pluginagentmarketplace/custom-plugin-java/java-performance

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JVM performance tuning - GC optimization, profiling, memory analysis, benchmarking

Install

npx vskill@latest install pluginagentmarketplace/custom-plugin-java/java-performance

SKILL.md

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
bash
# 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
bash
# 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
java
@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

GCLatencyThroughputHeap Size
G1MediumHigh4-32GB
ZGCVery LowMedium8GB-16TB
ShenandoahVery LowMedium8GB+
ParallelHighVery HighAny

Troubleshooting

ProblemCauseSolution
GC thrashingHeap too smallIncrease heap
High latencyGC pausesSwitch to ZGC
Memory leakObject retentionHeap dump + MAT
CPU spikesHot loopsProfile + optimize

Usage

Skill("java-performance")

Security

  • Security scanPassed, 100 of 100Pattern checks on the skill's files.
  • Model reviewNot runA model review is scheduled for the next rescan.

See the full security report

Quality evaluation

  • Task evaluationNot runNo evaluation yet. Run one in Skill Studio.

See evaluation results

Source

Popularity

Repository stars
28
Repository forks
4
7-day trend score
17

Stars and forks are for the whole GitHub repository, not this skill alone. Refreshed 23 Mar 2026, 7 months ago.

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