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// Copyright (c) 2019 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 <txmempool.h>
#include <validation.h>
#include <sync.h>
#include <test/util/setup_common.h>
#include <boost/test/unit_test.hpp>
BOOST_FIXTURE_TEST_SUITE(validation_flush_tests, BasicTestingSetup)
//! Test utilities for detecting when we need to flush the coins cache based
//! on estimated memory usage.
//!
//! @sa CChainState::GetCoinsCacheSizeState()
//!
BOOST_AUTO_TEST_CASE(getcoinscachesizestate)
{
BlockManager blockman{};
CChainState chainstate{blockman};
chainstate.InitCoinsDB(/*cache_size_bytes*/ 1 << 10, /*in_memory*/ true, /*should_wipe*/ false);
WITH_LOCK(::cs_main, chainstate.InitCoinsCache());
CTxMemPool tx_pool{};
constexpr bool is_64_bit = sizeof(void*) == 8;
LOCK(::cs_main);
auto& view = chainstate.CoinsTip();
//! Create and add a Coin with DynamicMemoryUsage of 80 bytes to the given view.
auto add_coin = [](CCoinsViewCache& coins_view) -> COutPoint {
Coin newcoin;
uint256 txid = InsecureRand256();
COutPoint outp{txid, 0};
newcoin.nHeight = 1;
newcoin.out.nValue = InsecureRand32();
newcoin.out.scriptPubKey.assign((uint32_t)56, 1);
coins_view.AddCoin(outp, std::move(newcoin), false);
return outp;
};
// The number of bytes consumed by coin's heap data, i.e. CScript
// (prevector<28, unsigned char>) when assigned 56 bytes of data per above.
//
// See also: Coin::DynamicMemoryUsage().
constexpr int COIN_SIZE = is_64_bit ? 80 : 64;
auto print_view_mem_usage = [](CCoinsViewCache& view) {
BOOST_TEST_MESSAGE("CCoinsViewCache memory usage: " << view.DynamicMemoryUsage());
};
constexpr size_t MAX_COINS_CACHE_BYTES = 1024;
// Without any coins in the cache, we shouldn't need to flush.
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
CoinsCacheSizeState::OK);
// If the initial memory allocations of cacheCoins don't match these common
// cases, we can't really continue to make assertions about memory usage.
// End the test early.
if (view.DynamicMemoryUsage() != 32 && view.DynamicMemoryUsage() != 16) {
// Add a bunch of coins to see that we at least flip over to CRITICAL.
for (int i{0}; i < 1000; ++i) {
COutPoint res = add_coin(view);
BOOST_CHECK_EQUAL(view.AccessCoin(res).DynamicMemoryUsage(), COIN_SIZE);
}
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
CoinsCacheSizeState::CRITICAL);
BOOST_TEST_MESSAGE("Exiting cache flush tests early due to unsupported arch");
return;
}
print_view_mem_usage(view);
BOOST_CHECK_EQUAL(view.DynamicMemoryUsage(), is_64_bit ? 32 : 16);
// We should be able to add COINS_UNTIL_CRITICAL coins to the cache before going CRITICAL.
// This is contingent not only on the dynamic memory usage of the Coins
// that we're adding (COIN_SIZE bytes per), but also on how much memory the
// cacheCoins (unordered_map) preallocates.
//
// I came up with the count by examining the printed memory usage of the
// CCoinsCacheView, so it's sort of arbitrary - but it shouldn't change
// unless we somehow change the way the cacheCoins map allocates memory.
//
constexpr int COINS_UNTIL_CRITICAL = is_64_bit ? 4 : 5;
for (int i{0}; i < COINS_UNTIL_CRITICAL; ++i) {
COutPoint res = add_coin(view);
print_view_mem_usage(view);
BOOST_CHECK_EQUAL(view.AccessCoin(res).DynamicMemoryUsage(), COIN_SIZE);
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
CoinsCacheSizeState::OK);
}
// Adding an additional coin will push us over the edge to CRITICAL.
add_coin(view);
print_view_mem_usage(view);
auto size_state = chainstate.GetCoinsCacheSizeState(
tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0);
if (!is_64_bit && size_state == CoinsCacheSizeState::LARGE) {
// On 32 bit hosts, we may hit LARGE before CRITICAL.
add_coin(view);
print_view_mem_usage(view);
}
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 0),
CoinsCacheSizeState::CRITICAL);
// Passing non-zero max mempool usage should allow us more headroom.
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 1 << 10),
CoinsCacheSizeState::OK);
for (int i{0}; i < 3; ++i) {
add_coin(view);
print_view_mem_usage(view);
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, /*max_mempool_size_bytes*/ 1 << 10),
CoinsCacheSizeState::OK);
}
// Adding another coin with the additional mempool room will put us >90%
// but not yet critical.
add_coin(view);
print_view_mem_usage(view);
// Only perform these checks on 64 bit hosts; I haven't done the math for 32.
if (is_64_bit) {
float usage_percentage = (float)view.DynamicMemoryUsage() / (MAX_COINS_CACHE_BYTES + (1 << 10));
BOOST_TEST_MESSAGE("CoinsTip usage percentage: " << usage_percentage);
BOOST_CHECK(usage_percentage >= 0.9);
BOOST_CHECK(usage_percentage < 1);
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, 1 << 10),
CoinsCacheSizeState::LARGE);
}
// Using the default max_* values permits way more coins to be added.
for (int i{0}; i < 1000; ++i) {
add_coin(view);
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool),
CoinsCacheSizeState::OK);
}
// Flushing the view doesn't take us back to OK because cacheCoins has
// preallocated memory that doesn't get reclaimed even after flush.
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, 0),
CoinsCacheSizeState::CRITICAL);
view.SetBestBlock(InsecureRand256());
BOOST_CHECK(view.Flush());
print_view_mem_usage(view);
BOOST_CHECK_EQUAL(
chainstate.GetCoinsCacheSizeState(tx_pool, MAX_COINS_CACHE_BYTES, 0),
CoinsCacheSizeState::CRITICAL);
}
BOOST_AUTO_TEST_SUITE_END()
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