[petsc-dev] [GPU - slepc] Hands-on exercise 4 (SVD) not working with GPU and default configurations

[Jose E. Roman]

Yes, there seems to be a problem with the default SVD solver (SVDCROSS). I will fix it in the master branch in the next days. Meanwhile, you can run the example with -svd_type trlanczos

Thanks for reporting this.
Jose


> El 7/8/2015, a las 16:31, Leoni, Massimiliano <Massimiliano.Leoni at Rolls-Royce.com> escribió:
> 
> Hi everybody!
>  
> I kept experimenting with slepc and GPUs, and when I turned to SVD I found out that the hands-on exercise on SVD [#4] doesn’t run properly.
>  
> If I run it on CPU it works fine, whereas…
> $ mpirun -np 1 slepcSVD -file $SLEPC_DIR/share/slepc/datafiles/matrices/rdb200.petsc -bv_type vecs -mat_type aijcusp -on_error_abort
>  
> Singular value problem stored in file.
>  
> Reading REAL matrix from a binary file...
> [0]PETSC ERROR: BVScaleColumn() line 380 in /gpfs/rrcfd/rruk-students/apps/slepc/src/sys/classes/bv/interface/bvops.c Scalar value must be same on all processes, argument # 3
> [0]PETSC ERROR: ------------------------------------------------------------------------
> [0]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range
> [0]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger
> [0]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind
> [0]PETSC ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to find memory corruption errors
> [0]PETSC ERROR: likely location of problem given in stack below
> [0]PETSC ERROR: ---------------------  Stack Frames ------------------------------------
> [0]PETSC ERROR: Note: The EXACT line numbers in the stack are not available,
> [0]PETSC ERROR:       INSTEAD the line number of the start of the function
> [0]PETSC ERROR:       is given.
> [0]PETSC ERROR: [0] PetscAbortErrorHandler line 56 /gpfs/rrcfd/rruk-students/apps/petsc/src/sys/error/errabort.c
> [0]PETSC ERROR: [0] PetscError line 363 /gpfs/rrcfd/rruk-students/apps/petsc/src/sys/error/err.c
> [0]PETSC ERROR: [0] BVScaleColumn line 377 /gpfs/rrcfd/rruk-students/apps/slepc/src/sys/classes/bv/interface/bvops.c
> [0]PETSC ERROR: [0] EPSFullLanczos line 357 /gpfs/rrcfd/rruk-students/apps/slepc/src/eps/impls/krylov/epskrylov.c
> [0]PETSC ERROR: [0] EPSSolve_KrylovSchur_Symm line 41 /gpfs/rrcfd/rruk-students/apps/slepc/src/eps/impls/krylov/krylovschur/ks-symm.c
> [0]PETSC ERROR: [0] EPSSolve line 83 /gpfs/rrcfd/rruk-students/apps/slepc/src/eps/interface/epssolve.c
> [0]PETSC ERROR: [0] SVDSolve_Cross line 155 /gpfs/rrcfd/rruk-students/apps/slepc/src/svd/impls/cross/cross.c
> [0]PETSC ERROR: [0] SVDSolve line 92 /gpfs/rrcfd/rruk-students/apps/slepc/src/svd/interface/svdsolve.c
> [0]PETSC ERROR: User provided function() line 0 in  unknown file (null)
> --------------------------------------------------------------------------
> mpirun noticed that process rank 0 with PID 11264 on node gpu3 exited on signal 11 (Segmentation fault).
> --------------------------------------------------------------------------
>  
> I am using the same command line options that work just fine on hands-on exercises 1 and 2, which feature EPS solvers.
>  
> Any hint appreciated.
>  
> Best regards,
> Massimiliano Leoni
>  
> 
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