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Setting -O1 automatically sets the following options:
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The -O1 option may improve performance for applications with very large code size, many branches, and execution time not dominated by code within loops. If you are using a debugger (such as Totalview), compile with -g -O0.Įnables optimizations for speed and disables some optimizations that increase code size and affect speed. Math expressions will be evaluated in the same order in which they are written, which is necessary for debugging.
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Here is a quick reference table of optimization options (taken from the online Intel Fortran Compiler User and Reference Guides. In this section we present information about the various optimization options available in the Intel Fortran Compiler. Please see our Guide to GEOS-Chem performance for a summary of recent timing tests done with the Intel Fortran compiler. If you do not request the maximum amount of stack memory, then your GEOS-Chem simulation will not have enough memory to create temporary variables (including those created within OpenMP parallel loops).įor detailed instructions, please see Getting Started with GEOS-Chem: Specifying settings for OpenMP parallelization. In order to run GEOS-Chem with Intel Fortran, you must request the maximum amount of stack memory in your Unix environment. Requesting sufficient stack memory for GEOS-Chem Please see our Getting Started with GEOS-Chem: Configuring your computational environment for detailed instructions.
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If these variables are not automatically set by the module command on your system (or if your system does not use a module manager, then you will need to set these manually. $NETCDF_FORTRAN_HOME/lib or $NETCDF_FORTRAN_HOME/lib64) Path to the netCDF Fortran library folder (e.g. Path to the netCDF Fortran include folder (e.g. Your module manager *may* automatically define several environment variables for you: You can ask your IT staff what the corresponding commands would be on your particular cluster. # These commands load Intel Fortran 17 on the Harvard "Cannon" cluster For example, we use the following commands on the Harvard cluster (cannon.rc.): On many computer systems, a module manager such as Lmod or environment-modules can be used to load the Intel Fortran compiler library (and its dependencies) into your Unix environment. Using a module manager to load GNU Fortran and related libraries Here is some information about how you can customize your Unix environment to use the Intel Fortran compiler. In v11-01 we will test if this is resolved by the recent code updates.
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You can find more information about the Intel Fortran Compiler here:Īlso, normally when you installs the Intel Fortran compilers, you also will install the C and C++ compilers.
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If your institution does not have the resources to purchase the Intel Fortran Compiler, then we recommend that you use the GNU Fortran compiler-which is free and open source-instead.
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Intel Fortran requires the purchase of an expensive site license.
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