// multi-utility computation suite · offline · instant · precise
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│ [c] calcalyst_ │
│ computation suite │
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dev.cache-hit-rate Calculator
Calculates cache hit rate from cache size, working set size, and access frequency distribution. For a Zipfian request distribution, 80% of requests hit 20% of items — a cache holding the top 20% of items achieves approximately 80% hit rate.
Inputs
Hits
Reference formula or conversion factor shown for context.
Total
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Miss Cost
Reference formula or conversion factor shown for context.
Hit Cost
Reference formula or conversion factor shown for context.
Results
cache hit rate
Fraction of requests served from cache without hitting the origin. Above 80-90% is generally good; below 50% means the cache is not effective.
avg latency with cache (ms)
Time from request initiation to response received. Composed of processing time, network round-trip, and queuing delay.
without cache (ms)
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.
speedup
Factor by which the improved approach outperforms the baseline. 2x speedup = half the original time.
misses per 1000 requests
Reference formula or conversion factor shown for context.
target
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