On Wed, Aug 17, 2011 at 6:55 PM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:
> Hi,
>
> I am getting the following valgrind complaint:
>
> ==27366== Syscall param writev(vector[...]) points to uninitialised byte(s)
> ==27366== at 0x6B5E789: writev (writev.c:56)
> ==27366== by 0x5081F8: MPIDU_Sock_writev (sock_immed.i:610)
> ==27366== by 0x50A4E3: MPIDI_CH3_iSendv (ch3_isendv.c:84)
> ==27366== by 0x4EE2F6: MPIDI_CH3_EagerContigIsend (ch3u_eager.c:509)
> ==27366== by 0x4F0284: MPID_Isend (mpid_isend.c:118)
> ==27366== by 0x4D7BCA: MPIC_Isend (helper_fns.c:210)
> ==27366== by 0xEC3ECD: MPIR_Alltoall (alltoall.c:420)
> ==27366== by 0xEC4730: PMPI_Alltoall (alltoall.c:685)
> ==27366== by 0xE38B3D: SetUp__ (setup.c:122)
> ==27366== by 0xE3938C: PartitionSmallGraph__ (weird.c:39)
> ==27366== by 0xE36678: ParMETIS_V3_PartKway (kmetis.c:131)
> ==27366== by 0x6A0004: MatPartitioningApply_Parmetis (pmetis.c:97)
> ==27366== by 0x69C600: MatPartitioningApply (partition.c:236)
> ==27366== by 0x519266: PetscSolver::LoadMesh(std::string const&)
> (PetscSolver.cxx:415)
> ==27366== by 0x4C1801: CD3T10_BOX::CD3T10_BOX() (cd3t10mpi_main.cxx:64)
> ==27366== by 0x4C1318: main (cd3t10mpi_main.cxx:673)
> ==27366== Address 0xc635afc is 12 bytes inside a block of size 72 alloc'd
> ==27366== at 0x4C28FAC: malloc (vg_replace_malloc.c:236)
> ==27366== by 0xE4963A: GKmalloc__ (util.c:151)
> ==27366== by 0xE44AB1: PreAllocateMemory__ (memory.c:38)
> ==27366== by 0xE3655B: ParMETIS_V3_PartKway (kmetis.c:116)
> ==27366== by 0x6A0004: MatPartitioningApply_Parmetis (pmetis.c:97)
> ==27366== by 0x69C600: MatPartitioningApply (partition.c:236)
> ==27366== by 0x519266: PetscSolver::LoadMesh(std::string const&)
> (PetscSolver.cxx:415)
> ==27366== by 0x4C1801: CD3T10_BOX::CD3T10_BOX() (cd3t10mpi_main.cxx:64)
> ==27366== by 0x4C1318: main (cd3t10mpi_main.cxx:673)
>
>
> A few lines around PetscSolver.cxx:415:
>
>
> MatPartitioning part;
> ierr = MatPartitioningCreate(PETSC_COMM_WORLD, &part);
> CHKERRQ(ierr);
> ierr = MatPartitioningSetAdjacency(part, adj); CHKERRQ(ierr);
> ierr = MatPartitioningSetNParts(part, np); CHKERRQ(ierr);
> ierr = MatPartitioningSetFromOptions(part); CHKERRQ(ierr);
> IS isTetAssignment;
> 415 ierr = MatPartitioningApply(part, &isTetAssignment); CHKERRQ(ierr);
> ierr = MatPartitioningDestroy(part); CHKERRQ(ierr);
> ierr = PetscGetTime(&time1); CHKERRQ(ierr);
>
>
>
> I do not immediately see anything wrong. Is this a real error? Did I
> overlook anything?
>
I think this is fine (its a common complaint of valgrind about MPICH).
Matt
> Many thanks for any opinions.
>
> Dominik
--
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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