This looks more like a Linux problem rather than a MPICH problem.
Could you give us the output of the following commands?
1. ls -la mpiexec.hydra
2. ldd -r mpiexec.hydra

—
Huiwei

On May 21, 2014, at 8:53 PM, Yida Wang <yidawa@gmail.com> wrote:

> The same error:
> -bash: ./mpiexec.hydra: cannot execute binary file
>
>
> On Wed, May 21, 2014 at 9:52 PM, Junchao Zhang <jczhang@mcs.anl.gov> wrote:
> You can go to the directory with mpiexec.hydra, and type ./mpiexec.hydra, to see what happens.
>
> --Junchao Zhang
>
>
> On Wed, May 21, 2014 at 8:48 PM, Yida Wang <yidawa@gmail.com> wrote:
> Linux xxx 2.6.32-279.14.1.el6.x86_64 #1 SMP Tue Nov 6 23:43:09 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
>
>
> On Wed, May 21, 2014 at 9:46 PM, Junchao Zhang <jczhang@mcs.anl.gov> wrote:
> What is the output of "uname -a" on your machine?
>
> --Junchao Zhang
>
>
> On Wed, May 21, 2014 at 8:05 PM, Yida Wang <yidawa@gmail.com> wrote:
> Hi Guys,
>
> I just finished installing mpich. But when I tried to run it, it returned "cannot execute binary file". I double checked the file type by "file mpiexec.hydra", which got "mpiexec.hydra: ELF 64-bit LSB executable, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.16, not stripped". I am running 64-bit CentOS.
>
> Any ideas of this error?
>
> Thanks,
> YW
>
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