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The default database write batch size is increased from 16 MiB to 32 MiB to improve I/O efficiency and performance during UTXO flushes, particularly during Initial Block Download and `assumeutxo` loads. On systems with slower I/O, a larger batch size reduces overhead from numerous small writes. Measurements show this change provides a modest performance improvement on most hardware during a critical section, with a minimal peak memory increase (approx. 75 MiB on default settings).
40 lines
1.2 KiB
C++
40 lines
1.2 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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//! Suggested default amount of cache reserved for the kernel (bytes)
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static constexpr size_t DEFAULT_KERNEL_CACHE{450_MiB};
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//! Default LevelDB write batch size
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static constexpr size_t DEFAULT_DB_CACHE_BATCH{32_MiB};
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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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