As the error message says, mpiexec does not understand the -localonly option. You can remove it and try again. Note that we do not support Windows anymore (https://wiki.mpich.org/mpich/index.php/Frequently_Asked_Questions#Q:_Why_can...). You will have better luck with MS-MPI or Intel MPI. Halim www.mcs.anl.gov/~aamer On 9/23/16 1:55 PM, Kanak Datta wrote:

Hi

I am trying to use mpich2 1.4.1 alongside Quantum Espresso 5.3. I have been using Windows 7 Enterprise version on Intel Xeon processor.

I have followed instructions given in the following link to install mpich2 for windows 7: http://swash.sourceforge.net/online_doc/swashimp/node9.html

However, when I am trying to execute QE in parallel formation I am getting the following error:

Unknown option: -localonly

I use the following line to run QE using mpich2:

mpiexec -localonly -np 8 pw <abc.scf.inp>

I don't know what's wrong here.

I can run single execution using QE. However, I have not been able to run parallel execution. What should I do?

Any help will be highly appreciated.

Thanks Kanak

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