3.6. Include packages in build
In LAMMPS, a package is a group of files that enable a specific set of features. For example, force fields for molecular systems or rigid-body constraints are in packages. In the src directory, each package is a sub-directory with the package name in capital letters.
When building LAMMPS, you can choose to include or exclude each package. In general there is no need to include a package if you never plan to use its features.
If you get a run-time error that a LAMMPS command or style is “unknown”, it is often because the command is contained in a package, and your build did not include that package. If the command or style is available in a package included in the LAMMPS distribution, the error message will indicate which package would be needed. Running LAMMPS with the -h command-line switch will print all optional commands and packages that were enabled when building that executable.
For the majority of packages, if you follow the single step below to include it, you can then build LAMMPS exactly the same as you would without any packages installed. A few packages may require additional steps, as explained on the Build extras doc page.
These links take you to the extra instructions for those select packages:
The mechanism for including packages is simple but different for CMake versus make.
3.6.1. Information for both build systems
Almost all packages can be included or excluded in a LAMMPS build, independent of the other packages. However, some packages include files derived from files in other packages. LAMMPS checks for this and does the right thing. Individual files are only included if their dependencies are already included. Likewise, if a package is excluded, other files dependent on that package are also excluded.
By default no package is installed. Prior to August 2018, however,
if you downloaded a tarball, 3 packages (KSPACE, MANYBODY, MOLECULE)
were pre-installed via the traditional make procedure in the
directory. That is no longer the case, so that CMake will build
as-is without needing to un-install those packages.
CMake presets for installing many packages
Instead of specifying all the CMake options via the command-line, CMake allows initializing its settings cache using script files. These are regular CMake files which can manipulate and set CMake variables (which represent selected options), and can also contain control flow constructs for more complex operations.
LAMMPS includes several of these files to define configuration “presets”, similar to the options that exist for the Make based system. Using these files you can enable/disable portions of the available packages in LAMMPS. If you need a custom preset you can take one of them as a starting point and customize it to your needs.
cmake -C ../cmake/presets/minimal.cmake [OPTIONS] ../cmake # enable just a few core packages cmake -C ../cmake/presets/most.cmake [OPTIONS] ../cmake # enable most packages cmake -C ../cmake/presets/download.cmake [OPTIONS] ../cmake # enable packages which download sources or potential files cmake -C ../cmake/presets/nolib.cmake [OPTIONS] ../cmake # disable packages that do require extra libraries or tools cmake -C ../cmake/presets/clang.cmake [OPTIONS] ../cmake # change settings to use the Clang compilers by default cmake -C ../cmake/presets/intel.cmake [OPTIONS] ../cmake # change settings to use the Intel compilers by default cmake -C ../cmake/presets/all_on.cmake [OPTIONS] ../cmake # enable all packages cmake -C ../cmake/presets/all_off.cmake [OPTIONS] ../cmake # disable all packages mingw64-cmake -C ../cmake/presets/mingw-cross.cmake [OPTIONS] ../cmake # compile with MinGW cross compilers
Running cmake this way manipulates the CMake settings cache in your current build directory. You can combine multiple presets and options in a single cmake run, or change settings incrementally by running cmake with new flags.
# build LAMMPS with most commonly used packages, but then remove # those requiring additional library or tools, but still enable # GPU package and configure it for using CUDA. You can run. mkdir build cd build cmake -C ../cmake/presets/most.cmake -C ../cmake/presets/nolib.cmake -D PKG_GPU=on -D GPU_API=cuda ../cmake # to add another package, say BODY to the previous configuration you can run: cmake -D PKG_BODY=on . # to reset the package selection from above to the default of no packages # but leaving all other settings untouched. You can run: cmake -C ../cmake/presets/no_all.cmake .
3.6.2. Make shortcuts for installing many packages
The following commands are useful for managing package source files
and their installation when building LAMMPS via traditional make.
make in lammps/src to see a one-line summary.
These commands install/un-install sets of packages:
make yes-all # install all packages make no-all # uninstall all packages make yes-standard or make yes-std # install standard packages make no-standard or make no-std # uninstall standard packages make yes-user # install user packages make no-user # uninstall user packages make yes-lib # install packages that require extra libraries make no-lib # uninstall packages that require extra libraries make yes-ext # install packages that require external libraries make no-ext # uninstall packages that require external libraries
which install/un-install various sets of packages. Typing
package will list all the these commands.
Installing or un-installing a package for the make based build process works by simply copying files back and forth between the main source directory src and the sub-directories with the package name (e.g. src/KSPACE, src/USER-ATC), so that the files are included or excluded when LAMMPS is built. Only source files in the src folder will be compiled.
The following make commands help manage files that exist in both the src directory and in package sub-directories. You do not normally need to use these commands unless you are editing LAMMPS files or are installing a patch downloaded from the LAMMPS web site.
make package-status or
make ps to show which packages are
currently installed. For those that are installed, it will list any
files that are different in the src directory and package
make package-installed or
make pi to show which packages are
currently installed, without listing the status of packages that are
make package-update or
make pu to overwrite src files with
files from the package sub-directories if the package is installed.
It should be used after a patch has been applied,
since patches only update the files in the package sub-directory, but
not the src files.
make package-overwrite to overwrite files in the package
sub-directories with src files.
make package-diff to list all differences between pairs of
files in both the source directory and the package directory.