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node: allocate index caches proportional to usage patterns

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add comment explaining coinstatsindex cache exclusion

update cache allocations to 10%/5%/5%
This commit is contained in:
Sebastian van Staa
2026-02-20 13:18:54 +01:00
parent 04480c2558
commit d06dabf26b
1 changed files with 14 additions and 5 deletions
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19
src/node/caches.cpp
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@@ -58,16 +58,25 @@ CacheSizes CalculateCacheSizes(const ArgsManager& args, size_t n_indexes)
{
size_t total_cache{CalculateDbCacheBytes(args)};
// Allocate proportional to usage pattern benefit:
// - txindex (10%): serves getrawtransaction RPCs with mostly unique,
// non-repetitive lookups across the entire blockchain.
// - blockfilterindex (5%): serves BIP 157 light clients that repeatedly
// query recent blocks, benefiting most from LevelDB cache.
// - txospenderindex (5%): serves gettxspendingprevout RPCs with very
// specific, rarely repeated outpoint queries.
// - coinstatsindex: intentionally not included here, since usage pattern
// does not seem to suggest it would be necessary to cache.
IndexCacheSizes index_sizes;
index_sizes.tx_index = std::min(total_cache / 8, args.GetBoolArg("-txindex", DEFAULT_TXINDEX) ? MAX_TX_INDEX_CACHE : 0);
total_cache -= index_sizes.tx_index;
index_sizes.txospender_index = std::min(total_cache / 8, args.GetBoolArg("-txospenderindex", DEFAULT_TXOSPENDERINDEX) ? MAX_TXOSPENDER_INDEX_CACHE : 0);
total_cache -= index_sizes.txospender_index;
index_sizes.tx_index = std::min(total_cache * 10 / 100, args.GetBoolArg("-txindex", DEFAULT_TXINDEX) ? MAX_TX_INDEX_CACHE : 0);
index_sizes.txospender_index = std::min(total_cache * 5 / 100, args.GetBoolArg("-txospenderindex", DEFAULT_TXOSPENDERINDEX) ? MAX_TXOSPENDER_INDEX_CACHE : 0);
if (n_indexes > 0) {
size_t max_cache = std::min(total_cache / 8, MAX_FILTER_INDEX_CACHE);
size_t max_cache = std::min(total_cache * 5 / 100, MAX_FILTER_INDEX_CACHE);
index_sizes.filter_index = max_cache / n_indexes;
total_cache -= index_sizes.filter_index * n_indexes;
}
total_cache -= index_sizes.tx_index;
total_cache -= index_sizes.txospender_index;
return {index_sizes, kernel::CacheSizes{total_cache}};
}