c - 在 MPI 中发送/接收 3D 数组

Question

我有一个计算代码需要传递一些数组

int main()
{
    //...
    //..Allocating many 3D,1D arrays and initializing fixed-value arrays
    //..Initializing  named constants here at compile time         
    //..initializing other constants at run time (not changed during the program runtime)
    //...

    for(int n=0;n<=1000;n++){
        func1(); //Needs some 3D arrays to modify, some fixed-value arrays and lots of constants
        func2(); //Same here
        func3(); //Same here

    }

    //.. Data saving routines
    return 0;
}

我正在考虑像这样将它拆分成一个 MPI 程序

//Allocate all of the arrays
MPI_Comm_rank(MPI_Comm_World,&rank);

if(rank==0){
    //Initialize all of the arrays and named constants
    MPI_Bcast(); //Broadcasting all the constants and fixed-value arrays needed

    MPI_ISend();//Send 3D arrays needed by func1()
    MPI_ISend();//Send 3D arrays needed by func2()
    MPI_ISend();//Send 3D arrays needed by func3()

    MPI_IRecv();//Receive modified 3D arrays from func1()
    MPI_IRecv();//Receive modified 3D arrays from func2()
    MPI_IRecv();//Receive modified 3D arrays from func3()

    MPI_Wait(); //For all responses to come in
}
for(int n=0;n<=1000;n++){
    if(rank==1){
        MPI_Recv();//Receive broadcast of constants and fixed value arraysfrom master
        MPI_IRecv(); //Receive 3D arrays from master
        func1();     //Modify 3D arrays
        MPI_ISend(); //Send modified arrays back to master
    }
    else if(rank==2){
        //Similar code
    }
    else if(rank==3){
       //Similar code
    }
}

MPI_Finalize();

我有两个问题:
1) 除了最初广播的 30 个常量之外，我还传递了大约 300x300x300 个 3D 数组
以及在运行时初始化的多个固定值 3D 数组。会不会像上面这样设计 工作 ？

2) 如何使用 MPI_Datatypes 传递 3D 数组？ C 不支持 3D 数组作为 一流的语言结构

Answer 1

1) 除了您应该像第二个问题中提到的那样正确传递 3D 数组之外，我在这里没有看到任何问题。

2) How to use MPI derived data type for 3D array?