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Merge bitcoin/bitcoin#34692: Bump dbcache to 1 GiB

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4ae9a10ada doc: add release notes for dbcache bump (Andrew Toth)
c510d126ef doc: update dbcache default in reduce-memory.md (Andrew Toth)
027cac8527 qt: show GetDefaultDBCache() in settings (Andrew Toth)
5b34f25184 dbcache: bump default from 450MB -> 1024MB if enough memory (Andrew Toth)

Pull request description:

  Alternative to #34641

  This increases the default `dbcache` value from `450MiB` to `1024MiB` if:
  - `dbcache` is unset
  - The system is 64 bit
  - At least 4GiB of RAM is detected

  Otherwise fallback to previous `450MiB` default.

  This should be simple enough to get into v31. The bump to 1GiB shows significant performance increases in #34641. It also alleviates concerns of too high default for steady state, and of lowering the current dbcache for systems with less RAM.

  This change only changes bitcoind behavior, while kernel still defaults to 450 MiB.

ACKs for top commit:
  ajtowns:
    ACK 4ae9a10ada
  kevkevinpal:
    reACK [4ae9a10](4ae9a10ada)
  svanstaa:
    ACK [4ae9a10](4ae9a10ada)
  achow101:
    ACK 4ae9a10ada
  sipa:
    ACK 4ae9a10ada

Tree-SHA512: ee3acf1fb08523ac80e37ec8f0caca226ffde6667f3a75ae6f4f4f54bc905a883ebcf1bf0e8a8a15c7cfabff96c23225825b3fff4506b9ab9936bf2c0a2c2513
This commit is contained in:
Ava Chow
2026-03-06 12:07:41 -08:00
parent 8b70ed6996 4ae9a10ada
commit c7a3ea2483
6 changed files with 25 additions and 4 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);