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我正在从教程中阅读和练习MPI程序。在那里我看到了一个找到过程等级的例子。但是,同样的例子,我的机器(Ubuntu的10.04)上根据教程给予不同的输出.. 这里是程序MPI意外输出
#include <stdio.h>
#include <mpi.h>
main(int argc, char **argv)
{
int ierr, num_procs, my_id;
ierr = MPI_Init(&argc, &argv);
/* find out MY process ID, and how many processes were started. */
ierr = MPI_Comm_rank(MPI_COMM_WORLD, &my_id);
ierr = MPI_Comm_size(MPI_COMM_WORLD, &num_procs);
printf("Hello world! I'm process %i out of %i processes\n",
my_id, num_procs);
ierr = MPI_Finalize();
}
预期的输出是
预期输出:
Hello world! I'm process 0 out of 4 processes.
Hello world! I'm process 2 out of 4 processes.
Hello world! I'm process 1 out of 4 processes.
Hello world! I'm process 3 out of 4 processes.
我得到的输出
Hello world! I'm process 0 out of 1 processes
Hello world! I'm process 0 out of 1 processes
Hello world! I'm process 0 out of 1 processes
Hello world! I'm process 0 out of 1 processes
我的妈妈中国采用英特尔i3,戴尔Inspiron和Ubuntu 10.04操作系统。帮助我解决问题。
什么命令你使用运行你的应用程序? MPI应用程序通常使用'mpirun'或类似工具运行。 – 2013-02-26 17:27:57
[MPI \ _Rank可能为所有进程返回相同的进程号](http://stackoverflow.com/questions/20287564/mpi-rank-return-same-process-number-for-all-process) – 2014-06-16 15:18:28