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9a3d57256a
Index caching was disabled by default because it caused performance regressions for some small-partition workloads. See https://github.com/scylladb/scylladb/issues/11202. However, it also means that there are workloads which could benefit from the index cache, but (by default) don't. As a compromise, we can set a default limit on the memory usage of index cache, which should be small enough to avoid catastrophic regressions in small-partition workloads, but big enough to accommodate workloads where index cache is obviously beneficial. This series adds such a configurable limit, sets it to to 0.2 of total cache memory by default, and re-enables index caching by default. Fixes #15118 Closes #14994 * github.com:scylladb/scylladb: test: boost/cache_algorithm_test: add cache_algorithm_test sstables: partition_index_cache: deglobalize stats utils: cached_file: deglobalize cached_file metrics db: config: enable index caching by default config: add index_cache_fraction utils: lru: add move semantics to list links