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Subject: Re: [OMPI users] Segfaults w/ both 1.4 and 1.5 on CentOS 6.2/SGE
From: Gutierrez, Samuel K (samuel_at_[hidden])
Date: 2012-03-13 15:53:48


The failure signature isn't exactly what we were seeing here at LANL, but there were misplaced memory barriers in Open MPI 1.4.3. Ticket 2619 talks about this issue (https://svn.open-mpi.org/trac/ompi/ticket/2619). This doesn't explain, however, the failures that you are experiencing within Open MPI 1.5.4. Can you give 1.4.4 a whirl and see if this fixes the issue? Any more information surrounding your failures in 1.5.4 are greatly appreciated.

Thanks,

--
Samuel K. Gutierrez
Los Alamos National Laboratory
On Mar 13, 2012, at 1:35 PM, Joshua Baker-LePain wrote:
On Tue, 13 Mar 2012 at 7:20pm, Gutierrez, Samuel K wrote
Just to be clear, what specific version of Open MPI produced the provided backtrace?  This smells like a missing memory barrier problem.
The backtrace in my original post was from 1.5.4 -- I took the 1.5.4 source and put it into the 1.5.3 SRPM provided by Red Hat.  Below is a backtrace from 1.4.3 as shipped by RH/CentOS:
#0  sm_fifo_read () at btl_sm.h:267
#1  mca_btl_sm_component_progress () at btl_sm_component.c:391
#2  0x0000003e54a129ca in opal_progress () at runtime/opal_progress.c:207
#3  0x00002b00fa6bb8d5 in barrier () at grpcomm_bad_module.c:270
#4  0x0000003e55e37d04 in ompi_mpi_init (argc=<value optimized out>,
   argv=<value optimized out>, requested=<value optimized out>,
   provided=<value optimized out>) at runtime/ompi_mpi_init.c:722
#5  0x0000003e55e5bae0 in PMPI_Init (argc=0x7fff8588b1cc, argv=0x7fff8588b1c0)
   at pinit.c:80
#6  0x0000000000400826 in main (argc=1, argv=0x7fff8588b2c8)
   at mpihello-long.c:11
Thanks!
--
Joshua Baker-LePain
QB3 Shared Cluster Sysadmin
UCSF
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