The ZIP file linked below has been updated to reflect further progress made in getting WRFV22 to work on a Core Duo MacBook using Intel ifort and g95. As before, I am using mpich-1.2.5 for the MPI builds. My latest tests have employed ifort 10.0 and the most recent g95 at this writing. The g95 sections also are usable on PPC Macs.
For the most part, these configurations pass my "consistency tests", with some reservations. Consistency means that the MPI executables generate bitwise identical output, irrespective of the number of processors selected. However, if the domain is too finely subdivided, the results will start varying. I also encountered a test case in which identical results were generated for between 2-24 CPUs, inclusive, but results using only 1 CPU were different, which I cannot yet explain.
Results are not bitwise identical among compilers, or for the g95 versions when built on Intel and PPC architectures. However, I have not noted anything particularly amiss in the output. g95 executables from the PPC architecture can be executed on Intel (albeit slowly), and I've found this yields the same results obtained on PPC.
WRFV22_MacIntel_mods.zip (as of July 5, 2007).
Thursday, July 5, 2007
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