Nov 20, 2019 · Fundamentals

Deep Dive into System.currentTimeMillis(): Implementation, Performance, and Time Sources across Platforms

This article investigates the implementation of Java's System.currentTimeMillis() on Windows, macOS, and Linux, measures its execution speed, explores the underlying native methods and OS time‑source mechanisms such as TSC, HPET, and RTC, and discusses performance implications and best practices for high‑frequency timestamp retrieval.

ClockSourceLinuxSystem.currentTimeMillis

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Deep Dive into System.currentTimeMillis(): Implementation, Performance, and Time Sources across Platforms

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Dec 12, 2018 · Databases

Why Did Redis Slowlog Show 1800 ms Delays? Uncovering a Kernel Time‑Source Bug

During a Redis container migration, slowlog entries suddenly reported 1800 ms latency despite low QPS, leading to a deep investigation that traced the anomaly to a kernel bug affecting the Time Stamp Counter on Skylake‑X CPUs and improper use of gettimeofday for timing.

LinuxSlowlogcontainerization

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Why Did Redis Slowlog Show 1800 ms Delays? Uncovering a Kernel Time‑Source Bug

Deep Dive into System.currentTimeMillis(): Implementation, Performance, and Time Sources across Platforms

Why Did Redis Slowlog Show 1800 ms Delays? Uncovering a Kernel Time‑Source Bug

Why Did Redis Slowlog Show 1800 ms Delays? Uncovering a Kernel Time‑Source Bug