[mpich-discuss] Different architectures

[Jim Dinan]

Hi Peter,

Yes -- you will have to install a 32 bit build of MPICH on all machines 
in your cluster, and you will also have to ensure that your application 
is built as a 32-bit binary on all machines.  The problem is that 32/64 
bit nodes won't agree on the sizes of basic datatypes (integer, address, 
etc), which complicates communication and can have a performance impact. 
  Technically, the MPI standard supports such heterogeneous system 
configurations, but most MPI implementations (including MPICH) do not.

Best,
  ~Jim.

On 12/9/12 2:55 PM, Peter Kroon wrote:
> Are you suggestion that I should install a 32b version on all machines
> because 32b can't *talk* to 64b?
>
>
> 2012/12/9 Jeff Hammond <jhammond at alcf.anl.gov
> <mailto:jhammond at alcf.anl.gov>>
>
>     It appears you're trying to use the 64b library (ELFCLASS64...) on the
>     32b master.  In any case, I don't believe MPICH works in the
>     heterogeneous case.  In theory, you should be able to use a 32b
>     library across both machines though.
>
>     Jeff
>
>     On Sun, Dec 9, 2012 at 1:40 PM, Peter Kroon <plakroon at gmail.com
>     <mailto:plakroon at gmail.com>> wrote:
>      > Hello,
>      >
>      > I've installed mpich2 on ubuntu i386(master) via
>      > https://help.ubuntu.com/community/MpichCluster
>      > I have another machine amd64(slave).
>      >
>      > When i run my script on master I get an error: error while
>     loading shared
>      > libraries: linbmpich.so.3: wrong ELF CLASS: ELFCLASS64
>      >
>      > Is mpich compatible with different architectures? If so what's
>     the easiest
>      > way for me to get rid of my error?
>      >
>      > Also note that I need this to work with x86-64 as well.
>      >
>      > Best,
>      > Peter
>      >
>      >
>      >
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>
>     --
>     Jeff Hammond
>     Argonne Leadership Computing Facility
>     University of Chicago Computation Institute
>     jhammond at alcf.anl.gov <mailto:jhammond at alcf.anl.gov> / (630) 252-5381
>     http://www.linkedin.com/in/jeffhammond
>     https://wiki.alcf.anl.gov/parts/index.php/User:Jhammond
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