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

[Rajeev Thakur]

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
>