[petsc-users] Solving Poisson equation with multigrid

[Satish Balay]

Sorry my configure cmd file was from an older test case for c++.

Do you need c++ build of PETSc? If not - suggest removing
--with-clanguage=C++ option.

[Majority of use cases should not need --with-clanguage=C++ - even if
user code is using PETSc from C++]

If c++ is needed - you can try adding: CXXCPPFLAGS='-h gnu'

Satish

On Wed, 5 Jun 2013, Michele Rosso wrote:

> Thank you Satish for your help.
> I followed you instructions, but I am getting some errors during the
> compilation.
> I attached the python script I used to configure PETSc, and the logs for both
> configure and make.
> 
> 
> Michele
> 
> On 05/31/2013 05:08 PM, Satish Balay wrote:
> > The following is my configure command to build PETSc on a cray with
> > cray compilers:
> > 
> > $ cat reconfigure-arch-test-cray.py
> > #!/usr/bin/python
> > if __name__ == '__main__':
> >    import sys
> >    import os
> >    sys.path.insert(0, os.path.abspath('config'))
> >    import configure
> >    configure_options = [
> >      '--with-cc=cc',
> >      '--with-clanguage=C++',
> >      '--with-clib-autodetect=0',
> >      '--with-cxx=CC',
> >      '--with-cxxlib-autodetect=0',
> >      '--with-fc=ftn',
> >      '--with-fortranlib-autodetect=0',
> >      '--with-x=0',
> >      'FFLAGS=-F -em',
> >      'LIBS=-L/opt/cray/cce/8.1.4/CC/x86-64/lib/x86-64/ -lcray-c++-rts
> > -lcraystdc++ -lsupc++ -lgcc_eh',
> >      'PETSC_ARCH=arch-test-cray',
> >    ]
> >    configure.petsc_configure(configure_options)
> > <<<<<<<<<
> > 
> > And you might have to look for the recommended optimization flags - and use
> > with:
> > --with-debgging=0 COPTFLAGS= FOPTFLAGS= CXXOPTFLAGS= etc.
> > 
> > And on BlueWaters - you would have to remove the following lines from
> > PETSC_ARCH/include/petscconf.h [before runing 'make all' to build the
> > libraries]
> > 
> > #ifndef PETSC_HAVE_GETPWUID
> > #define PETSC_HAVE_GETPWUID 1
> > #endif
> > <<<<<
> > 
> > Satish
> > 
> > On Fri, 31 May 2013, Michele Rosso wrote:
> > 
> > > Thanks, but I'd rather use Cray since only a small part of my code relies
> > > on
> > > PETSc and, as suggested by the BW staff,
> > > Cray-compiled code performs generally better on Cray system.
> > > 
> > > Michele
> > > 
> > > On 05/31/2013 02:57 PM, Jed Brown wrote:
> > > > Michele Rosso <mrosso at uci.edu> writes:
> > > > 
> > > > > Hi,
> > > > > 
> > > > > I confirm that
> > > > > 
> > > > >            -pc_type gamg  -pc_mg_cycle_type v  -pc_gamg_agg_nsmooths 1
> > > > > 
> > > > > produces the correct shift in PETSc 3.4.
> > > > > So my problem is solved.   I will upgrade to 3.4 in my productive
> > > > > machine installation.
> > > > > It is a Cray machine (Blue Waters). Assuming I want to use the Cray
> > > > > compiler, which options should I use for ./configure
> > > > > for the installation.
> > > > Or the Intel compiler or GCC.  PETSc should run at similar speed with
> > > > any.  IIRC, Cray recommends the Intel compiler on their machines with
> > > > Intel CPUs.  There are examples in config/examples/.
> > > > 
> > > 
> 
>