Question

我正在创建一个程序来计算平均值和标准偏差以及打印数组。当我运行该程序时，我收到分段错误错误。

void printArray(int *array, int array_size){
for(int i = 0; i <array_size; i++){
    std::cout<<array[i]<<", ";
    if(i%10==9)
        std::cout<<std::endl;
    }
}

std::cout<<std::endl;
int sumArray(int *array, int array_size){
    int sum = 0;
    for(unsigned int i = 0; i < array_size; i++)
       sum += array[i];
    return sum;
}

float sumDifferences(int *array, int size, int average){
    float sumDifference;
    for(int i = 0; i<size; i++){
        float differenceSquare = (array[i]-average)*(array[i]-average);
        if(i==0)
            sumDifference = differenceSquare;
        else
            sumDifference = sumDifference= differenceSquare;
    }
    return sumDifference;
}
double fRand(double min, double max){
     double f = (double)rand() / RAND_MAX;
     return min + f * (max - min);
}
void coordinator(int world_rank, int world_size){
    int array_size = 100000;
    int array[array_size];
    int totalDiffSum;
    int totalMean;

    for(unsigned int i = 0; i <array_size; i++)
        array[i]=fRand(0, 51);
    int partition_size = array_size/world_size;
    std::cout<<"coordinator rank 0 partition size is " <<partition_size << std::endl;

    int *partition = new int[partition_size];
    MPI_Bcast(&partition_size, 1, MPI_INT, 0, MPI_COMM_WORLD);
    MPI_Scatter(array, partition_size, MPI_INT, partition, partition_size, MPI_INT, 0, MPI_COMM_WORLD);

    int sum = sumArray(partition, partition_size);
    int mean = sum / partition_size;
    MPI_Reduce(&mean, &totalMean, 1, MPI_LONG_LONG_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    int average = totalMean / world_size;

    MPI_Bcast(&average, 1, MPI_INT, 0, MPI_COMM_WORLD);
    int sumDiff = sumDifferences(partition, partition_size, average);

    MPI_Reduce(&sumDiff, &totalDiffSum, 1, MPI_LONG_LONG_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    double standardDeviation = sqrt(totalDiffSum / array_size);

    printArray(array,array_size);
    std::cout<<"Mean = "<<mean<<std::endl;
    std::cout<<"Standard Deviation = "<<standardDeviation<<std::endl;
    delete partition;
}

void participant(int world_rank,int world_size){
    int partition_size = 0;
    int totalMean;
    int totalDiffSum;
    int* array;

    MPI_Bcast(&partition_size, 1, MPI_INT, 0, MPI_COMM_WORLD);
    int *partition = new int[partition_size];

    MPI_Scatter(&array, partition_size, MPI_INT, partition, partition_size,MPI_INT, 0, MPI_COMM_WORLD);
    int sum = sumArray(partition, partition_size);
    int mean = sum / partition_size;

    MPI_Reduce(&mean, &totalMean, 1, MPI_LONG_LONG_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    int overallAverage = 0;

    MPI_Bcast(&overallAverage, 1, MPI_INT, 0, MPI_COMM_WORLD);
    int sumDiff = sumDifferences(partition, partition_size, overallAverage);

    MPI_Reduce(&sumDiff, &totalDiffSum, 1, MPI_LONG_LONG_INT, MPI_SUM, 0, MPI_COMM_WORLD);
    delete partition;
 }
int main(int argc, char **argv){
    MPI_Init(NULL,NULL);
    int world_size,world_rank;
    MPI_Comm_size(MPI_COMM_WORLD, &world_size);
    MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

    if(world_rank==0)
        coordinator(world_rank,world_size);
    else
        participant(world_rank,world_size);
    MPI_Finalize();
}

我在代码中看不到任何错误：

{{1}}

我非常感谢任何建议，因为我是c ++的新手，之前我从未遇到过这个错误。提前谢谢。

MPI程序中的分段错误（11）

0 个答案: