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Subject: Re: [OMPI users] memchecker overhead?
From: Samuel K. Gutierrez (samuel_at_[hidden])
Date: 2009-10-26 15:59:16

Hi Jed,

I'm not sure if this will help, but it's worth a try. Turn off OMPI's
memory wrapper and see what happens.

c-like shell
setenv OMPI_MCA_memory_ptmalloc2_disable 1

bash-like shell
export OMPI_MCA_memory_ptmalloc2_disable=1

Also add the following MCA parameter to you run command.

--mca mpi_leave_pinned 0

Samuel K. Gutierrez
Los Alamos National Laboratory
On Oct 26, 2009, at 1:41 PM, Jed Brown wrote:
> Jeff Squyres wrote:
>> Using --enable-debug adds in a whole pile of developer-level run-time
>> checking and whatnot.  You probably don't want that on production  
>> runs.
> I have found that --enable-debug --enable-memchecker actually produces
> more valgrind noise than leaving them off.  Are there options to make
> Open MPI strict about initializing and freeing memory?  At one point I
> tried to write policy files, but even with judicious globbing, I kept
> getting different warnings when run on a different program.  (All  
> these
> codes were squeaky-clean under MPICH2.)
> Jed
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