Redis 8.0 Async io-threads & Linux Kernel Tuning (redis.conf)

# Redis 8.0+ High-Throughput Production Configuration (/etc/redis/redis.conf) # Prerequisite Linux sysctl (/etc/sysctl.d/99-redis.conf): # vm.overcommit_memory = 1 # net.core.somaxconn = 65535 bind 127.0.0.1 -::1 protected-mode yes port 6379 tcp-backlog 65535 tcp-keepalive 300 timeout 0 # 1. Redis 8.0 Redesigned Asynchronous Multi-Core I/O Engine # Offloads socket reads, RESP parsing, and reply writes across cores (set to ~60-75% of physical cores, max 8-12) io-threads 8 # 2. Memory Ceiling & Non-Blocking Lazy Eviction maxmemory 16gb maxmemory-policy allkeys-lfu maxmemory-samples 10 lazyfree-lazy-eviction yes lazyfree-lazy-expire yes lazyfree-lazy-server-del yes replica-lazy-flush yes lazyfree-lazy-user-del yes lazyfree-lazy-user-flush yes # 3. Online Jemalloc Active Defragmentation (Prevents RSS bloat on variable-sized payloads) activedefrag yes active-defrag-ignore-bytes 256mb active-defrag-threshold-lower 10 active-defrag-threshold-upper 100 active-defrag-cycle-min 1 active-defrag-cycle-max 25 # 4. Hybrid RDB + AOF Persistence & Latency Monitor appendonly yes appendfsync everysec aof-use-rdb-preamble yes no-appendfsync-on-rewrite yes latency-monitor-threshold 5 slowlog-log-slower-than 2000 slowlog-max-len 512