1  // Copyright (c) 2021-2022 The Bitcoin Core developers
 2  // Distributed under the MIT software license, see the accompanying
 3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 4  
 5  #include <node/caches.h>
 6  
 7  #include <common/args.h>
 8  #include <index/txindex.h>
 9  #include <txdb.h>
10  
11  namespace node {
12  CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes)
13  {
14      int64_t nTotalCache = (args.GetIntArg("-dbcache", nDefaultDbCache) << 20);
15      nTotalCache = std::max(nTotalCache, nMinDbCache << 20); // total cache cannot be less than nMinDbCache
16      nTotalCache = std::min(nTotalCache, nMaxDbCache << 20); // total cache cannot be greater than nMaxDbcache
17      CacheSizes sizes;
18      sizes.block_tree_db = std::min(nTotalCache / 8, nMaxBlockDBCache << 20);
19      nTotalCache -= sizes.block_tree_db;
20      sizes.tx_index = std::min(nTotalCache / 8, args.GetBoolArg("-txindex", DEFAULT_TXINDEX) ? nMaxTxIndexCache << 20 : 0);
21      nTotalCache -= sizes.tx_index;
22      sizes.filter_index = 0;
23      if (n_indexes > 0) {
24          int64_t max_cache = std::min(nTotalCache / 8, max_filter_index_cache << 20);
25          sizes.filter_index = max_cache / n_indexes;
26          nTotalCache -= sizes.filter_index * n_indexes;
27      }
28      sizes.coins_db = std::min(nTotalCache / 2, (nTotalCache / 4) + (1 << 23)); // use 25%-50% of the remainder for disk cache
29      sizes.coins_db = std::min(sizes.coins_db, nMaxCoinsDBCache << 20); // cap total coins db cache
30      nTotalCache -= sizes.coins_db;
31      sizes.coins = nTotalCache; // the rest goes to in-memory cache
32      return sizes;
33  }
34  } // namespace node