On Thu, Dec 14, 2006 at 03:28:25PM -0700, Brian W. Barrett wrote: > > 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, indeed that seems to have been the issue. thanks for the help! -- michael
