Introducing MyPerf4J: A High‑Performance Java Monitoring and Statistics Tool

As companies scale their applications, traditional vertical architectures become insufficient, leading to service‑oriented development where engineers focus on individual services but encounter challenges such as unknown QPS, latency distribution, load balancing, and capacity planning.

To address these pain points, the article introduces MyPerf4J, a high‑performance Java performance monitoring and statistics tool designed for high‑concurrency, low‑latency applications.

Usage Scenarios

Quickly locate performance bottlenecks in development environments.

Continuously monitor performance indicators in production environments.

Key Features

High Performance: Single‑threaded support for up to 10 million records per second, each record costing only 73 ns.

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

Low Memory: Uses memory reuse to minimize temporary objects 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, including:

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 a JavaAgent, making it completely non‑intrusive.

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 .

Configuration

Add the following JVM startup parameters:

-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 :

MyPerf4J Method Metrics [2020-01-01 12:49:57, 2020-01-01 12:49:58]
Method[6]               Type        Level  TimePercent  RPS  Avg(ms)  Min(ms)  Max(ms)  StdDev  Count  TP50  TP90  TP95  TP99  TP999  TP9999
DemoServiceImpl.getId2(long)   General   Service   322.50%   6524   0.49   0   1   0.50   6524   0   1   1   1   1   1   1
...

Uninstall

Remove the two JVM parameters shown above and restart the JVM to unload the tool.

Open‑Source Repository

The project is hosted on GitHub: https://github.com/LinShunKang/MyPerf4J

For further reading, the article lists many related resources on microservice architecture, monitoring, and DDD.