MyPerf4J – High‑Performance Java Performance Monitoring and Statistics Tool

As the company grew, the original vertical architecture could no longer meet product demands; dozens of engineers working on a single project caused decreasing development efficiency.

To address this, the organization embarked on a service‑oriented transformation, which improved focus but introduced new challenges such as unknown service QPS, latency percentiles, slow‑response tracing, load balancing, and capacity planning.

To solve these problems, we introduce MyPerf4J, a high‑concurrency, low‑latency Java performance monitoring and statistics tool.

Usage Scenarios

Rapidly locate performance bottlenecks in a development environment.

Continuously monitor Java application performance metrics in production.

Features

High Performance: Single‑thread can record up to 10 million events per second, each record costing only 73 ns.

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

Low Memory Footprint: Uses object reuse to minimize temporary allocations and avoid GC impact.

High Precision: Measures response time in nanoseconds.

Real‑Time: Supports second‑level monitoring (minimum 1 s interval).

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 uses a JavaAgent for transparent integration without modifying application code.

Download

Download and unzip MyPerf4J-ASM.zip .

Read the extracted README file.

Modify MyPerf4J.properties to set app_name , metrics.log.xxx and filter.packages.include 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 will be written to /path/to/log/method_metrics.log .

Uninstall

Remove the two JVM arguments above and restart the JVM.

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

Open‑Source Repository

https://github.com/LinShunKang/MyPerf4J

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