src/smpi/smpi_deployment.cpp

   1 /* Copyright (c) 2004-2014. The SimGrid Team.
   2  * All rights reserved.                                                     */
   3
   4 /* This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the license (GNU LGPL) which comes with this package. */
   6
   7 #include "private.h"
   8 #include "simgrid/msg.h" /* barrier */
   9 #include "xbt/dict.h"
  10 #include "xbt/log.h"
  11 #include "xbt/sysdep.h"
  12
  13 static xbt_dict_t smpi_instances = nullptr;
  14 extern int process_count;
  15 extern int* index_to_process_data;
  16
  17 typedef struct s_smpi_mpi_instance{
  18   const char* name;
  19   int size;
  20   int present_processes;
  21   int index;
  22   MPI_Comm comm_world;
  23   msg_bar_t finalization_barrier;
  24 } s_smpi_mpi_instance_t;
  25
  26 /** \ingroup smpi_simulation
  27  * \brief Registers a running instance of a MPI program.
  28  *
  29  * FIXME : remove MSG from the loop at some point.
  30  * \param name the reference name of the function.
  31  * \param code the main mpi function (must have a int ..(int argc, char *argv[])) prototype
  32  * \param num_processes the size of the instance we want to deploy
  33  */
  34 void SMPI_app_instance_register(const char *name, xbt_main_func_t code, int num_processes)
  35 {
  36   SIMIX_function_register(name, code);
  37
  38   s_smpi_mpi_instance_t* instance = (s_smpi_mpi_instance_t*)xbt_malloc(sizeof(s_smpi_mpi_instance_t));
  39
  40   instance->name = name;
  41   instance->size = num_processes;
  42   instance->present_processes = 0;
  43   instance->index = process_count;
  44   instance->comm_world = MPI_COMM_NULL;
  45   instance->finalization_barrier = MSG_barrier_init(num_processes);
  46
  47   process_count+=num_processes;
  48
  49   if(smpi_instances==nullptr){
  50     smpi_instances = xbt_dict_new_homogeneous(xbt_free_f);
  51   }
  52
  53   xbt_dict_set(smpi_instances, name, (void*)instance, nullptr);
  54 }
  55
  56 //get the index of the process in the process_data array
  57 void smpi_deployment_register_process(const char* instance_id, int rank, int index, MPI_Comm** comm, msg_bar_t* bar)
  58 {
  59
  60   if(smpi_instances==nullptr){//no instance registered, we probably used smpirun.
  61     index_to_process_data[index]=index;
  62     *bar = nullptr;
  63     *comm = nullptr;
  64     return;
  65   }
  66
  67   s_smpi_mpi_instance_t* instance =
  68      static_cast<s_smpi_mpi_instance_t*>(xbt_dict_get_or_null(smpi_instances, instance_id));
  69   xbt_assert(instance, "Error, unknown instance %s", instance_id);
  70
  71   if(instance->comm_world == MPI_COMM_NULL){
  72     MPI_Group group = new simgrid::smpi::Group(instance->size);
  73     instance->comm_world = new simgrid::smpi::Comm(group, nullptr);
  74   }
  75   instance->present_processes++;
  76   index_to_process_data[index]=instance->index+rank;
  77   instance->comm_world->group()->set_mapping(index, rank);
  78   *bar = instance->finalization_barrier;
  79   *comm = &instance->comm_world;
  80 }
  81
  82 void smpi_deployment_cleanup_instances(){
  83   xbt_dict_cursor_t cursor = nullptr;
  84   s_smpi_mpi_instance_t* instance = nullptr;
  85   char *name = nullptr;
  86   xbt_dict_foreach(smpi_instances, cursor, name, instance) {
  87     if(instance->comm_world!=MPI_COMM_NULL)
  88       while (instance->comm_world->group()->unuse() > 0);
  89     delete instance->comm_world;
  90     MSG_barrier_destroy(instance->finalization_barrier);
  91   }
  92   xbt_dict_free(&smpi_instances);
  93 }