2016-10-19 03:05:30 +08:00
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The Makefile.lammps file in this directory is used when building
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LAMMPS with packages that make use of the NetCDF library or its
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2017-05-05 01:22:20 +08:00
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parallel version. For example, the USER-NETCDF package which adds
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dump netcdf and dump netcdf/mpiio commands.
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The file has several settings needed to compile
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2016-10-19 03:05:30 +08:00
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and link LAMMPS with the NetCDF and parallel NetCDF support.
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For any regular NetCDF installation, all required flags should be
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autodetected. Please note that parallel NetCDF support is
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beneficial only when you run on a machine with very many processors
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like an IBM BlueGene or Cray. For most people regular NetCDF
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support should be sufficient and not cause any performance
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penalties.
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If you have problems compiling or linking, you may have to set
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the flags manually. There are three makefile variables
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1) netcdf_SYSINC
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This is for setting preprocessor options and include file paths.
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Set -DLMP_HAS_NETCDF, if you have NetCDF installed.
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Set -DLMP_HAS_PNETCDF, if you have parallel NetCDF installed.
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You can have either or both defines set. If none of these are
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set, LAMMPS will compile, but the NetCDF enabled functionality
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will not be available.
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In addition you may have to point to the folder with the include
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with -I/path/to/netcdf/include
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Example for a Fedora 24 machine with serial NetCDF installed as
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netcdf-devel-4.4.0-3.fc24.x86_64 RPM package:
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netcdf_SYSINC = -DLMP_HAS_NETCDF -I/usr/include -I/usr/include/hdf
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2) netcdf_SYSLIB
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This is the setting for all required libraries that need to be linked to.
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Example for a Fedora 24 machine with serial NetCDF installed as
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netcdf-devel-4.4.0-3.fc24.x86_64 RPM package:
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netcdf_SYSLIB = -lnetcdf
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3) netcdf_SYSPATH
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This is the setting for the path of directories with the NetCDF libraries.
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Typically, this will be of the form -L/path/to/netcdf/lib
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In the example from above, it can be left empty, because the Linux
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distribution provided libraries are installed in a system library location.
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