On Fri, Apr 8, 2022 at 8:25 AM 강다영 <dydy1...@pusan.ac.kr> wrote:
> Dear all, > > I have a question about the overflow error I met during the SCM training in > Libmesh. > > For the training, I used the mesh model with a degree of freedom of > 318,021. > And I got an error message as below: > > [0]PETSC ERROR: --------------------- Error Message > -------------------------------------------------------------- > [0]PETSC ERROR: No support for this operation for this object type > [0]PETSC ERROR: Product of two integer 317065 317065 overflow, you must > ./configure PETSc with --with-64-bit-indices for the case you are running > [0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html > for trouble shooting. > [0]PETSC ERROR: Petsc Release Version 3.12.2, unknown > [0]PETSC ERROR: example-opt on a arch-linux2-c-debug named X570-AORUS-ELITE > by dc308-ubuntu Thu Apr 7 12:46:34 2022 > [0]PETSC ERROR: Configure options --with-cc=mpicc --with-cxx=mpicxx > --with-fc=mpif90 --download-fblaslapack --download-parmetis > --download-metis --download-scalapack --download-hdf5 --download-superlu > --download-mumps > [0]PETSC ERROR: #1 PetscIntMultError() line 2167 in > /home/dc308-ubuntu/Packages/petsc/include/petscsys.h > [0]PETSC ERROR: #2 BVCreate_Svec() line 461 in > /home/dc308-ubuntu/Packages/slepc/src/sys/classes/bv/impls/svec/svec.c > [0]PETSC ERROR: #3 BVSetSizesFromVec() line 186 in > /home/dc308-ubuntu/Packages/slepc/src/sys/classes/bv/interface/bvbasic.c > [0]PETSC ERROR: #4 EPSAllocateSolution() line 570 in > /home/dc308-ubuntu/Packages/slepc/src/eps/interface/epssetup.c > [0]PETSC ERROR: #5 EPSSetUp_LAPACK() line 36 in > /home/dc308-ubuntu/Packages/slepc/src/eps/impls/lapack/lapack.c > [0]PETSC ERROR: #6 EPSSetUp() line 173 in > /home/dc308-ubuntu/Packages/slepc/src/eps/interface/epssetup.c > [0]PETSC ERROR: #7 EPSSolve() line 136 in > /home/dc308-ubuntu/Packages/slepc/src/eps/interface/epssolve.c > > In the 3rd line of the error message, I noticed that the number "317065" > matches with (the number of degree of freedom of model - the number of > constrained degree of freedom of the model). > Therefore, I decreased the degree of freedom to 7,503 to deal with this > error. > With this model, it was possible to finish the SCM training without an > error. > So I guess a large degree of freedom caused this overflow error. > > However, I'd still like to fix this overflow error to use the original > model with a degree of freedom of 318,021 (for more accurate solutions). > > Could you possibly give some information on how to finish SCM training for > a model with a large degree of freedom without the overflow error? > And I'd appreciate it if you could let me know the maximum degree of > freedom that will not cause the overflow error. > Hi Dayoung, I'm speculating here, but it looks like you are using a LAPACK-based (hence dense) solver, so that will limit the size of problem that you can solve. This solver apparently needs to build a single array of size NDOFS**2, so the largest size problem you will be able to run is likely approximately NODFS = sqrt(INT_MAX) = sqrt(2147483647) = 46340. I don't know exactly how to fix this issue, but it would probably involve using a different solver at the very least. Finally, our mailing list is not really followed by many people, so you may also have more luck by starting a GitHub Discussion ( https://github.com/libMesh/libmesh/discussions) on this topic. -- John _______________________________________________ Libmesh-users mailing list Libmesh-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmesh-users
