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Subject: Re: [OMPI devel] MPI_Cart_coords_f segv with Intel compiler
From: Larry Baker (baker_at_[hidden])
Date: 2012-05-24 16:23:18


Dang! You're absolutely right! Mea culpa.

Thanks,

Larry Baker
US Geological Survey
650-329-5608
baker_at_[hidden]

On 24 May 2012, at 1:19 PM, Jeff Squyres wrote:

> FWIW, I think we imported your patch a while ago. Here it is on the trunk:
>
> https://svn.open-mpi.org/trac/ompi/browser/trunk/opal/mca/memory/linux/malloc.c#L3933
>
> And here it is on v1.6:
>
> https://svn.open-mpi.org/trac/ompi/browser/branches/v1.6/opal/mca/memory/linux/malloc.c#L3933
>
>
>
> On May 24, 2012, at 2:06 PM, Larry Baker wrote:
>
>> Terry,
>>
>> What you are seeing is a bug in the vectorizer in the Intel 2011.6.233 release. We've talked about this before. You should probably remove that compiler from your system(s). I think the new release of OpenMPI describes this problem, but does not stop if from occurring. I write a patch for ptmalloc2/malloc.c for OpenMPI 1.4.3 which automatically adjusts the optimization level for _int_malloc(), which is where the bug occurs.
>>
>> Larry Baker
>> US Geological Survey
>> 650-329-5608
>> baker_at_[hidden]
>>
>> ---------- Start of Patch ----------
>> --- opal/mca/memory/ptmalloc2/malloc.c.original 2010-04-13 10:30:26.000000000 -0700
>> +++ opal/mca/memory/ptmalloc2/malloc.c 2011-11-04 15:01:37.000000000 -0700
>> @@ -2,6 +2,17 @@
>> /* Copyright (c) 2010 Cisco Systems, Inc. All rights reserved.
>> */
>>
>> +/* With Intel Composer XE V12.1.0, release 2011.6.233, any launch */
>> +/* fails, even before main(), due to a bug in the vectorizer (see */
>> +/* https://svn.open-mpi.org/trac/ompi/changeset/25290). The fix is */
>> +/* to disable vectorization by reducing the optimization level to */
>> +/* -O1 for _int_malloc(). The only reliable method to identify */
>> +/* release 2011.6.233 is the predefined __INTEL_COMPILER_BUILD_DATE */
>> +/* macro, which will have the value 20110811 (Linux, Windows, and */
>> +/* Mac OS X). (The predefined __INTEL_COMPILER macro is nonsense, */
>> +/* 9999, and both the 2011.6.233 and 2011.7.256 releases identify */
>> +/* themselves as V12.1.0 from the -v command line option.) */
>> +
>> #define OPAL_DISABLE_ENABLE_MEM_DEBUG 1
>> #include "opal_config.h"
>>
>> @@ -3945,6 +3956,12 @@
>> ------------------------------ malloc ------------------------------
>> */
>>
>> +#ifdef __INTEL_COMPILER_BUILD_DATE
>> +#if __INTEL_COMPILER_BUILD_DATE == 20110811
>> +#pragma GCC optimization_level 1
>> +#endif
>> +#endif
>> +
>> Void_t*
>> _int_malloc(mstate av, size_t bytes)
>> {
>> ---------- End of Patch ----------
>>
>> On 24 May 2012, at 6:54 AM, TERRY DONTJE wrote:
>>
>>> I am seeing several Cart Fortran tests (like MPI_Cart_coords_f) segv in opal_memory_ptmalloc2_int_free when OMPI trunk is compiled with icc 12.1.0 for 64 bit on linux. Just wondering if anyone has seen anything similar to this with a different version of icc. Other non-Intel compilers seem to not exhibit this issue.
>>>
>>> --
>>> Terry D. Dontje | Principal Software Engineer
>>> Developer Tools Engineering | +1.781.442.2631
>>> Oracle - Performance Technologies
>>> 95 Network Drive, Burlington, MA 01803
>>> Email terry.dontje_at_[hidden]
>>>
>>>
>>>
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>>
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>
>
> --
> Jeff Squyres
> jsquyres_at_[hidden]
> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
>
>
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