Redis high cpu usage
Redis high cpu usage is typically caused by a compute-bound bottleneck where one or more processes are saturating CPU cores. Here is what to look for and what to do about it.
Common symptoms
- redis-server consistently tops CPU list
- cache response times increasing
- CPU spikes correlate with cache operations
Likely causes
- Evidence suggests: redis-server PID at 40%+ CPU sustained
- Evidence suggests: KEYS or SCAN commands running frequently
Evidence to look for
redis-server PID at 40%+ CPU sustained
KEYS or SCAN commands running frequently
large hash or sorted set operations detected
What it usually means
When CPU is the true bottleneck, the fix is usually profiling the hot path and reducing compute work. Scaling horizontally or vertically without profiling first is wasteful.
What to do next
- 1audit for expensive Redis commands (KEYS, SMEMBERS on large sets)
- 2enable Redis slowlog and review entries
- 3consider Redis Cluster for horizontal scaling
See what's causing your CPU
cpum.ai turns CPU, process, disk, and memory signals into plain-English explanations with evidence.
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