[petsc-dev] Floating point exception in ex47cu.cu

[Victor Minden]

Eugene,

Based off of

 Configure options --prefix=/home/kukushkinav
--with-blas-lapack-dir=/opt/intel/composerxe-2011.0.084/mkl
--with-mpi-dir=/opt/intel/impi/4.0.1.007/intel64/bin<http://4.0.1.7/intel64/bin>
 --with-cuda=1
--with-cusp=1 --with-thrust=1
--with-thrust-dir=/home/kukushkinav/include
--with-cusp-dir=/home/kukushkinav/include

It looks like maybe you're not setting the configure flag
--with-cuda-arch=XXX.  Without this, PETSc uses the nvcc default, which when
I last looked was sm_10.  The problem with this is that sm_10 doesn't
support double-precision.  Maybe this is your problem?  For example, I use
-with-cuda-arch=sm_13, which corresponds to NVIDIA compute capability 1.3

Cheers,

Victor
---
Victor L. Minden

Tufts University
School of Engineering
Class of 2012


On Fri, Apr 22, 2011 at 12:22 PM, Евгений Козлов <neoveneficus at gmail.com>wrote:

> Hello,
>
> I am interesting in using PETSc for iterative solving sparse linear
> system on multi-GPU systems.
>
> First of all, I compiled PETSc-dev and tried to run some examples,
> which will run on GPU.
>
> I found src/snes/examples/tutorials/ex47cu.cu. It was compiled and
> executed.
>
> Out of original program src/snes/examples/tutorials/ex47cu.cu:
>
> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Floating point exception!
> [0]PETSC ERROR: User provided compute function generated a Not-a-Number!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Development HG revision:
> d3e10315d68b1dd5481adb2889c7d354880da362  HG Date: Wed Apr 20 21:03:56
> 2011 -0500
> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
> [0]PETSC ERROR: See docs/index.html for manual pages.
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: ex47cu on a arch-linu named cn03 by kukushkinav Fri
> Apr 22 18:33:32 2011
> [0]PETSC ERROR: Libraries linked from /home/kukushkinav/lib
> [0]PETSC ERROR: Configure run at Thu Apr 21 19:18:22 2011
> [0]PETSC ERROR: Configure options --prefix=/home/kukushkinav
> --with-blas-lapack-dir=/opt/intel/composerxe-2011.0.084/mkl
> --with-mpi-dir=/opt/intel/impi/4.0.1.007/intel64/bin --with-cuda=1
> --with-cusp=1 --with-thrust=1
> --with-thrust-dir=/home/kukushkinav/include
> --with-cusp-dir=/home/kukushkinav/include
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: SNESSolve_LS() line 167 in src/snes/impls/ls/ls.c
> [0]PETSC ERROR: SNESSolve() line 2407 in src/snes/interface/snes.c
> [0]PETSC ERROR: main() line 38 in src/snes/examples/tutorials/ex47cu.cu
> application called MPI_Abort(MPI_COMM_WORLD, 72) - process 0
>
> Then I tried to find the place in source with the problem, I changed
> the function in struct ApplyStencil to
>
> void operator()(Tuple t) { thrust::get<0>(t) = 1; }
>
> Result:
> [0]PETSC ERROR: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Floating point exception!
> [0]PETSC ERROR: Infinite or not-a-number generated in mdot, entry 0!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Development HG revision:
> d3e10315d68b1dd5481adb2889c7d354880da362  HG Date: Wed Apr 20 21:03:56
> 2011 -0500
> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
> [0]PETSC ERROR: See docs/index.html for manual pages.
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: ex47cu on a arch-linu named cn11 by kukushkinav Fri
> Apr 22 18:58:04 2011
> [0]PETSC ERROR: Libraries linked from /home/kukushkinav/lib
> [0]PETSC ERROR: Configure run at Thu Apr 21 19:18:22 2011
> [0]PETSC ERROR: Configure options --prefix=/home/kukushkinav
> --with-blas-lapack-dir=/opt/intel/composerxe-2011.0.084/mkl
> --with-mpi-dir=/opt/intel/impi/4.0.1.007/intel64/bin --with-cuda=1
> --with-cusp=1 --with-thrust=1
> --with-thrust-dir=/home/kukushkinav/include
> --with-cusp-dir=/home/kukushkinav/include
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: VecMDot() line 1146 in src/vec/vec/interface/rvector.c
> [0]PETSC ERROR: KSPGMRESClassicalGramSchmidtOrthogonalization() line
> 66 in src/ksp/ksp/impls/gmres/borthog2.c
> [0]PETSC ERROR: GMREScycle() line 161 in src/ksp/ksp/impls/gmres/gmres.c
> [0]PETSC ERROR: KSPSolve_GMRES() line 244 in
> src/ksp/ksp/impls/gmres/gmres.c
> [0]PETSC ERROR: KSPSolve() line 426 in src/ksp/ksp/interface/itfunc.c
> [0]PETSC ERROR: SNES_KSPSolve() line 3107 in src/snes/interface/snes.c
> [0]PETSC ERROR: SNESSolve_LS() line 190 in src/snes/impls/ls/ls.c
> [0]PETSC ERROR: SNESSolve() line 2407 in src/snes/interface/snes.cС
> уважением,
> Евгений
> [0]PETSC ERROR: main() line 38 in src/snes/examples/tutorials/ex47cu.cu
>
> RedHat 5.5, Cuda 3.2
>
> Question1: Is it my problem or a bug of the algorithm?
>
> Question2: Where can I find simple doc or example, which describe how
> to solve sparse linear systems on multi-GPU systems using PETSc?
>
>
> --
> Best regards,
> Eugene
>
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