Open MPI logo

Open MPI Development Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Development mailing list

Subject: Re: [OMPI devel] MPI_Cart_coords_f segv with Intel compiler
From: Larry Baker (baker_at_[hidden])
Date: 2012-05-24 14:06:05


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]
>
>
>
> _______________________________________________
> devel mailing list
> devel_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/devel