tests fail in 64-bit dolfin builds

64-bit dolfin (64-bit indexing) can be built by building against 64-bit PETSc. This has recently been done for debian (and Ubuntu).

Some tests fail for the 64-bit build. Test logs can be found at https://ci.debian.net/packages/d/dolfin/unstable/amd64/, look for version 2019.2.0~git20200218.027d9cc-12, e.g. https://ci.debian.net/data/autopkgtest/testing/amd64/d/dolfin/6517526/log.gz

There seem to be a couple of classes of failure.

1) “Out of memory” e.g. in C++ unittests

    Run 64-bit C++ unit tests (serial)
    Test project /tmp/autopkgtest-lxc.k8ge4uns/downtmp/build.QiR/src/dolfin-unittests
        Start 1: unittests
    1/1 Test #1: unittests ........................***Failed    1.50 sec

    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    unittests is a Catch v1.9.6 host application.
    Run with -? for options

    -------------------------------------------------------------------------------
    Initialise PETSc
    -------------------------------------------------------------------------------
    /tmp/autopkgtest-lxc.k8ge4uns/downtmp/build.QiR/src/test/unit/cpp/common/SubSystemsManager.cpp:42
    ...............................................................................

    /tmp/autopkgtest-lxc.k8ge4uns/downtmp/build.QiR/src/test/unit/cpp/common/SubSystemsManager.cpp:44: FAILED:
      CHECK_NOTHROW( init_petsc() )
    due to unexpected exception with message:


      *** -------------------------------------------------------------------------
      *** DOLFIN encountered an error. If you are not able to resolve this issue
      *** using the information listed below, you can ask for help at
      ***
      ***     fenics-support@googlegroups.com
      ***
      *** Remember to include the error message listed below and, if possible,
      *** include a *minimal* running example to reproduce the error.
      ***
      *** -------------------------------------------------------------------------
      *** Error:   Unable to successfully call PETSc function 'VecSetSizes'.
      *** Reason:  PETSc error code is: 55 (Out of memory).
      *** Where:   This error was encountered inside /build/dolfin-HRGZgk/dolfin-
      2019.2.0~git20200218.027d9cc/dolfin/la/PETScVector.cpp.
      *** Process: 0
      ***
      *** DOLFIN version: 2019.2.0.dev0
      *** Git changeset:  unknown
      *** -------------------------------------------------------------------------

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2) Unable to call KSPSolve in some demos (others pass), e.g.

     Start 13: demo_multimesh-stokes_mpi
7/48 Test #13: demo_multimesh-stokes_mpi ..............   Passed    0.40 sec
     Start 15: demo_sym-dirichlet-bc_mpi
8/48 Test #15: demo_sym-dirichlet-bc_mpi ..............***Failed    1.75 sec
Process 0: <Table of size 2 x 1>
Process 1: <Table of size 2 x 1>
Process 0: *** Warning: Using PETSc native LU solver. Consider specifying a more efficient LU solver (e.g.umfpack) if available.
Process 2: <Table of size 2 x 1>
Process 1: *** Warning: Using PETSc native LU solver. Consider specifying a more efficient LU solver (e.g.umfpack) if available.
Process 2: *** Warning: Using PETSc native LU solver. Consider specifying a more efficient LU solver (e.g.umfpack) if available.
terminate called after throwing an instance of 'std::runtime_error'
terminate called after throwing an instance of 'std::runtime_error'
terminate called after throwing an instance of 'std::runtime_error'
  what():    what():  

*** -------------------------------------------------------------------------
*** DOLFIN encountered an error. If you are not able to resolve this issue
*** using the information listed below, you can ask for help at
***
***     fenics-support@googlegroups.com
***
*** Remember to include the error message listed below and, if possible,
*** include a *minimal* running example to reproduce the error.
***
*** -------------------------------------------------------------------------
*** Error:   Unable to successfully call PETSc function 'KSPSolve'.
*** Reason:  PETSc error code is: 92 (See https://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html for possible LU and Cholesky solvers).
*** Where:   This error was encountered inside /build/dolfin-HRGZgk/dolfin-2019.2.0~git20200218.027d9cc/dolfin/la/PETScKrylovSolver.cpp.
*** Process: 2
*** 
*** DOLFIN version: 2019.2.0.dev0
*** Git changeset:  unknown
*** -------------------------------------------------------------------------

[ci-215-65927b02:02396] *** Process received signal ***
[ci-215-65927b02:02396] Signal: Aborted (6)
[ci-215-65927b02:02396] Signal code:  (-6)

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Given the reference to “possible LU and Cholesky solvers” in the KSPSolve error message, I suspect the latter class might simply mean that 64-bit PETSc doesn’t have the linear solvers that dolfin would otherwise invoke. superlu for instance is not available in the 64 bit build. Would this explain the error?

3) MPI_INIT problems, e.g.

18/49 Test #38: demo_curl-curl_serial .....................***Failed    0.02 sec
*** The MPI_Comm_rank() function was called before MPI_INIT was invoked.
*** This is disallowed by the MPI standard.
*** Your MPI job will now abort.
[ci-215-65927b02:02093] Local abort before MPI_INIT completed completed successfully, but am not able to aggregate error messages, and not able to guarantee that all other processes were killed!

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