Measure cache miss rate and the load that reaches the origin.
The cache miss rate is the share of total lookups that cache misses represents, expressed as a percentage. The same figure is also shown per 1,000 and as a "one in every N" odds statement, which is easier to reason about when the rate is very small. Absolute counts hide scale — a rate normalises the number so you can compare periods, channels or cohorts of different sizes, where lower is better.
Cache Miss Rate
Cache Miss Rate = Cache misses ÷ Total lookups × 100
Cache Miss Rate = Cache misses ÷ Total lookups × 100 The cache miss rate is the share of total lookups that cache misses represents, expressed as a percentage. The same figure is also shown per 1,000 and as a "one in every N" odds statement, which is easier to reason about when the rate is very small.
Absolute counts hide scale — a rate normalises the number so you can compare periods, channels or cohorts of different sizes, where lower is better.
This calculator takes 2 inputs: Cache misses, Total lookups. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.