Improving Request Latency in Java Applications with Profiling

2023/09/05

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The article discusses the challenges of identifying and resolving high response times in Java applications. It emphasizes the importance of using profiling tools to analyze and diagnose latency issues. The author introduces Datadog's Java wallclock profiler as a solution for improving request latency without making any code changes. The profiler focuses on identifying time spent off CPU, which can be a major contributor to latency problems. The article also mentions the use of Java Flight Recorder (JFR) as a built-in profiler in OpenJDK. It provides insights into how to interpret and analyze profiling data, such as flamegraphs and stack traces. The author highlights the need for context and understanding when mapping frames to code execution. Overall, the article offers valuable insights and recommendations for developers looking to optimize request latency in Java applications.