[mpich-discuss] problem with MPI_SCATTERV

[Danyang Su]

Hi Junchao,

Thanks for pointing out this. It works after I changed the recvcnt value 
to the maximum number of elements in receive buffer (integer).

Danyang

On 28/11/2013 3:13 PM, Junchao Zhang wrote:
> The second scounts in your code is suspicious.
> According to 
> http://www.mcs.anl.gov/research/projects/mpi/www/www3/MPI_Scatterv.html, 
>  sendcnts and recvcnt are of different types.
>
>
> --Junchao Zhang
>
>
> On Thu, Nov 28, 2013 at 2:29 PM, Danyang Su <danyang.su at gmail.com 
> <mailto:danyang.su at gmail.com>> wrote:
>
>     Hi All,
>
>     I ran into a problem with MPI_SCATTERV. When the sendcounts
>     (scounts in code) is the same for every process, it works fine,
>     but if the sendcounts is different (e.g., 1, 2, 3, 4 for 4
>     processes, respectively),  there will be error as follows:
>
>     Fatal error in PMPI_Scatterv: Message truncated, error stack:
>     PMPI_Scatterv(376)................:
>     MPI_Scatterv(sbuf=0000000000000000, scnts=0000000000E16CD0,
>     displs=0000000000E16CA0,
>      MPI_INT, rbuf=0000000002BD0050, rcount=1, MPI_INT, root=0,
>     MPI_COMM_WORLD) failed
>     MPIR_Scatterv_impl(187)...........:
>     MPIR_Scatterv(144)................:
>     MPIDI_CH3U_Receive_data_found(129): Message from rank 0 and tag 6
>     truncated; 16 bytes received but buffer size is 4
>
>     The code is simple as follows:
>
>     call MPI_SCATTERV(ja_in, *scounts*, displs, MPI_INT, ja,
>     *scounts*, MPI_INT, 0, comm , ierr)
>
>     ja_in is allocated for process #0 and ja is allocated for every
>     process. The size of ja_in and ja is big enough to hold large dataset.
>
>     Thanks and regards,
>
>     Danyang
>
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