On 09/06/11 16:23, Marcos Veríssimo Alves wrote: > Jesús, > > Thanks for sharing. A few questions: > > 1) What mpi are you using? How is it compiled?
I am using OpenMPI 1.4.3 from the 64-bit version of Debian testing. > 2) Do you have benchmarks to compare with previous versions of ifort > (10.x, 11.x) and perhaps other compilers in the same processors? I'm afraid I cannot provide any kind of systematic comparison with ifort 11: although I was able to compile SIESTA with it in the past, the resulting binary always turned out to be extremely unreliable, with frequent SEGFAULTs, and thus basically unusable. Luckily, those problems seem to have disappeared with ifort 12, at least in my case. I do have an equivalent version of SIESTA compiled with gfortran for the same system, using the same OpenMPI framework and the lineal algebra libraries included in Debian instead of their Intel/MKL equivalents. The ifort version is noticeably faster, although I tend to attribute the best part of this speedup to the libraries and not to the compiler. If you are interested in the quantitative results of a specific benchmark which can be run with both versions of SIESTA in a reasonable amount of time, I'll be happy to help. Best, Jesús
