[draft] Add cache hit stats to CCoinsViewCache#8
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The coins cache (
CCoinsViewCache) caches part of the coins DB in memory for performance. It is crucial for validation performance during IBD, and (to a lesser extent) during steady state operation. The memory allocated to the cache is an important parameter, balanced between RAM usage and performance.An important metric of the coins cache is the cache hit/miss ratio. This PR attempts to measure exactly that.
Some explanations/observations:
CCoinsViewCacheacts as both a read cache and a write cacheCoinsTip()). When a new block is validated, a temporary overlay cache (CoinsViewOverlay) is created on top of the global cache. Cache statistics are enabled for the global cache. Many accesses (for inputs) are caught by the overlay cache, so those don't shown up in the stats (only their first access).The cache stats can be checked during raindex-chainstate:
Sample output (from Signet):
Including this in production code may be an overkill, there are several options: