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This repository contains an adaptive disk layout called the railway layout for optimizing disk block storage for interaction graphs. The key idea is to divide blocks into one or more sub-blocks, where each sub-block contains a subset of the attributes, but the entire graph structure is replicated within each sub-block. This improves query I/O, at the cost of increased storage overhead. We introduce optimal ILP formulations for partitioning disk blocks into sub-blocks with overlapping and non-overlapping attributes. Additionally, we present greedy heuristic approaches that can scale better compared to the ILP alternatives, yet achieve close to optimal query I/O. To demonstrate the benefits of the railway layout, we provide an extensive experimental study comparing our approach to a few baseline alternatives.

1. The partitioning algorithm depends on the Gurobi optimizer library. This is available for free under an academic license. Follow the instructions at: http://www.gurobi.com to install Gurobi.

2. First fetch and build boost using libc++

3. We expect this libc++ boost to be installed at '/opt/local/libcpp-software'
   
   

   mkdir tmp
   cd tmp
   http://sourceforge.net/projects/boost/files/boost/1.57.0/boost_1_57_0.tar.gz
   tar -zxvf boost_1_57_0.tar.gz
   cd boost_1_57_0
   ./bootstrap.sh --prefix=/opt/local/libcpp-software
   sudo ./b2 toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++" --layout=tagged  install
   cd ../../
   rm -fr tmp
   

4. Second, build the dependent libraries included in the 'ext' directory. These are the 'leveldb' and the 'libspatialindex' libraries

5. Enter into the external software dir
   
   

   
   cd ext/src
   

6. Build leveldb
   
   

   cd leveldb
   CC=clang CXX=clang++ CXXFLAGS="-std=c++11 -stdlib=libc++" make -j 4
   cd ..
   

7. Build libspatialindex
   
   

   cd libspatialindex
   CC=clang CXX=clang++  CXXFLAGS="-std=c++11 -stdlib=libc++" ./configure --prefix $(cd ../..; pwd)
   make -j 4
   make install
   cd ..
   

8. Build gtest
   
   

   cd gtest
   CC=clang CXX=clang++  CXXFLAGS="-std=c++11 -stdlib=libc++" ./configure --prefix $(cd ../..; pwd)
   make
   cp -fr include/gtest ../../include
   cp lib/.libs/libgtest* ../../lib/
   

9. Go back to the top level
   
   

   cd ../..
   

10. Third, build libintergdb
    
    

    cd libintergdb
    make -j 4
    cd ..
    

11. Last, run a test application
    
    

    cd test/SimpleTest
    make
    ./bin/SimpleTest