<div dir="ltr"><div>The second scounts in your code is suspicious.</div><div>According to <a href="http://www.mcs.anl.gov/research/projects/mpi/www/www3/MPI_Scatterv.html">http://www.mcs.anl.gov/research/projects/mpi/www/www3/MPI_Scatterv.html</a>, sendcnts and recvcnt are of different types.</div>
<div><br></div></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr">--Junchao Zhang</div></div>
<br><br><div class="gmail_quote">On Thu, Nov 28, 2013 at 2:29 PM, Danyang Su <span dir="ltr"><<a href="mailto:danyang.su@gmail.com" target="_blank">danyang.su@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Hi All,<br>
<br>
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:<br>
<br>
Fatal error in PMPI_Scatterv: Message truncated, error stack:<br>
PMPI_Scatterv(376)................:
MPI_Scatterv(sbuf=0000000000000000, scnts=0000000000E16CD0,
displs=0000000000E16CA0,<br>
MPI_INT, rbuf=0000000002BD0050, rcount=1, MPI_INT, root=0,
MPI_COMM_WORLD) failed<br>
MPIR_Scatterv_impl(187)...........:<br>
MPIR_Scatterv(144)................:<br>
MPIDI_CH3U_Receive_data_found(129): Message from rank 0 and tag 6
truncated; 16 bytes received but buffer size is 4<br>
<br>
The code is simple as follows:<br>
<br>
call MPI_SCATTERV(ja_in, <font color="#ff0000"><b>scounts</b></font>,
displs, MPI_INT, ja, <font color="#ff0000"><b>scounts</b></font>,
MPI_INT, 0, comm , ierr)<br>
<br>
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.<br>
<br>
Thanks and regards,<br>
<br>
Danyang
</div>
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