Boost Java Performance with MyPerf4J: High‑Throughput, Low‑Latency Monitoring

As the company's services grew, the original vertical architecture couldn't meet product development, and parallel development by dozens of engineers reduced efficiency.

The company thus pushed a service-oriented approach, allowing each engineer to focus on their own sub‑project, improving efficiency but introducing new challenges such as monitoring service QPS, latency percentiles, identifying slow methods, load balancing, and diagnosing issues across DB, cache, or downstream services.

Use Cases

Quickly locate performance bottlenecks in Java applications during development.

Continuously monitor performance metrics of Java applications in production.

Features

High Performance: Single‑threaded recording of up to 10 million responses per second, each record costing only 73 ns.

Non‑intrusive: Implemented via JavaAgent, requiring no code changes.

Low Memory: Uses object reuse to generate minimal temporary objects, avoiding GC impact.

High Precision: Measures response time in nanoseconds.

Real‑time: Supports second‑level monitoring, minimum interval 1 s.

Monitoring Metrics

MyPerf4J collects dozens of real‑time metrics for each application.

Method

RPS, Count, Avg, Min, Max, StdDev, TP50, TP90, TP95, TP99, TP999, TP9999, TP99999, TP100

Memory

HeapInit, HeapUsed, HeapCommitted, HeapMax, NonHeapInit, NonHeapUsed, NonHeapCommitted, NonHeapMax

JVM GC

CollectCount, CollectTime

JVM Class

Total, Loaded, Unloaded

Quick Start

MyPerf4J is integrated via JavaAgent, requiring no code modifications.

Download

Download and unzip MyPerf4J-ASM.zip.

Read the README file.

Modify app_name, metrics.log.xxx and filter.packages.include in MyPerf4J.properties as needed.

Configuration

Add the following JVM arguments:

-javaagent:/path/to/MyPerf4J-ASM.jar
-DMyPerf4JPropFile=/path/to/MyPerf4J.properties

Run

Start the application; monitoring logs are written to /path/to/log/method_metrics.log.

Uninstall

Remove the two JavaAgent arguments from the JVM startup parameters and restart.

-javaagent:/path/to/MyPerf4J-ASM.jar
-DMyPerf4JPropFile=/path/to/MyPerf4J.properties

Open‑source repository: https://github.com/LinShunKang/MyPerf4J