This problem usually comes from having a mix of openmpi and mpich both installed on the same machine. Is that the case? You can search for openmpi by running something like this from the command line:

  dpkg -l | grep openmpi

On 01/28/2014 08:50 AM, ehsan saei wrote:

for size the output is 1 independent from the number of processed that I
declare with "mpiexec -n ..."


On Tue, Jan 28, 2014 at 3:12 PM, Reuti <reuti@staff.uni-marburg.de

<mailto:reuti@staff.uni-marburg.de>> wrote:

    Am 28.01.2014 um 11:18 schrieb ehsan saei:

     > I still have the problem with mpi

    In the program you cited you don't output the size. Can you output
    the size in addition?

    -- Reuti



     > On Mon, Jan 27, 2014 at 4:47 PM, ehsan saei <ehsan.saei@gmail.com

    <mailto:ehsan.saei@gmail.com>> wrote:
     > which mpicxx returns: /usr/bin/mpicxx
     >
     >
     > On Mon, Jan 27, 2014 at 4:44 PM, Reuti

    <reuti@staff.uni-marburg.de <mailto:reuti@staff.uni-marburg.de>> wrote:
     > Am 27.01.2014 um 16:41 schrieb ehsan saei:
     >
     > > I compile the code with:  mpicxx main.cpp
     > > and run it with: mpiexec -n 8 ./a.out
     >
     > Does `which mpicxx` resp. `which mpiexec` point to the intended
    target?
     >
     > -- Reuti
     >
     >
     > > I use a single computer with dual core core i3
     > >
     > >
     > > On Mon, Jan 27, 2014 at 4:39 PM, Wesley Bland

    <wbland@mcs.anl.gov <mailto:wbland@mcs.anl.gov>> wrote:
     > > The code is fine. The problem is most likely either the way
    you’re executing your code or the way you installed it. Can you tell
    us how you executed in on the command line to start?
     > >
     > > Thanks,
     > > Wesley
     > >
     > >
     > >
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