[mpich-discuss] issues when writing a simple makefile to build MPI programs

[Anthony Chan]

You need to rebuild mpich2 for 32bit.  Set CFLAGS/CXXFLAGS/FFLAGS/FCFLAGS
to -m32 (assume your system has the 32bit support).

BTW, your install of 1.2.1p1 mpich2 is old, please upgrade if possible
(the latest stable release is 1.4)

A.Chan 

----- Original Message -----
> I think the default installed mpich2 in 64-bit ubuntu is in x86_64
> mode.
> When I try to compile/link an MPI program in 32-bit mode, there is an
> error
> below:
> /usr/lib/libmpich.so: file not recognized: File format not recognized
> 
> How can I configure the compile/link flags? Do I need to rebuild
> mpich2 to
> get a 32-bit libraries? Or is there any 32-bit libraries coexisted
> with
> 64-bit libraries? Thanks.
> 
> Below is the output version information of the default installed
> MPICH2:
> MPICH2 Version: 1.2.1p1
> MPICH2 Release date: Unknown, built on Tue Apr 27 15:06:31 UTC 2010
> MPICH2 Device: ch3:nemesis
> MPICH2 configure: --build=x86_64-linux-gnu --prefix=/usr
> --includedir=${prefix}/include --mandir=${prefix}/share/man
> --infodir=${prefix}/share/info --sysconfdir=/etc --localstatedir=/var
> --libexecdir=${prefix}/lib/mpich2 --disable-maintainer-mode
> --disable-dependency-tracking --disable-silent-rules --srcdir=.
> --enable-sharedlibs=gcc --prefix=/usr --enable-f90
> --sysconfdir=/etc/mpich2
> --includedir=/usr/include/mpich2 --docdir=/usr/share/doc/mpich2
> MPICH2 CC: gcc -g -O2 -g -Wall -O2 -O2
> MPICH2 CXX: c++ -g -O2 -g -Wall -O2 -O2
> MPICH2 F77: gfortran -g -O2 -O2
> MPICH2 F90: f95 -O2
> 
> - Clara
> 
> On Fri, Jun 24, 2011 at 12:08 AM, Pavan Balaji <balaji at mcs.anl.gov>
> wrote:
> 
> > Clara,
> >
> >
> > On 06/23/2011 10:53 PM, clara wrote:
> >
> >> If I only use shared memory communication among processes on a
> >> single
> >> node, how can I configure the mpich2.1.4 (except --with-pm=gforker)
> >> in
> >> order to link libraries as little as possible?
> >>
> >
> > Shared memory communication support comes by default in MPICH2. You
> > don't
> > need to pass any special configure options; not even
> > --with-pm=gforker.
> > Unfortunately, all libraries are still required to be linked with
> > even when
> > only shared memory support is needed.
> >
> >  -- Pavan
> >
> >
> > --
> > Pavan Balaji
> > http://www.mcs.anl.gov/~balaji
> >
> 
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