[petsc-users] Solving Poisson equation with multigrid

[Satish Balay]

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/.
> > 
> 
>