[mpich-discuss] MPI-IO error codes

[William Gropp]

You are confusing error codes with error classes.  MPI routines return an error code; the MPI_ERR_xxx values are errors classes and can be obtained from an error code with the routine MPI_Error_class .  In MPICH2, the error code encodes additional data about the failure; the value from MPI_Error_string provides a more detained error text.  

Bill

William Gropp
Director, Parallel Computing Institute
Deputy Director for Research
Institute for Advanced Computing Applications and Technologies
Paul and Cynthia Saylor Professor of Computer Science
University of Illinois Urbana-Champaign



On May 11, 2012, at 12:00 AM, Wei-keng Liao wrote:

> When opening an non-existing file for read-write, MPI_File_open is expected
> to return the error code MPI_ERR_NO_SUCH_FILE, which is defined as 37 in mpi.h.
> 
> But I am getting a strange number, 604547877.
> Here is the code I tried. (using mpich2-1.4.1p1)
> 
>    err = MPI_File_open(MPI_COMM_WORLD, "testfile", MPI_MODE_RDWR,
>                        MPI_INFO_NULL, &fh);
>    printf("err=%d MPI_ERR_NO_SUCH_FILE=%d\n",err,MPI_ERR_NO_SUCH_FILE);
> 
> stdout:
> err=604547877 MPI_ERR_NO_SUCH_FILE=37
> 
> I found similar problems for other error codes.
> 
> Wei-keng
> 
> 
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