1// Copyright (c) 2024-present The Bitcoin Core developers
2// Distributed under the MIT software license, see the accompanying
3// file COPYING or http://www.opensource.org/licenses/mit-license.php.
4
5#ifndef BITCOIN_KERNEL_CACHES_H
6#define BITCOIN_KERNEL_CACHES_H
7
8#include <util/byte_units.h>
9
10#include <algorithm>
11#include <cstdint>
12#include <limits>
13
14//! Minimum total database cache (bytes)
15inline constexpr uint64_t MIN_DBCACHE_BYTES{4_MiB};
16//! Maximum total database cache on current architecture (bytes)
17inline constexpr uint64_t MAX_DBCACHE_BYTES{sizeof(void*) == 4 ? 1_GiB : std::numeric_limits<uint64_t>::max()};
18//! Suggested default amount of cache reserved for the kernel (bytes)
19inline constexpr uint64_t DEFAULT_KERNEL_CACHE{450_MiB};
20//! Default LevelDB write batch size
21inline constexpr uint64_t DEFAULT_DB_CACHE_BATCH{32_MiB};
22
23//! Max memory allocated to block tree DB specific cache (bytes)
24inline constexpr uint64_t MAX_BLOCK_DB_CACHE{2_MiB};
25//! Max memory allocated to coin DB specific cache (bytes)
26inline constexpr uint64_t MAX_COINS_DB_CACHE{8_MiB};
27
28namespace kernel {
29struct CacheSizes {
30    uint64_t block_tree_db;
31    uint64_t coins_db;
32    uint64_t coins;
33
34    CacheSizes(uint64_t total_cache)
35    {
36        block_tree_db = std::min(total_cache / 8, MAX_BLOCK_DB_CACHE);
37        total_cache -= block_tree_db;
38        coins_db = std::min(total_cache / 2, MAX_COINS_DB_CACHE);
39        total_cache -= coins_db;
40        coins = total_cache; // the rest goes to the coins cache
41    }
42};
43} // namespace kernel
44
45#endif // BITCOIN_KERNEL_CACHES_H
46