Question

我正在尝试在NVIDIA Jetson TX2上运行OpenMPI代码。但是我在运行mpiexec时遇到OPAL错误。

编译说明：

$ nvcc -I/home/user/.openmpi/include/ -L/home/user/.openmpi/lib/ -lmpi -std=c++11 *.cu *.cpp -o program
nvcc warning : The 'compute_20', 'sm_20', and 'sm_21' architectures are deprecated, and may be removed in a future release (Use -Wno-deprecated-gpu-targets to suppress warning).

执行错误消息：

$ mpiexec -np 4 ./program 
[user:05728] OPAL ERROR: Not initialized in file pmix2x_client.c at line 109
*** An error occurred in MPI_Init
*** on a NULL communicator
*** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
***    and potentially your MPI job)
[user:05728] Local abort before MPI_INIT completed completed successfully, but am not able to aggregate error messages, and not able to guarantee that all other processes were killed!
[user:05729] OPAL ERROR: Not initialized in file pmix2x_client.c at line 109
-------------------------------------------------------
Primary job  terminated normally, but 1 process returned
a non-zero exit code.. Per user-direction, the job has been aborted.
-------------------------------------------------------
*** An error occurred in MPI_Init
*** on a NULL communicator
*** MPI_ERRORS_ARE_FATAL (processes in this communicator will now abort,
***    and potentially your MPI job)
[user:05729] Local abort before MPI_INIT completed completed successfully, but am not able to aggregate error messages, and not able to guarantee that all other processes were killed!
--------------------------------------------------------------------------
mpiexec detected that one or more processes exited with non-zero status, thus causing
the job to be terminated. The first process to do so was:

  Process name: [[7361,1],0]
  Exit code:    1
--------------------------------------------------------------------------

我按照以下说明安装了OpenMPI版本3.1.2：

$ ./configure --prefix="/home/user/.openmpi" --with-cuda
$ make; sudo make install

我还根据此link的指示设置了$PATH和$LD_LIBRARY_PATH变量

我能够在笔记本电脑（Intel i7）上成功执行该程序。查找错误后，我发现一些链接提示我重新安装OpenMPI。我尝试过多次（包括重新下载该库）都没有成功。

任何帮助将不胜感激！

编辑

我尝试按照注释中的要求运行以下最小代码（main.cpp）：

#include <iostream>
#include "mpi.h"
#include <string>

int main(int argc, char *argv[]) {
  int rank, size;
  MPI_Init(&argc, &argv);
  MPI_Comm_size(MPI_COMM_WORLD, &size);
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  std::cout << rank << '\n';
  MPI_Finalize();
  return 0;
}

要对此进行编译，请重新运行上一个命令，并得到相同的错误：

$ nvcc -I/home/user/.openmpi/include/ -L/home/user/.openmpi/lib/ -lmpi -std=c++11 main.cpp -o program

但是，如果我使用mpic++进行编译，它将能够完美运行。

$ mpic++ main.cpp -o ./program
$ mpiexec -np 4 ./program 
0
1
3
2

Answer 1

您安装的是OpenMPI的 only 版本吗？我的猜测是您在构建和运行之间使用了不同的MPI版本。检查which mpirun，并搜索mpirun的实例。如果您使用的是Ubuntu，请

sudo updatedb
locate mpirun

如果您调用正确的mpirun（用于构建的版本相同），则错误应该消失。

使用nvcc执行OpenMPI代码时出错（OPAL错误）

1 个答案: