[mpich-discuss] Dataloop error message

[Palmer, Bruce J]

I can try but it will take a while. In the mean time, do you have any idea what  might be generating this type of error?

Bruce

-----Original Message-----
From: Halim Amer [mailto:aamer at anl.gov] 
Sent: Tuesday, March 07, 2017 11:35 AM
To: discuss at mpich.org
Subject: Re: [mpich-discuss] Dataloop error message

Can you attach a simple reproducible code?

Halim
www.mcs.anl.gov/~aamer

On 3/7/17 1:31 PM, Palmer, Bruce J wrote:
> Hi,
>
> I'm trying to track down a possible race condition in a test program that is using MPI RMA from MPICH 3.2. The program repeats a series of put/get/accumulate operations to different processors. When I'm running on 1 node 4 processors everything is fine but when I move to 2  nodes 4 processors I start getting failures. The error messages I'm seeing are
>
> Assertion failed in file src/mpid/common/datatype/dataloop/dataloop.c at line 265: 0
>
> and
>
> Assertion failed in file src/mpid/common/datatype/dataloop/dataloop.c at line 157: dataloop->loop_params.cm_t.dataloop
>
> Does anyone have a handle on what these routines do and what kind of behavior is generating these errors? The test program is allocating memory and using it to create a window, followed immediately by a call to MPI_Win_lock_all to create a passive synchronization epoch. I've been using request based RMA calls (Rput, Rget, Raccumulate) followed by an immediate call to MPI_Wait  for the individual RMA operations. Any suggestions about what these errors are telling me? If I start putting in print statements to narrow down the location of the error, the code runs to completion.
>
> Bruce Palmer
>
>
>
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