[petsc-users] How to understand these error messages

[Fande Kong]

Thanks Jed,

I added your code into the petsc. I run my code with 10240 cores. I got the
following error messages:

[6724]PETSC ERROR: --------------------- Error Message
------------------------------------
[6724]PETSC ERROR: Petsc has generated inconsistent data!
[6724]PETSC ERROR: Negative MPI source: stash->nrecvs=8 i=11
MPI_SOURCE=-32766 MPI_TAG=-32766 MPI_ERROR=20613892!
[6724]PETSC ERROR:
------------------------------------------------------------------------
[6724]PETSC ERROR: Petsc Release Version 3.4.1, unknown
[6724]PETSC ERROR: See docs/changes/index.html for recent updates.
[6724]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[6724]PETSC ERROR: See docs/index.html for manual pages.
[6724]PETSC ERROR:
------------------------------------------------------------------------
[6724]PETSC ERROR: ./linearElasticity on a arch-linux2-cxx-debug named
ys4350 by fandek Sun Jun 23 02:58:23 2013
[6724]PETSC ERROR: Libraries linked from
/glade/p/work/fandek/petsc/arch-linux2-cxx-debug/lib
[6724]PETSC ERROR: Configure run at Sun Jun 23 00:46:05 2013
[6724]PETSC ERROR: Configure options --with-valgrind=1 --with-clanguage=cxx
--with-shared-libraries=1 --with-dynamic-loading=1
--download-f-blas-lapack=1 --with-mpi=1 --d
ownload-parmetis=1 --download-metis=1 --with-64-bit-indices=1
--download-netcdf=1 --download-exodusii=1 --download-ptscotch=1
--download-hdf5=1 --with-debugging=yes
[6724]PETSC ERROR:
------------------------------------------------------------------------
[6724]PETSC ERROR: MatStashScatterGetMesg_Private() line 633 in
/src/mat/utilsmatstash.c
[6724]PETSC ERROR: MatAssemblyEnd_MPIAIJ() line 676 in
/src/mat/impls/aij/mpimpiaij.c
[6724]PETSC ERROR: MatAssemblyEnd() line 4939 in /src/mat/interfacematrix.c
[6724]PETSC ERROR: SpmcsDMMeshCreatVertexMatrix() line 65 in meshreorder.cpp
[6724]PETSC ERROR: SpmcsDMMeshReOrderingMeshPoints() line 125 in
meshreorder.cpp
[6724]PETSC ERROR: CreateProblem() line 59 in preProcessSetUp.cpp
[6724]PETSC ERROR: DMmeshInitialize() line 78 in mgInitialize.cpp
[6724]PETSC ERROR: main() line 71 in linearElasticity3d.cpp
Abort(77) on node 6724 (rank 6724 in comm 1140850688): application called
MPI_Abort(MPI_COMM_WORLD, 77) - process 6724
[2921]PETSC ERROR: --------------------- Error Message
------------------------------------
[2921]PETSC ERROR: Petsc has generated inconsistent data!
[2921]PETSC ERROR: Negative MPI source: stash->nrecvs=15 i=3
MPI_SOURCE=-32766 MPI_TAG=-32766 MPI_ERROR=3825270!
[2921]PETSC ERROR:
------------------------------------------------------------------------
[2921]PETSC ERROR: Petsc Release Version 3.4.1, unknown
[2921]PETSC ERROR: See docs/changes/index.html for recent updates.
[2921]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[2921]PETSC ERROR: See docs/index.html for manual pages.
[2921]PETSC ERROR:
------------------------------------------------------------------------
[2921]PETSC ERROR: ./linearElasticity on a arch-linux2-cxx-debug named
ys0270 by fandek Sun Jun 23 02:58:23 2013
[2921]PETSC ERROR: Libraries linked from
/glade/p/work/fandek/petsc/arch-linux2-cxx-debug/lib
[2921]PETSC ERROR: Configure run at Sun Jun 23 00:46:05 2013
[2921]PETSC ERROR: Configure options --with-valgrind=1 --with-clanguage=cxx
--with-shared-libraries=1 --with-dynamic-loading=1
--download-f-blas-lapack=1 --with-mpi=1 --download-parmetis=1
--download-metis=1 --with-64-bit-indices=1 --download-netcdf=1
--download-exodusii=1 --download-ptscotch=1 --download-hdf5=1
--with-debugging=yes
[2921]PETSC ERROR:
------------------------------------------------------------------------
[2921]PETSC ERROR: MatStashScatterGetMesg_Private() line 633 in
/src/mat/utilsmatstash.c
[2921]PETSC ERROR: MatAssemblyEnd_MPIAIJ() line 676 in
/src/mat/impls/aij/mpimpiaij.c
[2921]PETSC ERROR: MatAssemblyEnd() line 4939 in /src/mat/interfacematrix.c
[2921]PETSC ERROR: SpmcsDMMeshCreatVertexMatrix() line 65 in meshreorder.cpp
[2921]PETSC ERROR: SpmcsDMMeshReOrderingMeshPoints() line 125 in
meshreorder.cpp
[2921]PETSC ERROR: CreateProblem() line 59 in preProcessSetUp.cpp
[2921]PETSC ERROR: DMmeshInitialize() line 78 in mgInitialize.cpp
[2921]PETSC ERROR: main() line 71 in linearElasticity3d.cpp
:

On Fri, Jun 21, 2013 at 4:33 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Fande Kong <fd.kong at siat.ac.cn> writes:
>
> > The code works well with less cores. And It also works well with
> > petsc-3.3-p7. But it does not work with petsc-3.4.1. Thus, If you can
> check
> > the differences between petsc-3.3-p7 and petsc-3.4.1, you can figure out
> > the reason.
>
> That is one way to start debugging, but there are no changes to the core
> MatStash code, and many, many changes to PETSc in total.  The relevant
> snippet of code is here:
>
>     if (stash->reproduce) {
>       i    = stash->reproduce_count++;
>       ierr = MPI_Wait(stash->recv_waits+i,&recv_status);CHKERRQ(ierr);
>     } else {
>       ierr =
> MPI_Waitany(2*stash->nrecvs,stash->recv_waits,&i,&recv_status);CHKERRQ(ierr);
>     }
>     if (recv_status.MPI_SOURCE < 0)
> SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Negative MPI source!");
>
> So MPI returns correctly (stash->reproduce will be FALSE unless you
> changed it).  You could change the line above to the following:
>
>   if (recv_status.MPI_SOURCE < 0)
> SETERRQ5(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Negative MPI source:
> stash->nrecvs=%D i=%d MPI_SOURCE=%d MPI_TAG=%d MPI_ERROR=%d",
>
> stash->nrecvs,i,recv_status.MPI_SOURCE,recv_status.MPI_TAG,recv_status.MPI_ERROR);
>
>
> It would help to debug --with-debugging=1, so that more checks for
> corrupt data are performed.  You can still make the compiler optimize if
> it takes a long time to reach the error condition.
>



-- 
Fande Kong
ShenZhen Institutes of Advanced Technology
Chinese Academy of Sciences
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