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d164a04342
The oversized `-dbcache` warning currently switches from a fixed `450 MiB` threshold below `2 GiB` of RAM to `75%` of total RAM at `2 GiB`. This creates a cliff where a small increase in RAM can raise the warning threshold to about `1536 MiB`. Apply the `75%` factor only to RAM above a `2 GiB` reserve while keeping `DEFAULT_DB_CACHE` as the minimum threshold. This removes the cliff: the threshold stays at the default until the percentage term exceeds it, then grows by `0.75 MiB` per additional MiB of RAM. This also aligns better with the recently merged parallel input prevout fetcher which performs better with slightly lower dbcache memory. Co-authored-by: Bortlesboat <Bortlesboat@users.noreply.github.com>
47 lines
1.4 KiB
C++
47 lines
1.4 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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#ifndef BITCOIN_NODE_CACHES_H
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#define BITCOIN_NODE_CACHES_H
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#include <kernel/caches.h>
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#include <util/byte_units.h>
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#include <algorithm>
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#include <cstddef>
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#include <cstdint>
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class ArgsManager;
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//! min. -dbcache (bytes)
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static constexpr uint64_t MIN_DB_CACHE{4_MiB};
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//! -dbcache default (bytes)
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static constexpr uint64_t DEFAULT_DB_CACHE{DEFAULT_KERNEL_CACHE};
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//! Reserved non-dbcache memory usage.
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static constexpr uint64_t DBCACHE_WARNING_RESERVED_RAM{2_GiB};
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namespace node {
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uint64_t GetDefaultDBCache();
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struct IndexCacheSizes {
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uint64_t tx_index{0};
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uint64_t filter_index{0};
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uint64_t txospender_index{0};
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};
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struct CacheSizes {
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IndexCacheSizes index;
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kernel::CacheSizes kernel;
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};
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CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes = 0);
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constexpr bool ShouldWarnOversizedDbCache(uint64_t dbcache, uint64_t total_ram) noexcept
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{
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const uint64_t available_ram{total_ram > DBCACHE_WARNING_RESERVED_RAM ? total_ram - DBCACHE_WARNING_RESERVED_RAM : 0};
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const uint64_t cap{std::max<uint64_t>(DEFAULT_DB_CACHE, (available_ram / 4) * 3)};
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return dbcache > cap;
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}
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void LogOversizedDbCache(const ArgsManager& args) noexcept;
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} // namespace node
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#endif // BITCOIN_NODE_CACHES_H
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