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

[Satish Balay]

That would be wierd. Currently configure defaults to sm_10 for single
precision, and sm_13 for double precision. [I've verified this again]

can you send configure.log [without the cuda-arch option] - to
petsc-maint?


Satish


On Mon, 25 Apr 2011, Евгений Козлов wrote:

> Yes, this was the problem. Now it works.
> 
> Thank you.
> 
> 2011/4/25 Victor Minden <victorminden at gmail.com>:
> > 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 --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
> >
> >
> 
> 
> 
>