[petsc-users] DOF in DMDACreate3d and staggered grid
Matthew Knepley
knepley at gmail.com
Mon Jun 18 20:52:44 CDT 2012
On Mon, Jun 18, 2012 at 7:30 PM, TAY wee-beng <zonexo at gmail.com> wrote:
>
> On 17/6/2012 2:33 PM, Jed Brown wrote:
>
> On Sun, Jun 17, 2012 at 7:26 AM, TAY wee-beng <zonexo at gmail.com> wrote:
>
>>
>> On 16/6/2012 9:24 AM, Jed Brown wrote:
>>
>> It depends how you want to solve the problem. I usually group all dofs
>> together. There is a 2D Stokes+Thermodynamics example in SNES ex30 (or 31?).
>>
>>
>> I tried to understand ex30. I have some questions since it's in C and
>> I'm using to Fortran programming.
>>
>
> This looks about right, see src/dm/examples/tutorials/ex11f90.F.
>
>
> I tried to build and run ex11f90 in linux. However, it's not working:
>
> I have attached the run and valgrind output:
>
It appears to be a problem with your MPI.
Matt
> run output:
> *
> [wtay at hpc12:tutorials]$ ./ex11f90
> [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: --------------------- Error Message
> ------------------------------------
> [0]PETSC ERROR: Signal received!
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: Petsc Development HG revision:
> f3b998b41b349e16d47fe42b0e223d3462737e05 HG Date: Fri Jun 15 17:50:32 2012
> -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: ./ex11f90 on a petsc-3.3 named hpc12 by wtay Tue Jun 19
> 03:22:52 2012
> [0]PETSC ERROR: Libraries linked from
> /home/wtay/Lib/petsc-3.3-dev_shared_debug/lib
> [0]PETSC ERROR: Configure run at Sun Jun 17 16:51:29 2012
> [0]PETSC ERROR: Configure options --with-mpi-dir=/opt/openmpi-1.5.3/
> --with-blas-lapack-dir=/opt/intelcpro-11.1.059/mkl/lib/em64t/
> --with-debugging=1 --download-hypre=1
> --prefix=/home/wtay/Lib/petsc-3.3-dev_shared_debug --known-mpi-shared=1
> --with-shared-libraries
> [0]PETSC ERROR:
> ------------------------------------------------------------------------
> [0]PETSC ERROR: User provided function() line 0 in unknown directory
> unknown file
> --------------------------------------------------------------------------
> MPI_ABORT was invoked on rank 0 in communicator MPI_COMM_WORLD
> with errorcode 59.
>
> NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
> You may or may not see output from other processes, depending on
> exactly when Open MPI kills them.
> --------------------------------------------------------------------------
> *
>
> valgrind output:
> *
> ==6027== Memcheck, a memory error detector
> ==6027== Copyright (C) 2002-2011, and GNU GPL'd, by Julian Seward et al.
> ==6027== Using Valgrind-3.7.0 and LibVEX; rerun with -h for copyright info
> ==6027== Command: ex11f90
> ==6027==
> ==6027== Invalid read of size 8
> ==6027== at 0xA60148D: _wordcopy_fwd_dest_aligned (in /lib64/
> libc-2.12.so)
> ==6027== by 0xA5FB11D: __GI_memmove (in /lib64/libc-2.12.so)
> ==6027== by 0xA6027DB: argz_insert (in /lib64/libc-2.12.so)
> ==6027== by 0x95CAF25: lt_argz_insert (ltdl.c:1679)
> ==6027== by 0x95CB7D0: foreachfile_callback (ltdl.c:1718)
> ==6027== by 0x95CB4F1: foreach_dirinpath (ltdl.c:710)
> ==6027== by 0x95CB580: lt_dlforeachfile (ltdl.c:1865)
> ==6027== by 0x95DB999: mca_base_component_find
> (mca_base_component_find.c:301)
> ==6027== by 0x95DC4B0: mca_base_components_open
> (mca_base_components_open.c:128)
> ==6027== by 0x95F7CE7: opal_paffinity_base_open
> (paffinity_base_open.c:112)
> ==6027== by 0x95C39FE: opal_init (opal_init.c:307)
> ==6027== by 0x95815A4: orte_init (orte_init.c:78)
> ==6027== Address 0xb39d9a8 is 40 bytes inside a block of size 43 alloc'd
> ==6027== at 0x4C267BA: malloc (vg_replace_malloc.c:263)
> ==6027== by 0x95CA358: lt__malloc (lt__alloc.c:54)
> ==6027== by 0x95CB751: foreachfile_callback (ltdl.c:1764)
> ==6027== by 0x95CB4F1: foreach_dirinpath (ltdl.c:710)
> ==6027== by 0x95CB580: lt_dlforeachfile (ltdl.c:1865)
> ==6027== by 0x95DB999: mca_base_component_find
> (mca_base_component_find.c:301)
> ==6027== by 0x95DC4B0: mca_base_components_open
> (mca_base_components_open.c:128)
> ==6027== by 0x95F7CE7: opal_paffinity_base_open
> (paffinity_base_open.c:112)
> ==6027== by 0x95C39FE: opal_init (opal_init.c:307)
> ==6027== by 0x95815A4: orte_init (orte_init.c:78)
> ==6027== by 0x95432AE: ompi_mpi_init (ompi_mpi_init.c:350)
> ==6027== by 0x955938F: PMPI_Init (pinit.c:84)
> ==6027==
> ==6027== Syscall param writev(vector[...]) points to uninitialised byte(s)
> ==6027== at 0xA65692B: writev (in /lib64/libc-2.12.so)
> ==6027== by 0xC9A2C56: mca_oob_tcp_msg_send_handler (oob_tcp_msg.c:249)
> ==6027== by 0xC9A417C: mca_oob_tcp_peer_send (oob_tcp_peer.c:204)
> ==6027== by 0xC9A67FC: mca_oob_tcp_send_nb (oob_tcp_send.c:167)
> ==6027== by 0xC3953B5: orte_rml_oob_send (rml_oob_send.c:136)
> ==6027== by 0xC3955FF: orte_rml_oob_send_buffer (rml_oob_send.c:270)
> ==6027== by 0xCDB1E87: modex (grpcomm_bad_module.c:573)
> ==6027== by 0x95436F1: ompi_mpi_init (ompi_mpi_init.c:682)
> ==6027== by 0x955938F: PMPI_Init (pinit.c:84)
> ==6027== by 0x8AB4FF4: MPI_INIT (pinit_f.c:75)
> ==6027== by 0x50ED97E: petscinitialize_ (zstart.c:299)
> ==6027== by 0x40881C: MAIN__ (ex11f90.F:43)
> ==6027== Address 0xed30cd1 is 161 bytes inside a block of size 256 alloc'd
> ==6027== at 0x4C268B2: realloc (vg_replace_malloc.c:632)
> ==6027== by 0x95C4F22: opal_dss_buffer_extend
> (dss_internal_functions.c:63)
> ==6027== by 0x95C5A64: opal_dss_copy_payload (dss_load_unload.c:164)
> ==6027== by 0x95A1246: orte_grpcomm_base_pack_modex_entries
> (grpcomm_base_modex.c:861)
> ==6027== by 0xCDB1E3C: modex (grpcomm_bad_module.c:563)
> ==6027== by 0x95436F1: ompi_mpi_init (ompi_mpi_init.c:682)
> ==6027== by 0x955938F: PMPI_Init (pinit.c:84)
> ==6027== by 0x8AB4FF4: MPI_INIT (pinit_f.c:75)
> ==6027== by 0x50ED97E: petscinitialize_ (zstart.c:299)
> ==6027== by 0x40881C: MAIN__ (ex11f90.F:43)
> ==6027== by 0x4087AB: main (in
> /home/wtay/Codes/petsc-dev/src/dm/examples/tutorials/ex11f90)
> ==6027==
> ==6027== Invalid read of size 8
> ==6027== at 0x50FC6D8: vecview_ (zvectorf.c:56)
> ==6027== by 0x408A05: MAIN__ (ex11f90.F:56)
> ==6027== by 0xEE1CC2F: ???
> ==6027== by 0xEE5A0AF: ???
> ==6027== by 0x6F5C9F: ??? (in
> /home/wtay/Codes/petsc-dev/src/dm/examples/tutorials/ex11f90)
> ==6027== by 0x4962FF: ??? (in
> /home/wtay/Codes/petsc-dev/src/dm/examples/tutorials/ex11f90)
> ==6027== by 0x6F5C9F: ??? (in
> /home/wtay/Codes/petsc-dev/src/dm/examples/tutorials/ex11f90)
> ==6027== by 0x7FEFFFC13: ???
> ==6027== Address 0xfffffffffffffeb8 is not stack'd, malloc'd or
> (recently) free'd
> ==6027== *
>
>
>
>
>
>
>>
>> Supposed I have a field - u,v,w,p, so in order to use them, I do the
>> following:
>> *
>> type field
>>
>> real u,v,w,p
>>
>> end type field
>>
>> type(field), pointer :: field1(:,:,:) -> make a derived variable*
>>
>> Also:
>> *
>> Vec field_local,field_global
>>
>> call DMDACreate3d with dof = 4
>>
>> call DMCreateGlobalVector(da, field_local,ierr)
>>
>> call DMCreateLocalVector(da,field_global,ierr)
>>
>> call DMGetLocalVector(da, field_local,ierr) -> To insert values
>>
>> call DMDAVecGetArrayF90(da, field_local,field1,ierr)
>>
>> do k = zs, zs + zm - 1
>>
>> do j = ys, ys + ym -1
>>
>> do i = xs, xs + xm - 1
>>
>> field1(i,j,k)%u = ... -> evaluate u,v,w,p etc
>>
>> end do
>>
>> end do
>>
>> call DMDAVecRestoreArrayF90(da,field_local,field1,ierr)
>>
>> call DMLocalToGlobalBegin(da,field_local,INSERT_VALUES,field_global,ierr)
>>
>> call DMLocalToGlobalEnd(da,field_local,INSERT_VALUES,field_global,ierr)
>>
>> call DMRestoreLocalVector(da,field_local,ierr)*
>>
>> Is this the correct way?
>>
>> Also, supposed I now want to solve my u,v,w momentum eqns. Although
>> they're not coupled together, I believe it's faster if I assemble them into
>> 1 big matrix.
>>
>> So for Ax = b, x =
>> (field(1,1,1)%u,field(1,1,1)%v,field(1,1,1)%w,field(2,1,1)%u.... )
>>
>> For b, do I duplicate a Vec similar to field_local?
>>
>> What about matrix A? Do I use the MatSetValuesStencil?
>>
>
> Yes
>
>
>>
>> Lastly, the type field contains u,v,w and p. However, I'm only solving
>> u,v,w. Do I have to skip some values or use identity matrix to solve it?
>>
>
> Why not make a field that contains only u,v,w. I don't see what you're
> trying to do.
>
>
--
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
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