https://bluuewhale.github.io/categories/systems/Recent content in Systems on Bluue Whalehttps://bluuewhale.github.io/images/profile.jpghttps://bluuewhale.github.io/images/profile.jpgHugo -- 0.152.2en-usTue, 25 Aug 2026 11:29:58 +0900https://bluuewhale.github.io/posts/debugging-false-sharing-en/Fri, 12 Dec 2025 10:52:00 +0900https://bluuewhale.github.io/posts/debugging-false-sharing-en/How Netflix tripled a service's CPU capacity, got only a 25% throughput gain, and traced the gap back to false sharing using hardware performance counters.https://bluuewhale.github.io/posts/spinlock-vs-mutex-en/Fri, 12 Dec 2025 10:20:40 +0900https://bluuewhale.github.io/posts/spinlock-vs-mutex-en/Why a userspace spinlock spinning on CAS and a kernel-backed mutex going through futex end up suited to different workloads, explained through cache coherence.