Question

我正在mpi上运行一个用C语言编写的简单的hello world程序，而我遇到的问题是我似乎无法为这个简单的程序执行10个进程。

#include <stdio.h>
#include "mpi.h"

int main(int argc, char *argv[])
{
    int rank; //rank of the process
    int size; //number of processes

    MPI_Init(&argc,&argv); //inititate MPI environment
    MPI_Comm_rank(MPI_COMM_WORLD,&rank);
    MPI_Comm_size(MPI_COMM_WORLD,&size);

    printf("Hello world from process %d of %d\n",rank,size);
    MPI_Finalize();
    return 0;
}

我通过以下方式在终端上运行它：

mpicc -o hello helloworld.c
mpirun --oversubscribe -np 10 hello

输出：

Hello world from process 0 of 10
Hello world from process 2 of 10
Hello world from process 3 of 10
Hello world from process 9 of 10
Hello world from process 7 of 10
Hello world from process 1 of 10
Hello world from process 6 of 10
Hello world from process 5 of 10
Hello world from process 4 of 10
Hello world from process 8 of 10
----------------------------------------------------------------------- 
---
A system call failed during shared memory initialization that should
not have.  It is likely that your MPI job will now either abort or
experience performance degradation.

我意识到我可以在双核Mac上进行超额预订的最大值是5，它不会产生上述警告，但除此以外，还会产生错误，并且我不确定为什么。

希望对此有所帮助。如果是这样，我该如何重新安装打开的mpi？

Answer 1

此错误已在https://github.com/open-mpi/ompi/issues/5798

进行了跟踪

同时，您可以

mpirun --mca btl_vader_backing_directory /tmp ...

或

export OMPI_MCA_btl_vader_backing_directory=/tmp
mpirun ...

打开MPI没有足够的可用插槽

1 个答案: