[mpich-discuss] Strange error

[Alejandro Allievi]

No I did not change the error handler for MPI_COMM_WORLD. How could I do
that??

Also, what do you mean by "performing multiple completions in the same
call"??

(sorry for all the silly question)

On Tue, Oct 9, 2012 at 4:25 PM, Dave Goodell <goodell at mcs.anl.gov> wrote:

> IIRC, the MPI_ERROR field of the status structure is not used when
> performing an MPI_Recv.  It is only used when performing multiple
> completions in the same call, such as with MPI_Waitall/Testsome/etc.
>
> Did you change the error handler for MPI_COMM_WORLD?  If not, then it
> defaults to MPI_ERRORS_ARE_FATAL, which will cause the MPI job to abort if
> an error is encountered.  If you change it to MPI_ERRORS_RETURN then you
> need to capture the return value from MPI_Recv.  For example:
>
> ----8<----
> int mpi_errno;
> …
> mpi_errno = MPI_Recv(greeting,…);
> if (mpi_errno != MPI_SUCCESS) {
>     /* inspect mpi_errno here */
> }
> ----8<----
>
> -Dave
>
> On Oct 9, 2012, at 1:36 PM CDT, Alejandro Allievi wrote:
>
> > Thanks for the reply.
> >
> > Here goes a code snippet containing the part that generates the error
> >
> >               MPI_Recv(greeting, MAX_STRING, MPI_CHAR, MPI_ANY_SOURCE,
> MPI_ANY_TAG , MPI_COMM_WORLD, &status);
> >
> > //These are fine
> >               printf("\nSource of this message is process: %d\n",
> status.MPI_SOURCE);
> >               printf("Tag of this message is: %d\n", status.MPI_TAG);
> >
> > //This is the problem. Not quite sure if correct though.
> >               MPI_Error_string( status.MPI_ERROR , mystring , &len );
> >               printf("Tag of this message is: %d %s\n", status.MPI_ERROR
> , mystring );
> >
> > //These are fine too
> >               MPI_Get_count(&status , MPI_CHAR , &count);
> >               printf("Size of this message is: %d MPI_CHAR", count);
> >
> > Alejandro
> >
> >
> > On Tue, Oct 9, 2012 at 3:38 PM, Dave Goodell <goodell at mcs.anl.gov>
> wrote:
> > Can you post some example code showing how you are calling MPI_Recv and
> how you are processing the error code/class/message?  It's easy to get
> confused by the error handling conventions of the MPI standard, and this
> sounds like either user error or memory corruption, depending on what code
> you post.
> >
> > -Dave
> >
> > On Oct 9, 2012, at 11:55 AM CDT, Alejandro Allievi wrote:
> >
> > > Hi,
> > >
> > > I'm getting the following error: "No MPI error, error stack:
> (unknown)(): No MPI error"
> > > returned by "status.MPI_ERROR" in "status" variable  in MPI_Recv.
> However, there seems
> > > to be no error. Does anybody know why the "error stack: (unknown)():
> No MPI error"
> > >
> > > Thanks for any help.
> > >
> > > Alejandro
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> >
> > --
> > Alejandro Allievi
> > http://www.ace-net.ca/wiki/Alejandro_Allievi
> >
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> >
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