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<p>Hi Bruce,</p>
Thanks for this report and your test code. I believe this is a bug.
We will fix it.<br>
<br>
You can track the status from this ticket.<br>
<a class="moz-txt-link-freetext" href="https://trac.mpich.org/projects/mpich/ticket/2335">https://trac.mpich.org/projects/mpich/ticket/2335</a><br>
<br>
Min<br>
<div class="moz-cite-prefix">On 5/25/16 11:20 AM, Palmer, Bruce J
wrote:<br>
</div>
<blockquote cite="mid:61BD36C35043184BB5E9C6E07E2C74AB1A637E54@EX10MBOX02.pnnl.gov" type="cite">
<pre wrap="">Attached is my test code. I've been trying to emulate the gather-scatter semantics in Global Arrays using MPI RMA calls. The top of the file has a bunch of parameters that can be used to configure different protocols for implementing GA-style puts and gets. The failure I'm seeing seems to be independent of the choice of protocol. The parameter USE_STRUCTS can be used to switch between structs and subarrays. Let me know if you have more questions.
Bruce
-----Original Message-----
From: Rob Latham [<a class="moz-txt-link-freetext" href="mailto:robl@mcs.anl.gov">mailto:robl@mcs.anl.gov</a>]
Sent: Wednesday, May 25, 2016 9:07 AM
To: <a class="moz-txt-link-abbreviated" href="mailto:discuss@mpich.org">discuss@mpich.org</a>
Subject: Re: [mpich-discuss] RMA calls with MPI Datatypes using structs
On 05/25/2016 10:40 AM, Palmer, Bruce J wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hi,
I've been trying to implement code using MPI_Get and MPI_Put that move
around data using MPI_Datatypes. If I create the data type using
MPI_Type_create_subarray, everything works fine. If I create the data
type using MPI_Type_create_struct then I get a failure if the amount
of data I'm moving around becomes large. At the moment the crossover
point is moving a total of a million doubles on 8 cores (125000
doubles per core), which doesn't seem to be excessively large. The
error I'm seeing on a Linux cluster using and Infiniband interconnect
is
Assertion failed in file
./src/mpid/ch3/channels/nemesis/include/mpid_nem_inline.h at line 406
: MPID_NEM_MPICH_DATA_LEN - buf_offset >= ext_hdr_sz
internal ABORT - process 1
Note that the same code runs fine if the data type is created using
the subarray call. It looks like some internal limit is being
exceeded, but if so, I think the threshold may be set a bit on the low
side. Does anyone know more about this?
</pre>
</blockquote>
<pre wrap="">
Doesn't look like something we've seen before. Can you send us the
working subarray and non-working struct datatype?
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