[mpich2-dev] nesting level warning with MPI_File_preallocate(fh, 0)

[Lisandro Dalcin]

On Tue, Dec 9, 2008 at 7:02 PM, Rajeev Thakur <thakur at mcs.anl.gov> wrote:
> I guess that's because you have built a version with memory tracing turned
> on.

Of course! What I'm trying to point is that some keyval pairs are
being leaked internally.


> Rajeev
>
>> -----Original Message-----
>> From: mpich2-dev-bounces at mcs.anl.gov
>> [mailto:mpich2-dev-bounces at mcs.anl.gov] On Behalf Of Lisandro Dalcin
>> Sent: Tuesday, December 09, 2008 3:01 PM
>> To: mpich2-dev at mcs.anl.gov
>> Subject: Re: [mpich2-dev] nesting level warning with
>> MPI_File_preallocate(fh,0)
>>
>> Thanks, Rajeev. I'm not using 1.1 yet for production, just wanted to
>> point the issue.
>>
>> BTW, here you have another problem I'm experiencing. I get the
>> following warning (see last line). Sorry again for not diving into the
>> sources and providing the patch. I'm really busy with the next
>> PETSc/SLEPc releases, and my personal mpi&python-related projects.
>>
>>
>> $ cat testfile.c
>> #include <mpi.h>
>> int main( int argc, char ** argv ) {
>>   MPI_File fh;
>>   int amode = MPI_MODE_RDWR | MPI_MODE_CREATE |
>> MPI_MODE_DELETE_ON_CLOSE;
>>   MPI_Init(&argc, &argv);
>>   MPI_File_open(MPI_COMM_WORLD, "/tmp/datafile",
>>               amode, MPI_INFO_NULL, &fh);
>>   MPI_File_close(&fh);
>>   MPI_Finalize();
>>   return 0;
>> }
>>
>> $ mpicc testfile.c
>>
>> $ ./a.out
>> In direct memory block for handle type ATTRIBUTE KEY, 2 handles are
>> still allocated
>>
>>
>>
>>
>>
>> On Tue, Dec 9, 2008 at 6:43 PM, Rajeev Thakur
>> <thakur at mcs.anl.gov> wrote:
>> > In src/mpi/romio/mpi-io/prealloc.c, change line 77
>> >      if (size == 0) return MPI_SUCCESS;
>> > to
>> >      if (size == 0) goto fn_exit;
>> >
>> > That should fix it.
>> >
>> > Rajeev
>> >
>> >
>> >> -----Original Message-----
>> >> From: mpich2-dev-bounces at mcs.anl.gov
>> >> [mailto:mpich2-dev-bounces at mcs.anl.gov] On Behalf Of
>> Lisandro Dalcin
>> >> Sent: Tuesday, December 09, 2008 11:28 AM
>> >> To: mpich2-dev at mcs.anl.gov
>> >> Subject: [mpich2-dev] nesting level warning with
>> >> MPI_File_preallocate(fh, 0)
>> >>
>> >> Consider the following Python snipet (sorry, really busy to write
>> >> C/C++, I used mpi4py)
>> >>
>> >> from mpi4py import MPI
>> >>
>> >> amode = MPI.MODE_RDWR | MPI.MODE_CREATE | MPI.MODE_DELETE_ON_CLOSE
>> >>
>> >> fh = MPI.File.Open(MPI.COMM_WORLD,
>> >>                    '/tmp/datafile', amode,
>> >>                    MPI.INFO_NULL)
>> >>
>> >> N = 0
>> >> fh.Preallocate(N)
>> >> size = fh.Get_size()
>> >> assert size == N
>> >>
>> >> fh.Close()
>> >> print 'Bye!!!'
>> >>
>> >>
>> >> Then, when I run the code (1.0.8 and --enable-g=all), I get
>> >> the following output
>> >>
>> >> Bye!!!
>> >> Unexpected value for nesting level = 1
>> >> Nest stack is:
>> >>       [0] :0
>> >>
>> >> So the warning is likely emitted at MPI_Finalize().
>> >>
>> >> If I try to preallocate sizes larger than 0, then the warning
>> >> does not appear.
>> >>
>> >>
>> >>
>> >>
>> >> --
>> >> Lisandro Dalcín
>> >> ---------------
>> >> Centro Internacional de Métodos Computacionales en
>> Ingeniería (CIMEC)
>> >> Instituto de Desarrollo Tecnológico para la Industria
>> Química (INTEC)
>> >> Consejo Nacional de Investigaciones Científicas y Técnicas
>> (CONICET)
>> >> PTLC - Güemes 3450, (3000) Santa Fe, Argentina
>> >> Tel/Fax: +54-(0)342-451.1594
>> >>
>> >
>> >
>>
>>
>>
>> --
>> Lisandro Dalcín
>> ---------------
>> Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
>> Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
>> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
>> PTLC - Güemes 3450, (3000) Santa Fe, Argentina
>> Tel/Fax: +54-(0)342-451.1594
>>
>
>



-- 
Lisandro Dalcín
---------------
Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
PTLC - Güemes 3450, (3000) Santa Fe, Argentina
Tel/Fax: +54-(0)342-451.1594