpi_isend(smpi_mpi_request_t request)
 187 {
 188         int retval = MPI_SUCCESS;
 189         int index  = smpi_host_index();
 190
 191         if (NULL == request) {
 192                 retval = MPI_ERR_INTERN;
 193         } else {
 194                 SIMIX_mutex_lock(smpi_global->pending_send_request_queues_mutexes[index]);
 195                 xbt_fifo_push(smpi_global->pending_send_request_queues[index], request);
 196                 SIMIX_mutex_unlock(smpi_global->pending_send_request_queues_mutexes[index]);
 197
 198                 if (SIMIX_process_is_suspended(smpi_global->sender_processes[index])) {
 199                         SIMIX_process_resume(smpi_global->sender_processes[index]);
 200                 }
 201         }
 202
 203         return retval;
 204 }
 205
 206 int smpi_mpi_irecv(smpi_mpi_request_t request)
 207 {
 208         int retval = MPI_SUCCESS;
 209         int index = smpi_host_index();
 210
 211         if (NULL == request) {
 212                 retval = MPI_ERR_INTERN;
 213         } else {
 214                 SIMIX_mutex_lock(smpi_global->pending_recv_request_queues_mutexes[index]);
 215                 xbt_fifo_push(smpi_global->pending_recv_request_queues[index], request);
 216                 SIMIX_mutex_unlock(smpi_global->pending_recv_request_queues_mutexes[index]);
 217
 218                 if (SIMIX_process_is_suspended(smpi_global->receiver_processes[index])) {
 219                         SIMIX_process_resume(smpi_global->receiver_processes[index]);
 220                 }
 221         }
 222
 223         return retval;
 224 }
 225
 226 int smpi_mpi_wait(smpi_mpi_request_t request, smpi_mpi_status_t *status)
 227 {
 228         int retval = MPI_SUCCESS;
 229
 230         if (NULL == request) {
 231                 retval = MPI_ERR_INTERN;
 232         } else {
 233                 SIMIX_mutex_lock(request->mutex);
 234                 if (!request->completed) {
 235                         SIMIX_cond_wait(request->cond, request->mutex);
 236                 }
 237                 if (NULL != status) {
 238                         status->MPI_SOURCE = request->src;
 239                         status->MPI_TAG    = request->tag;
 240                         status->MPI_ERROR  = MPI_SUCCESS;
 241                 }
 242                 SIMIX_mutex_unlock(request->mutex);
 243         }
 244
 245         return retval;
 246 }