关于MPI_Isend

如何解决关于MPI_Isend

我正在使用MPI库在master和worker之间传递对象数组。由于对象众多,因此我在循环中使用MPI_Isend,然后使用MPI_Recv。除了最后一个MPI_Recv仅在MPI_Recv接收到最后发送的元素MPI_Isent之外,其他所有内容都正常运行,此外,该代码将无任何错误地终止。

发送的输入是:

1 2 3 0.4 0 4 5 1 
2 4 7 0.678 0 8 1
....
5 8 7 0.56 0 6 1

,收到的输入是:

5 8 7 0.56 0 6 1
5 8 7 0.56 0 6 1
5 8 7 0.56 0 6 1
.... (always the same) 

我的问题很简单:为什么?我感觉在MPI传输中有些东西被覆盖了,但是我不知道在哪里以及为什么。我的代码的第一部分似乎还可以,我的问题在最后一部分。

编辑

根据评论,问题在于没有MPI_Waitall()验证完成。我必须承认无法理解在何处插入任何MPI_WaitMPI_Waitall

main.cpp

MPI_Datatype mpi_gene = MPI_Send_Genes();
MPI_Request reqs_6[size_req],reqs_7[size_req]; 
MPI_Status status_7[size_req];

if(rank==0){

    for(int r=1; r < com; r++){
      
      MPI_Isend(&num_orgs,1,MPI_INT,r,parallel_0,&reqs_0[r]);

      for(int org = 0; org < NEAT::pop_size; org++){

        //send some genome information
        genome_info g_info;
        g_info.generation = pop->organisms[org]->generation;
        MPI_Isend(&g_info,mpi_genome_info,org,parallel_1,&reqs_1[org]);

        //define the genome
        NEAT::Genome* sent_genome = pop->organisms[org]->gnome;

        //third the genes
        std::vector<NEAT::Gene*> gen_genes = sent_genome->genes;
        int num_genes = gen_genes.size();
        struct genes sent_genes[num_genes];

        for(int id = 0; id < num_genes; id++){
          if(gen_genes[id]->lnk->linktrait==0){
            sent_genes[id].trait_id = 0;
          }else{
            sent_genes[id].trait_id = gen_genes[id]->lnk->linktrait->trait_id;
          }
          sent_genes[id].in_node_id = gen_genes[id]->lnk->in_node->node_id;
          sent_genes[id].out_node_id = gen_genes[id]->lnk->out_node->node_id;
          sent_genes[id].weight = gen_genes[id]->lnk->weight;
          sent_genes[id].recurrent = gen_genes[id]->lnk->is_recurrent;
          sent_genes[id].innovation_num = gen_genes[id]->innovation_num;
          sent_genes[id].mutation_num = gen_genes[id]->mutation_num;
          sent_genes[id].enable = gen_genes[id]->enable;

          if(id==3){
            std::cout << 
          sent_genes[id].in_node_id << " " <<
          sent_genes[id].out_node_id <<" " <<
          sent_genes[id].weight <<" " <<
          sent_genes[id].recurrent <<" " <<
          sent_genes[id].innovation_num <<" " <<
          sent_genes[id].mutation_num <<" " <<
          sent_genes[id].enable <<" " <<
          std::endl; 
          }
        }

        MPI_Isend(&num_genes,parallel_6,&reqs_6[org]);
        MPI_Isend(&sent_genes,num_genes,mpi_gene,parallel_7,&reqs_7[org]); 
      }
    }
  }
  
  std::cout << "--------------" << std::endl; 

    if(rank!=0){

      std::vector<NEAT::Organism*> local_pop;
      int generation;
      MPI_Recv(&num_orgs,&status);
      
      for(int org = 0; org < num_orgs ; org++){

        //receive genome information
        genome_info rcvd_genome_info;
        MPI_Recv(&rcvd_genome_info,&status);
        generation = rcvd_genome_info.generation; 

        //receive genes 
        int num_rcvd_genes;
        MPI_Recv(&num_rcvd_genes,&status);
        genes rcvd_genes[num_rcvd_genes];
        MPI_Recv(&rcvd_genes,num_rcvd_genes,&status);
        MPI_Waitall(size_req,&reqs_7[size_req],MPI_STATUSES_IGNORE);
        std::cout << num_rcvd_genes << std::endl; //this is ok
        std::vector<NEAT::Gene*> gen_genes;
        for(int id = 0; id < num_rcvd_genes; id++){
          genes p_gene = rcvd_genes[id];

          if(id==3){//PROBLEM HERE
            std::cout << id << " <- "<<
            p_gene.in_node_id << " " <<
            p_gene.out_node_id <<" " <<
            p_gene.weight <<" " <<
            p_gene.recurrent <<" " <<
            p_gene.innovation_num <<" " <<
            p_gene.mutation_num <<" " <<
            p_gene.enable <<" " <<
            std::endl; 
          }
        }
      }
      MPI_Waitall(size_req,MPI_STATUSES_IGNORE);
    }

send_genes.cpp

MPI_Datatype MPI_Send_Genes(){

  int nitems = 8;
  int gene_blocklengths[nitems] = {1,1};
  MPI_Datatype gene_types[nitems] = {MPI_INT,MPI_DOUBLE,MPI_C_BOOL,MPI_C_BOOL};
  MPI_Datatype mpi_gene;
  MPI_Aint gene_offsets[nitems];

  gene_offsets[0] = offsetof(genes,trait_id);
  gene_offsets[1] = offsetof(genes,in_node_id);
  gene_offsets[2] = offsetof(genes,out_node_id);
  gene_offsets[3] = offsetof(genes,weight);
  gene_offsets[4] = offsetof(genes,recurrent);
  gene_offsets[5] = offsetof(genes,innovation_num);
  gene_offsets[6] = offsetof(genes,mutation_num);
  gene_offsets[7] = offsetof(genes,enable);

  MPI_Type_create_struct(nitems,gene_blocklengths,gene_offsets,gene_types,&mpi_gene);
  MPI_Type_commit(&mpi_gene);

  return mpi_gene;   
}

send_genes.h

struct genes{
  int trait_id;
  int in_node_id;
  int out_node_id;
  double weight;
  bool recurrent;
  double innovation_num;
  double mutation_num;
  bool enable;
};

解决方法

由于Hristo Iliev和Gilles Gouaillardet的提示,我注意到我并不能确保每个请求都已正确发起和发送。如果我的理解是正确的,我只需要在每个memcpy之后添加一个MPI_Wait,就可以正常使用了。但是,我必须承认仍然不理解为什么仅复制和发送最后一个值。

MPI_Isend

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