> > Hello! > > > > I know this has been discussed earlier, but I cannot find a bug or > > blueprint reported for it. > > > > Let say I have a MixedSpace containing several global dofs (Real spaces) > > and one CG. Even if I define a form using functions defined only on the > > CG space it takes literally forever to assemble... This is because for > > each cell, a bunch of zeros are added to the global matrix, as the > > dofmap which defines the element matrix, is based on the whole > > MixedSpace. It would be _really_ nice if the size of the element matrix > > was based on the actuall dofs that get assembled. > > As a quick fix, try using the Epetra backend. My experience is that it's > much faster for this type of case. It must use a different search method > for insertion than PETSc.
That helped _a lot_! Unfortunatly it looked like some assert kicked in when using the NewtonSolver: python: /usr/include/boost/smart_ptr/shared_ptr.hpp:412: typename boost::detail::shared_ptr_traits<T>::reference boost::shared_ptr< <template- parameter-1-1> >::operator*() const [with T = Epetra_FECrsMatrix]: Assertion `px != 0' failed. [bamse:25675] *** Process received signal *** [bamse:25675] Signal: Aborted (6) [bamse:25675] Signal code: (-6) [bamse:25675] [ 0] /lib/libpthread.so.0(+0xfb40) [0x7ff3bf52ab40] [bamse:25675] [ 1] /lib/libc.so.6(gsignal+0x35) [0x7ff3be34bba5] [bamse:25675] [ 2] /lib/libc.so.6(abort+0x180) [0x7ff3be34f6b0] [bamse:25675] [ 3] /lib/libc.so.6(__assert_fail+0xf1) [0x7ff3be344a71] [bamse:25675] [ 4] /home/hake/bzr/fenics/dolfin/work/build/dolfin/libdolfin.so.0.9(_ZN6dolfin12EpetraMatrixaSERKS0_+0x156) [0x7ff3b983d7a6] [bamse:25675] [ 5] /home/hake/bzr/fenics/dolfin/work/build/dolfin/libdolfin.so.0.9(_ZN6dolfin12EpetraMatrixaSERKNS_13GenericMatrixE+0x52) [0x7ff3b983da12] [bamse:25675] [ 6] /home/hake/local/lib/python2.6/site- packages/dolfin/_cpp.so(+0xe0f23) [0x7ff3b9d4df23] [bamse:25675] [ 7] python(PyEval_EvalFrameEx+0x5ca4) [0x4a5ce4] [bamse:25675] [ 8] python(PyEval_EvalCodeEx+0x911) [0x4a6bd1] [bamse:25675] [ 9] python() [0x535b50] [bamse:25675] [10] python(PyObject_Call+0x47) [0x41c9d7] [bamse:25675] [11] python() [0x42570f] [bamse:25675] [12] python(PyObject_CallMethodObjArgs+0x1e4) [0x4209c4] [bamse:25675] [13] /home/hake/local/lib/python2.6/site- packages/dolfin/_cpp.so(_ZN29SwigDirector_NonlinearProblem1JERN6dolfin13GenericMatrixERKNS0_13GenericVectorE+0xfe) [0x7ff3b9d3a3be] [bamse:25675] [14] /home/hake/bzr/fenics/dolfin/work/build/dolfin/libdolfin.so.0.9(_ZN6dolfin12NewtonSolver5solveERNS_16NonlinearProblemERNS_13GenericVectorE+0x180) [0x7ff3b9936b00] [bamse:25675] [15] /home/hake/local/lib/python2.6/site- packages/dolfin/_cpp.so(+0x1402e8) [0x7ff3b9dad2e8] [bamse:25675] [16] python(PyEval_EvalFrameEx+0x5ca4) [0x4a5ce4] [bamse:25675] [17] python(PyEval_EvalFrameEx+0x5a70) [0x4a5ab0] [bamse:25675] [18] python(PyEval_EvalCodeEx+0x911) [0x4a6bd1] [bamse:25675] [19] python(PyEval_EvalFrameEx+0x4d19) [0x4a4d59] [bamse:25675] [20] python(PyEval_EvalFrameEx+0x5a70) [0x4a5ab0] [bamse:25675] *** End of error message *** Aborted Have any one used Epetra backend for hand cooked NonlinearProblems in Python. It looks like somehting might happen with the director typemap here... > > Garth has previously mentioned that this is done to simplify the assemble > > interface, which is understandable. However, beside fixing assemble of > > global dofs in paralell this is my biggest wish for ufc/ffc/dolfin at > > the moment :) > > > > Unfortunatly I know to little about the ufc/ffc part of FEniCS to say > > anything useful about what it would take to implement, but I would like > > to here what others think. > > I vaguely recall a blueprint on identifying in the generated code global > dofs. I think that this is necessary in order to handle parallel > assembly, etc, of global dofs. Me too, but I could not find it. Johan > Garth > > > Best regards, > > > > Johan > > > > _______________________________________________ > > Mailing list: https://launchpad.net/~dolfin > > Post to : [email protected] > > Unsubscribe : https://launchpad.net/~dolfin > > More help : https://help.launchpad.net/ListHelp > > _______________________________________________ > Mailing list: https://launchpad.net/~dolfin > Post to : [email protected] > Unsubscribe : https://launchpad.net/~dolfin > More help : https://help.launchpad.net/ListHelp _______________________________________________ Mailing list: https://launchpad.net/~dolfin Post to : [email protected] Unsubscribe : https://launchpad.net/~dolfin More help : https://help.launchpad.net/ListHelp
