Java性能优化指南：JVM调优、GC优化、内存分析与基准测试

java-performance by pluginagentmarketplace/custom-plugin-java

218 周安装量

29 GitHub Stars

GitHub

安装命令

npx skills add https://github.com/pluginagentmarketplace/custom-plugin-java --skill java-performance

开发 JavaScript 框架性能优化

🇨🇳中文介绍

Java 性能优化技能

通过性能剖析、GC调优和内存分析来优化 JVM 性能。

概述

此技能涵盖 JVM 性能优化，包括垃圾回收调优、内存分析、CPU 性能剖析以及使用 JMH 进行基准测试。

使用场景

当您需要时使用此技能：

为低延迟或高吞吐量调优 GC
剖析 CPU 热点
分析内存泄漏
对代码性能进行基准测试
优化容器设置

快速参考

GC 预设配置

# High-throughput
-XX:+UseG1GC
-XX:MaxGCPauseMillis=200
-Xms4g -Xmx4g
-XX:+AlwaysPreTouch

# Low-latency
-XX:+UseZGC
-XX:+ZGenerational
-Xms8g -Xmx8g

# Memory-constrained
-XX:+UseSerialGC
-Xms512m -Xmx512m
-XX:+UseCompressedOops

# Container-optimized
-XX:+UseContainerSupport
-XX:MaxRAMPercentage=75.0
-XX:+ExitOnOutOfMemoryError

性能剖析命令

# Thread dump
jstack -l <pid> > threaddump.txt

# Heap dump
jmap -dump:format=b,file=heap.hprof <pid>

# GC analysis
jstat -gcutil <pid> 1000 10

# Flight recording
jcmd <pid> JFR.start duration=60s filename=app.jfr

# Async profiler
./profiler.sh -d 30 -f profile.html <pid>

JMH 基准测试示例

@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 3, time = 1)
@Measurement(iterations = 5, time = 1)
@State(Scope.Benchmark)
public class MyBenchmark {

    @Benchmark
    public void testMethod(Blackhole bh) {
        bh.consume(compute());
    }
}

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GC	延迟	吞吐量	堆大小
G1	中等	高	4-32GB
ZGC	极低	中等	8GB-16TB
Shenandoah	极低	中等	8GB+
Parallel	高	极高	任意

问题	原因	解决方案
GC 抖动	堆大小过小	增加堆大小
高延迟	GC 停顿	切换到 ZGC
内存泄漏	对象持有	堆转储 + MAT 分析
CPU 峰值	热点循环	性能剖析 + 优化

🇺🇸English

Java Performance Skill

Optimize JVM performance through profiling, GC tuning, and memory analysis.

Overview

This skill covers JVM performance optimization including garbage collection tuning, memory analysis, CPU profiling, and benchmarking with JMH.

When to Use This Skill

Use when you need to:

Tune GC for low latency or throughput
Profile CPU hotspots
Analyze memory leaks
Benchmark code performance
Optimize container settings

Quick Reference

GC Presets

# High-throughput
-XX:+UseG1GC
-XX:MaxGCPauseMillis=200
-Xms4g -Xmx4g
-XX:+AlwaysPreTouch

# Low-latency
-XX:+UseZGC
-XX:+ZGenerational
-Xms8g -Xmx8g

# Memory-constrained
-XX:+UseSerialGC
-Xms512m -Xmx512m
-XX:+UseCompressedOops

# Container-optimized
-XX:+UseContainerSupport
-XX:MaxRAMPercentage=75.0
-XX:+ExitOnOutOfMemoryError

Profiling Commands

# Thread dump
jstack -l <pid> > threaddump.txt

# Heap dump
jmap -dump:format=b,file=heap.hprof <pid>

# GC analysis
jstat -gcutil <pid> 1000 10

# Flight recording
jcmd <pid> JFR.start duration=60s filename=app.jfr

# Async profiler
./profiler.sh -d 30 -f profile.html <pid>

JMH Benchmark

@BenchmarkMode(Mode.Throughput)
@Warmup(iterations = 3, time = 1)
@Measurement(iterations = 5, time = 1)
@State(Scope.Benchmark)
public class MyBenchmark {

    @Benchmark
    public void testMethod(Blackhole bh) {
        bh.consume(compute());
    }
}

GC Comparison

GC	Latency	Throughput	Heap Size
G1	Medium	High	4-32GB
ZGC	Very Low	Medium	8GB-16TB
Shenandoah	Very Low	Medium	8GB+
Parallel	High	Very High	Any

Troubleshooting

Problem	Cause	Solution
GC thrashing	Heap too small	Increase heap
High latency	GC pauses	Switch to ZGC
Memory leak	Object retention	Heap dump + MAT
CPU spikes	Hot loops	Profile + optimize

Usage

Skill("java-performance")

Weekly Installs

197

Repository

pluginagentmark…gin-java

GitHub Stars

First Seen

Jan 21, 2026

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