mirror of
https://github.com/bitcoin/bitcoin.git
synced 2025-02-09 10:43:19 -05:00
95 lines
4.4 KiB
C++
95 lines
4.4 KiB
C++
// Copyright (c) 2023 The Bitcoin Core developers
|
|
// Distributed under the MIT software license, see the accompanying
|
|
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
|
|
//
|
|
#include <boost/test/unit_test.hpp>
|
|
#include <core_memusage.h>
|
|
#include <kernel/disconnected_transactions.h>
|
|
#include <test/util/setup_common.h>
|
|
|
|
BOOST_FIXTURE_TEST_SUITE(disconnected_transactions, TestChain100Setup)
|
|
|
|
//! Tests that DisconnectedBlockTransactions limits its own memory properly
|
|
BOOST_AUTO_TEST_CASE(disconnectpool_memory_limits)
|
|
{
|
|
// Use the coinbase transactions from TestChain100Setup. It doesn't matter whether these
|
|
// transactions would realistically be in a block together, they just need distinct txids and
|
|
// uniform size for this test to work.
|
|
std::vector<CTransactionRef> block_vtx(m_coinbase_txns);
|
|
BOOST_CHECK_EQUAL(block_vtx.size(), 100);
|
|
|
|
// Roughly estimate sizes to sanity check that DisconnectedBlockTransactions::DynamicMemoryUsage
|
|
// is within an expected range.
|
|
|
|
// Overhead for the hashmap depends on number of buckets
|
|
std::unordered_map<uint256, CTransaction*, SaltedTxidHasher> temp_map;
|
|
temp_map.reserve(1);
|
|
const size_t MAP_1{memusage::DynamicUsage(temp_map)};
|
|
temp_map.reserve(100);
|
|
const size_t MAP_100{memusage::DynamicUsage(temp_map)};
|
|
|
|
const size_t TX_USAGE{RecursiveDynamicUsage(block_vtx.front())};
|
|
for (const auto& tx : block_vtx)
|
|
BOOST_CHECK_EQUAL(RecursiveDynamicUsage(tx), TX_USAGE);
|
|
|
|
// Our overall formula is unordered map overhead + usage per entry.
|
|
// Implementations may vary, but we're trying to guess the usage of data structures.
|
|
const size_t ENTRY_USAGE_ESTIMATE{
|
|
TX_USAGE
|
|
// list entry: 2 pointers (next pointer and prev pointer) + element itself
|
|
+ memusage::MallocUsage((2 * sizeof(void*)) + sizeof(decltype(block_vtx)::value_type))
|
|
// unordered map: 1 pointer for the hashtable + key and value
|
|
+ memusage::MallocUsage(sizeof(void*) + sizeof(decltype(temp_map)::key_type)
|
|
+ sizeof(decltype(temp_map)::value_type))};
|
|
|
|
// DisconnectedBlockTransactions that's just big enough for 1 transaction.
|
|
{
|
|
DisconnectedBlockTransactions disconnectpool{MAP_1 + ENTRY_USAGE_ESTIMATE};
|
|
// Add just 2 (and not all 100) transactions to keep the unordered map's hashtable overhead
|
|
// to a minimum and avoid all (instead of all but 1) transactions getting evicted.
|
|
std::vector<CTransactionRef> two_txns({block_vtx.at(0), block_vtx.at(1)});
|
|
auto evicted_txns{disconnectpool.AddTransactionsFromBlock(two_txns)};
|
|
BOOST_CHECK(disconnectpool.DynamicMemoryUsage() <= MAP_1 + ENTRY_USAGE_ESTIMATE);
|
|
|
|
// Only 1 transaction can be kept
|
|
BOOST_CHECK_EQUAL(1, evicted_txns.size());
|
|
// Transactions are added from back to front and eviction is FIFO.
|
|
BOOST_CHECK_EQUAL(block_vtx.at(1), evicted_txns.front());
|
|
|
|
disconnectpool.clear();
|
|
}
|
|
|
|
// DisconnectedBlockTransactions with a comfortable maximum memory usage so that nothing is evicted.
|
|
// Record usage so we can check size limiting in the next test.
|
|
size_t usage_full{0};
|
|
{
|
|
const size_t USAGE_100_OVERESTIMATE{MAP_100 + ENTRY_USAGE_ESTIMATE * 100};
|
|
DisconnectedBlockTransactions disconnectpool{USAGE_100_OVERESTIMATE};
|
|
auto evicted_txns{disconnectpool.AddTransactionsFromBlock(block_vtx)};
|
|
BOOST_CHECK_EQUAL(evicted_txns.size(), 0);
|
|
BOOST_CHECK(disconnectpool.DynamicMemoryUsage() <= USAGE_100_OVERESTIMATE);
|
|
|
|
usage_full = disconnectpool.DynamicMemoryUsage();
|
|
|
|
disconnectpool.clear();
|
|
}
|
|
|
|
// DisconnectedBlockTransactions that's just a little too small for all of the transactions.
|
|
{
|
|
const size_t MAX_MEMUSAGE_99{usage_full - sizeof(void*)};
|
|
DisconnectedBlockTransactions disconnectpool{MAX_MEMUSAGE_99};
|
|
auto evicted_txns{disconnectpool.AddTransactionsFromBlock(block_vtx)};
|
|
BOOST_CHECK(disconnectpool.DynamicMemoryUsage() <= MAX_MEMUSAGE_99);
|
|
|
|
// Only 1 transaction needed to be evicted
|
|
BOOST_CHECK_EQUAL(1, evicted_txns.size());
|
|
|
|
// Transactions are added from back to front and eviction is FIFO.
|
|
// The last transaction of block_vtx should be the first to be evicted.
|
|
BOOST_CHECK_EQUAL(block_vtx.back(), evicted_txns.front());
|
|
|
|
disconnectpool.clear();
|
|
}
|
|
}
|
|
|
|
BOOST_AUTO_TEST_SUITE_END()
|