[petsc-users] Solving Poisson equation with multigrid

[Michele Rosso]

Hi Satish,

I tried what you suggested:

#!/usr/bin/python
if __name__ == '__main__':
   import sys
   import os
   sys.path.insert(0, os.path.abspath('config'))
   import configure
   configure_options = [
     'PETSC_DIR=/u/sciteam/mrosso/LIBS/petsc-3.4.0',
     '--with-cc=cc',
     '--with-clib-autodetect=0',
     '--with-cxx=CC',
     '--with-cxxlib-autodetect=0',
     '--with-fc=ftn',
     '--with-fortranlib-autodetect=0',
     '--with-x=0',
     '--with-debgging=0',
     '--COPTFLAGS=-O3',
     '--FOPTFLAGS=-O3',
     'FFLAGS=-F -em',
     'LIBS=-L/opt/cray/cce/8.1.7/CC/x86-64/lib/x86-64/ -lcray-c++ -rts 
-lcraystdc++ -lsupc++ -lgcc_eh',
     'PETSC_ARCH=arch-test-cray',
   ]
   configure.petsc_configure(configure_options)

but now I receive another error:

"C compiler you provided with -with-cc=cc does not work"

I attached the log file. Thanks for your help.

Michele


On 06/05/2013 02:15 PM, Satish Balay wrote:
> 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/.
>>>>>
>>

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