Seven Methods for Precisely Wasting CPU Time in Java Profiling Tests
By
tanelpoder
Front-window bakery material. Catches the eye, delivers the goods.
Summary
This technical blog post explores seven different methods to intentionally waste specific amounts of CPU time for testing purposes, particularly in the context of profiling Java applications. The author builds on previous work with CPU-time profilers and demonstrates various approaches to consume precise CPU cycles, ranging from simple loops to more sophisticated techniques involving mathematical operations and system calls.
Key quotes
· 4 pulledWelcome back to my blog. Last week, I showed you how to profile your Cloudfoundry application, and the week before, how I made the CPU-time profiler a tiny bit better by removing redundant synchronization.
This week's blog post will be closer to the latter, trying to properly waste CPU.
As a short backstory, my profiler needed a test to check that the queue size of the sampler really increased dynamically, so I needed a way to let a thread spend a pre-defined amount of CPU-time.
In this week's blog post, you'll learn seven different ways to waste a specific amount of CPU-time.
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