[mpich-discuss] problem with MPI_SCATTERV
danyang.su at gmail.com
Thu Nov 28 14:29:22 CST 2013
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:
MPI_INT, rbuf=0000000002BD0050, rcount=1, MPI_INT, root=0,
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,
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