我是MVAPICH2的新用户,刚开始使用时遇到了麻烦。
首先,我想我已经安装成功了,通过这个:
./configure --disable-fortran --enable-cuda
make -j 4
make install
没有错误。
但是当我试图在example的目录中运行cpi的例子时,我遇到了这样的情况:
我可以通过 ssh 连接节点 gpu-cluster-1 和 gpu-cluster-4 而无需密码;
我使用 mpirun_rsh 在 gpu-cluster-1 和 gpu-cluster-4 上分别运行 cpi 示例,它工作正常,就像这样:
run@gpu-cluster-1:~/mvapich2-2.1rc1/examples$ mpirun_rsh -ssh -np 2 gpu-cluster-1 gpu-cluster-1 ./cpi
进程 0 of 2 在 gpu-cluster-1
进程 1 of 2 在 gpu-cluster-1
pi 大约为 3.1415926544231318,错误为 0.0000000008333387
挂钟时间 = 0.000089
run@gpu-cluster-4:~/mvapich2-2.1rc1/examples$ mpirun_rsh -ssh -np 2 gpu-cluster-4 gpu-cluster-4 ./cpi
进程 0 的 2 在 gpu-cluster-4
进程 1 2 在 gpu-cluster-4 上
pi 约为 3.1415926544231318,误差为 0.0000000008333387
挂钟时间 = 0.000134我使用 mpiexec 在 gpu-cluster-1 和 gpu-cluster-4 上运行 cpi 示例,它工作正常,就像这样:
run@gpu-cluster-1:~/mvapich2-2.1rc1/examples$ mpiexec -np 2 -f hostfile ./cpi
Process 0 of 2 is on gpu-cluster-1
Process 1 of 2 is on gpu-cluster-4
pi 约为 3.1415926544231318,错误为 0.0000000008333387
挂钟时间 = 0.000352 hostfile
中的内容为“gpu-集群 1\ngpu 集群 4"但是,当我在 gpu-cluster-1 和 gpu-cluster-4 上使用 mpirun_rsh、borh 运行 cpi 示例时,问题出现了:
run@gpu-cluster-1:~/mvapich2-2.1rc1/examples$ mpirun_rsh -ssh - np 2 -hostfile hostfile ./cpi Process 1 of 2 is on gpu-cluster-4
-----------------卡在这里,不继续-------- -----------------
很长一段时间后,我按 Ctrl + C,它会显示:
^C[gpu-cluster-1:mpirun_rsh][signal_processor] Caught signal 2 ,杀死作业
run@gpu-cluster-1:~/mvapich2-2.1rc1/examples$ [gpu-cluster-4:mpispawn_1][read_size] Unexpected End-Of-File on file descriptor 6. MPI 进程死了?
[gpu-cluster-4:mpispawn_1][read_size] 文件描述符 6 上出现意外的文件结束。MPI 进程死了?
[gpu-cluster-4:mpispawn_1][handle_mt_peer] 读取 PMI 套接字时出错。MPI进程死了?
[gpu-cluster-4:mpispawn_1][report_error] connect() failed: Connection denied (111)
困惑了很久,你能帮我解决这个问题吗?
以下是 cpi 示例的代码:
#include "mpi.h"
#include <stdio.h>
#include <math.h>
double f(double);
double f(double a)
{
return (4.0 / (1.0 + a*a));
}
int main(int argc,char *argv[])
{
int n, myid, numprocs, i;
double PI25DT = 3.141592653589793238462643;
double mypi, pi, h, sum, x;
double startwtime = 0.0, endwtime;
int namelen;
char processor_name[MPI_MAX_PROCESSOR_NAME];
MPI_Init(&argc,&argv);
MPI_Comm_size(MPI_COMM_WORLD,&numprocs);
MPI_Comm_rank(MPI_COMM_WORLD,&myid);
MPI_Get_processor_name(processor_name,&namelen);
fprintf(stdout,"Process %d of %d is on %s\n",
myid, numprocs, processor_name);
fflush(stdout);
n = 10000; /* default # of rectangles */
if (myid == 0)
startwtime = MPI_Wtime();
MPI_Bcast(&n, 1, MPI_INT, 0, MPI_COMM_WORLD);
h = 1.0 / (double) n;
sum = 0.0;
/* A slightly better approach starts from large i and works back */
for (i = myid + 1; i <= n; i += numprocs)
{
x = h * ((double)i - 0.5);
sum += f(x);
}
mypi = h * sum;
MPI_Reduce(&mypi, &pi, 1, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
if (myid == 0) {
endwtime = MPI_Wtime();
printf("pi is approximately %.16f, Error is %.16f\n",
pi, fabs(pi - PI25DT));
printf("wall clock time = %f\n", endwtime-startwtime);
fflush(stdout);
}
MPI_Finalize();
return 0;
}