[Wrf-users] About compilation of wrf v2.2

[Brian Jewett]

Carl,

We encountered several issues compiling WRF/ARW v2.2, including long compile 
times, and for some routines out of memory messages (or simply "terminated") 
from the compiler.  Note solve_em.F is 30% larger than in version 2.1.2.  

Our problems were circumvented by one or more of the following, following 
suggestions from wrfhelp and others:

- going to the latest version of the compiler, if a newer release was 
available (e.g. intel fortran 9.1.044 instead of 9.0)

- for the out of memory error: compiling on a machine with more memory (I also 
switched from pgf90 to intel fortran)

Compiling several of the dyn_em/*.F routines proceeded slowly or died during 
the compile.  I retried the compile manually for the failed routines -- 
repeating the exact listed compile command with -O0; if that worked, I would 
try -O1 etc.  Some routines required -O0; others would compile at -O2 but not 
-O3.  You can then modify the configure.wrf (or arch/configure.defaults) 
following the example of some routines listed there such as module_domain.o, 
which are already set to compile with a lower optimization level.  For 
example, for ifort with -O2:

couple_or_uncouple_em.o \
nest_init_utils.o:
         $(RM) $@
         $(SED_FTN) $*.F > $*.b 
         $(CPP) -I../inc $(CPPFLAGS) $*.b  > $*.f90
         $(RM) $*.b 
         $(FC) -c $(PROMOTION) $(FCBASEOPTS) $(MODULE_DIRS) -g -O2 $*.f90

Hope this helps,

   Brian

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Brian F. Jewett, Ph.D
Research Scientist & Instructor, University of Illinois
Department of Atmospheric Sciences
Email:  bjewett at uiuc.edu
Ph:  (217) 333-3957 (W), 244-4393 (fax)
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