The author describes a deep dive into a Java issue where a shared TreeMap caused 3,200% CPU utilization due to an infinite loop. They provide practical experiments in Java, C#, and gRPC to reproduce the problem, highlighting the importance of handling uncaught exceptions in thread pools. They explore which programming languages can encounter this issue, finding that Java, Kotlin, C#, and C++ are affected. Surprisingly, C++ was able to reproduce the problem, contrary to initial expectations. The article offers unique insights into the impact of unguarded data structures on performance and provides practical examples and experiments to address the issue.
https://josephmate.github.io/2025-02-26-3200p-cpu-util/