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<div class="moz-cite-prefix">Hi Junchao,<br>
<br>
Thanks for pointing out this. It works after I changed the recvcnt
value to the maximum number of elements in receive buffer
(integer).<br>
<br>
Danyang<br>
<br>
On 28/11/2013 3:13 PM, Junchao Zhang wrote:<br>
</div>
<blockquote
cite="mid:CA+MQGp8Oysvesy=GG+ZkCP6uV-cPrdN4o+zimd0ZaDspLCBwzA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>The second scounts in your code is suspicious.</div>
<div>According to <a moz-do-not-send="true"
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 moz-do-not-send="true"
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>
<br>
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