Technologies/Redis/redis.mem.rss
RedisRedisMetric

redis.mem.rss

Redis RSS memory (bytes seen by OS)
Dimensions:None
Available on:DatadogDatadog (1)

Summary

Operating system reported resident set size in bytes — the actual physical memory occupied by the Redis process as seen by the OS. RSS is typically higher than used_memory due to memory fragmentation and allocator overhead. Large discrepancies (RSS >> used_memory) indicate fragmentation issues. RSS is what counts against system memory limits and cgroup quotas, making it critical for containerized deployments.

Interface Metrics (1)
DatadogDatadog
Redis RSS memory (bytes seen by OS)
Dimensions:None
Sources
redis.mem.rssdocs.datadoghq.com
Related Insights (1)
Memory Fragmentation Amplifies Cache Eviction Pressurewarning

High Redis memory fragmentation ratio (>1.5) causes actual memory usage to exceed redis.memory.maxmemory limits, triggering premature key evictions and reducing cache hit rates even when logical memory usage appears healthy.

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