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cd086c16dd
The alias is misleading because automatic selection can also return `HIGH_DEFAULT_DBCACHE`.
96 lines
4.0 KiB
C++
96 lines
4.0 KiB
C++
// Copyright (c) 2021-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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#include <node/caches.h>
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#include <common/args.h>
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#include <common/system.h>
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#include <index/txindex.h>
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#include <index/txospenderindex.h>
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#include <kernel/caches.h>
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#include <node/interface_ui.h>
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#include <tinyformat.h>
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#include <util/byte_units.h>
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#include <util/log.h>
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#include <util/overflow.h>
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#include <util/translation.h>
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#include <algorithm>
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#include <cstdint>
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#include <string>
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// Unlike for the UTXO database, for the txindex scenario the leveldb cache make
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// a meaningful difference: https://github.com/bitcoin/bitcoin/pull/8273#issuecomment-229601991
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//! Max memory allocated to tx index DB specific cache in bytes.
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static constexpr uint64_t MAX_TX_INDEX_CACHE{1_GiB};
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//! Max memory allocated to all block filter index caches combined in bytes.
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static constexpr uint64_t MAX_FILTER_INDEX_CACHE{1_GiB};
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//! Max memory allocated to tx spenderindex DB specific cache in bytes.
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static constexpr uint64_t MAX_TXOSPENDER_INDEX_CACHE{1_GiB};
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//! Larger default dbcache on 64-bit systems with enough RAM.
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static constexpr uint64_t HIGH_DEFAULT_DBCACHE{1_GiB};
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//! Minimum detected RAM required for HIGH_DEFAULT_DBCACHE.
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static constexpr uint64_t HIGH_DEFAULT_DBCACHE_MIN_TOTAL_RAM{4_GiB};
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namespace node {
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uint64_t GetDefaultDBCache()
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{
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if constexpr (sizeof(void*) >= 8) {
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if (TryGetTotalRam().value_or(0) >= HIGH_DEFAULT_DBCACHE_MIN_TOTAL_RAM) {
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return HIGH_DEFAULT_DBCACHE;
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}
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}
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return DEFAULT_KERNEL_CACHE;
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}
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uint64_t CalculateDbCacheBytes(const ArgsManager& args)
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{
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if (auto db_cache{args.GetIntArg("-dbcache")}) {
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if (*db_cache < 0) db_cache = 0;
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const uint64_t db_cache_bytes{SaturatingLeftShift<uint64_t>(*db_cache, 20)};
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return std::max(MIN_DBCACHE_BYTES, std::min(db_cache_bytes, MAX_DBCACHE_BYTES));
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}
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return GetDefaultDBCache();
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}
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CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes)
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{
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uint64_t total_cache{CalculateDbCacheBytes(args)};
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// Allocate proportional to usage pattern benefit:
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// - txindex (10%): serves getrawtransaction RPCs with mostly unique,
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// non-repetitive lookups across the entire blockchain.
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// - blockfilterindex (5%): serves BIP 157 light clients that repeatedly
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// query recent blocks, benefiting from LevelDB cache, but the
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// working set for a typical 2-week offline gap is ~200kiB, well within 5%
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// of the total cache.
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// - txospenderindex (5%): serves gettxspendingprevout RPCs with very
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// specific, rarely repeated outpoint queries.
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// - coinstatsindex: intentionally not included here, since usage pattern
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// does not seem to suggest it would be necessary to cache.
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IndexCacheSizes index_sizes;
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index_sizes.tx_index = std::min(total_cache * 10 / 100, args.GetBoolArg("-txindex", DEFAULT_TXINDEX) ? MAX_TX_INDEX_CACHE : 0);
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index_sizes.txospender_index = std::min(total_cache * 5 / 100, args.GetBoolArg("-txospenderindex", DEFAULT_TXOSPENDERINDEX) ? MAX_TXOSPENDER_INDEX_CACHE : 0);
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if (n_indexes > 0) {
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uint64_t max_cache = std::min(total_cache * 5 / 100, MAX_FILTER_INDEX_CACHE);
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index_sizes.filter_index = max_cache / n_indexes;
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total_cache -= index_sizes.filter_index * n_indexes;
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}
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total_cache -= index_sizes.tx_index;
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total_cache -= index_sizes.txospender_index;
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return {index_sizes, kernel::CacheSizes{total_cache}};
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}
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void LogOversizedDbCache(const ArgsManager& args) noexcept
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{
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if (const auto total_ram{TryGetTotalRam()}) {
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const uint64_t db_cache{CalculateDbCacheBytes(args)};
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if (ShouldWarnOversizedDbCache(db_cache, *total_ram)) {
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InitWarning(bilingual_str{tfm::format(_("A %zu MiB dbcache may be too large for a system memory of only %zu MiB."),
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db_cache / 1_MiB, *total_ram / 1_MiB)});
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}
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}
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}
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} // namespace node
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