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CPU Flame Graphs

brendangregg.com
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Time to Wow!

Time to Wow! (TtW) measures the time it takes for a customer to experience their first emotional “Wow” moment with your product or service…

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Make your QEMU 10 times faster with this one weird trick

NixOS uses virtual machines based on QEMU extensively for running its test suite. In order to avoid generating a disk image for every test, the test driver usually boots using a Plan 9 File Protocol (9p) share (server implemented by QEMU) for the Nix store, which contains all the programs...

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Inspecting OpenJDK performance on Linux using perf

Analyzing performance can be challenging, especially when diagnosing regressions. Finding the right methods to investigate performance issues is often time-consuming and complex. You may have heard of perf, a powerful Linux tool for performance measurement, available from the kernel. This post will guide you through using perf to analyze performance on Linux, serving as a practical “quick start” guide for those new to profiling Java applications with perf. It’s not meant to be a comprehensive tutorial, as many of those already exist in the extensive documentation of perf and other excellent sources. However, the examples provided may be all you need or, at the very least, give you an idea of where to look for deeper insights.

The story of one latency spike

A customer reported an unusual problem with our CloudFlare CDN: our servers were responding to some HTTP requests slowly. Extremely slowly. 30 seconds slowly.

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