MPI从包含具有structs和typedef的结构的结构中创建MPI_Datatype

问题描述

我有一个非常复杂的程序，必须与MPI并行运行.我为此使用MPICH3.

I have a quite complex program which I have to parallel with MPI. I use MPICH3 for this.

我知道制作新MPI_Datatype的方法为:

I know the way to make a new MPI_Datatype as:

  typedef struct{
    float x;
    float y;
    int centroid;
} point;
typedef struct{
    int csize;//the current size
    int tsize;//the total size
    point * data;//the data carried
} ArrayList;

const int nfields=3;
MPI_Aint disps[nfields];
int blocklens[] = {1,1,1};
MPI_Datatype types[] = {MPI_FLOAT, MPI_FLOAT, MPI_INT};

disps[0] = offsetof( point, x );
disps[1] = offsetof( point, y );
disps[2] = offsetof( point, centroid );

MPI_Datatype istruct, pstruct;
MPI_Type_create_struct(nfields, blocklens, disps, types, &istruct );
MPI_Type_create_resized( istruct, 0, (char *)&(points[1]) - (char *)(&points[0]), &pstruct );
MPI_Type_commit(&pstruct);

但是我必须执行以下结构BigInteger的MPI_Datatype:

But I have to do a MPI_Datatype of the following struct BigInteger:

struct mylimb
{
  int x;
};
typedef struct mylimb limb;
typedef enum eBoolean
{
  FALSE = 0,
  TRUE,
} boolean;

enum eSign
{
  SIGN_POSITIVE = 0,
  SIGN_NEGATIVE,
};

typedef struct BigInteger
{
  limb limbs[1000];
  int nbrLimbs;
  enum eSign sign;
} BigInteger;

该结构在代码中广泛使用，因此我不能简单地将其更改为更简单的方法.那么有人可以告诉我如何从BigInteger中进行MPI_Datatype吗?我的主要问题是肢体是肢体，我该如何将其连接到我的MPI_Datatype

The struct is widely used in the code so I can not simply change it to a easier way. So can anybody tell my how I can do a MPI_Datatype from the BigInteger?My main problem is the limb which is a mylimb how can I concat this into my MPI_Datatype

提前谢谢！chrigi

Thanks in advance!chrigi

推荐答案

另一种重写BigInteger的方法是

typedef struct BigInteger
{
  int limbs[1000];
  int nbrLimbs;
  enum eSign sign;
} BigInteger;

，因此您可以将MPI_Type_create_struct()与blocklens={1000,1,1}一起使用

so you can use MPI_Type_create_struct() with blocklens={1000,1,1}

我主要关心的是enum eSign的大小.如果您不混合大小尾序，可以将其声明为MPI_BYTE和sizeof(enum eSign)

my main concern is the size of enum eSign. if you do not mix big and little endian, you can declare it as MPI_BYTE and sizeof(enum eSign)

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