[MPICH] error 66, MPI 1.04p1

[chong tan]

thanks for pointing that out.  However, in C++, it is
possible to call Isend without the MPI_Request
parameter, in which case there is nothing to wait for.
 If Isend should always be 'wait' ed for, then the
mpicxx header file should always require the Request
parameter.

The application I am working on performs inter-process
data exchange millions of time.  at any given time,
each process knows what to send/recieve from who.  I
am  them doing Isend, then Recv.  Once a process
recieve the data it need, it is free to move on. It
would be nice if Isend need not be waited for if there
is not Request parameter.

tan

--- Rajeev Thakur <thakur at mcs.anl.gov> wrote:

> An Isend is required to be completed by a Wait. The
> Wait frees the request
> object returned by the Isend.
> 
> Rajeev 
> 
> > -----Original Message-----
> > From: chong tan [mailto:chong_guan_tan at yahoo.com] 
> > Sent: Monday, August 28, 2006 5:40 PM
> > To: Rajeev Thakur; mpich-discuss at mcs.anl.gov
> > Subject: RE: [MPICH] error 66, MPI 1.04p1
> > 
> > 
> > Inst Recv supposed to force a sync ? 
> > tan
> > 
> > 
> > --- Rajeev Thakur <thakur at mcs.anl.gov> wrote:
> > 
> > > You are doing too many Isends without calling
> > > MPI_Wait to free the requests.
> > > You need to add MPI_Wait.
> > > 
> > > Rajeev 
> > > 
> > > > -----Original Message-----
> > > > From: owner-mpich-discuss at mcs.anl.gov 
> > > > [mailto:owner-mpich-discuss at mcs.anl.gov] On
> Behalf
> > > Of chong tan
> > > > Sent: Monday, August 28, 2006 3:10 PM
> > > > To: mpich-discuss at mcs.anl.gov
> > > > Subject: [MPICH] error 66, MPI 1.04p1
> > > > 
> > > > run this liktle test and get error 66.
> > > > 
> > > > #define MPICH_IGNORE_CXX_SEEK
> > > > #include "stdio.h"
> > > > #include "mpi.h"
> > > > 
> > > > 
> > > > 
> > > > #define COUNT           200000
> > > > #define DATA_SIZE       2048
> > > > 
> > > > main( int *argc, char ***argv )
> > > > {
> > > >    int  rank, nproc ;
> > > >    int  buf[ DATA_SIZE ] ;
> > > >    int  **inbuf ;
> > > >    int  i, j ;
> > > >    char *processor_name ;
> > > > 
> > > >    processor_name = new char [
> > > MPI_MAX_PROCESSOR_NAME
> > > > ] ;
> > > >    MPI_Init( argc, argv ) ;
> > > >    rank = MPI::COMM_WORLD.Get_rank( );
> > > >    nproc = MPI::COMM_WORLD.Get_size( );
> > > > 
> > > > 
> > > >    inbuf = (int **)new int* [ nproc ] ;
> > > >    for( i = 0 ; i < nproc ; i++ ) {
> > > >         inbuf[ i ] = new int[ DATA_SIZE ] ;
> > > >    }
> > > >    if( rank == 0 ) {
> > > >       for( i = 0 ; i < COUNT ; i++ ) {
> > > >         for( j = 1 ; j < nproc ; j++ ) {
> > > >             MPI::COMM_WORLD.Isend( buf,
> DATA_SIZE,
> > > > MPI::INT, j, 999 ) ;
> > > >             MPI::COMM_WORLD.Recv( inbuf[ j ],
> > > > DATA_SIZE, MPI::INT, j, 999 ) ;
> > > >         }
> > > >       }
> > > >       printf( "MASTER END..\n" ) ;
> > > >    } else {
> > > >       for( i = 0 ; i < COUNT ; i++ ) {
> > > >         for( j = 1 ; j < nproc ; j++ ) {
> > > >             MPI::COMM_WORLD.Isend( buf,
> DATA_SIZE,
> > > > MPI::INT, j, 999 ) ;
> > > >             MPI::COMM_WORLD.Recv( inbuf[ j ],
> > > > DATA_SIZE, MPI::INT, j, 999 ) ;
> > > >         }
> > > >       }
> > > >       printf( "SLAGE %d END..\n", rank ) ;
> > > >    }
> > > >    MPI::Finalize() ;
> > > > }
> > > > 
> > > > mpicxx main.cc
> > > > mpiexec -n 2 a.out
> > > > INTERNAL ERROR: Invalid error class (66)
> > > encountered
> > > > while returning from
> > > > MPI_Recv.  Please file a bug report.  No error
> > > stack
> > > > is available.
> > > > [cli_0]: aborting job:
> > > > Fatal error in MPI_Recv: Error message texts
> are
> > > not
> > > > available
> > > > 
> > > > 
> > > > 
> > > > 
> > > >
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> 


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