LDB — Latency Debugging for Datacenter Applications

LDB is an efficient latency debugging tool for datacenter applications. Microsecond-scale services make it notoriously hard to answer the question “where did my tail latency come from?” — the overhead of conventional profilers distorts exactly the behavior being measured. LDB provides low-overhead, always-on latency tracing for multithreaded applications, making it practical to diagnose tail-latency problems in production-like settings.

See the NSDI ’24 paper below for the full design and evaluation.