Revisiting latency numbers


“Back-of-the-envelop calculations”, “napkin-math”, “latency numbers every programmer should know” - yes, those numbers that usually come up during system design interview questions. This came into my periphery again while looking at RDMA latency checks and benchmarks with P4d instances in AWS (using SoftRoCE). As an old-timer with (most likely) outdated ideas about system design-related latency numbers, although I’m quite familiar with Jeff Dean’s “Numbers every one should know” approximations, I noticed that in a jiffy, I’m still (unconsciously) subscribed to the idea that disk access is most definitely faster than network.

Infra · Infra · Latency · System-Design

3 minutes