On Dec 14, 2006, at 1:48 PM, Michael Galloway wrote:
On Thu, Dec 14, 2006 at 02:01:54PM -0500, Michael Galloway wrote:
good day all, i've been trying to build ompi with the 6.2-X
version of the pgi
compiler set (pgcc 6.2-4 64-bit target on x86-64 Linux). i've
tried both 1.1.2 and
the current nightly build 1.1.3b2r12766, both fail with this error
from configure:
*** Fortran 77 compiler
checking whether we are using the GNU Fortran 77 compiler... no
checking whether /opt/pgi/linux86-64/6.2/bin/pgf77 accepts -g... yes
checking if Fortran 77 compiler works... yes
checking /opt/pgi/linux86-64/6.2/bin/pgf77 external symbol
convention... single underscore
checking if Fortran 77 compiler supports LOGICAL... yes
checking size of Fortran 77 LOGICAL... 4
checking for C type corresponding to LOGICAL... not found
configure: WARNING: *** Did not find corresponding C type
configure: error: Cannot continue
It appears that this is being caused by a problem much earlier in the
configure process. For some reason I don't totally understand, the
configure script is finding the size of shorts, ints, longs, long
longs, void *s, etc. to be 2. This is rather unexpected on a 64-bit
machine, obviously. In testing with PGI 6.1-3 on x86_64, it looks
like the IPA option is causing this to occur -- if I remove the IPA
option from the flags, configure runs properly.
In my (somewhat humble) opinion, turning on such aggressive options
is dangerous when compiling Open MPI (or most MPI implementations).
With share memory and RDMA interconnects, assumptions compiler
writers make when running at such high optimization setting are
frequently not true for codes like Open MPI. And the performance
gain in compiling the MPI layer with such high optimizations is
frequently near zero (that being said, there is a significant
advantage to adding some optimization flags and not including
debugging symbols in the MPI library if you don't need them).
It should be safe to compile Open MPI without the IPA options and
still use IPA when compiling your application.
Brian
--
Brian Barrett
Open MPI Team, CCS-1
Los Alamos National Laboratory
