问题描述
我正在使用Open MPI编写 parallel 程序.我正在运行Snow Leopard 10.6.4，并通过 homebrew 程序包管理器安装了Open MPI
I'm writing a parallel program using Open MPI. I'm running Snow Leopard 10.6.4, and I installed Open MPI through the homebrew package manager.
当我使用mpirun -np 8 ./test运行程序时，每个进程都报告它的等级为0，并认为进程总数为1，并且向控制台吐出了8行process rank: 0, total processes: 1.
When I run my program using mpirun -np 8 ./test, every process reports that it has rank 0, and believes the total number of processes to be 1, and 8 lines of process rank: 0, total processes: 1 get spit out to the console.
我知道这不是代码问题，因为完全相同的代码将按预期在我大学计算机实验室的某些Ubuntu计算机上编译并运行.我检查了自制软件的错误跟踪器，没有人报告Open MPI软件包有问题.我很茫然.
I know it's not a code issue, since the exact same code will compile and run as expected on some Ubuntu machines in my college's computer lab. I've checked homebrew's bug tracker, and no-one's reported an issue with the Open MPI package. I'm at a loss.
推荐答案
完全卸载以前的MPI实现.
Uninstall previous MPI implementation completely.
就我而言，我先安装了MPICH2，然后将其卸载，然后更改为OpenMPI.然后发生相同的情况，所有进程的等级均为0.我解决此问题的方法是:从系统中完全卸载MPICH2(我使用Ubuntu/Debian Linux).
In my case I installed MPICH2 first, then uninstalled it, and changed to OpenMPI. Then same case occured, all process' rank were 0. What I did to fix this problem is: uninstall MPICH2 completely from my system (I use Ubuntu/Debian Linux).
# apt-get remove mpich2
# apt-get autoremove
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