[OMPI devel] Fwd: [OMPI users] Onesided + derived datatypes

[Brian Barrett]

Hi all -






Brian

Begin forwarded message:

I looked into this, and it appears to be datatype related. If the displacements are set t o 3, 2, 1, 0, there the datatype will fail the type checks for one-sided because is_overlapped() returns 1 for the datatype. My reading of the standard seems to indicate this should not be. I haven't looked into the problems with displacement set to 0, 1, 2, 3, but I'm guessing it has something to do with the reverse problem. This looks like a datatype issue, so it's out of my realm of expertise. Can someone else take a look?

From: doriankrause <doriankra...@web.de>
Date: December 10, 2008 4:07:55 PM MST
To: us...@open-mpi.org
Subject: [OMPI users] Onesided + derived datatypes
Reply-To: Open MPI Users <us...@open-mpi.org>

Hi List,

I have a MPI program which uses one sided communication with derived
datatypes (MPI_Type_create_indexed_block). I developed the code with
MPICH2 and unfortunately didn't thought about trying it out with
OpenMPI. Now that I'm "porting" the Application to OpenMPI I'm facing
some problems. On the most machines I get an SIGSEGV in MPI_Win_fence,
sometimes an invalid datatype shows up. I ran the program in Valgrind
and didn't get anything valuable. Since I can't see a reason for this
problem (at least if I understand the standard correctly), I wrote the
attached testprogram.

Here are my experiences:


give the same results

assuming that V1+O2 and V2 should be equivalent?)
* ONESIDED + V1 + O1:
[m02:03115] *** An error occurred in MPI_Put
[m02:03115] *** on win
[m02:03115] *** MPI_ERR_TYPE: invalid datatype
[m02:03115] *** MPI_ERRORS_ARE_FATAL (goodbye)


is correct it means that OpenMPI is buggy when it comes to onesided
communication and (some) derived datatypes, so that it is probably not
of problem in my code.


can be be seen with gcc-3.3.1 and intel 10.1.

Please correct me if ompitest.cc contains errors. Otherwise I would be
glad to hear how I should report these problems to the develepors (if
they don't read this).

Thanks + best regards

Dorian

* If I compile without ONESIDED defined, everything works and V1 and V2 * If I compile with ONESIDED and V2 defined (MPI_Type_contiguous) it works. * ONESIDED + V1 + O2: No errors but obviously nothing is send? (Am I in I didn't get a segfault as in the "real life example" but if ompitest.cc I'm using OpenMPI-1.2.8 with the newest gcc 4.3.2 but the same behaviour

ompitest.tar.gz
Description: GNU Zip compressed data

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