Hi Michel, Jeff, Rainer, list
I have AMD Opteron Shanghai, and Intel 10.1017.
I had trouble with the Intel -fast flag also.
According to the ifort man page/help:
-fast = -xT -O3 -ipo -no-prec-div -static
(Each compiler vendor has a different -fast, PGI is another thing.)
Intel doesn't allow SSE-type optimization beyond W (SSE+SSE2)
for AMD processors (an old and contentious issue,
Google it form more info).
So, I changed -xT to -xW (the highest level allowed,
also recommended by AMD).
I had trouble with ipo before (missing symbols during link),
so I reduced it to ip.
Moreover, -static definitely cannot work with the Infiniband
and other tons of shared libraries, of course,
hence I simply removed it.
However, as suggested by Rainer,
-static-intel may be OK,
if all you want is to avoid sending the Intel LD_LIBRARY_PATH with your
mpiexec command.
(I haven't tried it, though.)
The flags became: -xW -O3 -ip -no-prec-div
I used the same flags for ifort (FFLAGS, FCFLAGS), icc (CFLAGS)
and icpc (CXXFLAGS),to build OpenMPI 1.3.2, and it works.
For "Genuine Intel" processors you can upgrade -xW to whatever is
appropriate.
My $0.02.
Gus Correa
---------------------------------------------------------------------
Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
---------------------------------------------------------------------
Jeff Squyres wrote:
Rainer and I are still iterating on the trunk solution (we moved to an
hg branch just for convenience for the moment).
Note that the Fortran flags aren't too important to OMPI. We *only* use
them in configure. OMPI doesn't contain any Fortran 77 code at all, and
the F90 module is extremely minimalistic (generally one-line subroutines
to call the C counterpart). So a workaround for the moment -- until we
can figure out the problem -- might be to remove the -fast from the
FFLAGS and FCFLAGS.
On Jun 3, 2009, at 11:34 AM, Rainer Keller wrote:
Dear Michel,
per the naming convention test in configure:
ifort -fast
will turn on -xHOST -O3 -ipo -no-prec-div -static,
of which -ipo turns on interprocedural optimizations for multiple files.
Here the compiled object file does not contain the symbols searched
for in the
configure-tests.
Looking into the simple test-case in configure and the options that
one has to
figure out the naming convention using compilation (-c), I don't see
an other
other than disabling -fast & -ipo for intel-fortan compilers.
Please check trunk in commit r21363.
On Wednesday 03 June 2009 09:29:09 am DEVEL Michel wrote:
> In fact I forgot to put back to '-fast -C' the FCFLAGS variable (from
> '-O3 -C'). There is still an error (many opal_*_* subroutines not found
> during the ipo step) at the same place, coming from the fact that
> "ld: attempted static link of dynamic object
> `../../../opal/.libs/libopen-pal.so'
> although I put --enable-static in the configure step...
> Any idea of how to make the static libraries ?
In order to statically link at least the intel-libraries, please add
-static-intel (in previous intel compilers called -i-static)
to LDFLAGS
With best regards,
Rainer
--
------------------------------------------------------------------------
Rainer Keller, PhD Tel: +1 (865) 241-6293
Oak Ridge National Lab Fax: +1 (865) 241-4811
PO Box 2008 MS 6164 Email: kel...@ornl.gov
Oak Ridge, TN 37831-2008 AIM/Skype: rusraink
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