1 files changed, 32 insertions, 0 deletions
diff --git a/src/node/caches.cpp b/src/node/caches.cpp
new file mode 100644
index 0000000000..36254dc714
--- /dev/null
+++ b/src/node/caches.cpp
@@ -0,0 +1,32 @@
+// Copyright (c) 2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <node/caches.h>
+
+#include <txdb.h>
+#include <util/system.h>
+#include <validation.h>
+
+CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes)
+{
+    int64_t nTotalCache = (args.GetIntArg("-dbcache", nDefaultDbCache) << 20);
+    nTotalCache = std::max(nTotalCache, nMinDbCache << 20); // total cache cannot be less than nMinDbCache
+    nTotalCache = std::min(nTotalCache, nMaxDbCache << 20); // total cache cannot be greater than nMaxDbcache
+    CacheSizes sizes;
+    sizes.block_tree_db = std::min(nTotalCache / 8, nMaxBlockDBCache << 20);
+    nTotalCache -= sizes.block_tree_db;
+    sizes.tx_index = std::min(nTotalCache / 8, args.GetBoolArg("-txindex", DEFAULT_TXINDEX) ? nMaxTxIndexCache << 20 : 0);
+    nTotalCache -= sizes.tx_index;
+    sizes.filter_index = 0;
+    if (n_indexes > 0) {
+        int64_t max_cache = std::min(nTotalCache / 8, max_filter_index_cache << 20);
+        sizes.filter_index = max_cache / n_indexes;
+        nTotalCache -= sizes.filter_index * n_indexes;
+    }
+    sizes.coins_db = std::min(nTotalCache / 2, (nTotalCache / 4) + (1 << 23)); // use 25%-50% of the remainder for disk cache
+    sizes.coins_db = std::min(sizes.coins_db, nMaxCoinsDBCache << 20); // cap total coins db cache
+    nTotalCache -= sizes.coins_db;
+    sizes.coins = nTotalCache; // the rest goes to in-memory cache
+    return sizes;
+}