cereal/performance.cpp

#include <sstream>
#include <iostream>
#include <chrono>
#include <random>

#include <boost/format.hpp>

#include <boost/serialization/serialization.hpp>
#include <boost/archive/binary_oarchive.hpp>
#include <boost/archive/binary_iarchive.hpp>
#include <boost/serialization/vector.hpp>

#include <cereal/binary_archive/binary_archive.hpp>
#include <cereal/binary_archive/vector.hpp>

//! Runs serialization to save data to an ostringstream
/*! Used to time how long it takes to save data to an ostringstream.
    Everything that happens within the save function will be timed, including
    any set-up necessary to perform the serialization.

    @param data The data to save
    @param saveFunction A function taking in an ostringstream and the data and returning void
    @return The ostringstream and the time it took to save the data */
template <class T>
std::chrono::milliseconds
saveData( T const & data, std::function<void(std::ostringstream &, T const&)> saveFunction, std::ostringstream & os )
{
  auto start = std::chrono::high_resolution_clock::now();
  saveFunction( os, data );
  return std::chrono::duration_cast<std::chrono::milliseconds>( std::chrono::high_resolution_clock::now() - start );
}

//! Runs serialization to load data to from an istringstream
/*! Used to time how long it takes to load data from an istringstream.
    Everything that happens within the load function will be timed, including
    any set-up necessary to perform the serialization.

    @param dataStream The saved data stream
    @param loadFunction A function taking in an istringstream and a data reference and returning void
    @return The loaded data and the time it took to save the data */
template <class T>
std::pair<T, std::chrono::milliseconds>
loadData( std::ostringstream const & dataStream, std::function<void(std::istringstream &, T &)> loadFunction )
{
  T data;
  std::istringstream os( dataStream.str() );

  auto start = std::chrono::high_resolution_clock::now();
  loadFunction( os, data );

  return {data, std::chrono::duration_cast<std::chrono::milliseconds>( std::chrono::high_resolution_clock::now() - start )};
}

struct cerealBinary
{
  //! Saves data to a cereal binary archive
  template <class T>
  static void save( std::ostringstream & os, T const & data )
  {
    cereal::BinaryOutputArchive oar(os);
    oar & data;
  }

  //! Loads data to a cereal binary archive
  template <class T>
  static void load( std::istringstream & is, T & data )
  {
    cereal::BinaryInputArchive iar(is);
    iar & data;
  }
};

struct boostBinary
{
  //! Saves data to a boost binary archive
  template <class T>
  static void save( std::ostringstream & os, T const & data )
  {
    boost::archive::binary_oarchive oar(os);
    oar & data;
  }

  //! Loads data to a boost binary archive
  template <class T>
  static void load( std::istringstream & is, T & data )
  {
    boost::archive::binary_iarchive iar(is);
    iar & data;
  }
};

struct binary
{
  typedef boostBinary  boost;
  typedef cerealBinary cereal;
};

//! Times how long it takes to serialize (load and store) some data
/*! Times how long and the size of the serialization object used to serialize
    some data.  Result is output to standard out.

    @tparam SerializationT The serialization struct that has all save and load functions
    @tparam DataT The type of data to test
    @param name The name for this test
    @param data The data to serialize
    @param numAverages The number of times to average
    @param validateData Whether data should be validated (input == output) */
template <class SerializationT, class DataT>
void test( std::string const & name,
            DataT const & data,
            size_t numAverages = 10,
            bool validateData = false )
{
  std::cout << "-----------------------------------" << std::endl;
  std::cout << "Running test: " << name << std::endl;

  std::chrono::milliseconds totalBoostSave{0};
  std::chrono::milliseconds totalBoostLoad{0};

  std::chrono::milliseconds totalCerealSave{0};
  std::chrono::milliseconds totalCerealLoad{0};

  size_t boostSize = 0;
  size_t cerealSize = 0;

  for(size_t i = 0; i < numAverages; ++i)
  {
    // Boost
    {
      std::ostringstream os;
      auto saveResult = saveData<DataT>( data, {SerializationT::boost::template save<DataT>}, os );
      totalBoostSave += saveResult;
      if(!boostSize)
        boostSize = os.tellp();

      auto loadResult = loadData<DataT>( os, {SerializationT::boost::template load<DataT>} );
      totalBoostLoad += loadResult.second;

      if( validateData )
        ; // TODO
    }

    // Cereal
    {
      std::ostringstream os;
      auto saveResult = saveData<DataT>( data, {SerializationT::cereal::template save<DataT>}, os );
      totalCerealSave += saveResult;
      if(!cerealSize)
        cerealSize = os.tellp();

      auto loadResult = loadData<DataT>( os, {SerializationT::cereal::template load<DataT>} );
      totalCerealLoad += loadResult.second;

      if( validateData )
        ; // TODO
    }
  }

  // Averages
  double averageBoostSave = totalBoostSave.count() / static_cast<double>( numAverages );
  double averageBoostLoad = totalBoostLoad.count() / static_cast<double>( numAverages );

  double averageCerealSave = totalCerealSave.count() / static_cast<double>( numAverages );
  double averageCerealLoad = totalCerealLoad.count() / static_cast<double>( numAverages );

  // Percentages relative to boost
  double cerealSaveP = averageCerealSave / averageBoostSave;
  double cerealLoadP = averageCerealLoad / averageBoostLoad;
  double cerealSizeP = cerealSize / static_cast<double>( boostSize );

  std::cout << "  Boost results:" << std::endl;
  std::cout << boost::format("\tsave | time: %06.4fms (%1.2f) size: %20.8fkb (%1.8f) total: %6.1fms")
    % averageBoostSave % 1.0 % (boostSize / 1024.0) % 1.0 % static_cast<double>( totalBoostSave.count() );
  std::cout << std::endl;
  std::cout << boost::format("\tload | time: %06.4fms (%1.2f) total: %6.1fms")
    % averageBoostLoad % 1.0 % static_cast<double>( totalBoostLoad.count() );
  std::cout << std::endl;

  std::cout << "  Cereal results:" << std::endl;
  std::cout << boost::format("\tsave | time: %06.4fms (%1.2f) size: %20.8fkb (%1.8f) total: %6.1fms")
    % averageCerealSave % cerealSaveP % (cerealSize / 1024.0) % cerealSizeP % static_cast<double>( totalCerealSave.count() );
  std::cout << std::endl;
  std::cout << boost::format("\tload | time: %06.4fms (%1.2f) total: %6.1fms")
    % averageCerealLoad % 1.0 % static_cast<double>( totalCerealLoad.count() );
  std::cout << std::endl;
}

template<class T>
typename std::enable_if<std::is_floating_point<T>::value, T>::type
random_value(std::mt19937 & gen)
{ return std::uniform_real_distribution<T>(-10000.0, 10000.0)(gen); }

template<class T>
typename std::enable_if<std::is_integral<T>::value, T>::type
random_value(std::mt19937 & gen)
{ return std::uniform_int_distribution<T>(std::numeric_limits<T>::lowest(), std::numeric_limits<T>::max())(gen); }

template<class T>
typename std::enable_if<std::is_same<T, std::string>::value, std::string>::type
random_value(std::mt19937 & gen)
{
  std::string s(std::uniform_int_distribution<int>(3, 30)(gen), ' ');
  for(char & c : s)
    c = std::uniform_int_distribution<char>(' ', '~')(gen);
  return s;
}

template<class C>
std::basic_string<C> random_basic_string(std::mt19937 & gen)
{
  std::basic_string<C> s(std::uniform_int_distribution<int>(3, 30)(gen), ' ');
  for(C & c : s)
    c = std::uniform_int_distribution<C>(' ', '~')(gen);
  return s;
}

template <size_t N>
std::string random_binary_string(std::mt19937 & gen)
{
  std::string s(N, ' ');
  for(auto & c : s )
    c = std::uniform_int_distribution<char>('0', '1')(gen);
  return s;
}

struct PoDStruct
{
  int32_t a;
  int64_t b;
  float c;
  double d;

  template <class Archive>
  void serialize( Archive & ar )
  {
    ar & a & b & c & d;
  };

  template <class Archive>
  void serialize( Archive & ar, const unsigned int version )
  {
    ar & a & b & c & d;
  };
};

int main()
{
  std::random_device rd;
  std::mt19937 gen(rd());
  auto rngC = [&](){ return random_value<uint8_t>(gen); };
  auto rngD = [&](){ return random_value<double>(gen); };

  auto vectorDoubleTest = [&](size_t s, bool randomize)
  {
    std::ostringstream name;
    name << "Vector(double) size " << s;

    std::vector<double> data(s);
    if(randomize)
      for( auto & d : data )
        d = rngD();

    test<binary>( name.str(), data );
  };

  auto vectorCharTest = [&](size_t s, bool randomize)
  {
    std::ostringstream name;
    name << "Vector(uint8_t) size " << s;

    std::vector<uint8_t> data(s);
    if(randomize)
      for( auto & d : data )
        d = rngC();

    test<binary>( name.str(), data );
  };

  const bool randomize = false;

  vectorDoubleTest(1, randomize); // 8B
  vectorDoubleTest(16, randomize); // 128B
  vectorDoubleTest(1024, randomize); // 8KB
  vectorDoubleTest(1024*1024, randomize); // 8MB

  vectorCharTest(1024*1024*1024, randomize); // 1 GB

  auto vectorPoDStructTest = [&](size_t s)
  {
    std::ostringstream name;
    name << "Vector(PoDStruct) size " << s;

    std::vector<PoDStruct> data(s);
    test<binary>( name.str(), data );
  };

  vectorPoDStructTest(1);
  vectorPoDStructTest(64);
  vectorPoDStructTest(1024);
  vectorPoDStructTest(1024*1024);
  vectorPoDStructTest(1024*1024*64);

  return 0;
}