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Subject: Re: [OMPI users] Problem with OpenMPI (MX btl and mtl) and threads
From: François Trahay (francois.trahay_at_[hidden])
Date: 2009-06-11 06:00:22


Well, according to George Bosilca
(http://www.open-mpi.org/community/lists/users/2005/02/0005.php),
threads are supported in OpenMPI.
The program I try to run works with the TCP stack and MX driver is
thread-safe, so i guess the problem comes from the MX BTL or MTL.

Francois

Scott Atchley wrote:
> Hi Francois,
>
> I am not familiar with the internals of the OMPI code. Are you sure,
> however, that threads are fully supported yet? I was under the
> impression that thread support was still partial.
>
> Can anyone else comment?
>
> Scott
>
> On Jun 8, 2009, at 8:43 AM, François Trahay wrote:
>
>> Hi,
>> I'm encountering some issues when running a multithreaded program with
>> OpenMPI (trunk rev. 21380, configured with --enable-mpi-threads)
>> My program (included in the tar.bz2) uses several pthreads that perform
>> ping pongs concurrently (thread #1 uses tag #1, thread #2 uses tag
>> #2, etc.)
>> This program crashes over MX (either btl or mtl) with the following
>> backtrace:
>>
>> concurrent_ping_v2: pml_cm_recvreq.c:53:
>> mca_pml_cm_recv_request_completion: Assertion `0 ==
>> ((mca_pml_cm_thin_recv_request_t*)base_request)->req_base.req_pml_complete'
>>
>> failed.
>> [joe0:01709] *** Process received signal ***
>> [joe0:01709] *** Process received signal ***
>> [joe0:01709] Signal: Segmentation fault (11)
>> [joe0:01709] Signal code: Address not mapped (1)
>> [joe0:01709] Failing at address: 0x1238949c4
>> [joe0:01709] Signal: Aborted (6)
>> [joe0:01709] Signal code: (-6)
>> [joe0:01709] [ 0] /lib/libpthread.so.0 [0x7f57240be7b0]
>> [joe0:01709] [ 1] /lib/libc.so.6(gsignal+0x35) [0x7f5722cba065]
>> [joe0:01709] [ 2] /lib/libc.so.6(abort+0x183) [0x7f5722cbd153]
>> [joe0:01709] [ 3] /lib/libc.so.6(__assert_fail+0xe9) [0x7f5722cb3159]
>> [joe0:01709] [ 0] /lib/libpthread.so.0 [0x7f57240be7b0]
>> [joe0:01709] [ 1]
>> /home/ftrahay/sources/openmpi/trunk/install//lib/libopen-pal.so.0
>> [0x7f57238d0a08]
>> [joe0:01709] [ 2]
>> /home/ftrahay/sources/openmpi/trunk/install//lib/libopen-pal.so.0
>> [0x7f57238cf8cc]
>> [joe0:01709] [ 3]
>> /home/ftrahay/sources/openmpi/trunk/install//lib/libopen-pal.so.0(opal_free+0x4e)
>>
>> [0x7f57238bdc69]
>> [joe0:01709] [ 4]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_mtl_mx.so
>> [0x7f572060b72f]
>> [joe0:01709] [ 5]
>> /home/ftrahay/sources/openmpi/trunk/install//lib/libopen-pal.so.0(opal_progress+0xbc)
>>
>> [0x7f57238948e0]
>> [joe0:01709] [ 6]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_pml_cm.so
>> [0x7f572081145a]
>> [joe0:01709] [ 7]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_pml_cm.so
>> [0x7f57208113b7]
>> [joe0:01709] [ 8]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_pml_cm.so
>> [0x7f57208112e7]
>> [joe0:01709] [ 9]
>> /home/ftrahay/sources/openmpi/trunk/install//lib/libmpi.so.0(MPI_Recv+0x2bc)
>>
>> [0x7f5723e07690]
>> [joe0:01709] [10] ./concurrent_ping_v2(client+0x123) [0x401404]
>> [joe0:01709] [11] /lib/libpthread.so.0 [0x7f57240b6faa]
>> [joe0:01709] [12] /lib/libc.so.6(clone+0x6d) [0x7f5722d5629d]
>> [joe0:01709] *** End of error message ***
>> [joe0:01709] [ 4]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_pml_cm.so
>> [0x7f57208120bb]
>> [joe0:01709] [ 5]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_mtl_mx.so
>> [0x7f572060b80a]
>> [joe0:01709] [ 6]
>> /home/ftrahay/sources/openmpi/trunk/install//lib/libopen-pal.so.0(opal_progress+0xbc)
>>
>> [0x7f57238948e0]
>> [joe0:01709] [ 7]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_pml_cm.so
>> [0x7f572081147a]
>> [joe0:01709] [ 8]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_pml_cm.so
>> [0x7f57208113b7]
>> [joe0:01709] [ 9]
>> /home/ftrahay/sources/openmpi/trunk/install/lib/openmpi/mca_pml_cm.so
>> [0x7f57208112e7]
>> [joe0:01709] [10]
>> /home/ftrahay/sources/openmpi/trunk/install//lib/libmpi.so.0(MPI_Recv+0x2bc)
>>
>> [0x7f5723e07690]
>> [joe0:01709] [11] ./concurrent_ping_v2(client+0x123) [0x401404]
>> [joe0:01709] [12] /lib/libpthread.so.0 [0x7f57240b6faa]
>> [joe0:01709] [13] /lib/libc.so.6(clone+0x6d) [0x7f5722d5629d]
>> [joe0:01709] *** End of error message ***
>> --------------------------------------------------------------------------
>>
>> mpirun noticed that process rank 1 with PID 1709 on node joe0 exited on
>> signal 6 (Aborted).
>> --------------------------------------------------------------------------
>>
>>
>>
>> Any idea ?
>>
>> Francois Trahay
>>
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