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| Back to [[ObtainingAndRunningFastDownward]]. = LP solver support = Some configurations of the search component of Fast Downward, such as optimal cost partitioning for landmark heuristics, require a linear programming (LP) solver and will complain if the planner has not been built with support for such a solver. Setting up LP support requires three steps, explained below: 1. Installing one or more LP solvers. 1. Installing the Open Solver Interface. 1. Building Fast Downward with LP support. == Step 1. Installing one or more LP solvers == Fast Downward uses a generic interface (see next step) for accessing LP solvers and hence can be used together with different LP solvers. Currently, four LP solvers are supported: CPLEX, SoPlex, Gurobi, and COIN-LP. You can install one, two or all solvers without causing conflicts. The solver used by the planner is selected by command-line arguments, not at compile time. We recommend using CPLEX or SoPlex, which in our experiments have led to better performance than COIN-LP. See [[http://issues.fast-downward.org/issue752|issue752]] for a discussion of their relative performance. We have no experience with Gurobi, but others recommend it over CPLEX. (If you have data comparing these two within Fast Downward, we would be very interested in hearing about it.) The following instructions are for Linux/macOS only. === Installing one or more LP solvers: CPLEX === IBM offers a [[http://ibm.com/academic|free academic license]] that includes access to CPLEX. Once you are registered, you find the software under Technology -> Data Science. Choose the right version and switch to HTTP download unless you have the IBM download manager installed. If you have problems using their website with Firefox, try Chrome instead. Execute the downloaded binary and follow the guided installation. If you want to install in a global location, you have to execute the installer as {{{root}}}. After the installation, set the following environment variable (adapt the path if you installed another version or did not install in the default location): {{{ export DOWNWARD_CPLEX_ROOT=/opt/ibm/ILOG/CPLEX_Studio129/cplex }}} Starting with version 12.7 CPLEX no longer supports 32-bit builds. If you need 32-bit builds with LP support, you need access to a CPLEX 12.6 installer. However, CPLEX 12.6 is not compatible with recent OSI versions. If you get segmentation faults with 32-bit CPLEX builds, try to build one of the sample programs that come with CPLEX to see if it is installed correctly. If you don't want to permanently modify your environment, you can also set these variables directly when calling CMake, or in {{{src/build.py}}}. The variables need to be set for when installing the Open Solver Interface (Step 2.) and when building Fast Downward's search component (Step 3.). ==== Installing CPLEX on Windows ==== Please install CPLEX into a directory without spaces. (We assume this is {{{C:\cplex}}}. Usually you will install ILOG Studio, which contains more than just CPLEX, so the paths below use {{{C:\cplex\cplex}}} to point to the CPLEX part of it.) /!\ '''Important Note:''' Setting up environment variables might require using / instead of the more Windows-common \ to work correctly. === Installing one or more LP solvers: SoPlex === SoPlex is available under a free academic license on the [[https://soplex.zib.de/download.php?fname=soplex-3.1.1.tgz|SoPlex homepage]]. Please use version 3.1.1 as OSI is currently not compatible with version 4+ of SoPlex. After downloading the sourcecode, you can install it as follows (adapt the path if you install another version or want to use another location): {{{ sudo apt install libgmp3-dev # The library is optional but important for SoPlex's performance export DOWNWARD_SOPLEX_ROOT=/opt/soplex-3.1.1 tar xvzf soplex-3.1.1.tgz cd soplex-3.1.1 mkdir build cd build cmake -DCMAKE_INSTALL_PREFIX="$DOWNWARD_SOPLEX_ROOT" .. make make install }}} After installation, permanently set the environment variable {{{DOWNWARD_SOPLEX_ROOT}}} to the value you used in installation. ==== Installing SoPlex on the grid in Basel ==== When installing SoPlex on the grid, the GMP library has to be loaded from a module. The following set of modules is compatible. {{{ module purge module load GCC/8.2.0-2.31.1 module load CMake/3.9.5-GCC-8.2.0-2.31.1 module load GMP/6.1.2-GCCcore-8.2.0.lua }}} Because the library is loaded from a module, it is not in a default directory, so change the CMake call to {{{ cmake -DCMAKE_INSTALL_PREFIX="$DOWNWARD_SOPLEX_ROOT" -DGMP_DIR="$EBROOTGMP" .. }}} === Installing one or more LP solvers: Gurobi === We have no experience with installing Gurobi. On Linux, Gurobi is only available for 64-bit. After the installation, set the following environment variables: {{{ export DOWNWARD_GUROBI_ROOT=/path/to/gurobi }}} If you don't want to permanently modify your environment, you can also set these variables directly when calling CMake, or in {{{src/build.py}}}. The variables need to be set for when installing the Open Solver Interface (Step 2.) and when building Fast Downward's search component (Step 3.). === Installing one or more LP solvers: COIN-LP === COIN-LP is no longer bundled with OSI starting from version 0.104.0 and needs to be installed separately. Installation should be possible with {{{ sudo apt-get install clp }}} but we have no experience with this. We recommend against using it in serious experiments unless you have established that it offers comparable performance to CPLEX in your setting. == Step 2. Installing the Open Solver Interface == The Open Solver Interface (OSI) provides a common interface to different LP solvers. OSI must be compiled '''after''' installing the LP solver(s) in Step 1. If you install a solver later, repeat the installation steps of OSI. We assume in the following that CPLEX and SoPlex are installed and the environment variables {{{DOWNWARD_CPLEX_ROOT}}} and {{{DOWNWARD_SOPLEX_ROOT}}} are set up correctly. These instructions apply to COIN/OSI 0.107.9, newer versions from http://www.coin-or.org/download/source/Osi/ should work, too. If you experience problems, please [[HomePage#contact|let us know]]. === Installing the Open Solver Interface on Linux === The way we install OSI depends on zlib, so make sure to install it first with {{{ sudo apt install zlib1g-dev }}} Run the following commands. If you have chosen not to install CPLEX or SoPlex, '''omit''' the options related to the corresponding solver from the call to {{{./configure}}} (options for solvers that are not installed can lead to very cryptic error messages). If you installed other solvers like CLP or Gurobi, also add the corresponding options for them. You may have to include the path to shared libraries in {{{LDFLAGS}}}, i.e. {{{LDFLAGS="-L$DOWNWARD_CPLEX_ROOT/lib -L/usr/lib/gcc/i686-linux-gnu/4.8"}}}. If there are other problems, see the [[#Troubleshooting|troubleshooting section]]. {{{#!highlight bash wget http://www.coin-or.org/download/source/Osi/Osi-0.107.9.tgz tar xvzf Osi-0.107.9.tgz cd Osi-0.107.9 export DOWNWARD_COIN_ROOT=/opt/coin/Osi-0.107.9 ./configure CC="gcc" CFLAGS="-pthread -Wno-long-long" \ CXX="g++" CXXFLAGS="-pthread -Wno-long-long" \ LDFLAGS="-L$DOWNWARD_CPLEX_ROOT/lib/x86-64_linux/static_pic \ -L$DOWNWARD_SOPLEX_ROOT/lib" \ --without-lapack --enable-static=no \ --prefix="$DOWNWARD_COIN_ROOT" \ --disable-bzlib \ --with-soplex-incdir=$DOWNWARD_SOPLEX_ROOT/include \ --with-soplex-lib="-lsoplex" \ --with-cplex-incdir=$DOWNWARD_CPLEX_ROOT/include/ilcplex \ --with-cplex-lib="-lcplex -lm -ldl" # -ldl is only needed for CPLEX >= 12.8 make make install cd .. rm -rf Osi-0.107.9 rm Osi-0.107.9.tgz }}} After installation, permanently set the environment variable {{{DOWNWARD_COIN_ROOT}}} to the value you used in installation. If you don't want to permanently modify your environment, you can also set these variables directly when calling CMake, or in {{{src/build.py}}}. The variables need to be set for when installing the Open Solver Interface (Step 2.) and when building Fast Downward's search component (Step 3.). === Installing the Open Solver Interface on macOS === Follow the Linux instructions above with the following change: * Building {{{CoinUtils}}} can create both static and dynamic libraries and there have been reported problems with both. * To use static libraries, replace {{{--enable-static=no}}} with {{{--enable-static=yes}}} and delete the dynamic libraries from {{{$(DOWNWARD_COIN_ROOT)/lib/}}} after building {{{CoinUtils}}}. * '''or''' * To use dynamic libraries, keep using {{{--enable-static=no}}} and change the Fast Downward CMakefile to look for dynamic (*.dylib) instead of static (*.a) libraries of libOsiCpx, libOsiGrb, and libOsiClp. Installation of version 0.103.0 has been reported to fail on macOS due to a bug in the {{{CoinUtils}}} configure script. (See [[http://issues.fast-downward.org/issue295|issue295]].) If you run into this problem, try downloading the [[attachment:coinutils-configure.patched|patched file]] attached to this page, make it executable, and replace the file {{{Osi-0.103.0/CoinUtils/configure}}} with it: {{{#! highlight bash cp Dowloads/coinutils-configure.patched Osi-0.103.0/CoinUtils/configure chmod +x Osi-0.103.0/CoinUtils/configure }}} === Installing the Open Solver Interface on Windows === We managed to install OSI with support for CPLEX on Windows using {{{msys2}}} using the following steps: 1. We assume CPLEX is installed in {{{C:\cplex}}}. 1. Install [[http://sourceforge.net/projects/msys2/|msys2]] (this is only necessary to compile OSI and not required to compile the planner) 1. Within msys2 use pacman to install base-devel: {{{pacman -S base-devel}}} 1. Download OSI (we use 0.103.0, newer versions should work but are untested) and unpack to {{{C:\msys64\home\<username>\Osi-0.103.0}}} 1. Start a command prompt and load the correct environment (see [[ObtainingAndRunningFastDownward#Compiling_on_Windows]] for how to do this), log in to msys from there, and change to the OSI directory: {{{#!highlight bash C:\msys64\usr\bin\bash --login -i cd Osi-0.103.0 }}} 1. Compile debug version of OSI: {{{#!highlight bash mkdir /c/osi mkdir /c/osi/mtd LD='link' STRIP=':' AR='lib' RANLIB=':' NM='dumpbin -symbols' \ CC='cl -nologo' CFLAGS=' -MTd -Zi -FS' CXX='cl -nologo' CXXFLAGS=' -MTd -Zi -EHsc -FS' \ ./configure --host=x86_64-w64-mingw32 \ --build=mingw32 \ --prefix=/c/osi/mtd \ --with-cplex-lib='-L/c/cplex/cplex/lib/x86_windows_vs2013/stat_mtd/cplex1262.lib' \ --with-cplex-incdir='/c/cplex/cplex/include/ilcplex' \ --disable-cplex-libcheck make make install }}} Afterwards, copy the debug symbol file {{{C:\msys64\home\<username>\Osi-0.103.0\vc120.pdb}}} to {{{C:\osi\mtd\lib\}}} to avoid compiler warnings when compiling a debug version. 1. Compile release version of OSI. Note the subtle differences to the command above: we use the directory {{{/c/osi/mt}}} instead of {{{/c/osi/mtd}}} in two places, the flag {{{-MT}}} instead of {{{-MTd}}} in two places, and the CPLEX library {{{stat_mta}}} instead of {{{stat_mtd}}}: {{{#!highlight bash mkdir /c/osi mkdir /c/osi/mt LD='link' STRIP=':' AR='lib' RANLIB=':' NM='dumpbin -symbols' \ CC='cl -nologo' CFLAGS=' -MT -Zi -FS' CXX='cl -nologo' CXXFLAGS=' -MT -Zi -EHsc -FS' \ ./configure --host=x86_64-w64-mingw32 \ --build=mingw32 \ --prefix=/c/osi/mt \ --with-cplex-lib='-L/c/cplex/cplex/lib/x86_windows_vs2013/stat_mta/cplex1262.lib' \ --with-cplex-incdir='/c/cplex/cplex/include/ilcplex' \ --disable-cplex-libcheck make make install }}} To compile a 64-bit version, setup the command prompt for 64-bit instead of x86 in step 5. Then choose the 64-bit version of CPLEX in steps 6. and 7. Everything else stays the same (in particular {{{--host=x86_64-w64-mingw32}}} and {{{--build=mingw32}}} do not change). Note that linking under Windows only works if the libraries were compiled with the same flags. For example, if OSI is compiled with the flag {{{-MTd}}} (dynamic debug) then the planner also has to use this flag for compilation. In our CMake build system some flags are automatically determined by the build type, e.g., if CMake is called with {{{CMAKE_BUILD_TYPE=DEBUG}}}, the flag {{{-MTd}}} is added by default. The CPLEX library also has to fit to everything. This is important when compiling Osi (in the --with-cplex-lib paramater, see above) and when compiling Fast Downward (handled by the CMake file). CPLEX has precompiled libraries for different versions of Visual Studio each as a static release and static debug version. This is documented in the file {{{C:/cplex/cplex/c_cpp.html}}}. Set the following environment variables so that Fast Downward finds the OSI installation: {{{#!highlight bash DOWNWARD_COIN_ROOT_RELEASE=C:/osi/mt DOWNWARD_COIN_ROOT_DEBUG=C:/osi/mtd }}} == Step 3. Building Fast Downward with LP support == Once OSI is installed, you can build Fast Downward's search component with LP support by calling {{{./build.py}}}. Remove your previous build first: {{{ rm -rf builds }}} Fast Downward automatically includes an LP Solver in the build, if it is needed, and the solver and the necessary OSI adapter are detected on the system. If you want to explicitly build without the LP solver that is installed on your system, disable the LP solver plugin (with {{{-DPLUGIN_LP_SOLVER_ENABLED=FALSE}}}) and all plug-ins that require it, such as {{{POTENTIAL_HEURISTICS}}} (see ObtainingAndRunningFastDownward#Manual_Builds ). == Troubleshooting == The LP-related libraries have a number of dependencies which might not be installed on your system. If for some reason one of the above steps fails, we would appreciate if you could attempt to troubleshoot it yourself. If the configure step of COIN/OSI fails with the error {{{Cannot find symbol(s) CPXgetstat with CPX}}}, check the path to the CPLEX lib directory. Depending on your CPLEX installation, the libraries might be stored in a different place, e.g., in {{{$DOWNWARD_CPLEX_ROOT/lib/x86-64_sles10_4.1/static_pic}}}. Check that the directory exists and contains the file {{{libcplex.a}}}. In some cases with the same error message, the library {{{dl}}} has to be added (see this [[https://stackoverflow.com/questions/42397481/issues-with-setup-of-coin-clp|question on stackoverflow]]). If the configure step fails for another reason, have a look at their [[https://projects.coin-or.org/BuildTools/wiki/user-troubleshooting|troubleshooting page]] or their page of [[https://projects.coin-or.org/BuildTools/wiki/current-issues|current issues]]. If you get warnings about unresolved references with CPLEX, visit their [[http://www-01.ibm.com/support/docview.wss?uid=swg21399926|help pages]]. If Fast Downward gives you compilation errors mentioning the `isnan` function, you are likely affected by an OSI/compiler incompatibility (see [[http://issues.fast-downward.org/issue681]]). In this case try the following: 1. Add `export DOWNWARD_USE_ISNAN_WORKAROUND=1` to your `~/.bashrc` file (or other shell configuration file). 1. Make sure the changed shell configuration takes effect by logging out and then logging in again. 1. In the main directory of the repository, delete all cmake build artifacts with `rm -r builds`. 1. Rebuild. If after troubleshooting you can get the LP package to work, please do let us know of your problem and its solution so that we can improve these instructions. If you still cannot get it to work, we may be able to provide some help, but note that the LP solvers and OSI library are external packages not developed by us. |