[mpich-discuss] RMA calls with MPI Datatypes using structs

[Min Si]

Hi Bruce,

Thanks for this report and your test code. I believe this is a bug. We 
will fix it.

You can track the status from this ticket.
https://trac.mpich.org/projects/mpich/ticket/2335

Min
On 5/25/16 11:20 AM, Palmer, Bruce J wrote:
> 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 [mailto:robl at mcs.anl.gov]
> Sent: Wednesday, May 25, 2016 9:07 AM
> To: discuss at mpich.org
> Subject: Re: [mpich-discuss] RMA calls with MPI Datatypes using structs
>
>
>
> On 05/25/2016 10:40 AM, Palmer, Bruce J wrote:
>> 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?
> 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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