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Subject: Re: [OMPI devel] [patch] MPI_Comm_Spawn(), parent name is empty
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-01-20 10:34:04


Fascinating - thanks for spotting it! That code hasn't changed in a very long time, so I guess nobody has been looking at the name!

:-)

Fixed in the trunk - will add it to the 1.4.2 list.

On Jan 20, 2010, at 7:54 AM, Guillaume Thouvenin wrote:

> Hello,
>
> When calling MPI_Comm_get_name() on the predefined communicator
> MPI_COMM_PARENT after a call to MPI_Comm_spawn(), we are expecting the
> name MPI_COMM_PARENT as stated into the MPI Standard 2.2.
>
> In practice, MPI_Comm_get_name() returns an empty string. As far as I
> understand the problem, it seems that there is a bug into dyn_init().
> The name is set but the flags is not updated. The following patch fixes
> the problem.
>
> Guillaume
> ---
>
> diff --git a/ompi/mca/dpm/orte/dpm_orte.c b/ompi/mca/dpm/orte/dpm_orte.c
> --- a/ompi/mca/dpm/orte/dpm_orte.c
> +++ b/ompi/mca/dpm/orte/dpm_orte.c
> @@ -965,6 +965,7 @@ static int dyn_init(void)
>
> /* Set name for debugging purposes */
> snprintf(newcomm->c_name, MPI_MAX_OBJECT_NAME, "MPI_COMM_PARENT");
> + newcomm->c_flags |= OMPI_COMM_NAMEISSET;
>
> return OMPI_SUCCESS;
> }
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