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## Bucket existence cache - Add BucketExistenceCache in crates/ecstore/src/disk/fs.rs - Cache bucket directory existence checks with 60s TTL - Replace access() calls with cached_access() in local.rs - Add invalidate_bucket_cache() for cache invalidation on create/delete - Reduces statx syscalls by 89% (from 10,716/s to 1,186/s) ## Allocator feature flags - Add mimalloc and jemalloc features to rustfs/Cargo.toml - Default: system allocator (Rust built-in) - --features mimalloc: mimalloc allocator - --features jemalloc: jemalloc allocator - Allows A/B testing different allocators ## Performance impact - 1KiB PUT: 861 obj/s (unchanged, futex is main bottleneck) - statx reduction: 89% (from 10,716/s to 1,186/s) - Main bottleneck remains mimalloc internal synchronization Ref: rustfs/backlog#2005 Ref: microsoft/mimalloc#1372 Co-authored-by: hector <hetor@rustfs.com> Co-authored-by: heihutu <heihutu@gmail.com> Co-authored-by: overtrue <anzhengchao@gmail.com>