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e758b26b85
Carrying non-kernel related fields in the cache sizes for the indexes is confusing for kernel library users. The cache sizes also are set currently with magic numbers in bitcoin-chainstate. The comments for the cache size calculations are also not completely clear. Solve these things by moving the kernel-specific cache size fields to their own struct. This slightly changes the way the cache is allocated if the txindex and/or blockfilterindex is used. Since they are now given precedence over the block tree db cache, this results in a bit less cache being allocated to the block tree db, coinsdb and coins caches. The effect is negligible though, i.e. cache sizes with default dbcache reported through the logs are: master: Cache configuration: * Using 2.0 MiB for block index database * Using 56.0 MiB for transaction index database * Using 49.0 MiB for basic block filter index database * Using 8.0 MiB for chain state database * Using 335.0 MiB for in-memory UTXO set (plus up to 286.1 MiB of unused mempool space) this branch: Cache configuration: * Using 2.0 MiB for block index database * Using 56.2 MiB for transaction index database * Using 49.2 MiB for basic block filter index database * Using 8.0 MiB for chain state database * Using 334.5 MiB for in-memory UTXO set (plus up to 286.1 MiB of unused mempool space)
35 lines
1.0 KiB
C++
35 lines
1.0 KiB
C++
// Copyright (c) 2024-present The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_KERNEL_CACHES_H
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#define BITCOIN_KERNEL_CACHES_H
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#include <util/byte_units.h>
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#include <algorithm>
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//! Max memory allocated to block tree DB specific cache (bytes)
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static constexpr size_t MAX_BLOCK_DB_CACHE{2_MiB};
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//! Max memory allocated to coin DB specific cache (bytes)
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static constexpr size_t MAX_COINS_DB_CACHE{8_MiB};
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namespace kernel {
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struct CacheSizes {
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size_t block_tree_db;
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size_t coins_db;
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size_t coins;
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CacheSizes(size_t total_cache)
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{
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block_tree_db = std::min(total_cache / 8, MAX_BLOCK_DB_CACHE);
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total_cache -= block_tree_db;
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coins_db = std::min(total_cache / 2, MAX_COINS_DB_CACHE);
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total_cache -= coins_db;
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coins = total_cache; // the rest goes to the coins cache
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}
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};
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} // namespace kernel
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#endif // BITCOIN_KERNEL_CACHES_H
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