not enough memory?!

[Hong Zhang]

>>> 
>> 
> Thank you for your reply, since the problem I have is ICC took too much 
> memory, but I think I can fix it with reorderring the matrix.
>
> My matrix is SeqSBAIJ and ICC is used as preconditioner, I think the default 
> orderring is "natural", while I think nested-dissection is what I need.
>
> However, when I choose nested dissection with - *pc_factor_mat_ordering_type 
> nd, this is what comes out:

We do not support Matrix reordering for sbaij matrix format
because reordering sbaij matrix changes matrix data structure - very
expensive. You can use aij matrix, which enables efficient
matrix reordering. We support icc for aij matrix.
Note: using aij matrix should not increase much of memory,
only additional half of original sparse matrix entries are added.
All matrix operations for aij matrix can only be faster than sbaij's.

Hong

>
> [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/petsc-as/documentation/troubleshooting.html#Signal[0]PETSC 
> ERROR: or try http://valgrind.org on linux or man libgmalloc on Apple 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] SPARSEPACKfndsep line 50 src/mat/order/fndsep.c
> [0]PETSC ERROR: [0] SPARSEPACKgennd line 70 src/mat/order/gennd.c
> [0]PETSC ERROR: [0] MatOrdering_ND line 18 src/mat/order/spnd.c
> [0]PETSC ERROR: [0] MatGetOrdering line 187 src/mat/order/sorder.c
> [0]PETSC ERROR: [0] PCSetup_ICC line 113 src/ksp/pc/impls/factor/icc/icc.c
> [0]PETSC ERROR: [0] PCSetUp line 778 src/ksp/pc/interface/precon.c
> [0]PETSC ERROR: [0] KSPSolve line 305 src/ksp/ksp/interface/itfunc.c
> [0]PETSC ERROR: --------------------- Error Message 
> ------------------------------------
> [0]PETSC ERROR: Signal received!
> [0]PETSC ERROR: 
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Release Version 2.3.2, Patch 10, Wed Mar 28 19:13:22 
> CDT 2007 HG revision: d7298c71db7f5e767f359ae35d33cab3bed44428
> [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: bin/main on a linux-gnu named callisto by zhifeng Fri Nov 2 
> 16:00:58 2007
> [0]PETSC ERROR: Libraries linked from 
> /u/01/01/zhifeng/install/lib/linux-gnu-c-debug
> [0]PETSC ERROR: Configure run at Wed Aug 8 13:46:26 2007
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-fc=g77 
> --download-f-blas-lapack=1 --download-mpich=1 
> --prefix=/u/01/01/zhifeng/install --with-shared=0
> [0]PETSC ERROR: 
> ------------------------------------------------------------------------
> [0]PETSC ERROR: User provided function() line 0 in unknown directory unknown 
> file
> [unset]: aborting job:
> application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0
>
> PS: which reorderring schemas are symmetric?
>
> Thanks alot
>
> Best regards
> Zhifeng Sheng
> *
>
>
>
>
>
>