3 / 5 Cache Patterns & Write Policies

Ninety Six Point Five

A read path serves 210,000 requests per second. Today the cache hit ratio is 96.5 percent. A quarter of tuning work raises it to 98.0 percent.

origin RPS=total RPS×(1−h)\text{origin RPS} = \text{total RPS} \times (1 - h)

By what percentage does origin load fall?

A

About 2 percent

B

About 43 percent

C

1.5 percent, the same as the improvement in hit ratio

D

About 57 percent