In addition to Gilles suggestion, please check the answers to similar questions you posted a few days ago about the machinefile/hostfile syntax. They are archived here: http://lists.mpich.org/pipermail/discuss/2014-April/002486.html This error message suggests that it doesn't exist, is misplaced, or is not readable: mpiexec@Mojtaba] HYDU_parse_hostfile (utils/args/args.c:319): unable to open host file: ./machinefile If you preceed the machinefile name by "./" it should be in the same directory where you launch the mpiexec command line. Make sure the file exists, follows the standard syntax, and has read permissions open. On 04/11/2014 06:59 AM, Gilles Gouaillardet wrote:

Hi,

you need to create the machinefile manually this is a text file, and the basic syntax is one hostname per line

as i wrote earlier, i recommend you use -host localhost instead of -machinefile machinefile

Cheers,

Gilles

On 2014/04/11 19:56, Mojtaba S. Moghani wrote:

...

Hi

I cant see the file named machinefile, where it should be?

and if i dont have that, how i should make that file?

how i could know that im done with mpich-3.1 installation?

thanks,

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