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318 lines (239 loc) · 7.43 KB
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// Copyright 2021 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#define _SILENCE_CXX17_OLD_ALLOCATOR_MEMBERS_DEPRECATION_WARNING
#include <boost/unordered_map.hpp>
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/member.hpp>
#include <boost/core/detail/splitmix64.hpp>
#include <boost/config.hpp>
#ifdef HAVE_ABSEIL
# include "absl/container/node_hash_map.h"
# include "absl/container/flat_hash_map.h"
#endif
#include <unordered_map>
#include <map>
#include <cstdint>
#include <iostream>
#include <chrono>
using namespace std::chrono_literals;
static void print_time( std::chrono::steady_clock::time_point & t1, char const* label, std::uint32_t s, std::size_t size )
{
auto t2 = std::chrono::steady_clock::now();
std::cout << label << ": " << ( t2 - t1 ) / 1ms << " ms (s=" << s << ", size=" << size << ")\n";
t1 = t2;
}
constexpr unsigned N = 2'000'000;
constexpr int K = 10;
static std::vector<std::string> indices1, indices2;
static std::string make_index( unsigned x )
{
char buffer[ 64 ];
std::snprintf( buffer, sizeof(buffer), "pfx_%u_sfx", x );
return buffer;
}
static std::string make_random_index( unsigned x )
{
char buffer[ 64 ];
std::snprintf( buffer, sizeof(buffer), "pfx_%0*d_%u_sfx", x % 8 + 1, 0, x );
return buffer;
}
static void init_indices()
{
indices1.reserve( N*2+1 );
indices1.push_back( make_index( 0 ) );
for( unsigned i = 1; i <= N*2; ++i )
{
indices1.push_back( make_index( i ) );
}
indices2.reserve( N*2+1 );
indices2.push_back( make_index( 0 ) );
{
boost::detail::splitmix64 rng;
for( unsigned i = 1; i <= N*2; ++i )
{
indices2.push_back( make_random_index( static_cast<std::uint32_t>( rng() ) ) );
}
}
}
template<class Map> BOOST_NOINLINE void test_insert( Map& map, std::chrono::steady_clock::time_point & t1 )
{
for( unsigned i = 1; i <= N; ++i )
{
map.insert( { indices1[ i ], i } );
}
print_time( t1, "Consecutive insert", 0, map.size() );
for( unsigned i = 1; i <= N; ++i )
{
map.insert( { indices2[ i ], i } );
}
print_time( t1, "Random insert", 0, map.size() );
std::cout << std::endl;
}
template<class Map> BOOST_NOINLINE void test_lookup( Map& map, std::chrono::steady_clock::time_point & t1 )
{
std::uint32_t s;
s = 0;
for( int j = 0; j < K; ++j )
{
for( unsigned i = 1; i <= N * 2; ++i )
{
auto it = map.find( indices1[ i ] );
if( it != map.end() ) s += it->second;
}
}
print_time( t1, "Consecutive lookup", s, map.size() );
s = 0;
for( int j = 0; j < K; ++j )
{
for( unsigned i = 1; i <= N * 2; ++i )
{
auto it = map.find( indices2[ i ] );
if( it != map.end() ) s += it->second;
}
}
print_time( t1, "Random lookup", s, map.size() );
std::cout << std::endl;
}
template<class Map> BOOST_NOINLINE void test_iteration( Map& map, std::chrono::steady_clock::time_point & t1 )
{
auto it = map.begin();
while( it != map.end() )
{
if( it->second & 1 )
{
map.erase( it++ );
}
else
{
++it;
}
}
print_time( t1, "Iterate and erase odd elements", 0, map.size() );
std::cout << std::endl;
}
template<class Map> BOOST_NOINLINE void test_erase( Map& map, std::chrono::steady_clock::time_point & t1 )
{
for( unsigned i = 1; i <= N; ++i )
{
map.erase( indices1[ i ] );
}
print_time( t1, "Consecutive erase", 0, map.size() );
{
boost::detail::splitmix64 rng;
for( unsigned i = 1; i <= N; ++i )
{
map.erase( indices2[ i ] );
}
}
print_time( t1, "Random erase", 0, map.size() );
std::cout << std::endl;
}
static std::vector< std::pair<std::string, long long> > times;
template<template<class...> class Map> BOOST_NOINLINE void test( char const* label )
{
std::cout << label << ":\n\n";
Map<std::string, std::uint32_t> map;
auto t0 = std::chrono::steady_clock::now();
auto t1 = t0;
test_insert( map, t1 );
test_lookup( map, t1 );
test_iteration( map, t1 );
test_lookup( map, t1 );
test_erase( map, t1 );
auto tN = std::chrono::steady_clock::now();
std::cout << "Total: " << ( tN - t0 ) / 1ms << " ms\n\n";
times.push_back( { label, ( tN - t0 ) / 1ms } );
}
// multi_index emulation of unordered_map
template<class K, class V> struct pair
{
K first;
mutable V second;
};
using namespace boost::multi_index;
template<class K, class V> using multi_index_map = multi_index_container<
pair<K, V>,
indexed_by<
hashed_unique< member<pair<K, V>, K, &pair<K, V>::first> >
>
>;
// fnv1a_hash
template<int Bits> struct fnv1a_hash_impl;
template<> struct fnv1a_hash_impl<32>
{
std::size_t operator()( std::string const& s ) const
{
std::size_t h = 0x811C9DC5u;
char const * first = s.data();
char const * last = first + s.size();
for( ; first != last; ++first )
{
h ^= static_cast<unsigned char>( *first );
h *= 0x01000193ul;
}
return h;
}
};
template<> struct fnv1a_hash_impl<64>
{
std::size_t operator()( std::string const& s ) const
{
std::size_t h = 0xCBF29CE484222325ull;
char const * first = s.data();
char const * last = first + s.size();
for( ; first != last; ++first )
{
h ^= static_cast<unsigned char>( *first );
h *= 0x00000100000001B3ull;
}
return h;
}
};
struct fnv1a_hash: fnv1a_hash_impl< std::numeric_limits<std::size_t>::digits > {};
template<class K, class V> using std_unordered_map_fnv1a =
std::unordered_map<K, V, fnv1a_hash>;
template<class K, class V> using boost_unordered_map_fnv1a =
boost::unordered_map<K, V, fnv1a_hash>;
template<class K, class V> using multi_index_map_fnv1a = multi_index_container<
pair<K, V>,
indexed_by<
hashed_unique< member<pair<K, V>, K, &pair<K, V>::first>, fnv1a_hash >
>
>;
#ifdef HAVE_ABSEIL
template<class K, class V> using absl_node_hash_map_fnv1a =
absl::node_hash_map<K, V, fnv1a_hash>;
template<class K, class V> using absl_flat_hash_map_fnv1a =
absl::flat_hash_map<K, V, fnv1a_hash>;
#endif
//
int main()
{
init_indices();
test<std::unordered_map>( "std::unordered_map" );
test<std_unordered_map_fnv1a>( "std::unordered_map, FNV-1a" );
test<boost::unordered_map>( "boost::unordered_map" );
test<boost_unordered_map_fnv1a>( "boost::unordered_map, FNV-1a" );
test<multi_index_map>( "multi_index_map" );
test<multi_index_map_fnv1a>( "multi_index_map, FNV-1a" );
// test<std::map>( "std::map" );
#ifdef HAVE_ABSEIL
test<absl::node_hash_map>( "absl::node_hash_map" );
test<absl_node_hash_map_fnv1a>( "absl::node_hash_map, FNV-1a" );
test<absl::flat_hash_map>( "absl::flat_hash_map" );
test<absl_flat_hash_map_fnv1a>( "absl::flat_hash_map, FNV-1a" );
#endif
std::cout << "---\n\n";
for( auto const& x: times )
{
std::cout << x.first << ": " << x.second << " ms\n";
}
}
#ifdef HAVE_ABSEIL
# include "absl/container/internal/raw_hash_set.cc"
# include "absl/hash/internal/hash.cc"
# include "absl/hash/internal/low_level_hash.cc"
# include "absl/hash/internal/city.cc"
#endif