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