[petsc-users] petsc4py Build Problem

[Matthew Knepley]

On Thu, Jun 11, 2015 at 5:07 AM, Mikhail Khodak <mkhodak at princeton.edu>
wrote:

> Thank you for your help - the install seems to work, apart from routines
> requiring MPI, which fail due to the "Attempting to use an MPI routine
> before initializing MPI" error. This seems to be an error in the PETSc
> build itself.
>

The MPI routines will not work until after

import petsc4py, sys
petsc4py.init(sys.argv)
from petsc4py import PETSc

If they fail after this, it is usually a mismatch between the mpiexec being
used and the MPI
libraries being linked.

  Thanks,

    Matt

Thanks again,
> Mikhail Khodak
>
> On Mon, Jun 8, 2015 at 5:11 AM, Lisandro Dalcin <dalcinl at gmail.com> wrote:
>
>> On 8 June 2015 at 02:50, Mikhail Khodak <mkhodak at princeton.edu> wrote:
>> > Hello, I am trying to build petsc4py-3.5.1 using Cygwin on 64-bit
>> Windows 7.
>> > I have built PETSc 3.5.4 with shared and dynamic libraries using
>> > mpich2-1.2.1 and successfully ran the installation tests. I am using
>> Python
>> > 2.7 and NumPy 1.9.2 and have installed mpi4py. However, when I attempt
>> to
>> > install petsc4py (both with pip and distutils) I get a mpicc compiler
>> error
>> > due to undefined references/symbols. I have attached the output of
>> running
>> >
>> > pip install petsc petsc4py --allow-external petsc --allow-external
>> petsc4py
>> >
>>
>> I've never ever built or test petsc4py under Cygwin. The errors you
>> see are expected.
>> Perhaps you can manually workaround the issues following the following
>> steps:
>>
>> 1) Download the petsc4py tarball and unpack it.
>> 2) Open the file "src/libpetsc4py/libpetsc4py.h", add remove all
>> occurences of DL_IMPORT, i.e, replace DL_IMPORT(XYZ) for just XYZ
>> 3) Use pip again:
>>
>> pip install petsc
>> pip install .
>>
>> The last line assumes your current working directory is the one having
>> petsc4py's setup.py
>>
>> Finally, I do not guarantee this will work. I'm just guessing,
>> petsc4py never explicitly supported Windows and/or Cygwin.
>>
>>
>> --
>> Lisandro Dalcin
>> ============
>> Research Scientist
>> Computer, Electrical and Mathematical Sciences & Engineering (CEMSE)
>> Numerical Porous Media Center (NumPor)
>> King Abdullah University of Science and Technology (KAUST)
>> http://numpor.kaust.edu.sa/
>>
>> 4700 King Abdullah University of Science and Technology
>> al-Khawarizmi Bldg (Bldg 1), Office # 4332
>> Thuwal 23955-6900, Kingdom of Saudi Arabia
>> http://www.kaust.edu.sa
>>
>> Office Phone: +966 12 808-0459
>>
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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