Wrong mpi number of processors

Question

Sorry, I\'m sure making a silly mistake, but did not work out.

I\'m compiling a simple mpi hello world:

#include 
#include 

         


        

Answer 1

In this case, you need mpiexec from the 'mpich2' package.

Firstly, remove all mpi packages that installed on your computer. If your server is Ubuntu, you can use the command:

sudo apt-get purge mpi mpich2 openmpi-common

To make sure that you have removed all the packages, try this command

which mpiexec

If you got nothing in response, you already removed all the packages.

Then reinstall the package of mpich2

sudo apt-get install mpich2

Try to compile and run your code again! Hope this help!