What is async-profiler and why use it for Java?

Async-profiler's a JVMTI agent for low-overhead CPU, alloc, and lock profiling. Outputs JFR, loads dynamically — perfect for prod without restarts.

How do you set up Coroot for Java lock contention profiling?

Set ENABLE_JAVA_ASYNC_PROFILER=true in the node agent env via Coroot CR. It auto-detects JVMs and starts profiling.

Does Coroot Java profiling work with existing agents like Datadog?

Yes — it scans /proc/maps and skips if async-profiler's already loaded, avoiding conflicts.

⚙️ DevOps & Platform Eng

Coroot Just Made Java Profiling Stupidly Easy — By Breaking Apps on Purpose

Everyone figured Java profiling meant JVM flags, restarts, or endless GC tweaks. Coroot flips the script: async-profiler slips in silently, catches memory leaks and lock wars, all proven by deliberately wrecking a demo app.

theAIcatchup Apr 09, 2026 4 min read

Coroot flamegraph revealing Java lock contention during chaos test

⚡ Key Takeaways

Coroot integrates async-profiler for smoothly Java memory and lock profiling with zero code changes. 𝕏
Proven by chaos demos: instantly spots lock contention and alloc spikes via flamegraphs. 𝕏
Exports Prometheus metrics for dashboards — real rates, not GC snapshots. 𝕏

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theAIcatchup

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#Coroot #Java profiling #async-profiler #lock contention

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Originally reported by dev.to

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