On Sun, May 6, 2012 at 7:28 AM, Alexander Grayver <agrayver at gfz-potsdam.de>wrote:
> Hello, > > I use KSP and random rhs to compute largest singular value: > 1) Is this the whole program? If not, this can be caused by memory corruption somewhere else. This is what I suspect. 2) You can put in CHKMEMQ; throughout the code to find exactly where the memory corruption happens. Matt > ! create solver and set options for singular value estimation > call KSPCreate(MPI_COMM_WORLD,ksp,**ierr);CHKERRQ(ierr) > call KSPSetType(ksp,KSPGMRES,ierr);**CHKERRQ(ierr) > call KSPSetTolerances(ksp,**solvertol,PETSC_DEFAULT_** > DOUBLE_PRECISION,PETSC_**DEFAULT_DOUBLE_PRECISION,its,** > ierr);CHKERRQ(ierr) > call KSPGMRESSetRestart(ksp, its, ierr);CHKERRQ(ierr) > call KSPSetComputeSingularValues(**ksp, flg, ierr);CHKERRQ(ierr) > call KSPSetFromOptions(ksp,ierr);**CHKERRQ(ierr) > > ! generate random RHS > call PetscRandomCreate(PETSC_COMM_**WORLD,rctx,ierr) > call PetscRandomSetFromOptions(**rctx,ierr) > call VecSetRandom(b,rctx,ierr) > > !no preconditioning > call KSPGetPC(ksp,pc,ierr);CHKERRQ(**ierr) > call PCSetType(pc,PCNONE,ierr);**CHKERRQ(ierr) > call KSPSetOperators(ksp,A,A,SAME_**PRECONDITIONER,ierr);CHKERRQ(**ierr) > !solve system > call KSPSolve(ksp,b,x,ierr);**CHKERRQ(ierr) > call KSPComputeExtremeSingularValue**s(ksp, smax, smin, > ierr);CHKERRQ(ierr) > > call KSPDestroy(ksp,ierr);CHKERRQ(**ierr) > > However it crashes: > > [1]PETSC ERROR: ------------------------------** > ------------------------------**------------ > [1]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, > probably memory access out of range > [1]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger > [1]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/** > documentation/faq.html#**valgrind[1]PETSC<http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind[1]PETSC>ERROR: > or try > http://valgrind.org on GNU/linux and Apple Mac OS X to find memory > corruption errors > [1]PETSC ERROR: PetscMallocValidate: error detected at > PetscDefaultSignalHandler() line 157 in /home/lib/petsc-dev1/src/sys/** > error/signal.c > [1]PETSC ERROR: Memory at address 0x4aa3f00 is corrupted > [1]PETSC ERROR: Probably write past beginning or end of array > [1]PETSC ERROR: Last intact block allocated in KSPSetUp_GMRES() line 73 in > /home/lib/petsc-dev1/src/ksp/**ksp/impls/gmres/gmres.c > [1]PETSC ERROR: --------------------- Error Message > ------------------------------**------ > [1]PETSC ERROR: Memory corruption! > [1]PETSC ERROR: ! > [1]PETSC ERROR: ------------------------------** > ------------------------------**------------ > [1]PETSC ERROR: Petsc Development HG revision: > f3c119f7ddbfee243b51907a90acab**15127ccb39 HG Date: Sun Apr 29 21:37:29 > 2012 -0500 > [1]PETSC ERROR: See docs/changes/index.html for recent updates. > [1]PETSC ERROR: See docs/faq.html for hints about trouble shooting. > [1]PETSC ERROR: See docs/index.html for manual pages. > [1]PETSC ERROR: ------------------------------** > ------------------------------**------------ > [1]PETSC ERROR: /home/prog on a openmpi-i named node207 by user Sun May 6 > 12:58:24 2012 > [1]PETSC ERROR: Libraries linked from /home/lib/petsc-dev1/openmpi-** > intel-complex-debug-f/lib > [1]PETSC ERROR: Configure run at Mon Apr 30 10:20:49 2012 > [1]PETSC ERROR: Configure options --with-blacs-include=/opt/** > intel/Compiler/11.1/072/mkl/**include --with-blacs-lib=/opt/intel/** > Compiler/11.1/072/mkl/lib/**em64t/libmkl_blacs_openmpi_**lp64.a > --with-blas-lapack-lib="[/opt/**intel/Compiler/11.1/072/mkl/** > lib/em64t/libmkl_intel_lp64.a,**/opt/intel/Compiler/11.1/072/** > mkl/lib/em64t/libmkl_intel_**thread.a,/opt/intel/Compiler/** > 11.1/072/mkl/lib/em64t/libmkl_**core.a,/opt/intel/Compiler/11.**1/072/lib/intel64/libiomp5.a]" > --with-fortran-interfaces=1 --with-mpi-dir=/opt/mpi/intel/**openmpi-1.4.2 > --with-petsc-arch=openmpi-**intel-complex-debug-f --with-precision=double > --with-scalapack-include=/opt/**intel/Compiler/11.1/072/mkl/**include > --with-scalapack-lib=/opt/**intel/Compiler/11.1/072/mkl/** > lib/em64t/libmkl_scalapack_**lp64.a --with-scalar-type=complex --with-x=0 > PETSC_ARCH=openmpi-intel-**complex-debug-f > [1]PETSC ERROR: ------------------------------** > ------------------------------**------------ > [1]PETSC ERROR: PetscMallocValidate() line 138 in > /home/lib/petsc-dev1/src/sys/**memory/mtr.c > [1]PETSC ERROR: PetscDefaultSignalHandler() line 157 in > /home/lib/petsc-dev1/src/sys/**error/signal.c > > > Call stack from debugger: > > opal_memory_ptmalloc2_int_**free, FP=7fffd4765300 > opal_memory_ptmalloc2_free_**hook, FP=7fffd4765330 > PetscFreeAlign, FP=7fffd4765370 > PetscTrFreeDefault, FP=7fffd4765520 > KSPReset_GMRES, FP=7fffd4765740 > KSPReset, FP=7fffd4765840 > KSPDestroy, FP=7fffd47659a0 > kspdestroy_, FP=7fffd47659d0 > > > Any ideas? > > Thanks. > > -- > Regards, > Alexander > > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... 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