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// Copyright (C) 2015-2025 Jonathan Müller and foonathan/memory contributors
// SPDX-License-Identifier: Zlib
#ifndef FOONATHAN_MEMORY_TEST_BENCHMARK_HPP_INCLUDED
#define FOONATHAN_MEMORY_TEST_BENCHMARK_HPP_INCLUDED
// Benchmarking functions and allocator scenarios
#include <algorithm>
#include <chrono>
#include <random>
#include <vector>
#include "foonathan/memory/allocator_traits.hpp"
using unit = std::chrono::nanoseconds;
template <typename F, typename... Args>
std::size_t measure(F func, Args&&... args)
{
auto start = std::chrono::system_clock::now();
func(std::forward<Args>(args)...);
auto duration = std::chrono::duration_cast<unit>(std::chrono::system_clock::now() - start);
return std::size_t(duration.count());
}
std::size_t sample_size = 1024u;
template <typename F, typename Alloc, typename... Args>
std::size_t benchmark(F measure_func, Alloc make_alloc, Args&&... args)
{
auto min_time = std::size_t(-1);
for (std::size_t i = 0u; i != sample_size; ++i)
{
auto alloc = make_alloc();
auto time = measure_func(alloc, std::forward<Args>(args)...);
if (time < min_time)
min_time = time;
}
return min_time;
}
struct single
{
std::size_t count;
single(std::size_t c) : count(c) {}
template <class RawAllocator>
std::size_t operator()(RawAllocator& alloc, std::size_t size)
{
using namespace foonathan::memory;
return measure(
[&]()
{
for (std::size_t i = 0u; i != count; ++i)
{
volatile auto ptr =
allocator_traits<RawAllocator>::allocate_node(alloc, size, 1);
allocator_traits<RawAllocator>::deallocate_node(alloc, ptr, size, 1);
}
});
}
template <class RawAllocator>
std::size_t operator()(RawAllocator& alloc, std::size_t array_size, std::size_t node_size)
{
return measure(
[&]()
{
for (std::size_t i = 0u; i != count; ++i)
{
auto ptr = allocator_traits<RawAllocator>::allocate_array(alloc, array_size,
node_size, 1);
allocator_traits<RawAllocator>::deallocate_array(alloc, ptr, array_size,
node_size, 1);
}
});
}
static const char* name()
{
return "single";
}
};
struct basic_bulk
{
using order_func = void (*)(std::vector<void*>&);
order_func func;
std::size_t count;
basic_bulk(order_func f, std::size_t c) : func(f), count(c) {}
template <class RawAllocator>
std::size_t operator()(RawAllocator& alloc, std::size_t node_size)
{
using namespace foonathan::memory;
std::vector<void*> ptrs;
ptrs.reserve(count);
auto alloc_t = measure(
[&]()
{
for (std::size_t i = 0u; i != count; ++i)
ptrs.push_back(
allocator_traits<RawAllocator>::allocate_node(alloc, node_size, 1));
});
func(ptrs);
auto dealloc_t = measure(
[&]()
{
for (auto ptr : ptrs)
allocator_traits<RawAllocator>::deallocate_node(alloc, ptr, node_size, 1);
});
return alloc_t + dealloc_t;
}
template <class RawAllocator>
std::size_t operator()(RawAllocator& alloc, std::size_t array_size, std::size_t node_size)
{
using namespace foonathan::memory;
std::vector<void*> ptrs;
ptrs.reserve(count);
auto alloc_t = measure(
[&]()
{
for (std::size_t i = 0u; i != count; ++i)
ptrs.push_back(allocator_traits<RawAllocator>::allocate_array(alloc, array_size,
node_size, 1));
});
func(ptrs);
auto dealloc_t = measure(
[&]()
{
for (auto ptr : ptrs)
allocator_traits<RawAllocator>::deallocate_array(alloc, ptr, array_size,
node_size, 1);
});
return alloc_t + dealloc_t;
}
};
struct bulk : basic_bulk
{
bulk(std::size_t c) : basic_bulk([](std::vector<void*>&) {}, c) {}
static const char* name()
{
return "bulk";
}
};
struct bulk_reversed : basic_bulk
{
bulk_reversed(std::size_t c)
: basic_bulk([](std::vector<void*>& ptrs) { std::reverse(ptrs.begin(), ptrs.end()); }, c)
{
}
static const char* name()
{
return "bulk_reversed";
}
};
struct butterfly : basic_bulk
{
butterfly(std::size_t c)
: basic_bulk([](std::vector<void*>& ptrs)
{ std::shuffle(ptrs.begin(), ptrs.end(), std::mt19937{}); }, c)
{
}
static const char* name()
{
return "butterfly\n";
}
};
#endif // FOONATHAN_MEMORY_TEST_BENCHMARK_HPP_INCLUDED
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