[petsc-users] valgrind

[Matthew Knepley]

On Tue, Aug 2, 2011 at 5:38 PM, Kuhlemann, Verena <vkuhlem at emory.edu> wrote:

> So, the first real error that I get is
>
>  Invalid write of size 4
> ==24909==    at 0x9B3B9F: Moc_ComputePartitionParams__ (kwayrefine.c:215)
> ==24909==    by 0x9A1D28: Moc_Global_Partition__ (kmetis.c:231)
> ==24909==    by 0x9A1D00: Moc_Global_Partition__ (kmetis.c:228)
> ==24909==    by 0x9A1D00: Moc_Global_Partition__ (kmetis.c:228)
> ==24909==    by 0x9A1D00: Moc_Global_Partition__ (kmetis.c:228)
> ==24909==    by 0x9A1D00: Moc_Global_Partition__ (kmetis.c:228)
> ==24909==    by 0x9A1619: ParMETIS_V3_PartKway (kmetis.c:137)
> ==24909==    by 0x557AC8: MatPartitioningApply_Parmetis (pmetis.c:97)
> ==24909==    by 0x554058: MatPartitioningApply (partition.c:236)
> ==24909==    by 0x404DE2: main (runtests.c:99)
>
> Any ideas why?
>

ParMetis is not robust to problems with the input (we are upgrading to the
recent release
which is supposed to do more checking). I believe it can fail if you have
empty partitions.
I would check the input.

   Matt


> I will try to use --download-mpich for valgrind debugging./
>
> Thanks,
>
> Verena
> ________________________________________
> From: petsc-users-bounces at mcs.anl.gov [petsc-users-bounces at mcs.anl.gov] on
> behalf of Satish Balay [balay at mcs.anl.gov]
> Sent: Tuesday, August 02, 2011 1:35 PM
> To: PETSc users list
> Subject: Re: [petsc-users] valgrind
>
> Also suggest using --download-mpich - for valgrind debugging. [it gives
> you a valgrind clean mpich]
>
>
> Satish
>
> On Tue, 2 Aug 2011, Matthew Knepley wrote:
>
> > On Tue, Aug 2, 2011 at 5:06 PM, Kuhlemann, Verena <vkuhlem at emory.edu>
> wrote:
> >
> > >  Hi,
> > >
> > >  I am trying to find an error in my program with valgrind.
> > > The first message that I get is the following:
> > >
> >
> > No, MPICH is doing something that valgrind does not understand with
> memory.
> > You can usually
> > ignore anything that goes back into MPI.
> >
> >    Matt
> >
> >
> > >  Syscall param write(buf) points to uninitialised byte(s)
> > > ==22395== Syscall param write(buf) points to uninitialised byte(s)
> > > ==22393==    at 0x73D92C0: __write_nocancel (in /lib64/libc-2.5.so)
> > > ==22393==    by 0x7A76283: ibv_cmd_modify_qp (in
> > > /usr/lib64/libibverbs.so.1.0.0)
> > > ==22393==    by 0x88B742A: ??? (in /usr/lib64/libmlx4-rdmav2.so)
> > > ==22393==    by 0x7A7A363: ibv_modify_qp (in
> > > /usr/lib64/libibverbs.so.1.0.0)
> > > ==22393==    by 0x67A3DDF: MPID_VIA_Init (viainit.c:1014)
> > > ==22393==    by 0x67826BB: MPID_Init (mpid_init.c:66)
> > > ==22393==    by 0x677438E: MPIR_Init (initutil.c:279)
> > > ==22393==    by 0x432732: PetscInitialize (pinit.c:561)
> > > ==22395==    at 0x73D92C0: __write_nocancel (in /lib64/libc-2.5.so)
> > > ==22395==    by 0x7A76283: ibv_cmd_modify_qp (in
> > > /usr/lib64/libibverbs.so.1.0.0)
> > > ==22395==    by 0x88B742A: ??? (in /usr/lib64/libmlx4-rdmav2.so)
> > > ==22395==    by 0x7A7A363: ibv_modify_qp (in
> > > /usr/lib64/libibverbs.so.1.0.0)
> > > ==22395==    by 0x67A3DDF: MPID_VIA_Init (viainit.c:1014)
> > > ==22395==    by 0x67826BB: MPID_Init (mpid_init.c:66)
> > > ==22395==    by 0x677438E: MPIR_Init (initutil.c:279)
> > > ==22395==    by 0x432732: PetscInitialize (pinit.c:561)
> > > ==22395==    by 0x4046FC: main (runtests.c:48)
> > > ==22395==  Address 0x7feffef78 is on thread 1's stack
> > >
> > >  I am not sure what this is suppose to tell me. Is the something wrong
> > > with my PetscInitialize?
> > >
> > >  Thanks for the help,
> > >
> > >  Verena
> > >
> > >
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-- 
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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