// multi-utility computation suite · offline · instant · precise
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cs.cache-hit-rate-impact Calculator
Calculates the effective average memory access time from cache hit rate, cache latency, and main memory latency using the weighted average formula. A 90% cache hit rate with 5ns cache and 100ns DRAM gives 14.5ns effective access — improving hit rate to 95% cuts that to 9.75ns.
Inputs
Hit Rate Pct
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Cache Latency Ms
Reference formula or conversion factor shown for context.
Db Latency Ms
Reference formula or conversion factor shown for context.
Requests Per Sec
Reference formula or conversion factor shown for context.
Results
avg response latency (ms)
Time from request initiation to response received. Composed of processing time, network round-trip, and queuing delay.
speedup vs no cache
Factor by which the improved approach outperforms the baseline. 2x speedup = half the original time.
DB requests per second
Sample size or count used in the calculation.
DB load reduction
Sample size or count used in the calculation.
cache misses per second
CAC (customer acquisition cost) -- total sales and marketing spend divided by new customers acquired. Healthy LTV:CAC ratio is 3:1 or higher.
P99 latency estimate
Time from request initiation to response received. Composed of processing time, network round-trip, and queuing delay.