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dbcache: bump default from 450MB -> 1024MB if enough memory

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If dbcache is unset, bump default from 450MB to 1024MB on 64-bit systems
that have at least 4GB of detected RAM.
This commit is contained in:
Andrew Toth 2026-02-27 09:17:00 -05:00
parent 3a8b4e89f6
commit 5b34f25184
No known key found for this signature in database
GPG Key ID: 60007AFC8938B018
3 changed files with 17 additions and 2 deletions
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2
src/init.cpp
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@ -503,7 +503,7 @@ void SetupServerArgs(ArgsManager& argsman, bool can_listen_ipc)
argsman.AddArg("-conf=<file>", strprintf("Specify path to read-only configuration file. Relative paths will be prefixed by datadir location (only useable from command line, not configuration file) (default: %s)", BITCOIN_CONF_FILENAME), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
argsman.AddArg("-datadir=<dir>", "Specify data directory", ArgsManager::ALLOW_ANY | ArgsManager::DISALLOW_NEGATION, OptionsCategory::OPTIONS);
argsman.AddArg("-dbbatchsize", strprintf("Maximum database write batch size in bytes (default: %u)", DEFAULT_DB_CACHE_BATCH), ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::OPTIONS);
argsman.AddArg("-dbcache=<n>", strprintf("Maximum database cache size <n> MiB (minimum %d, default: %d). Make sure you have enough RAM. In addition, unused memory allocated to the mempool is shared with this cache (see -maxmempool).", MIN_DB_CACHE >> 20, DEFAULT_DB_CACHE >> 20), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
argsman.AddArg("-dbcache=<n>", strprintf("Maximum database cache size <n> MiB (minimum %d, default: %d). Make sure you have enough RAM. In addition, unused memory allocated to the mempool is shared with this cache (see -maxmempool).", MIN_DB_CACHE >> 20, node::GetDefaultDBCache() >> 20), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
argsman.AddArg("-includeconf=<file>", "Specify additional configuration file, relative to the -datadir path (only useable from configuration file, not command line)", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
argsman.AddArg("-allowignoredconf", strprintf("For backwards compatibility, treat an unused %s file in the datadir as a warning, not an error.", BITCOIN_CONF_FILENAME), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
argsman.AddArg("-loadblock=<file>", "Imports blocks from external file on startup", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);

16
src/node/caches.cpp
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@ -27,8 +27,22 @@ static constexpr size_t MAX_FILTER_INDEX_CACHE{1024_MiB};
static constexpr size_t MAX_TXOSPENDER_INDEX_CACHE{1024_MiB};
//! Maximum dbcache size on 32-bit systems.
static constexpr size_t MAX_32BIT_DBCACHE{1024_MiB};
//! Larger default dbcache on 64-bit systems with enough RAM.
static constexpr size_t HIGH_DEFAULT_DBCACHE{1024_MiB};
//! Minimum detected RAM required for HIGH_DEFAULT_DBCACHE.
static constexpr uint64_t HIGH_DEFAULT_DBCACHE_MIN_TOTAL_RAM{4096ULL << 20};
namespace node {
size_t GetDefaultDBCache()
{
if constexpr (sizeof(void*) >= 8) {
if (GetTotalRAM().value_or(0) >= HIGH_DEFAULT_DBCACHE_MIN_TOTAL_RAM) {
return HIGH_DEFAULT_DBCACHE;
}
}
return DEFAULT_DB_CACHE;
}
size_t CalculateDbCacheBytes(const ArgsManager& args)
{
if (auto db_cache{args.GetIntArg("-dbcache")}) {
@ -37,7 +51,7 @@ size_t CalculateDbCacheBytes(const ArgsManager& args)
constexpr auto max_db_cache{sizeof(void*) == 4 ? MAX_32BIT_DBCACHE : std::numeric_limits<size_t>::max()};
return std::max<size_t>(MIN_DB_CACHE, std::min<uint64_t>(db_cache_bytes, max_db_cache));
}
return DEFAULT_DB_CACHE;
return GetDefaultDBCache();
}
CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes)

1
src/node/caches.h
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@ -18,6 +18,7 @@ static constexpr size_t MIN_DB_CACHE{4_MiB};
static constexpr size_t DEFAULT_DB_CACHE{DEFAULT_KERNEL_CACHE};
namespace node {
size_t GetDefaultDBCache();
struct IndexCacheSizes {
size_t tx_index{0};
size_t filter_index{0};